2021-02-03 09:53 AM
#include "stm32f4xx_hal.h"
static UART_HandleTypeDef UartHandle;
void Setup( void ) {
GPIO_InitTypeDef GPIO_InitStruct;
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Configure the Systick to generate an interrupt each 1 msec
- Set NVIC Group Priority to 4
- Global MSP (MCU Support Package) initialization
*/
HAL_Init();
SystemClock_Config(); /* Configure the system clock to 180 MHz */
#if 0
// **** THIS WORKS ****
// Nucleo DEBUG = PA2/AF7/USART2
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_2 | GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); // PA2 = TxD2, PA3 = RxD2, AF7
UartHandle.Instance = USART2;
UartHandle.Init.BaudRate = 38400;
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
if(HAL_UART_Init(&UartHandle) != HAL_OK) Error_Handler();
#else
// **** This does NOT work ****
// Display debug = PC10/AF7/USART3
__HAL_RCC_GPIOC_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_10 | GPIO_PIN_11;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF7_USART3;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct); // PC10 = TxD3, PC11 = RxD3, AF7
UartHandle.Instance = USART3;
UartHandle.Init.BaudRate = 38400;
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
if(HAL_UART_Init(&UartHandle) != HAL_OK) Error_Handler();
#endif
}
2021-02-03 10:33 AM
You enable the USART clocks somewhere?
Check the registers, RCC, GPIO and USART..
Still not working check the board, scope the pins.