//! This function is the generic control pipe management function.
//! This function is used to send and receive control requests over control pipe.
//!
//! @todo Fix all time-out errors and disconnections in active wait loop.
//!
//! @param data_pointer void *: Pointer to data to transfer
//!
//! @return Status_t: Status
//!
//! @note This function uses the usb_request global structure. Hence, this
//! structure should be filled before calling this function.
//!
Status_t host_transfer_control(void *data_pointer)
{
int status = CONTROL_GOOD;
bool sav_int_sof_enable;
bool sav_glob_int_en;
uint16_t data_length;
uint8_t c;
Usb_ack_event(EVT_HOST_SOF);
sav_int_sof_enable = Is_host_sof_interrupt_enabled();
Host_enable_sof_interrupt(); // SOF software detection is in interrupt subroutine
while (!Is_usb_event(EVT_HOST_SOF)) // Wait 1 SOF
{
#if defined(Host_wait_action)
Host_wait_action();
#endif
if (Is_host_emergency_exit())
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
}
Host_configure_pipe_token(P_CONTROL, TOKEN_SETUP);
Host_ack_setup_ready();
Host_unfreeze_pipe(P_CONTROL);
// Build and send the setup request fields
Host_reset_pipe_fifo_access(P_CONTROL);
Host_write_pipe_data(P_CONTROL, 8, usb_request.bmRequestType);
Host_write_pipe_data(P_CONTROL, 8, usb_request.bRequest);
Host_write_pipe_data(P_CONTROL, 16, usb_format_mcu_to_usb_data(16, usb_request.wValue));
Host_write_pipe_data(P_CONTROL, 16, usb_format_mcu_to_usb_data(16, usb_request.wIndex));
Host_write_pipe_data(P_CONTROL, 16, usb_format_mcu_to_usb_data(16, usb_request.wLength));
Host_send_setup();
while (!Is_host_setup_ready()) // Wait for SETUP ack
{
#if defined(Host_wait_action)
Host_wait_action();
#endif
if (Is_host_emergency_exit())
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
if (Is_host_pipe_error(P_CONTROL)) // Any error?
{
c = Host_error_status(P_CONTROL);
Host_ack_all_errors(P_CONTROL);
status = c; // Send error status
goto host_transfer_control_end;
}
}
// Setup token sent; now send IN or OUT token
// Before just wait 1 SOF
Usb_ack_event(EVT_HOST_SOF);
Host_freeze_pipe(P_CONTROL);
data_length = usb_request.wLength;
while (!Is_usb_event(EVT_HOST_SOF)) // Wait 1 SOF
{
#if defined(Host_wait_action)
Host_wait_action();
#endif
if (Is_host_emergency_exit())
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
}
// IN request management ---------------------------------------------
if (usb_request.bmRequestType & 0x80) // Data stage IN (bmRequestType.D7 == 1)
{
Host_disable_continuous_in_mode(P_CONTROL);
Host_configure_pipe_token(P_CONTROL, TOKEN_IN);
Host_ack_control_in_received_free();
while (data_length)
{
Host_unfreeze_pipe(P_CONTROL);
private_sof_counter = 0; // Reset the counter in SOF detection subroutine
while (!Is_host_control_in_received())
{
#if defined(Host_wait_action)
Host_wait_action();
#endif
if (Is_host_emergency_exit())
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
if (Is_host_pipe_error(P_CONTROL)) // Any error?
{
c = Host_error_status(P_CONTROL);
Host_ack_all_errors(P_CONTROL);
status = c; // Send error status
goto host_transfer_control_end;
}
if (Is_host_stall(P_CONTROL))
{
Host_ack_stall(P_CONTROL);
status = CONTROL_STALL;
goto host_transfer_control_end;
}
#if TIMEOUT_DELAY_ENABLE == ENABLE
if (1000 < host_get_timeout()) // Count 1s
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
#endif
}
Host_reset_pipe_fifo_access(P_CONTROL);
c = Host_get_pipe_size(P_CONTROL) - Host_byte_count(P_CONTROL);
data_length = host_read_p_rxpacket(P_CONTROL, data_pointer, data_length, &data_pointer);
if (usb_request.incomplete_read || c) data_length = 0;
Host_freeze_pipe(P_CONTROL);
Host_ack_control_in_received_free();
// In low-speed mode, the USB IP may have not yet sent the ACK at this
// point. The USB IP does not support a new start of transaction request
// from the firmware if the ACK has not been sent. The only means of
// making sure the ACK has been sent is to wait for the next Keep-Alive
// before starting a new transaction.
if (Is_usb_low_speed_mode())
{
Usb_ack_event(EVT_HOST_SOF);
if ((sav_glob_int_en = cpu_irq_is_enabled())) cpu_irq_disable();
Host_ack_sof();
(void)Is_host_sof_interrupt_enabled();
if (sav_glob_int_en) cpu_irq_enable();
while (!Is_usb_event(EVT_HOST_SOF)) // Wait for next Keep-Alive
{
if (Is_host_emergency_exit())
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
}
}
} // End of IN data stage
Host_configure_pipe_token(P_CONTROL, TOKEN_OUT);
Host_ack_control_out_ready_send();
Host_unfreeze_pipe(P_CONTROL);
#if TIMEOUT_DELAY_ENABLE == ENABLE
private_sof_counter = 0; // Reset the counter in SOF detection subroutine
#endif
while (!Is_host_control_out_ready())
{
#if defined(Host_wait_action)
Host_wait_action();
#endif
if (Is_host_emergency_exit())
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
if (Is_host_pipe_error(P_CONTROL)) // Any error?
{
c = Host_error_status(P_CONTROL);
Host_ack_all_errors(P_CONTROL);
status = c; // Send error status
goto host_transfer_control_end;
}
if (Is_host_stall(P_CONTROL))
{
Host_ack_stall(P_CONTROL);
status = CONTROL_STALL;
goto host_transfer_control_end;
}
#if TIMEOUT_DELAY_ENABLE == ENABLE
if (2000 < host_get_timeout()) // Count 2s
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
#endif
}
Host_ack_control_out_ready();
}
// OUT request management --------------------------------------------
else // Data stage OUT (bmRequestType.D7 == 0)
{
Host_configure_pipe_token(P_CONTROL, TOKEN_OUT);
Host_ack_control_out_ready();
while (data_length)
{
Host_unfreeze_pipe(P_CONTROL);
Host_reset_pipe_fifo_access(P_CONTROL);
data_length = host_write_p_txpacket(P_CONTROL, data_pointer, data_length, (const void **)&data_pointer);
Host_send_control_out();
while (!Is_host_control_out_ready())
{
#if defined(Host_wait_action)
Host_wait_action();
#endif
if (Is_host_emergency_exit())
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
if (Is_host_pipe_error(P_CONTROL)) // Any error?
