/**
* @brief Entry point of the USB mamnagement
*
* Depending on the USB mode supported (HOST/DEVICE/DUAL_ROLE) the function
* calls the coresponding usb management function.
*
* @param none
*
* @return none
*/
void usb_task(void)
{
// ---- DUAL ROLE DEVICE USB MODE ---------------------------------------------
#if ((USB_DEVICE_FEATURE == ENABLED)&& (USB_HOST_FEATURE == ENABLED))
if(Is_usb_id_device())
{ g_usb_mode=USB_MODE_DEVICE;}
else
{ g_usb_mode=USB_MODE_HOST;}
// TODO !!! ID pin hot state change
// Preliminary management: HARDWARE RESET !!!
#if ( ID_PIN_CHANGE_GENERATE_RESET == ENABLE)
// Hot ID transition generates wdt reset
if((g_old_usb_mode!=g_usb_mode))
#ifndef AVRGCC
{Wdt_change_16ms(); while(1); LOG_STR_CODE(log_id_change);}
#else
{Wdt_change_enable(); while(1); LOG_STR_CODE(log_id_change);}
#endif
#endif
g_old_usb_mode=g_usb_mode; // Store current usb mode, for mode change detection
// Depending on current usb mode, launch the correct usb task (device or host)
switch(g_usb_mode)
{
case USB_MODE_DEVICE:
usb_device_task();
break;
case USB_MODE_HOST:
usb_host_task();
break;
case USB_MODE_UNDEFINED: // No break !
default:
break;
}
// -----------------------------------------------------------------------------
// ---- DEVICE ONLY USB MODE ---------------------------------------------------
#elif ((USB_DEVICE_FEATURE == ENABLED)&& (USB_HOST_FEATURE == DISABLE))
usb_device_task();
// -----------------------------------------------------------------------------
// ---- REDUCED HOST ONLY USB MODE ---------------------------------------------
#elif ((USB_DEVICE_FEATURE == DISABLE)&& (USB_HOST_FEATURE == ENABLED))
usb_host_task();
// -----------------------------------------------------------------------------
//! ---- ERROR, NO MODE ENABLED -------------------------------------------------
#elif ((USB_DEVICE_FEATURE == DISABLE)&& (USB_HOST_FEATURE == DISABLE))
#error at least one of USB_DEVICE_FEATURE or USB_HOST_FEATURE should be enabled
#error otherwise the usb task has nothing to do ...
#endif
// -----------------------------------------------------------------------------
}
__interrupt void usb_general_interrupt()
#endif
{
#if (USB_HOST_PIPE_INTERRUPT_TRANSFER == ENABLE)
U8 i;
U8 save_pipe_nb;
#endif
// ---------- DEVICE events management -----------------------------------
#if (USB_DEVICE_FEATURE == ENABLED)
// - Device start of frame received
if (Is_usb_sof() && Is_sof_interrupt_enabled())
{
Usb_ack_sof();
Usb_sof_action();
}
#ifdef WA_USB_SUSPEND_PERTUBATION
// - Device Suspend event (no more USB activity detected)
if (Is_usb_suspend() && Is_suspend_interrupt_enabled())
{
usb_suspended=TRUE;
Usb_ack_wake_up(); // clear wake up to detect next event
Usb_send_event(EVT_USB_SUSPEND);
Usb_ack_suspend();
Usb_enable_wake_up_interrupt();
Usb_disable_resume_interrupt();
Usb_freeze_clock();
Stop_pll();
Usb_suspend_action();
}
// - Wake up event (USB activity detected): Used to resume
if (Is_usb_wake_up() && Is_wake_up_interrupt_enabled())
{
if(Is_pll_ready()==FALSE)
{
Pll_start_auto();
Wait_pll_ready();
}
Usb_unfreeze_clock();
Usb_ack_wake_up();
if(usb_suspended)
{
Usb_enable_resume_interrupt();
Usb_enable_reset_interrupt();
while(Is_usb_wake_up())
{
Usb_ack_wake_up();
}
usb_delay_ms(2);
if(Is_usb_sof() || Is_usb_resume() || Is_usb_reset() )
{
Usb_disable_wake_up_interrupt();
Usb_wake_up_action();
Usb_send_event(EVT_USB_WAKE_UP);
Usb_enable_suspend_interrupt();
