Merge pull request #301 from ccrome/imxrt-allow-per-board-init

Allow per-board custom init, teardown, and validate hooks

src/board_api.h

@@ -81,10 +81,17 @@
 // This API does not init usb which is only init if DFU is entered
 void board_init(void);
 
+// board_init2 is the same as board_init, but allows custom boards
+// to have a chance at board_init without modifying the boards.c file.
+void board_init2(void) __attribute__ ((weak));
+
 // opposite to board_init(), reset all board peripherals. Is called before jumping to application
 // TODO force this API in the future
 void board_teardown(void) __attribute__ ((weak));
 
+// board_teardown2() is called immeidately after board_init()
+void board_teardown2(void) __attribute__ ((weak));
+
 // Reset board, not return
 void board_reset(void);
 
@@ -112,6 +119,9 @@ extern void board_timer_handler(void);
 // Check if application is valid
 bool board_app_valid(void);
 
+// Additional check if application is valid for custom board.
+bool board_app_valid2(void) __attribute__ ((weak));
+
 // Jump to Application
 void board_app_jump(void);
 

src/main.c

@@ -63,6 +63,7 @@ static bool check_dfu_mode(void);
 int main(void)
 {
  board_init();
+ if (board_init2) board_init2();
  TU_LOG1("TinyUF2\r\n");
 
 #if TINYUF2_PROTECT_BOOTLOADER
@@ -74,6 +75,7 @@ int main(void)
  {
  TU_LOG1("Jump to application\r\n");
  if (board_teardown) board_teardown();
+ if (board_teardown2) board_teardown2();
  board_app_jump();
  while(1) {}
  }
@@ -122,6 +124,7 @@ static bool check_dfu_mode(void)
 
  // Check if app is valid
  if ( !board_app_valid() ) return true;
+ if ( board_app_valid2 && !board_app_valid2() ) return true;
 
 #if TINYUF2_DFU_DOUBLE_TAP
 // TU_LOG1_HEX(DBL_TAP_REG);