{
c = Host_error_status(P_CONTROL);
Host_ack_all_errors(P_CONTROL);
status = c; // Send error status
goto host_transfer_control_end;
}
if (Is_host_stall(P_CONTROL))
{
Host_ack_stall(P_CONTROL);
status = CONTROL_STALL;
goto host_transfer_control_end;
}
}
Host_ack_control_out_ready();
} // End of OUT data stage
Host_freeze_pipe(P_CONTROL);
Host_configure_pipe_token(P_CONTROL, TOKEN_IN);
Host_ack_control_in_received_free();
Host_unfreeze_pipe(P_CONTROL);
#if TIMEOUT_DELAY_ENABLE == ENABLE
private_sof_counter = 0; // Reset the counter in SOF detection subroutine
#endif
while (!Is_host_control_in_received())
{
#if defined(Host_wait_action)
Host_wait_action();
#endif
if (Is_host_emergency_exit())
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
if (Is_host_pipe_error(P_CONTROL)) // Any error?
{
c = Host_error_status(P_CONTROL);
Host_ack_all_errors(P_CONTROL);
status = c; // Send error status
goto host_transfer_control_end;
}
if (Is_host_stall(P_CONTROL))
{
Host_ack_stall(P_CONTROL);
status = CONTROL_STALL;
goto host_transfer_control_end;
}
#if TIMEOUT_DELAY_ENABLE == ENABLE
if (2000 < host_get_timeout()) // Count 2s
{
Host_freeze_pipe(P_CONTROL);
Host_reset_pipe(P_CONTROL);
status = CONTROL_TIMEOUT;
goto host_transfer_control_end;
}
#endif
}
Host_ack_control_in_received();
Host_freeze_pipe(P_CONTROL);
Host_free_control_in();
}
host_transfer_control_end:
if (!sav_int_sof_enable) // Restore SOF interrupt enable
{
if ((sav_glob_int_en = cpu_irq_is_enabled())) cpu_irq_disable();
Host_disable_sof_interrupt();
(void)Is_host_sof_interrupt_enabled();
if (sav_glob_int_en) cpu_irq_enable();
}
return status;
}
//!
//! @brief This function receives nb_data bytes pointed to by ptr_buf on the specified pipe.
//!
//! *nb_data is updated with the final number of data bytes received.
//!
//! @note This function activates the host SOF interrupt to detect time-outs.
//! The initial enable state of this interrupt will be restored.
//!
//! @param pipe
//! @param nb_data
//! @param ptr_buf
//!
//! @return Status_t: Pipe status
//!
Status_t host_get_data(uint8_t pipe, uint16_t *nb_data, void *ptr_buf)
{
Status_t status = PIPE_GOOD; // Frame correctly received by default
bool sav_int_sof_enable;
bool sav_glob_int_en;
uint8_t nak_timeout;
uint16_t n, i;
#if NAK_TIMEOUT_ENABLE == ENABLE
uint16_t cpt_nak;
#endif
n = *nb_data;
sav_int_sof_enable = Is_host_sof_interrupt_enabled();
Host_enable_sof_interrupt();
Host_enable_continuous_in_mode(pipe);
Host_configure_pipe_token(pipe, TOKEN_IN);
Host_ack_in_received(pipe);
while (n) // While missing data...
{
Host_free_in(pipe);
Host_unfreeze_pipe(pipe);
private_sof_counter = 0; // Reset the counter in SOF detection subroutine
nak_timeout = 0;
#if NAK_TIMEOUT_ENABLE == ENABLE
cpt_nak = 0;
#endif
while (!Is_host_in_received(pipe))
{
if (Is_host_emergency_exit()) // Asynchronous disconnection or role exchange detected under interrupt
{
status = PIPE_DELAY_TIMEOUT;
Host_reset_pipe(pipe);
goto host_get_data_end;
}
#if TIMEOUT_DELAY_ENABLE == ENABLE
if (private_sof_counter >= 250) // Time-out management
{
private_sof_counter = 0; // Done in host SOF interrupt
if (nak_timeout++ >= TIMEOUT_DELAY) // Check for local time-out
{
status = PIPE_DELAY_TIMEOUT;
Host_reset_pipe(pipe);
goto host_get_data_end;
}
}
#endif
if (Is_host_pipe_error(pipe)) // Error management
{
status = Host_error_status(pipe);
Host_ack_all_errors(pipe);
goto host_get_data_end;
}
if (Is_host_stall(pipe)) // STALL management
{
status = PIPE_STALL;
Host_reset_pipe(pipe);
Host_ack_stall(pipe);
goto host_get_data_end;
}
#if NAK_TIMEOUT_ENABLE == ENABLE
if (Is_host_nak_received(pipe)) // NAK received
{
Host_ack_nak_received(pipe);
if (cpt_nak++ > NAK_RECEIVE_TIMEOUT)
{
status = PIPE_NAK_TIMEOUT;
Host_reset_pipe(pipe);
goto host_get_data_end;
}
}
#endif
}
Host_freeze_pipe(pipe);
Host_reset_pipe_fifo_access(pipe);
i = Host_get_pipe_size(pipe) - Host_byte_count(pipe);
if (!ptr_buf)
{
if (Host_byte_count(pipe) > n) // More bytes received than expected
{
n = 0;
//! @todo Error code management
}
else // Nb bytes received <= expected
{
n -= Host_byte_count(pipe);
if (i) // Short packet
{
*nb_data -= n;
n = 0;
}
}
}
else
{
n = host_read_p_rxpacket(pipe, ptr_buf, n, &ptr_buf);
if (Host_byte_count(pipe)) // More bytes received than expected
{
//! @todo Error code management
}
else if (i) // Short packet with nb bytes received <= expected
{
*nb_data -= n;
n = 0;
}
}
Host_ack_in_received(pipe);
// In low-speed mode, the USB IP may have not yet sent the ACK at this
// point. The USB IP does not support a new start of transaction request
// from the firmware if the ACK has not been sent. The only means of making
// sure the ACK has been sent is to wait for the next Keep-Alive before
// starting a new transaction.
if (Is_usb_low_speed_mode())
{
Usb_ack_event(EVT_HOST_SOF);
sav_int_sof_enable = Is_host_sof_interrupt_enabled();
if ((sav_glob_int_en = cpu_irq_is_enabled())) cpu_irq_disable();
Host_ack_sof();
(void)Is_host_sof_interrupt_enabled();
if (sav_glob_int_en) cpu_irq_enable();
Host_enable_sof_interrupt();
while (!Is_usb_event(EVT_HOST_SOF)) // Wait for next Keep-Alive
{
if (Is_host_emergency_exit())
{
status = PIPE_DELAY_TIMEOUT;
Host_reset_pipe(pipe);
goto host_get_data_end;
}
}
if (!sav_int_sof_enable) // Restore SOF interrupt enable
{
if ((sav_glob_int_en = cpu_irq_is_enabled())) cpu_irq_disable();
Host_disable_sof_interrupt();
(void)Is_host_sof_interrupt_enabled();
if (sav_glob_int_en) cpu_irq_enable();
}
}
}
host_get_data_end:
Host_freeze_pipe(pipe);
// Restore SOF interrupt enable state
if (!sav_int_sof_enable)
{
if ((sav_glob_int_en = cpu_irq_is_enabled())) cpu_irq_disable();
Host_disable_sof_interrupt();
(void)Is_host_sof_interrupt_enabled();
if (sav_glob_int_en) cpu_irq_enable();
}
// And return...
return status;
}
void usb_host_task(void)
#endif
{
#define DEVICE_DEFAULT_MAX_ERROR_COUNT 2
static uint8_t device_default_error_count;
#ifdef HOST_VBUS_LOW_TIMEOUT
extern t_cpu_time timer_vbus_low;
#endif
static bool sav_int_sof_enable;
uint8_t pipe;
#ifdef FREERTOS_USED
portTickType xLastWakeTime;
xLastWakeTime = xTaskGetTickCount();
while (true)
{
vTaskDelayUntil(&xLastWakeTime, configTSK_USB_HST_PERIOD);
#endif // FREERTOS_USED
switch (device_state)
{
#ifdef HOST_VBUS_LOW_TIMEOUT
case DEVICE_VBUS_LOW:
Usb_disable_vbus();
if (cpu_is_timeout(&timer_vbus_low))
usb_host_task_init();
break;
#endif
//------------------------------------------------------
// DEVICE_UNATTACHED state
//
// - Default init state
// - Try to give device power supply
//
case DEVICE_UNATTACHED:
device_default_error_count = 0;
nb_interface_supported = 0;
Host_clear_device_status(); // Reset device status
Usb_clear_all_event(); // Clear all software events
Host_disable_sof();
host_disable_all_pipes();
Usb_enable_vbus(); // Give at least device power supply!