Usb_enable_resume_interrupt();
Usb_enable_reset_interrupt();
}
else // Workarround to make the USB enter power down mode again (spurious transcient detected on the USB lines)
{
Usb_ack_wake_up(); // clear wake up to detect next event
Usb_send_event(EVT_USB_SUSPEND);
Usb_enable_wake_up_interrupt();
Usb_disable_resume_interrupt();
Usb_freeze_clock();
Stop_pll();
Usb_suspend_action();
}
}
}
// - Resume state bus detection
if (Is_usb_resume() && Is_resume_interrupt_enabled())
{
usb_suspended = FALSE;
Usb_disable_wake_up_interrupt();
Usb_ack_resume();
Usb_disable_resume_interrupt();
Usb_resume_action();
Usb_send_event(EVT_USB_RESUME);
}
#else
// - Device Suspend event (no more USB activity detected)
if (Is_usb_suspend() && Is_suspend_interrupt_enabled())
{
// Remote wake-up handler
if ((remote_wakeup_feature == ENABLED) && (usb_configuration_nb != 0))
{
Usb_disable_suspend_interrupt();
Usb_ack_wake_up();
Usb_enable_wake_up_interrupt();
Stop_pll();
Usb_freeze_clock();
Usb_suspend_action();
// After that user can execute "Usb_initiate_remote_wake_up()" to initiate a remote wake-up
// Note that the suspend interrupt flag SUSPI must still be set to enable upstream resume
// So the SUSPE enable bit must be cleared to avoid redundant interrupt
// ****************
// Please note also that is Vbus is lost during an upstream resume (Host disconnection),
// the RMWKUP bit (used to initiate remote wake up and that is normally cleared by hardware when sent)
// remains set after the event, so that a good way to handle this feature is :
// Usb_unfreeze_clock();
// Usb_initiate_remote_wake_up();
// while (Is_usb_pending_remote_wake_up())
// {
// if (Is_usb_vbus_low())
// {
// // Emergency action (reset macro, etc.) if Vbus lost during resuming
// break;
// }
// }
// Usb_ack_remote_wake_up_start();
// ****************
}
else
{
// No remote wake-up supported
Usb_ack_wake_up(); // clear wake up to detect next event
Usb_send_event(EVT_USB_SUSPEND);
Usb_ack_suspend(); // must be executed last (after Usb_suspend_action()) to allow upstream resume
Usb_enable_wake_up_interrupt();
Usb_freeze_clock();
Stop_pll();
Usb_suspend_action();
}
}
// - Wake up event (USB activity detected): Used to resume
if (Is_usb_wake_up() && Is_wake_up_interrupt_enabled())
{
if(Is_pll_ready()==FALSE)
{
Pll_start_auto();
Wait_pll_ready();
}
Usb_unfreeze_clock();
Usb_ack_wake_up();
Usb_disable_wake_up_interrupt();
Usb_wake_up_action();
Usb_send_event(EVT_USB_WAKE_UP);
Usb_enable_suspend_interrupt();
}
// - Resume state bus detection
if (Is_usb_resume() && Is_resume_interrupt_enabled())
{
Usb_disable_wake_up_interrupt();
Usb_ack_resume();
Usb_disable_resume_interrupt();
Usb_resume_action();
Usb_send_event(EVT_USB_RESUME);
}
#endif
// - USB bus reset detection
if (Is_usb_reset()&& Is_reset_interrupt_enabled())
{
Usb_ack_reset();
usb_init_device();
Usb_reset_action();
Usb_send_event(EVT_USB_RESET);
}
#endif// End DEVICE FEATURE MODE
// ---------- HOST events management -----------------------------------
#if (USB_HOST_FEATURE == ENABLED && USB_DEVICE_FEATURE == ENABLED)
// - ID pin change detection
if(Is_usb_id_transition()&&Is_usb_id_interrupt_enabled())
{
if(Is_usb_id_device())
{ g_usb_mode=USB_MODE_DEVICE;}
else
{ g_usb_mode=USB_MODE_HOST;}
Usb_ack_id_transition();
if( g_usb_mode != g_old_usb_mode) // Basic Debounce
{
if(Is_usb_id_device()) // Going to device mode
{
Usb_send_event(EVT_USB_DEVICE_FUNCTION);
}
else // Going to host mode
{
