bit circ_buffer_put_nbytes(circ_buffer_t *b, uint8_t *bytes, uint16_t *n){
uint16_t n_actual = 0;
bit ret = PASS;
uint8_t int_state = Get_interrupt_state();
Disable_interrupt();
while(b->num != b->size &&
n_actual < *n){
b->buf[b->end] = bytes[n_actual];
b->end = b->end + 1;
if(b->end == b->size)
b->end = 0;
b->num = b->num + 1;
n_actual++;
}
if(n_actual < *n){
ret = FAIL;
}
*n = n_actual;
if(int_state != 0)
Enable_interrupt();
return ret;
}
//!
//! @brief This function initializes the USB device controller and system interrupt
//!
//! This function enables the USB controller and init the USB interrupts.
//! The aim is to allow the USB connection detection in order to send
//! the appropriate USB event to the operating mode manager.
//!
//! @param none
//!
//! @return none
//!
//!/
void usb_device_task_init(void)
{
Enable_interrupt();
Usb_disable();
Usb_enable();
Usb_select_device();
#if (USB_LOW_SPEED_DEVICE==ENABLE)
Usb_low_speed_mode();
#endif
Enable_interrupt();
#if (USB_OTG_FEATURE == ENABLED)
Usb_enable_id_interrupt();
Clear_otg_features_from_host();
otg_device_sessions = 0;
#endif
}
void Set_cpu_prescaler(U8 x)
{
U8 save_int=Get_interrupt_state();
Disable_interrupt();
CLKPR=(1<<CLKPCE);
CLKPR=x;
if(save_int) { Enable_interrupt(); }
}
//! This function enables switches interruptions and enters the CPU in power down mode.
//!
//! @verbatim
//! This function is executed when a suspend is received.
//! @endverbatim
//!
void suspend_action(void)
{
#if (USB_REMOTE_WAKEUP_FEATURE == ENABLED)
if (remote_wakeup_feature == ENABLED)
{
Switches_enable_it();
}
Led1_off();
Enable_interrupt();
Enter_power_down_mode();
Led1_on();
#endif
}
/**
* @brief This function initializes the USB process.
*
* Depending on the mode supported (HOST/DEVICE/DUAL_ROLE) the function
* calls the coresponding usb mode initialization function
*
* @param none
*
* @return none
*/
void usb_task_init(void)
{
#if (USB_HOST_FEATURE == ENABLED && USB_DEVICE_FEATURE == ENABLED)
U8 delay;
#endif
#if (USE_USB_PADS_REGULATOR==ENABLE) // Otherwise assume USB PADs regulator is not used
Usb_enable_regulator();
#endif
// ---- DUAL ROLE DEVICE USB MODE ---------------------------------------------
#if ((USB_DEVICE_FEATURE == ENABLED)&& (USB_HOST_FEATURE == ENABLED))
Usb_enable_uid_pin();
delay=PORTA;
g_usb_mode=USB_MODE_UNDEFINED;
if(Is_usb_id_device())
{
g_usb_mode=USB_MODE_DEVICE;
usb_device_task_init();
}
else
{
g_usb_mode=USB_MODE_HOST;
Usb_ack_id_transition(); // REQUIRED !!! Startup with ID=0, Ack ID pin transistion (default hwd start up is device mode)
#if ( ID_PIN_CHANGE_GENERATE_RESET == ENABLE)
Usb_enable_id_interrupt();
#endif
Enable_interrupt();
usb_host_task_init();
}
g_old_usb_mode=g_usb_mode; // Store current usb mode, for mode change detection
// -----------------------------------------------------------------------------
// ---- DEVICE ONLY USB MODE ---------------------------------------------------
#elif ((USB_DEVICE_FEATURE == ENABLED)&& (USB_HOST_FEATURE == DISABLE))
Usb_force_device_mode();
usb_device_task_init();
// -----------------------------------------------------------------------------
// ---- REDUCED HOST ONLY USB MODE ---------------------------------------------
#elif ((USB_DEVICE_FEATURE == DISABLE)&& (USB_HOST_FEATURE == ENABLED))
Usb_force_host_mode();
usb_host_task_init();
#elif ((USB_DEVICE_FEATURE == DISABLE)&& (USB_HOST_FEATURE == DISABLE))
#error at least one of USB_DEVICE_FEATURE or USB_HOST_FEATURE should be enabled
#endif
// -----------------------------------------------------------------------------
}
//!
//! @brief This function initializes the USB device controller
//!
//! This function enables the USB controller and init the USB interrupts.
//! The aim is to allow the USB connection detection in order to send
//! the appropriate USB event to the operating mode manager.
//! Start device function is executed once VBUS connection has been detected
//! either by the VBUS change interrupt either by the VBUS high level
//!
//! @param none
//!
//! @return none
//!
void usb_start_device (void)
{
Pll_start_auto();
Wait_pll_ready();
Disable_interrupt();
Usb_unfreeze_clock();
usb_init_device(); // configure the USB controller EP0
Usb_attach();
Enable_interrupt();
Usb_enable_suspend_interrupt();
Usb_enable_reset_interrupt();
#if (USB_OTG_FEATURE == ENABLED)
Usb_enable_id_interrupt();
#endif
}
bit circ_buffer_put_byte(circ_buffer_t *b, uint8_t byte){
bit ret = PASS;
uint8_t int_state = Get_interrupt_state();
Disable_interrupt();
if(b->num == b->size){
ret=FAIL;
goto end;
}
b->buf[b->end] = byte;
b->end = b->end + 1;
if(b->end == b->size)
b->end = 0;
b->num = b->num + 1;
end:
if(int_state != 0)
Enable_interrupt();
return ret;
}
bit circ_buffer_get_byte(circ_buffer_t *b, uint8_t *byte){
bit ret = PASS;
uint8_t int_state = Get_interrupt_state();
Disable_interrupt();
if(b->num == 0){
ret = FAIL;
goto end;
}
*byte = b->buf[b->start];
b->start = b->start + 1;
if(b->start == b->size)
b->start = 0;
b->num = b->num - 1;
end:
if(int_state != 0)
Enable_interrupt();
return ret;
}
/**
* @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;
}
}
extern void suspend_action(void)
{
Enable_interrupt();
Enter_power_down_mode();
}