// If VBus OK, wait for device connection
if (Is_usb_vbus_high())
device_state = DEVICE_ATTACHED;
break;
//------------------------------------------------------
// DEVICE_ATTACHED state
//
// - VBus is on
// - Try to detect device connection
//
case DEVICE_ATTACHED:
if (Is_host_device_connection() || Is_usb_event(EVT_HOST_CONNECTION) ) // Device pull-up detected
{
device_attached_retry:
if( Is_usb_event(EVT_HOST_CONNECTION) ) {
Usb_ack_event(EVT_HOST_CONNECTION);
}
Usb_ack_bconnection_error_interrupt();
Usb_ack_vbus_error_interrupt();
Host_ack_device_connection();
Host_clear_device_status(); // Reset device status
cpu_irq_disable();
Host_disable_device_disconnection_interrupt();
Host_send_reset(); // First USB reset
(void)Is_host_sending_reset();
cpu_irq_enable();
Usb_ack_event(EVT_HOST_SOF);
// Active wait for end of reset send
while (Is_host_sending_reset())
{
// The USB macro does not signal the end of reset when a disconnection occurs
if (Is_host_device_disconnection())
{
// Stop sending USB reset
Host_stop_sending_reset();
}
}
Host_ack_reset_sent();
Host_enable_sof(); // Start SOF generation
Host_enable_sof_interrupt(); // SOF will be detected under interrupt
if (!Is_host_device_disconnection())
{
// Workaround for some buggy devices with powerless pull-up
// usually low-speed where data line rises slowly and can be interpreted as disconnection
for (sof_cnt = 0; sof_cnt < 0xFFFF; sof_cnt++) // Basic time-out counter
{
// If we detect SOF, device is still alive and connected, just clear false disconnect flag
if (Is_usb_event(EVT_HOST_SOF) && Is_host_device_disconnection())
{
Host_ack_device_connection();
Host_ack_device_disconnection();
break;
}
}
}
Host_enable_device_disconnection_interrupt();
sof_cnt = 0;
while (sof_cnt < 100) // Wait 100 ms after USB reset
{
if (Is_usb_event(EVT_HOST_SOF)) Usb_ack_event(EVT_HOST_SOF), sof_cnt++; // Count SOFs
if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) goto device_attached_error;
}
device_state = DEVICE_POWERED;
LOG_STR(log_device_connected);
Host_device_connection_action();
sof_cnt = 0;
}
device_attached_error:
// Device connection error, or VBus pb -> Retry the connection process from the beginning
if (Is_usb_bconnection_error_interrupt() || Is_usb_vbus_error_interrupt() || Is_usb_vbus_low())
{
if (device_state != DEVICE_VBUS_LOW)
device_state = DEVICE_UNATTACHED;
Usb_ack_bconnection_error_interrupt();
Usb_ack_vbus_error_interrupt();
Host_disable_sof();
}
break;
//------------------------------------------------------
// DEVICE_POWERED state
//
// - Device connection (attach) has been detected,
// - Wait 100 ms and configure default control pipe
//
case DEVICE_POWERED:
if (Is_usb_event(EVT_HOST_SOF))
{
Usb_ack_event(EVT_HOST_SOF);
if (sof_cnt++ >= 100) // Wait 100 ms
{
Host_enable_pipe(P_CONTROL);
(void)Host_configure_pipe(P_CONTROL,
0,
EP_CONTROL,
TYPE_CONTROL,
TOKEN_SETUP,
8,
SINGLE_BANK);
device_state = DEVICE_DEFAULT;
}
}
break;
//------------------------------------------------------
// DEVICE_DEFAULT state
//
// - Get device descriptor
// - Reconfigure control pipe according to device control endpoint
// - Assign device address
//
case DEVICE_DEFAULT:
// Get first device descriptor
if (host_get_device_descriptor_incomplete() == CONTROL_GOOD)
{
sof_cnt = 0;
while (sof_cnt < 20) // Wait 20 ms before USB reset (special buggy devices...)
{
if (Is_usb_event(EVT_HOST_SOF)) Usb_ack_event(EVT_HOST_SOF), sof_cnt++;
if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) break;
}
cpu_irq_disable();
Host_disable_device_disconnection_interrupt();
Host_send_reset(); // First USB reset
(void)Is_host_sending_reset();
cpu_irq_enable();
Usb_ack_event(EVT_HOST_SOF);
// Active wait for end of reset send
while (Is_host_sending_reset())
{
// The USB macro does not signal the end of reset when a disconnection occurs
if (Is_host_device_disconnection())
{
// Stop sending USB reset
Host_stop_sending_reset();
}
}
Host_ack_reset_sent();
if (!Is_host_device_disconnection())
{
// Workaround for some buggy devices with powerless pull-up
// usually low-speed where data line rises slowly and can be interpreted as disconnection
for (sof_cnt = 0; sof_cnt < 0xFFFF; sof_cnt++) // Basic time-out counter
{
// If we detect SOF, device is still alive and connected, just clear false disconnect flag
if (Is_usb_event(EVT_HOST_SOF) && Is_host_device_disconnection())
{
Host_ack_device_connection();
Host_ack_device_disconnection();
break;
}
}
}
Host_enable_device_disconnection_interrupt();
sof_cnt = 0;
while (sof_cnt < 200) // Wait 200 ms after USB reset
{
if (Is_usb_event(EVT_HOST_SOF)) Usb_ack_event(EVT_HOST_SOF), sof_cnt++;
if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) break;
}
Host_disable_pipe(P_CONTROL);
Host_unallocate_memory(P_CONTROL);
Host_enable_pipe(P_CONTROL);
// Reconfigure the control pipe according to the device control endpoint
(void)Host_configure_pipe(P_CONTROL,
0,
EP_CONTROL,
TYPE_CONTROL,
TOKEN_SETUP,
data_stage[OFFSET_FIELD_MAXPACKETSIZE],
SINGLE_BANK);
// Give an absolute device address
if (host_set_address(DEVICE_ADDRESS) == CONTROL_GOOD)
{
for (pipe = 0; pipe < MAX_PEP_NB; pipe++)
Host_configure_address(pipe, DEVICE_ADDRESS);
device_state = DEVICE_ADDRESSED;
}
else if (device_state != DEVICE_VBUS_LOW)
device_state = DEVICE_ERROR;
}
else
{
if (device_state != DEVICE_VBUS_LOW)
{
if (++device_default_error_count > DEVICE_DEFAULT_MAX_ERROR_COUNT)
device_state = DEVICE_ERROR;
else
{
Host_disable_sof();
Host_disable_pipe(P_CONTROL);
Host_unallocate_memory(P_CONTROL);
device_state = DEVICE_ATTACHED;
goto device_attached_retry;
}
}
Usb_ack_bconnection_error_interrupt();
Usb_ack_vbus_error_interrupt();
Host_disable_sof();
}
break;
//------------------------------------------------------
// DEVICE_ADDRESSED state
//
// - Check if VID PID is in supported list
//
case DEVICE_ADDRESSED:
if (host_get_device_descriptor() == CONTROL_GOOD)
{
// Detect if the device connected belongs to the supported devices table
if (host_check_VID_PID())
{
Host_set_device_supported();
Host_device_supported_action();
device_state = DEVICE_CONFIGURED;
}
else
{
#if HOST_STRICT_VID_PID_TABLE == ENABLE
device_state = DEVICE_ERROR;
LOG_STR(log_unsupported_device);
#else
device_state = DEVICE_CONFIGURED;
#endif
Host_device_not_supported_action();
}
}
else if (device_state != DEVICE_VBUS_LOW)
device_state = DEVICE_ERROR; // Can not get device descriptor
break;
//------------------------------------------------------
// DEVICE_CONFIGURED state
//
// - Configure pipes for the supported interface
// - Send Set_configuration() request
// - Go to full operating mode (device ready)
//
case DEVICE_CONFIGURED:
{
uint8_t configuration_index = 0;
if (host_get_configuration_descriptor(configuration_index) == CONTROL_GOOD)
{
if (host_check_class()) // Class support OK?
