freeRtos seems to work well with nrf52840

examples/device/nrf52840_freertos/src/main.c

@@ -61,8 +61,8 @@
 //--------------------------------------------------------------------+
 void print_greeting(void);
 void led_blinky_cb(TimerHandle_t xTimer);
-void virtual_com_task(void);
-void usb_hid_task(void);
+void cdc_task(void* params);
+void usb_hid_task(void* params);
 
 
 /*------------- MAIN -------------*/
@@ -71,49 +71,54 @@ int main(void)
   board_init();
   print_greeting();
 
-  //tusb_init();
-
   // soft timer for blinky
   TimerHandle_t tm_hdl = xTimerCreate(NULL, pdMS_TO_TICKS(1000), true, NULL, led_blinky_cb);
-  xTimerStart(tm_hdl, 0); 
+  xTimerStart(tm_hdl, 0);
+
+  tusb_init();
+
+  // Create task
+  xTaskCreate( cdc_task, "cdc", 256, NULL, 2, NULL);
 
   vTaskStartScheduler();
 
   NVIC_SystemReset();
 
-//  while (1)
-//  {
-//    virtual_com_task();
-//
-//    usb_hid_task();
-//  }
-
   return 0;
 }
 
 //--------------------------------------------------------------------+
 // USB CDC
 //--------------------------------------------------------------------+
-void virtual_com_task(void)
+void cdc_task(void* params)
 {
-  // connected and there are data available
-  if ( tud_mounted() && tud_cdc_available() )
+  (void) params;
+
+  while ( 1 )
   {
-    uint8_t buf[64];
+    // connected and there are data available
+    if ( tud_mounted() && tud_cdc_available() )
+    {
+      uint8_t buf[64];
+
+      // read and echo back
+      uint32_t count = tud_cdc_read(buf, sizeof(buf));
 
-    // read and echo back
-    uint32_t count = tud_cdc_read(buf, sizeof(buf));
+      tud_cdc_write(buf, count);
+      tud_cdc_write_flush();
+    }
 
-    tud_cdc_write(buf, count);
-    tud_cdc_write_flush();
+    taskYIELD();
   }
 }
 
 //--------------------------------------------------------------------+
 // USB HID
 //--------------------------------------------------------------------+
-void usb_hid_task(void)
+void usb_hid_task(void* params)
 {
+  (void) params;
+
   // Poll every 10ms
   static tu_timeout_t tm = { .start = 0, .interval = 10 };
 

examples/device/nrf52840_freertos/src/tusb_config.h

@@ -53,7 +53,7 @@
 
 /*------------- RTOS -------------*/
 #define CFG_TUSB_OS                 OPT_OS_FREERTOS
-#define CFG_TUD_TASK_PRIO           (configMAX_PRIORITIES-2)
+#define CFG_TUD_TASK_PRIO           (configMAX_PRIORITIES-3)
 //#define CFG_TUD_TASK_QUEUE_SZ     16
 //#define CFG_TUD_TASK_STACK_SZ     150
 

lib/FreeRTOS/FreeRTOSConfig.h

@@ -20,7 +20,7 @@
 #define configUSE_PREEMPTION                    1
 #define configUSE_PORT_OPTIMISED_TASK_SELECTION 0
 #define configTICK_RATE_HZ                      ( 1000 )
-#define configMAX_PRIORITIES                    (8 )
+#define configMAX_PRIORITIES                    (5)
 #define configMINIMAL_STACK_SIZE                (128 )
 #define configTOTAL_HEAP_SIZE                   ( ( size_t ) ( 16*1024 ) )
 #define configMAX_TASK_NAME_LEN                 32