Usb_send_event(EVT_USB_HOST_FUNCTION);
}
Usb_id_transition_action();
LOG_STR_CODE(log_id_change);
#if ( ID_PIN_CHANGE_GENERATE_RESET == ENABLE)
// Hot ID transition generates wdt reset
wdtdrv_enable(WDTO_16MS);
while(1);
#endif
}
}
#endif
#if (USB_HOST_FEATURE == ENABLED)
// - The device has been disconnected
if(Is_device_disconnection() && Is_host_device_disconnection_interrupt_enabled())
{
host_disable_all_pipe();
Host_ack_device_disconnection();
device_state=DEVICE_DISCONNECTED;
Usb_send_event(EVT_HOST_DISCONNECTION);
init_usb_tree();
LOG_STR_CODE(log_device_disconnect);
Host_device_disconnection_action();
}
// - Device connection
if(Is_device_connection() && Is_host_device_connection_interrupt_enabled())
{
Host_ack_device_connection();
host_disable_all_pipe();
Host_device_connection_action();
}
// - Host Start of frame has been sent
if (Is_host_sof() && Is_host_sof_interrupt_enabled())
{
Host_ack_sof();
Usb_send_event(EVT_HOST_SOF);
private_sof_counter++;
#if (USB_HUB_SUPPORT==ENABLE)
hub_interrupt_sof++;
#endif
// delay timeout management for interrupt tranfer mode in host mode
#if ((USB_HOST_PIPE_INTERRUPT_TRANSFER==ENABLE) && (TIMEOUT_DELAY_ENABLE==ENABLE))
if (private_sof_counter>=250) // Count 1/4 sec
{
private_sof_counter=0;
for(i=0;i<MAX_EP_NB;i++)
{
if(it_pipe_str[i].enable==ENABLE)
{
save_pipe_nb=Host_get_selected_pipe();
Host_select_pipe(i);
if((++it_pipe_str[i].timeout>TIMEOUT_DELAY) && (Host_get_pipe_type()!=TYPE_INTERRUPT))
{
it_pipe_str[i].enable=DISABLE;
it_pipe_str[i].status=PIPE_DELAY_TIMEOUT;
Host_stop_pipe_interrupt(i);
if (is_any_interrupt_pipe_active()==FALSE) // If no more transfer is armed
{
if (g_sav_int_sof_enable==FALSE)
{
Host_disable_sof_interrupt();
}
}
it_pipe_str[i].handle(PIPE_DELAY_TIMEOUT,it_pipe_str[i].nb_byte_processed);
}
Host_select_pipe(save_pipe_nb);
}
}
}
#endif // (USB_HOST_PIPE_INTERRUPT_TRANSFER==ENABLE) && (TIMEOUT_DELAY_ENABLE==ENABLE))
Host_sof_action();
}
// - Host Wake-up has been received
if (Is_host_hwup() && Is_host_hwup_interrupt_enabled())
{
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 (not frozen)!
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
Usb_send_event(EVT_HOST_HWUP); // Send software event
Host_hwup_action(); // Map custom action
}
#endif // End HOST FEATURE MODE
}
/**
* @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;
}
}
__interrupt void usb_general_interrupt()
#endif
{
#if (USB_HOST_PIPE_INTERRUPT_TRANSFER == ENABLE)
U8 i;
U8 save_pipe_nb;
#endif
// ---------- DEVICE events management -----------------------------------
#if (USB_DEVICE_FEATURE == ENABLED)
//- VBUS state detection
if (Is_usb_vbus_transition() && Is_usb_vbus_interrupt_enabled())
{
Usb_ack_vbus_transition();
if (Is_usb_vbus_high())
{
usb_connected = TRUE;
Usb_vbus_on_action();
Usb_send_event(EVT_USB_POWERED);
Usb_enable_reset_interrupt();
usb_start_device();
Usb_attach();
}
else
{
Usb_vbus_off_action();
usb_connected = FALSE;
usb_configuration_nb = 0;
Usb_send_event(EVT_USB_UNPOWERED);
}
}
// - Device start of frame received
if (Is_usb_sof() && Is_sof_interrupt_enabled())
{
Usb_ack_sof();
Usb_sof_action();
}
// - Device Suspend event (no more USB activity detected)
if (Is_usb_suspend() && Is_suspend_interrupt_enabled())
{
Usb_ack_suspend();
Usb_enable_wake_up_interrupt();
Usb_ack_wake_up(); // clear wake up to detect next event
Usb_freeze_clock();
Usb_send_event(EVT_USB_SUSPEND);
Usb_suspend_action();
}