{
#if HOST_AUTO_CFG_ENDPOINT == DISABLE
User_configure_endpoint(); // User call here instead of autoconfig
Host_set_configured(); // Assumes config is OK with user config
#endif
if (Is_host_configured())
{
if (host_set_configuration(data_stage[OFFSET_FIELD_CONFIGURATION_NB]) == CONTROL_GOOD) // Send Set_configuration
{
// Device and host are now fully configured
// go to DEVICE_READY normal operation
device_state = DEVICE_READY;
// Monitor device disconnection under interrupt
Host_enable_device_disconnection_interrupt();
// If user host application requires SOF interrupt event
// Keep SOF interrupt enabled, otherwise disable this interrupt
#if HOST_CONTINUOUS_SOF_INTERRUPT == DISABLE
cpu_irq_disable();
Host_disable_sof_interrupt();
(void)Is_host_sof_interrupt_enabled();
cpu_irq_enable();
#endif
Host_new_device_connection_action();
cpu_irq_enable();
LOG_STR(log_device_enumerated);
}
else if (device_state != DEVICE_VBUS_LOW)
device_state = DEVICE_ERROR; // Problem during Set_configuration request...
}
}
else // Device class not supported...
{
device_state = DEVICE_UNSUPPORTED;
LOG_STR(log_unsupported_device);
Host_device_class_not_supported_action();
}
}
else if (device_state != DEVICE_VBUS_LOW)
device_state = DEVICE_ERROR; // Can not get configuration descriptors...
}
break;
//------------------------------------------------------
// DEVICE_READY state
//
// - Full standard operating mode
// - Nothing to do...
//
case DEVICE_READY: // Host full standard operating mode!
break;
//------------------------------------------------------
// DEVICE_UNSUPPORTED state
//
case DEVICE_UNSUPPORTED:
break;
//------------------------------------------------------
// DEVICE_ERROR state
//
// - Error state
// - Do custom action call (probably go to default mode...)
//
case DEVICE_ERROR: //! @todo
#if HOST_ERROR_RESTART == ENABLE
device_state = DEVICE_UNATTACHED;
#endif
Host_device_error_action();
break;
//------------------------------------------------------
// DEVICE_SUSPENDED state
//
// - Host application request to suspend the device activity
// - State machine comes here thanks to Host_request_suspend()
//
case DEVICE_SUSPENDED:
if (Is_device_supports_remote_wakeup()) // If the connected device supports remote wake-up
{
host_set_feature_remote_wakeup(); // Enable this feature...
}
LOG_STR(log_usb_suspended);
sav_int_sof_enable = Is_host_sof_interrupt_enabled(); //Save current SOF interrupt enable state
cpu_irq_disable();
Host_disable_sof_interrupt();
(void)Is_host_sof_interrupt_enabled();
cpu_irq_enable();
Host_ack_sof();
Host_disable_sof(); // Stop SOF generation, this generates the suspend state
Host_ack_hwup();
Host_enable_hwup_interrupt(); // Enable host wake-up interrupt
// (this is the unique USB interrupt able to wake up the CPU core from power-down mode)
(void)Is_host_hwup_interrupt_enabled(); // Make sure host wake-up interrupt is enabled
Usb_freeze_clock();
//! @todo Implement this on the silicon version
//Stop_pll();
Host_suspend_action(); // Custom action here! (e.g. go to power-save mode...)
device_state = DEVICE_WAIT_RESUME; // Wait for device resume event
break;
//------------------------------------------------------
// DEVICE_WAIT_RESUME state
//
// Wait in this state till:
// - the host receives an upstream resume from the device
// - or the host software request the device to resume
//
case DEVICE_WAIT_RESUME:
if (Is_usb_event(EVT_HOST_HWUP) || Is_host_request_resume()) // Remote wake-up has been detected
// or local resume request has been received
{
if (Is_host_request_resume()) // Not a remote wake-up, but a host application request
{
// CAUTION: HWUP can be cleared only when USB clock is active
//! @todo Implement this on the silicon version
//Pll_start_auto(); // First Restart the PLL for USB operation
//Wait_pll_ready(); // Make sure PLL is locked
Usb_unfreeze_clock(); // Enable clock on USB interface
(void)Is_usb_clock_frozen(); // Make sure USB interface clock is enabled
cpu_irq_disable();
Host_disable_hwup_interrupt(); // Wake-up interrupt should be disabled as host is now awoken!
(void)Is_host_hwup_interrupt_enabled();
cpu_irq_enable();
Host_ack_hwup(); // Clear HWUP interrupt flag
}
Host_enable_sof();
Host_send_resume(); // Send downstream resume
while (!Is_host_down_stream_resume()); // Wait for downstream resume sent
Host_ack_remote_wakeup(); // Ack remote wake-up reception
Host_ack_request_resume(); // Ack software request
Host_ack_down_stream_resume(); // Ack downstream resume sent
Usb_ack_event(EVT_HOST_HWUP); // Ack software event
if (sav_int_sof_enable) Host_enable_sof_interrupt(); // Restore SOF interrupt enable state before suspend
device_state = DEVICE_READY; // Come back to full operating mode
LOG_STR(log_usb_resumed);
}
break;
//------------------------------------------------------
// default state
//
// - Default case: ERROR
// - Go to DEVICE_UNATTACHED state
//
default:
device_state = DEVICE_UNATTACHED;
break;
}
#ifdef FREERTOS_USED
}
#endif
}
//! @brief Entry point of the USB device mamagement
//!
