esp32/main: Add option for a board to hook code into startup sequence.

To do this the board must define MICROPY_BOARD_STARTUP, set
MICROPY_SOURCE_BOARD then define the new start-up code.

For example, in mpconfigboard.h:

    #define MICROPY_BOARD_STARTUP board_startup
    void board_startup(void);

in mpconfigboard.cmake:

    set(MICROPY_SOURCE_BOARD
        ${MICROPY_BOARD_DIR}/board.c
    )

and in a new board.c file in the board directory:

    #include "py/mpconfig.h"

    void board_startup(void) {
        boardctrl_startup();
        // extra custom startup
    }

This follows stm32's boardctrl facilities.

Signed-off-by: Damien George <damien@micropython.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/ports/esp32/main.c b/ports/esp32/main.c
index 2ba613668..ca0ab1488 100644
--- a/ports/esp32/main.c
+++ b/ports/esp32/main.c
@@ -202,12 +202,20 @@ soft_reset_exit:
     goto soft_reset;
 }
 
-void app_main(void) {
+void boardctrl_startup(void) {
     esp_err_t ret = nvs_flash_init();
     if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
         nvs_flash_erase();
         nvs_flash_init();
     }
+}
+
+void app_main(void) {
+    // Hook for a board to run code at start up.
+    // This defaults to initialising NVS.
+    MICROPY_BOARD_STARTUP();
+
+    // Create and transfer control to the MicroPython task.
     xTaskCreatePinnedToCore(mp_task, "mp_task", MP_TASK_STACK_SIZE / sizeof(StackType_t), NULL, MP_TASK_PRIORITY, &mp_main_task_handle, MP_TASK_COREID);
 }