Merge pull request #2213 from Rocky04/patch-5

Adding support for a generic SOF callback

src/class/audio/audio_device.c

@@ -1835,7 +1835,7 @@ static bool audiod_set_interface(uint8_t rhport, tusb_control_request_t const *
             audio->feedback.frame_shift = desc_ep->bInterval -1;
 
             // Enable SOF interrupt if callback is implemented
-            if (tud_audio_feedback_interval_isr) usbd_sof_enable(rhport, true);
+            if (tud_audio_feedback_interval_isr) usbd_sof_enable(rhport, SOF_CONSUMER_AUDIO, true);
           }
   #endif
 #endif // CFG_TUD_AUDIO_ENABLE_EP_OUT
@@ -1909,7 +1909,7 @@ static bool audiod_set_interface(uint8_t rhport, tusb_control_request_t const *
       break;
     }
   }
-  if (disable) usbd_sof_enable(rhport, false);
+  if (disable) usbd_sof_enable(rhport, SOF_CONSUMER_AUDIO, false);
 #endif
 
 #if CFG_TUD_AUDIO_ENABLE_EP_IN && CFG_TUD_AUDIO_EP_IN_FLOW_CONTROL

src/device/usbd.c

@@ -56,6 +56,10 @@ TU_ATTR_WEAK void tud_event_hook_cb(uint8_t rhport, uint32_t eventid, bool in_is
   (void)in_isr;
 }
 
+TU_ATTR_WEAK void tud_sof_cb(uint32_t frame_count) {
+  (void)frame_count;
+}
+
 //--------------------------------------------------------------------+
 // Device Data
 //--------------------------------------------------------------------+
@@ -76,6 +80,7 @@ typedef struct {
   volatile uint8_t cfg_num; // current active configuration (0x00 is not configured)
   uint8_t speed;
   volatile uint8_t setup_count;
+  volatile uint8_t sof_consumer;
 
   uint8_t itf2drv[CFG_TUD_INTERFACE_MAX];   // map interface number to driver (0xff is invalid)
   uint8_t ep2drv[CFG_TUD_ENDPPOINT_MAX][2]; // map endpoint to driver ( 0xff is invalid ), can use only 4-bit each
@@ -275,6 +280,7 @@ TU_ATTR_ALWAYS_INLINE static inline usbd_class_driver_t const * get_driver(uint8
   return driver;
 }
 
+
 //--------------------------------------------------------------------+
 // DCD Event
 //--------------------------------------------------------------------+
@@ -382,6 +388,12 @@ bool tud_connect(void) {
   return true;
 }
 
+bool tud_sof_cb_enable(bool en)
+{
+  usbd_sof_enable(_usbd_rhport, SOF_CONSUMER_USER, en);
+  return true;
+}
+
 //--------------------------------------------------------------------+
 // USBD Task
 //--------------------------------------------------------------------+
@@ -612,6 +624,12 @@ void tud_task_ext(uint32_t timeout_ms, bool in_isr) {
         break;
 
       case DCD_EVENT_SOF:
+        if (tu_bit_test(_usbd_dev.sof_consumer, SOF_CONSUMER_USER)) {
+          TU_LOG_USBD("\r\n");
+          tud_sof_cb(event.sof.frame_count);
+        }
+      break;
+
       default:
         TU_BREAKPOINT();
         break;
@@ -702,6 +720,9 @@ static bool process_control_request(uint8_t rhport, tusb_control_request_t const
               // already configured: need to clear all endpoints and driver first
               TU_LOG_USBD("  Clear current Configuration (%u) before switching\r\n", _usbd_dev.cfg_num);
 
+              // disable SOF
+              dcd_sof_enable(rhport, false);
+
               // close all non-control endpoints, cancel all pending transfers if any
               dcd_edpt_close_all(rhport);
 
@@ -1101,6 +1122,14 @@ TU_ATTR_FAST_FUNC void dcd_event_handler(dcd_event_t const* event, bool in_isr)
       break;
 
     case DCD_EVENT_SOF:
+      // SOF driver handler in ISR context
+      for (uint8_t i = 0; i < TOTAL_DRIVER_COUNT; i++) {
+        usbd_class_driver_t const* driver = get_driver(i);
+        if (driver && driver->sof) {
+          driver->sof(event->rhport, event->sof.frame_count);
+        }
+      }
+
       // Some MCUs after running dcd_remote_wakeup() does not have way to detect the end of remote wakeup
       // which last 1-15 ms. DCD can use SOF as a clear indicator that bus is back to operational
       if (_usbd_dev.suspended) {
@@ -1110,15 +1139,10 @@ TU_ATTR_FAST_FUNC void dcd_event_handler(dcd_event_t const* event, bool in_isr)
         queue_event(&event_resume, in_isr);
       }
 