//! This function is the entry point of the USB management. Each USB
//! event is checked here in order to launch the appropriate action.
//! If a Setup request occurs on the Default Control Endpoint,
//! the usb_process_request() function is call in the usb_standard_request.c file
//!
//! @param none
//!
//! @return none
void usb_device_task(void)
{
#if (USB_OTG_FEATURE == ENABLED)
// Check if a reset has been received
if(Is_usb_event(EVT_USB_RESET))
{
Usb_ack_event(EVT_USB_RESET);
Usb_reset_endpoint(0);
usb_configuration_nb=0;
otg_b_device_state = B_IDLE;
Clear_otg_features_from_host();
}
// When OTG mode enabled, B-Device is managed thanks to its state machine
switch (otg_b_device_state)
{
//------------------------------------------------------
// B_IDLE state
//
// - waits for Vbus to rise
// - initiate SRP if asked by user
//
case B_IDLE:
if (Is_usb_vbus_high())
{
// Vbus rise
usb_connected = TRUE;
remote_wakeup_feature = DISABLED;
usb_start_device();
Usb_vbus_on_action();
Usb_attach();
otg_b_device_state = B_PERIPHERAL;
Ack_user_request_srp();
Clear_otg_features_from_host();
remote_wakeup_feature = DISABLED;
End_session_with_srp();
if (Is_srp_sent_and_waiting_answer() && (sof_seen_in_session == TRUE))
{
Ack_srp_sent_and_answer();
Otg_print_new_failure_message(OTGMSG_A_RESPONDED,OTG_TEMPO_2SEC);
}
Usb_enable_sof_interrupt();
}
else
{
if (Is_user_requested_srp() && Is_usb_id_device())
{
// User has requested a SRP
Ack_user_request_srp();
if (!Is_srp_sent_and_waiting_answer())
{
Pll_start_auto(); // reinit device mode
Wait_pll_ready();
Usb_disable();
Usb_enable_uid_pin();
Usb_enable();
Usb_unfreeze_clock();
Usb_select_device();
Usb_attach();
otg_b_device_state = B_SRP_INIT;
Usb_device_initiate_srp(); // hardware waits for initial condition (SE0, Session End level)
sof_seen_in_session = FALSE;
}
}
if ((Is_srp_sent_and_waiting_answer()) && (Is_tb_srp_counter_overflow()))
{
// SRP failed because A-Device did not respond
End_session_with_srp();
Ack_srp_sent_and_answer();
Otg_print_new_failure_message(OTGMSG_SRP_A_NO_RESP,OTG_TEMPO_3SEC);
}
}
break;
//------------------------------------------------------
// B_SRP_INIT
//
// - a SRP has been initiated
// - B-Device waits it is finished to initialize variables
//
case B_SRP_INIT:
if (!Is_usb_device_initiating_srp())
{
otg_b_device_state = B_IDLE; // SRP initiated, return to Idle state (wait for Vbus to rise)
Srp_sent_and_waiting_answer();
Init_tb_srp_counter();
Start_session_with_srp();
Otg_print_new_event_message(OTGMSG_SRP_STARTED,TB_SRP_FAIL_MIN);
}
break;
//------------------------------------------------------
// B_PERIPHERAL : the main state of OTG Peripheral
//
// - all events are interrupt-handled
// - but they are saved and this function can execute alternate actions
// - also handle user requests (disconnect)
//
// ======================================================================================
case B_PERIPHERAL:
if (Is_otg_event(EVT_OTG_DEVICE_CONNECTED))
{
Otg_ack_event(EVT_OTG_DEVICE_CONNECTED); // set on a SetConfiguration descriptor reception
Otg_print_new_event_message(OTGMSG_CONNECTED_TO_A,OTG_TEMPO_4SEC);
}
if (Is_usb_event(EVT_USB_SUSPEND)) // SUSPEND state
{
// Suspend and HNP operations are handled in the interrupt functions
}
if (Is_srp_sent_and_waiting_answer() && (sof_seen_in_session == TRUE))
{
Ack_srp_sent_and_answer();
Otg_print_new_failure_message(OTGMSG_A_RESPONDED,OTG_TEMPO_2SEC);
}
if ((Is_srp_sent_and_waiting_answer()) && (Is_tb_srp_counter_overflow()))
{
// SRP failed because A-Device did not respond
End_session_with_srp();
Ack_srp_sent_and_answer();
Otg_print_new_failure_message(OTGMSG_SRP_A_NO_RESP,OTG_TEMPO_3SEC);
}
if (Is_usb_event(EVT_USB_RESUME) && !Is_usb_pending_remote_wake_up()) // RESUME signal detected
{
Usb_ack_event(EVT_USB_RESUME);
Usb_ack_event(EVT_USB_SUSPEND);
Usb_ack_remote_wake_up_start();
}
if (Is_usb_event(EVT_USB_UNPOWERED))
{
Usb_ack_event(EVT_USB_UNPOWERED);
Clear_all_user_request();
otg_b_device_state = B_IDLE;
}
if(Is_usb_event(EVT_USB_RESET))
{
Usb_ack_event(EVT_USB_RESET);
Usb_reset_endpoint(0);
usb_configuration_nb=0;
Clear_otg_features_from_host();
}
if (Is_otg_event(EVT_OTG_HNP_ERROR))
{
Otg_ack_event(EVT_OTG_HNP_ERROR);
Otg_print_new_failure_message(OTGMSG_DEVICE_NO_RESP,OTG_TEMPO_4SEC);
PORTC &= ~0x10;
}
if (Is_user_requested_disc())
{
Ack_user_request_disc();
if (Is_usb_id_device())
{
Usb_detach();
Usb_freeze_clock();
while (Is_usb_vbus_high()); // wait for Vbus to be under Va_vbus_valid
otg_b_device_state = B_IDLE;
usb_configuration_nb = 0;
usb_connected = FALSE;
Clear_all_user_request();
}
}
break;
//------------------------------------------------------
// B_HOST
//
// - state entered after an HNP success
// - handle user requests (disconnection, suspend, hnp)
// - call the "host_task()" for Host level handlers
//
// ======================================================================================
case B_HOST:
if (Is_otg_event(EVT_OTG_DEV_UNSUPPORTED))
{
Otg_ack_event(EVT_OTG_DEV_UNSUPPORTED);
Clear_all_user_request();
otg_b_device_state = B_IDLE;
device_state = DEVICE_UNATTACHED;
}
if (Is_user_requested_disc() || Is_user_requested_suspend() || Is_user_requested_hnp())
{
Ack_user_request_disc(); // suspend and hnp requests cleared in B_END_HNP_SUSPEND stage
Host_disable_sof(); // go into suspend mode
Usb_host_reject_hnp();
otg_b_device_state = B_END_HNP_SUSPEND;
Usb_ack_suspend();
Usb_enable_suspend_interrupt();
}
if (Is_usb_event(EVT_USB_UNPOWERED))
{
Usb_ack_event(EVT_USB_UNPOWERED);
Usb_freeze_clock();
otg_b_device_state = B_IDLE;
device_state = DEVICE_UNATTACHED;
}
usb_host_task(); // call the host task
break;
//------------------------------------------------------
// B_END_HNP_SUSPEND
//
// - device enters this state after being B_HOST, on a user request to stop bus activity (suspend, disconnect or hnp request)
// - macro is reset to peripheral mode
//
// ======================================================================================
case B_END_HNP_SUSPEND:
if (Is_usb_event(EVT_USB_SUSPEND))
{
Usb_ack_event(EVT_USB_SUSPEND);
Usb_device_stop_hnp();
Usb_select_device();
device_state = DEVICE_UNATTACHED;
if (Is_user_requested_hnp() || Is_user_requested_suspend())
{
otg_b_device_state = B_PERIPHERAL;
Ack_user_request_suspend();
Ack_user_request_hnp();
}
else
{
otg_b_device_state = B_IDLE;
Usb_detach();
Usb_freeze_clock();
}
}
break;
default:
otg_b_device_state = B_IDLE;
Clear_all_user_request();
device_state = DEVICE_UNATTACHED;
break;
}
#else
// Non-OTG exclusives Device operations
// VBUS state detection
if (Is_usb_vbus_high()&& (usb_connected==FALSE))
{
usb_connected = TRUE;
remote_wakeup_feature = DISABLED;
Usb_vbus_on_action();
Usb_send_event(EVT_USB_POWERED);
usb_start_device();
}
if (Is_usb_vbus_low()&& (usb_connected==TRUE))
{
usb_connected = FALSE;
usb_configuration_nb = 0;
Usb_send_event(EVT_USB_UNPOWERED);
Usb_detach();
Usb_freeze_clock();
Usb_vbus_off_action();
}
if(Is_usb_event(EVT_USB_RESET))
{
Usb_ack_event(EVT_USB_RESET);
Usb_reset_endpoint(0);
usb_configuration_nb=0;
}
#endif
// =======================================
// Common Standard Device Control Requests
// =======================================
// - device enumeration process
// - device control commands and features
Usb_select_endpoint(EP_CONTROL);
if (Is_usb_receive_setup())
{
usb_process_request();
}
}
/**
* @brief This function send nb_data pointed with *buf with the pipe number specified
*
* @note This function will activate the host sof interrupt to detect timeout. The
* interrupt enable sof will be restore.
