Merge pull request #2211 from hierophect/stm32-uart

STM32: UART support

Author: dhalbert

ports/stm32f4/boards/feather_stm32f405_express/stm32f4xx_hal_conf.h

@@ -63,7 +63,7 @@
 #define HAL_SPI_MODULE_ENABLED
 #define HAL_TIM_MODULE_ENABLED
 #define HAL_UART_MODULE_ENABLED   
-/* #define HAL_USART_MODULE_ENABLED   */
+#define HAL_USART_MODULE_ENABLED
 /* #define HAL_IRDA_MODULE_ENABLED   */
 /* #define HAL_SMARTCARD_MODULE_ENABLED   */
 /* #define HAL_WWDG_MODULE_ENABLED   */

ports/stm32f4/boards/stm32f412zg_discovery/mpconfigboard.mk

@@ -2,6 +2,7 @@ USB_VID = 0x239A
 USB_PID = 0x8056
 USB_PRODUCT = "STM32F412ZG Discovery Board - CPy"
 USB_MANUFACTURER = "STMicroelectronics"
+USB_DEVICES = "CDC,MSC,HID"
 
 INTERNAL_FLASH_FILESYSTEM = 1
 LONGINT_IMPL = NONE

ports/stm32f4/boards/stm32f412zg_discovery/pins.c

@@ -74,8 +74,8 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
   { MP_ROM_QSTR(MP_QSTR_D4), MP_ROM_PTR(&pin_PG12) },
   { MP_ROM_QSTR(MP_QSTR_D3), MP_ROM_PTR(&pin_PF04) },
   { MP_ROM_QSTR(MP_QSTR_D2), MP_ROM_PTR(&pin_PG13) },
-  { MP_ROM_QSTR(MP_QSTR_D1), MP_ROM_PTR(&pin_PG14) },
-  { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PG09) },
+  { MP_ROM_QSTR(MP_QSTR_D1), MP_ROM_PTR(&pin_PG14) }, //USART6 TX
+  { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PG09) }, //USART6 RX
   { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA01) },
   { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PC01) },
   { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PC03) },