-      // SOF driver handler in ISR context
-      for (uint8_t i = 0; i < TOTAL_DRIVER_COUNT; i++) {
-        usbd_class_driver_t const* driver = get_driver(i);
-        if (driver && driver->sof) {
-          driver->sof(event->rhport, event->sof.frame_count);
-        }
+      if (tu_bit_test(_usbd_dev.sof_consumer, SOF_CONSUMER_USER)) {
+        dcd_event_t const event_sof = {.rhport = event->rhport, .event_id = DCD_EVENT_SOF};
+        queue_event(&event_sof, in_isr);
       }
-
-      // skip osal queue for SOF in usbd task
       break;
 
     case DCD_EVENT_SETUP_RECEIVED:
@@ -1355,12 +1379,21 @@ void usbd_edpt_close(uint8_t rhport, uint8_t ep_addr) {
   return;
 }
 
-void usbd_sof_enable(uint8_t rhport, bool en) {
+void usbd_sof_enable(uint8_t rhport, sof_consumer_t consumer, bool en) {
   rhport = _usbd_rhport;
 
-  // TODO: Check needed if all drivers including the user sof_cb does not need an active SOF ISR any more.
-  // Only if all drivers switched off SOF calls the SOF interrupt may be disabled
-  dcd_sof_enable(rhport, en);
+  uint8_t consumer_old = _usbd_dev.sof_consumer;
+  // Keep track how many class instances need the SOF interrupt
+  if (en) {
+    _usbd_dev.sof_consumer |= (uint8_t)(1 << consumer);
+  } else {
+    _usbd_dev.sof_consumer &= (uint8_t)(~(1 << consumer));
+  }
+
+  // Test logically unequal
+  if(!_usbd_dev.sof_consumer != !consumer_old) {
+    dcd_sof_enable(rhport, _usbd_dev.sof_consumer);
+  }
 }
 
 bool usbd_edpt_iso_alloc(uint8_t rhport, uint8_t ep_addr, uint16_t largest_packet_size) {

src/device/usbd.h

@@ -97,6 +97,9 @@ bool tud_disconnect(void);
 // Return false on unsupported MCUs
 bool tud_connect(void);
 
+// Enable or disable the Start Of Frame callback support
+bool tud_sof_cb_enable(bool en);
+
 // Carry out Data and Status stage of control transfer
 // - If len = 0, it is equivalent to sending status only
 // - If len > wLength : it will be truncated
@@ -152,6 +155,9 @@ TU_ATTR_WEAK void tud_resume_cb(void);
 // Invoked when there is a new usb event, which need to be processed by tud_task()/tud_task_ext()
 void tud_event_hook_cb(uint8_t rhport, uint32_t eventid, bool in_isr);
 
+// Invoked when a new (micro) frame started
+void tud_sof_cb(uint32_t frame_count);
+
 // Invoked when received control request with VENDOR TYPE
 TU_ATTR_WEAK bool tud_vendor_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb_control_request_t const * request);
 

src/device/usbd_pvt.h

@@ -35,6 +35,15 @@
 
 #define TU_LOG_USBD(...)   TU_LOG(CFG_TUD_LOG_LEVEL, __VA_ARGS__)
 
+//--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF PROTYPES
+//--------------------------------------------------------------------+
+
+typedef enum {
+  SOF_CONSUMER_USER = 0,
+  SOF_CONSUMER_AUDIO,
+} sof_consumer_t;
+
 //--------------------------------------------------------------------+
 // Class Driver API
 //--------------------------------------------------------------------+
@@ -108,7 +117,7 @@ bool usbd_edpt_ready(uint8_t rhport, uint8_t ep_addr) {
 }
 
 // Enable SOF interrupt
-void usbd_sof_enable(uint8_t rhport, bool en);
+void usbd_sof_enable(uint8_t rhport, sof_consumer_t consumer, bool en);
 
 /*------------------------------------------------------------------*/
 /* Helper