*
* @param pipe
* @param nb_data
* @param buf
*
* @return status
*/
U8 host_send_data(U8 pipe, U16 nb_data, U8 *buf)
{
U8 c;
U8 status=PIPE_GOOD;
U8 sav_int_sof_enable;
U8 nak_timeout;
U16 cpt_nak;
U8 nb_data_loaded;
U8 cpt_err_timeout=0;
#if (USER_PERIODIC_PIPE==ENABLE)
freeze_user_periodic_pipe();
#endif
sav_int_sof_enable=Is_host_sof_interrupt_enabled(); // Save state of enable sof interrupt
Host_enable_sof_interrupt();
Host_select_pipe(pipe);
Host_set_token_out();
Host_ack_out_sent();
Host_unfreeze_pipe();
while (nb_data != 0) // While there is something to send...
{
// Prepare data to be sent
c = Host_get_pipe_length();
if ( (U16)c > nb_data)
{
nb_data_loaded = (U8)nb_data;
c = nb_data;
}
else
{ nb_data_loaded = c; }
while (c!=0) // Load Pipe buffer
{
Host_write_byte(*buf++);
c--;
}
private_sof_counter=0; // Reset the counter in SOF detection sub-routine
cpt_nak=0;
nak_timeout=0;
Host_ack_out_sent();
Host_send_out();
while (!Is_host_out_sent())
{
if (Is_host_emergency_exit())// Async disconnection or role change detected under interrupt
{
status=PIPE_DELAY_TIMEOUT;
Host_reset_pipe(pipe);
goto host_send_data_end;
}
#if (TIMEOUT_DELAY_ENABLE==ENABLE)
if (private_sof_counter>=250) // Count 250ms (250sof)
{
private_sof_counter=0;
if (nak_timeout++>=TIMEOUT_DELAY) // Inc timeout and check for overflow
{
status=PIPE_DELAY_TIMEOUT;
Host_reset_pipe(pipe);
goto host_send_data_end;
}
}
#endif
if (Is_host_pipe_error()) // Any error ?
{
status = Host_error_status();
Host_ack_all_errors();
if(status == PIPE_TIMEOUT)
{
if(cpt_err_timeout++>100)
{
goto host_send_data_end;
}
else
{
c=0;
while(c<2) // wait 2 ms
{
if (Is_usb_event(EVT_HOST_SOF)) { Usb_ack_event(EVT_HOST_SOF); c++; }
if (Is_host_emergency_exit() ) {break;}
}
Host_unfreeze_pipe();
}
}
}
if (Is_host_stall()) // Stall management
{
status =PIPE_STALL;
Host_ack_stall();
goto host_send_data_end;
}
#if (NAK_TIMEOUT_ENABLE==ENABLE)
if(Is_host_nak_received()) //NAK received
{
Host_ack_nak_received();
if (cpt_nak++>NAK_SEND_TIMEOUT)
{
status = PIPE_NAK_TIMEOUT;
Host_reset_pipe(pipe);
goto host_send_data_end;
}
}
#endif
}
// Here OUT sent
nb_data -= nb_data_loaded;
status=PIPE_GOOD; // Frame correctly sent
Host_ack_out_sent();
}
while(0!=Host_number_of_busy_bank());
host_send_data_end:
Host_freeze_pipe();
// Restore sof interrupt enable state
if (sav_int_sof_enable==FALSE) {Host_disable_sof_interrupt();}
#if (USER_PERIODIC_PIPE==ENABLE)
unfreeze_user_periodic_pipe();
#endif
// And return...
return ((U8)status);
}
/**
* @brief Entry point of the USB host management
*
* The aim is to manage the device target connection and enumeration
* depending on the device_state, the function performs the required operations
* to get the device enumerated and configured
* Once the device is operationnal, the device_state value is DEVICE_READY
* This state should be tested by the host task application before performing
* any applicative requests to the device.
*
* @param none
*
* @return none
*
* \image html host_task.gif
*/
void usb_host_task(void)
{
switch (device_state)
{
//------------------------------------------------------
// DEVICE_UNATTACHED state
//
// - Default init state
// - Try to give device power supply
//
case DEVICE_UNATTACHED:
Host_clear_device_supported(); // Reset Device status
Host_clear_configured();
Host_clear_device_ready();
Usb_clear_all_event(); // Clear all software events
new_device_connected=FALSE;
selected_device=0;
#if (USB_HUB_SUPPORT==ENABLE)
nb_hub_present = 0;
#endif
#if (SOFTWARE_VBUS_CTRL==ENABLE)
if( Is_usb_bconnection_error_interrupt()||Is_usb_vbus_error_interrupt())
{
Usb_ack_bconnection_error_interrupt();
Usb_ack_vbus_error_interrupt();
Host_clear_vbus_request();
}
Usb_disable_vbus_pad();
Usb_enable_manual_vbus();
if(Is_usb_srp_interrupt())
{
Usb_ack_srp_interrupt();
Usb_enable_vbus_pad();
Usb_enable_vbus();
device_state=DEVICE_ATTACHED;
}
#else
Usb_enable_vbus(); // Give at least device power supply!!!
