stm32/main: Start UART REPL as early as possible.

For debugging purposes, to see output from other peripherals. Also reset the pyb_stdio_uart state at the end of soft reset, in case it points to a heap-allocated object. Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

ports/stm32/main.c

@@ -411,6 +411,21 @@ void stm32_main(uint32_t reset_mode) {
  rtc_init_start(false);
  #endif
  uart_init0();
+
+ #if defined(MICROPY_HW_UART_REPL)
+ // Set up a UART REPL using a statically allocated object
+ pyb_uart_repl_obj.base.type = &pyb_uart_type;
+ pyb_uart_repl_obj.uart_id = MICROPY_HW_UART_REPL;
+ pyb_uart_repl_obj.is_static = true;
+ pyb_uart_repl_obj.timeout = 0;
+ pyb_uart_repl_obj.timeout_char = 2;
+ uart_init(&pyb_uart_repl_obj, MICROPY_HW_UART_REPL_BAUD, UART_WORDLENGTH_8B, UART_PARITY_NONE, UART_STOPBITS_1, 0);
+ uart_set_rxbuf(&pyb_uart_repl_obj, sizeof(pyb_uart_repl_rxbuf), pyb_uart_repl_rxbuf);
+ uart_attach_to_repl(&pyb_uart_repl_obj, true);
+ MP_STATE_PORT(pyb_uart_obj_all)[MICROPY_HW_UART_REPL - 1] = &pyb_uart_repl_obj;
+ MP_STATE_PORT(pyb_stdio_uart) = &pyb_uart_repl_obj;
+ #endif
+
  spi_init0();
  #if MICROPY_PY_PYB_LEGACY && MICROPY_HW_ENABLE_HW_I2C
  i2c_init0();
@@ -446,19 +461,6 @@ void stm32_main(uint32_t reset_mode) {
  }
  #endif
 
- #if defined(MICROPY_HW_UART_REPL)
- // Set up a UART REPL using a statically allocated object
- pyb_uart_repl_obj.base.type = &pyb_uart_type;
- pyb_uart_repl_obj.uart_id = MICROPY_HW_UART_REPL;
- pyb_uart_repl_obj.is_static = true;
- pyb_uart_repl_obj.timeout = 0;
- pyb_uart_repl_obj.timeout_char = 2;
- uart_init(&pyb_uart_repl_obj, MICROPY_HW_UART_REPL_BAUD, UART_WORDLENGTH_8B, UART_PARITY_NONE, UART_STOPBITS_1, 0);
- uart_set_rxbuf(&pyb_uart_repl_obj, sizeof(pyb_uart_repl_rxbuf), pyb_uart_repl_rxbuf);
- uart_attach_to_repl(&pyb_uart_repl_obj, true);
- MP_STATE_PORT(pyb_uart_obj_all)[MICROPY_HW_UART_REPL - 1] = &pyb_uart_repl_obj;
- #endif
-
  boardctrl_state_t state;
  state.reset_mode = reset_mode;
  state.log_soft_reset = false;
@@ -496,12 +498,6 @@ void stm32_main(uint32_t reset_mode) {
  // we can run Python scripts (eg boot.py), but anything that is configurable
  // by boot.py must be set after boot.py is run.
 
- #if defined(MICROPY_HW_UART_REPL)
- MP_STATE_PORT(pyb_stdio_uart) = &pyb_uart_repl_obj;
- #else
- MP_STATE_PORT(pyb_stdio_uart) = NULL;
- #endif
-
  readline_init0();
  pin_init0();
  extint_init0();
@@ -659,6 +655,12 @@ void stm32_main(uint32_t reset_mode) {
  pyb_thread_deinit();
  #endif
 
+ #if defined(MICROPY_HW_UART_REPL)
+ MP_STATE_PORT(pyb_stdio_uart) = &pyb_uart_repl_obj;
+ #else
+ MP_STATE_PORT(pyb_stdio_uart) = NULL;
+ #endif
+
  MICROPY_BOARD_END_SOFT_RESET(&state);
 
  gc_sweep_all();