STM32F4Discovery HAL之UART通信

前言

STM32F4Discovery开发板，由于PA9复用成了USB OTG的vbus，线路上有电容，导致不能正常用作UART。
UART1不仅仅适用PA9和PA10，也可以使用PB6，PB7
STM32F4Discovery USART1 PA9不能使用.

环境

硬件

STM32F4Discovery

软件

STM32CubeMX V6.2.1

配置

配置UART1_TX跟UART1_RX口为PB6，PB7

代码

函数说明

发送函数：HAL_UART_Transmit(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout)
接收函数：HAL_UART_Receive(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout)

代码实例

if (HAL_UART_Receive(&huart1, rx_buff, sizeof(rx_buff),1000) == HAL_OK)
    {
        switch(rx_buff[0]){
            case 0xA1:
                set_voltage(DAC_CHANNEL_1, rx_buff[1]<<8 | rx_buff[2]);
                get_voltage(DAC_CHANNEL_1);
                HAL_UART_Transmit(&huart1, (uint8_t *)tx_buff, 2, 100);
                break;
            case 0xA2:
                set_voltage(DAC_CHANNEL_2, rx_buff[1]<<8 | rx_buff[2]);
                get_voltage(DAC_CHANNEL_2);
                HAL_UART_Transmit(&huart1, (uint8_t *)tx_buff, 2, 100);
                break;
            case 0xB1:
                get_voltage(DAC_CHANNEL_1);
                HAL_UART_Transmit(&huart1, (uint8_t *)tx_buff, 2, 100);
                break;
            case 0xB2:
                get_voltage(DAC_CHANNEL_2);
                HAL_UART_Transmit(&huart1, (uint8_t *)tx_buff, 2, 100);
                break;
            default:
                HAL_UART_Transmit(&huart1, rx_buff, sizeof(rx_buff),100);
                
                break;
        }
    }

输出结果示例

20210809 追加

STM32G474 UART相关

串口发送16位数据

    uint8_t high, low;
    high = (uint8_t)data >> 8;
    low = (uint8_t)data & 0xFF;
    HAL_UART_Transmit(&huart4, (uint8_t *)&high, 1,1000);
    HAL_UART_Transmit(&huart4, (uint8_t *)&low, 1,1000);

串口发送32位数据

    int32_t MotorEncoder;
    uint8_t code[4];
    code[0]=(uint8_t)(MotorEncoder>>24);
    code[1]=(uint8_t)(MotorEncoder>>18&0xFF);
    code[2]=(uint8_t)(MotorEncoder>>12&0xFF);
    code[3]=(uint8_t)(MotorEncoder&0xFF);
    HAL_UART_Transmit(&huart1 , code, 4, 0xff);

串口接收16位数据

    data[2]<<8|data[3];

STM32调试相关

keil 提示 cannot load falsh programming algorithm!