if(Is_usb_vbus_high())
{ device_state=DEVICE_ATTACHED; } // If VBUS ok goto to device connection expectation
#endif
break;
//------------------------------------------------------
// DEVICE_ATTACHED state
//
// - Vbus is on
// - Try to detected device connection
//
case DEVICE_ATTACHED :
if (Is_device_connection() || (force_enumeration==TRUE)) // Device pull-up detected
{
Host_ack_device_connection();
Host_clear_device_supported(); // Reset Device status
Host_clear_configured();
Host_clear_device_ready();
Usb_clear_all_event(); // Clear all software events
new_device_connected=FALSE;
force_enumeration=FALSE;
// Now device is connected, enable disconnection interrupt
Host_enable_device_disconnection_interrupt();
Enable_interrupt();
// Reset device status
Host_clear_device_supported();
Host_clear_configured();
Host_clear_device_ready();
Host_enable_sof(); // Start Start Of Frame generation
Host_enable_sof_interrupt(); // SOF will be detected under interrupt
c = 0;
while (c<100) // wait 100ms before USB reset
{
if (Is_usb_event(EVT_HOST_SOF)) { Usb_ack_event(EVT_HOST_SOF); c++; }// Count Start Of frame
if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) {goto device_attached_error;}
}
Host_disable_device_disconnection_interrupt();
Host_send_reset(); // First USB reset
Usb_ack_event(EVT_HOST_SOF);
while (Is_host_reset()); // Active wait of end of reset send
Host_ack_reset();
//Workaround for some bugly devices with powerless pull up
//usually low speed where data line rise slowly and can be interpretaded as disconnection
for(c=0;c!=0xFFFF;c++) // Basic Timeout counter
{
if(Is_usb_event(EVT_HOST_SOF)) //If we detect SOF, device is still alive and connected, just clear false disconnect flag
{
if(Is_device_disconnection())
{
Host_ack_device_connection();
Host_ack_device_disconnection();
break;
}
}
}
Host_enable_device_disconnection_interrupt();
// All USB pipes must be reconfigured after a USB reset generation
host_configure_pipe(PIPE_CONTROL, \
TYPE_CONTROL, \
TOKEN_SETUP, \
EP_CONTROL, \
SIZE_64, \
ONE_BANK, \
0 );
c = 0;
while (c<100) // wait 100ms after USB reset
{
if (Is_usb_event(EVT_HOST_SOF)) { Usb_ack_event(EVT_HOST_SOF); c++; }// Count Start Of frame
if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) {goto device_attached_error;}
}
device_state = DEVICE_POWERED;
c=0;
}
device_attached_error:
// Device connection error, or vbus pb -> Retry the connection process from the begining
if( Is_usb_bconnection_error_interrupt()||Is_usb_vbus_error_interrupt()||Is_usb_vbus_low())
{
Usb_ack_bconnection_error_interrupt();
Usb_enable_vbus_hw_control();
device_state=DEVICE_UNATTACHED;
Usb_disable_vbus();
Usb_disable_vbus_pad();
Usb_enable_vbus_pad();
Usb_ack_vbus_error_interrupt();
Usb_enable_vbus();
Usb_disable_vbus_hw_control();
Host_disable_sof();
}
break;
//------------------------------------------------------
// DEVICE_POWERED state
//
// - Device connection (attach) as been detected,
// - Wait 100ms and configure default control pipe
//
case DEVICE_POWERED :
LOG_STR_CODE(log_device_connected);
Host_device_connection_action();
if (Is_usb_event(EVT_HOST_SOF))
{
Usb_ack_event(EVT_HOST_SOF);
if (c++ >= 100) // Wait 100ms
{
device_state = DEVICE_DEFAULT;
}
}
break;
//------------------------------------------------------
// DEVICE_DEFAULT state
//
// - Get device descriptor
// - Reconfigure Pipe 0 according to Device EP0
// - Attribute device address
//
case DEVICE_DEFAULT :
// Get first device descriptor
Host_select_device(0);
usb_tree.device[0].ep_ctrl_size=8;
if( CONTROL_GOOD == host_get_device_descriptor_uncomplete())
{
c = 0;
while(c<20) // wait 20ms before USB reset (special buggly devices...)
{
if (Is_usb_event(EVT_HOST_SOF)) { Usb_ack_event(EVT_HOST_SOF); c++; }
if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) {break;}
}
Host_disable_device_disconnection_interrupt();
Host_send_reset(); // First USB reset
Usb_ack_event(EVT_HOST_SOF);
while (Is_host_reset()); // Active wait of end of reset send
Host_ack_reset();
//Workaround for some bugly devices with powerless pull up
//usually low speed where data line rise slowly and can be interpretaded as disconnection
for(c=0;c!=0xFFFF;c++) // Basic Timeout counter
{
if(Is_usb_event(EVT_HOST_SOF)) //If we detect SOF, device is still alive and connected, just clear false disconnect flag
{
if(Is_device_disconnection())
{
Host_ack_device_connection();
Host_ack_device_disconnection();
break;
}
}
}
Host_enable_device_disconnection_interrupt();
c = 0;
host_configure_pipe(PIPE_CONTROL, \
TYPE_CONTROL, \
TOKEN_SETUP, \
EP_CONTROL, \
SIZE_64, \
ONE_BANK, \
0 );
while(c<200) // wait 200ms after USB reset
{
if (Is_usb_event(EVT_HOST_SOF)) { Usb_ack_event(EVT_HOST_SOF); c++; }
if (Is_host_emergency_exit() || Is_usb_bconnection_error_interrupt()) {break;}
}
usb_tree.device[0].ep_ctrl_size=data_stage[OFFSET_FIELD_MAXPACKETSIZE];
// Give an absolute device address
host_set_address(DEVICE_BASE_ADDRESS);
usb_tree.device[0].device_address=DEVICE_BASE_ADDRESS;
device_state = DEVICE_ADDRESSED;
}
else
{ device_state = DEVICE_ERROR; }
break;
//------------------------------------------------------
// DEVICE_BASE_ADDRESSED state
//
// - Check if VID PID is in supported list
//
case DEVICE_ADDRESSED :
if (CONTROL_GOOD == host_get_device_descriptor())
{
// Detect if the device connected belongs to the supported devices table
if (HOST_TRUE == host_check_VID_PID())
{
Host_set_device_supported();
Host_device_supported_action();
device_state = DEVICE_CONFIGURED;
}
else
{
#if (HOST_STRICT_VID_PID_TABLE==ENABLE)
Host_device_not_supported_action();
device_state = DEVICE_ERROR;
#else
device_state = DEVICE_CONFIGURED;
#endif
}
}
else // Can not get device descriptor
{ device_state = DEVICE_ERROR; }
break;
//------------------------------------------------------
// DEVICE_CONFIGURED state
//
// - Configure pipes for the supported interface
// - Send Set_configuration() request
// - Goto full operating mode (device ready)
//
case DEVICE_CONFIGURED :
if (CONTROL_GOOD == host_get_configuration_descriptor())
{
if (HOST_FALSE != host_check_class()) // Class support OK?