// - Wake up event (USB activity detected): Used to resume
if (Is_usb_wake_up() && Is_swake_up_interrupt_enabled())
{
Usb_unfreeze_clock();
Usb_ack_wake_up();
Usb_disable_wake_up_interrupt();
Usb_wake_up_action();
Usb_send_event(EVT_USB_WAKE_UP);
}
// - Resume state bus detection
if (Is_usb_resume() && Is_resume_interrupt_enabled())
{
Usb_disable_wake_up_interrupt();
Usb_ack_resume();
Usb_disable_resume_interrupt();
Usb_resume_action();
Usb_send_event(EVT_USB_RESUME);
}
// - USB bus reset detection
if (Is_usb_reset()&& Is_reset_interrupt_enabled())
{
Usb_ack_reset();
usb_init_device();
Usb_reset_action();
Usb_send_event(EVT_USB_RESET);
}
#endif// End DEVICE FEATURE MODE
// ---------- HOST events management -----------------------------------
#if (USB_HOST_FEATURE == ENABLED && USB_DEVICE_FEATURE == ENABLED)
// - ID pin change detection
if(Is_usb_id_transition()&&Is_usb_id_interrupt_enabled())
{
if(Is_usb_id_device())
{ g_usb_mode=USB_MODE_DEVICE;}
else
{ g_usb_mode=USB_MODE_HOST;}
Usb_ack_id_transition();
if( g_usb_mode != g_old_usb_mode) // Basic Debounce
{
if(Is_usb_id_device()) // Going to device mode
{
Usb_send_event(EVT_USB_DEVICE_FUNCTION);
}
else // Going to host mode
{
Usb_send_event(EVT_USB_HOST_FUNCTION);
}
Usb_id_transition_action();
LOG_STR_CODE(log_id_change);
#if ( ID_PIN_CHANGE_GENERATE_RESET == ENABLE)
// Hot ID transition generates wdt reset
#ifndef AVRGCC
Wdt_change_16ms(); while(1);
#else
Wdt_change_enable(); while(1);
#endif
#endif
}
}
#endif
#if (USB_HOST_FEATURE == ENABLED)
// - The device has been disconnected
if(Is_device_disconnection() && Is_host_device_disconnection_interrupt_enabled())
{
host_disable_all_pipe();
Host_ack_device_disconnection();
device_state=DEVICE_DISCONNECTED;
Usb_send_event(EVT_HOST_DISCONNECTION);
LOG_STR_CODE(log_device_disconnect);
Host_device_disconnection_action();
}
// - Device connection
if(Is_device_connection() && Is_host_device_connection_interrupt_enabled())
{
Host_ack_device_connection();
host_disable_all_pipe();
Host_device_connection_action();
}
// - Host Start of frame has been sent
if (Is_host_sof() && Is_host_sof_interrupt_enabled())
{
Host_ack_sof();
Usb_send_event(EVT_HOST_SOF);
private_sof_counter++;
// delay timeout management for interrupt tranfer mode in host mode
#if ((USB_HOST_PIPE_INTERRUPT_TRANSFER==ENABLE) && (TIMEOUT_DELAY_ENABLE==ENABLE))
if (private_sof_counter>=250) // Count 1/4 sec
{
private_sof_counter=0;
for(i=0;i<MAX_EP_NB;i++)
{
if(it_pipe_str[i].enable==ENABLE)
{
save_pipe_nb=Host_get_selected_pipe();
Host_select_pipe(i);
if((++it_pipe_str[i].timeout>TIMEOUT_DELAY) && (Host_get_pipe_type()!=TYPE_INTERRUPT))
{
it_pipe_str[i].enable=DISABLE;
it_pipe_str[i].status=PIPE_DELAY_TIMEOUT;
Host_stop_pipe_interrupt(i);
if (is_any_interrupt_pipe_active()==FALSE) // If no more transfer is armed
{
if (g_sav_int_sof_enable==FALSE)
{
Host_disable_sof_interrupt();
}
}
it_pipe_str[i].handle(PIPE_DELAY_TIMEOUT,it_pipe_str[i].nb_byte_processed);
}
Host_select_pipe(save_pipe_nb);
}
}
}
#endif // (USB_HOST_PIPE_INTERRUPT_TRANSFER==ENABLE) && (TIMEOUT_DELAY_ENABLE==ENABLE))
Host_sof_action();
}
// - Host Wake-up has been received
if (Is_host_hwup() && Is_host_hwup_interrupt_enabled())
{
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 (not frozen)!
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
Usb_send_event(EVT_HOST_HWUP); // Send software event
Host_hwup_action(); // Map custom action
}
#endif // End HOST FEATURE MODE
}
