add esp32s2 saola bsp

update cdc_msc_freertos main.c to work with esp32s2
add CMake file

examples/device/cdc_msc_freertos/CMakeLists.txt

@@ -0,0 +1,10 @@
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+# example src directory
+set(EXTRA_COMPONENT_DIRS "src")
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+project(blink)

examples/device/cdc_msc_freertos/src/CMakeLists.txt

@@ -0,0 +1,36 @@
+# TOP is absolute path to root directory of TinyUSB git repo
+set(TOP "../../../..")
+get_filename_component(TOP "${TOP}" REALPATH)
+
+idf_component_register(SRCS "main.c" "usb_descriptors.c" "msc_disk.c"
+                    INCLUDE_DIRS "."
+                    REQUIRES freertos soc)
+                    
+target_compile_options(${COMPONENT_TARGET} PUBLIC
+  "-DCFG_TUSB_MCU=OPT_MCU_ESP32S2"
+)
+
+idf_component_get_property( FREERTOS_ORIG_INCLUDE_PATH freertos ORIG_INCLUDE_PATH)
+target_include_directories(${COMPONENT_TARGET} PUBLIC
+  "${FREERTOS_ORIG_INCLUDE_PATH}"
+  "${TOP}/hw"
+  "${TOP}/src"
+)
+
+target_sources(${COMPONENT_TARGET} PUBLIC
+  "${TOP}/hw/bsp/esp32s2_saola/esp32s2_saola.c"
+  "${TOP}/src/tusb.c"
+  "${TOP}/src/common/tusb_fifo.c"
+  "${TOP}/src/device/usbd.c"
+  "${TOP}/src/device/usbd_control.c"
+  "${TOP}/src/class/cdc/cdc_device.c"
+  "${TOP}/src/class/dfu/dfu_rt_device.c"
+  "${TOP}/src/class/hid/hid_device.c"
+  "${TOP}/src/class/midi/midi_device.c"
+  "${TOP}/src/class/msc/msc_device.c"
+  "${TOP}/src/class/net/net_device.c"
+  "${TOP}/src/class/usbtmc/usbtmc_device.c"
+  "${TOP}/src/class/vendor/vendor_device.c"
+  "${TOP}/src/portable/espressif/esp32s2/dcd_esp32s2.c"
+)
+

examples/device/cdc_msc_freertos/src/main.c

@@ -56,12 +56,12 @@ StaticTimer_t static_blink;
 TimerHandle_t blink_tm;
 
 // static task for usbd
-#define USBD_STACK_SIZE     (3*(configMINIMAL_STACK_SIZE/2))
+#define USBD_STACK_SIZE     (2*configMINIMAL_STACK_SIZE)
 StackType_t  stack_usbd[USBD_STACK_SIZE];
 StaticTask_t static_task_usbd;
 
 // static task for cdc
-#define CDC_STACK_SZIE      configMINIMAL_STACK_SIZE
+#define CDC_STACK_SZIE      (2*configMINIMAL_STACK_SIZE)
 StackType_t  stack_cdc[CDC_STACK_SZIE];
 StaticTask_t static_task_cdc;
 
@@ -72,11 +72,10 @@ void cdc_task(void* params);
 
 /*------------- MAIN -------------*/
 #if CFG_TUSB_MCU == OPT_MCU_ESP32S2
-// ESP32S2 entry function is app_main()
-#define main    app_main
-#endif
-
+void app_main(void)
+#else
 int main(void)
+#endif
 {
   board_init();
 
@@ -91,21 +90,16 @@ int main(void)
 
   // Create task
 #if CFG_TUD_CDC
-  (void) xTaskCreateStatic( cdc_task, "cdc", CDC_STACK_SZIE, NULL, configMAX_PRIORITIES-2, stack_cdc, &static_task_cdc);
+  (void) xTaskCreateStatic( cdc_task, "cdc", CDC_STACK_SZIE, NULL, configMAX_PRIORITIES-1, stack_cdc, &static_task_cdc);
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_ESP32S2
-  // skip starting scheduler for ESP32 S2 (already started)
-  while(1)
-  {
-    vTaskSuspend(NULL);
-  }
-#else
+  // skip starting scheduler (and return) for ESP32-S2
+#if CFG_TUSB_MCU != OPT_MCU_ESP32S2
   vTaskStartScheduler();
   NVIC_SystemReset();
+  return 0;
 #endif
 
-  return 0;
 }
 
 // USB Device Driver task
@@ -186,7 +180,8 @@ void cdc_task(void* params)
       }
     }
 
-    taskYIELD();
+    // For ESP32-S2 this delay is essential to allow idle how to run and reset wdt
+    vTaskDelay(pdMS_TO_TICKS(10));
   }
 }