{
usb_tree.nb_device++;
#if (HOST_AUTO_CFG_ENDPOINT==ENABLE)
if(host_auto_configure_endpoint())
#else
Host_set_configured(); // Assumes config is OK with user config
if(User_configure_endpoint()) // User call here instead of autoconfig
#endif
{
if (CONTROL_GOOD== host_set_configuration(1)) // Send Set_configuration
{
//host_set_interface(interface_bound,interface_bound_alt_set);
// device and host are now fully configured
// goto DEVICE READY normal operation
device_state = DEVICE_READY;
Host_set_device_ready();
// monitor device disconnection under interrupt
Host_enable_device_disconnection_interrupt();
// If user host application requires SOF interrupt event
// Keep SOF interrupt enable otherwize, disable this interrupt
#if (HOST_CONTINUOUS_SOF_INTERRUPT==DISABLE && USB_HUB_SUPPORT==DISABLE)
Host_disable_sof_interrupt();
#endif
#if (USB_HUB_SUPPORT==ENABLE)
// Check if the connected device is a hub
if(Get_class(0)==HUB_CLASS && Get_subclass(0)==0x00 && Get_protocol(0)==0x00)
{
// Get hub descriptor
if( Get_hub_descriptor()==CONTROL_GOOD)
{
// Power each port of the hub
i=data_stage[NB_PORT_OFFSET];
for(c=1;c<=i;c++)
{
Set_port_feature(PORT_POWER,c);
}
nb_hub_present = 1;
hub_device_address[0]=DEVICE_BASE_ADDRESS;
hub_init(nb_hub_present-1);
}
}
else
{
nb_hub_present = 0;
new_device_connected=TRUE;
}
#else
new_device_connected=TRUE;
#endif
Enable_interrupt();
LOG_STR_CODE(log_device_enumerated);
}
else// Problem during Set_configuration request...
{ device_state = DEVICE_ERROR; }
}
}
else // device class not supported...
{
device_state = DEVICE_ERROR;
LOG_STR_CODE(log_device_unsupported);
Host_device_class_not_supported_action();
}
}
else // Can not get configuration descriptors...
{ device_state = DEVICE_ERROR; }
break;
//------------------------------------------------------
// DEVICE_READY state
//
// - Full std operatinf mode
// - Nothing to do...
//
case DEVICE_READY: // Host full std operating mode!
new_device_connected=FALSE;
#if (USB_HUB_SUPPORT==ENABLE)
f_hub_port_disconnect=FALSE;
// If one hub is present in the USB tree and the period interval
// for the interrupt hub endpoint occurs
if(nb_hub_present && hub_interrupt_sof==0)
{
saved_device=selected_device; // Backup user selected device
for(j=1;j<=nb_hub_present;j++)
{
for(i=0;i<MAX_DEVICE_IN_USB_TREE;i++)
{
if(usb_tree.device[i].device_address==hub_device_address[j-1]) break;
}
Host_select_device(i);
Host_select_pipe(usb_tree.device[i].interface[0].ep[0].pipe_number);
Host_ack_nak_received();
Host_ack_in_received();
Host_unfreeze_pipe();
Host_send_in();
while(1)
{
if(Is_host_nak_received()) break;
if(Is_host_emergency_exit()) break;
if(Is_host_in_received()) break;
}
Host_freeze_pipe();
if(Is_host_nak_received())
{
Host_ack_nak_received();
}
if(Is_host_in_received())
{
if(Is_host_stall()==FALSE)
{
c=Host_read_byte();
}
Host_ack_in_received();
hub_manage_port_change_status(c,j);
}
} // for all hub
Host_select_device(saved_device); // Restore user selected device
#if (USER_PERIODIC_PIPE==ENABLE)
unfreeze_user_periodic_pipe();
#endif
}
#endif
break;
//------------------------------------------------------
// DEVICE_ERROR state
//
// - Error state
// - Do custom action call (probably go to default mode...)
//
case DEVICE_ERROR : // TODO !!!!
#if (HOST_ERROR_RESTART==ENABLE)
device_state=DEVICE_UNATTACHED;
#endif
Host_device_error_action();
break;
//------------------------------------------------------
// DEVICE_SUSPENDED state
//
// - Host application request to suspend the device activity
// - State machine comes here thanks to Host_request_suspend()
//
case DEVICE_SUSPENDED :
if(Is_device_supports_remote_wakeup()) // If the connected device supports remote wake up
{
host_set_feature_remote_wakeup(); // Enable this feature...
}
LOG_STR_CODE(log_going_to_suspend);
c = Is_host_sof_interrupt_enabled(); //Save current sof interrupt enable state
Host_disable_sof_interrupt();
Host_ack_sof();
Host_disable_sof(); // Stop start of frame generation, this generates the suspend state
Host_ack_hwup();
Host_enable_hwup_interrupt(); // Enable host wake-up interrupt
// (this is the unique USB interrupt able to wake up the CPU core from power-down mode)
Usb_freeze_clock();
Stop_pll();
Host_suspend_action(); // Custom action here! (for example go to power-save mode...)
device_state=DEVICE_WAIT_RESUME; // wait for device resume event
break;
//------------------------------------------------------
// DEVICE_WAIT_RESUME state
//
// - Wait in this state till the host receives an upstream resume from the device
// - or the host software request the device to resume
//
case DEVICE_WAIT_RESUME :
if(Is_usb_event(EVT_HOST_HWUP)|| Is_host_request_resume())// Remote wake up has been detected
// or Local resume request has been received
{
if(Is_host_request_resume()) // Not a remote wakeup, but an host application request
{
Host_disable_hwup_interrupt(); // Wake up interrupt should be disable host is now wake up !
// CAUTION HWUP can be cleared only when USB clock is active
Pll_start_auto(); // First Restart the PLL for USB operation
Wait_pll_ready(); // Get sure pll is lock
Usb_unfreeze_clock(); // Enable clock on USB interface
Host_ack_hwup(); // Clear HWUP interrupt flag
}
Host_enable_sof();
Host_send_resume(); // Send down stream resume
while (Is_host_down_stream_resume()==FALSE); // Wait Down stream resume sent
Host_ack_remote_wakeup(); // Ack remote wake-up reception
Host_ack_request_resume(); // Ack software request
Host_ack_down_stream_resume(); // Ack down stream resume sent
Usb_ack_event(EVT_HOST_HWUP); // Ack software event
if(c) { Host_enable_sof_interrupt(); } // Restore SOF interrupt enable state before suspend
device_state=DEVICE_READY; // Come back to full operating mode
LOG_STR_CODE(log_usb_resumed);
}
break;
//------------------------------------------------------
// DEVICE_DISCONNECTED state
//
// - Device disconnection has been detected
// - Run scheduler in this state at least two times to get sure event is detected by all host application tasks
// - Go to DEVICE_DISCONNECTED_ACK state before DEVICE_UNATTACHED, to get sure scheduler calls all app tasks...
//
case DEVICE_DISCONNECTED :
device_state = DEVICE_DISCONNECTED_ACK;
break;
//------------------------------------------------------
// DEVICE_DISCONNECTED_ACK state
//
// - Device disconnection has been detected and managed bu applicatives tasks
// - Go to DEVICE_UNATTACHED state
//
case DEVICE_DISCONNECTED_ACK :
device_state = DEVICE_UNATTACHED;
break;
//------------------------------------------------------
// default state
//
// - Default case: ERROR
// - Goto no device state
//
default :
device_state = DEVICE_UNATTACHED;
break;
}
}