用stm32f407写一个串口通信代码

你可以参考这篇文章：https://blog.csdn.net/wklken/article/details/84499414，它介绍了如何使用STM32F407写一个串口通信代码。希望这能帮到你。

相关问题

STM32F407基于官方库串口通信代码

以下是基于官方库实现的 STM32F407 的串口通信代码，以 USART1 为例：

#include "stm32f4xx.h"
#include <stdio.h>

#define USARTx                           USART1
#define USARTx_CLK                       RCC_APB2Periph_USART1
#define USARTx_CLK_INIT                  RCC_APB2PeriphClockCmd
#define USARTx_IRQn                      USART1_IRQn
#define USARTx_IRQHandler                USART1_IRQHandler

#define USARTx_TX_PIN                    GPIO_Pin_9                
#define USARTx_TX_GPIO_PORT              GPIOA                       
#define USARTx_TX_GPIO_CLK               RCC_AHB1Periph_GPIOA
#define USARTx_TX_SOURCE                 GPIO_PinSource9
#define USARTx_TX_AF                     GPIO_AF_USART1

#define USARTx_RX_PIN                    GPIO_Pin_10                
#define USARTx_RX_GPIO_PORT              GPIOA                    
#define USARTx_RX_GPIO_CLK               RCC_AHB1Periph_GPIOA
#define USARTx_RX_SOURCE                 GPIO_PinSource10
#define USARTx_RX_AF                     GPIO_AF_USART1

GPIO_InitTypeDef GPIO_InitStruct;
USART_InitTypeDef USART_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;

void USARTx_Config(void)
{
  USARTx_CLK_INIT(USARTx_CLK, ENABLE);

  GPIO_InitStruct.GPIO_Pin = USARTx_TX_PIN;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct);

  GPIO_InitStruct.GPIO_Pin = USARTx_RX_PIN;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStruct);

  GPIO_PinAFConfig(USARTx_TX_GPIO_PORT, USARTx_TX_SOURCE, USARTx_TX_AF);
  GPIO_PinAFConfig(USARTx_RX_GPIO_PORT, USARTx_RX_SOURCE, USARTx_RX_AF);

  USART_InitStruct.USART_BaudRate = 115200;
  USART_InitStruct.USART_WordLength = USART_WordLength_8b;
  USART_InitStruct.USART_StopBits = USART_StopBits_1;
  USART_InitStruct.USART_Parity = USART_Parity_No;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(USARTx, &USART_InitStruct);

  USART_Cmd(USARTx, ENABLE);

  NVIC_InitStruct.NVIC_IRQChannel = USARTx_IRQn;
  NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStruct);

  USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE);
}

void USARTx_IRQHandler(void)
{
  if (USART_GetITStatus(USARTx, USART_IT_RXNE) != RESET)
  {
    char data = USART_ReceiveData(USARTx);
    USART_SendData(USARTx, data);
    while (USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);
  }
}

int main(void)
{
  USARTx_Config();

  while (1)
  {
  }
}

这段代码首先定义了一些宏和变量，然后定义了 USARTx_Config 函数，该函数用于初始化 USART1 的相关配置，包括 GPIO 和 USART 的配置。在中断处理函数 USARTx_IRQHandler 中，当 USART1 接收到数据时，将该数据发送回去，以实现回显功能。在主函数中，只是一个空循环。

使用stm32f407写一个mlx90614的代码

以下是使用 STM32F407 写的 MLX90614 代码：

#include "stm32f4xx.h"
#include "stdio.h"
#include "stdlib.h"
#include "string.h"

#define I2C_TIMEOUT 10000

#define MLX90614_I2C_ADDRESS 0x5A << 1

#define MLX90614_TA 0x06
#define MLX90614_TOBJ1 0x07
#define MLX90614_TOBJ2 0x08

I2C_HandleTypeDef hi2c1;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
void MX_USART2_UART_Init(void);

void I2C_WriteByte(uint8_t DevAddress, uint8_t RegAddress, uint8_t data)
{
    HAL_StatusTypeDef status;

    status = HAL_I2C_Mem_Write(&hi2c1, DevAddress, RegAddress, I2C_MEMADD_SIZE_8BIT, &data, 1, I2C_TIMEOUT);

    if (status != HAL_OK)
    {
        printf("Error: %d\n", status);
    }
}

uint8_t I2C_ReadByte(uint8_t DevAddress, uint8_t RegAddress)
{
    uint8_t data;
    HAL_StatusTypeDef status;

    status = HAL_I2C_Mem_Read(&hi2c1, DevAddress, RegAddress, I2C_MEMADD_SIZE_8BIT, &data, 1, I2C_TIMEOUT);

    if (status != HAL_OK)
    {
        printf("Error: %d\n", status);
    }

    return data;
}

int main(void)
{
    HAL_Init();
    SystemClock_Config();

    MX_GPIO_Init();
    MX_I2C1_Init();
    MX_USART2_UART_Init();

    uint8_t data[3];
    float temp;

    while (1)
    {
        data[0] = I2C_ReadByte(MLX90614_I2C_ADDRESS, MLX90614_TA);
        data[1] = I2C_ReadByte(MLX90614_I2C_ADDRESS, MLX90614_TOBJ1);
        data[2] = I2C_ReadByte(MLX90614_I2C_ADDRESS, MLX90614_TOBJ2);

        temp = (float)data[0] * 0.02 - 273.15;
        printf("TA: %.2f\n", temp);

        temp = (float)(data[1] | data[2] << 8) * 0.02 - 273.15;
        printf("TOBJ1: %.2f\n", temp);

        HAL_Delay(1000);
    }
}

void SystemClock_Config(void)
{
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    /** Configure the main internal regulator output voltage 
    */
    __HAL_RCC_PWR_CLK_ENABLE();
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
    /** Initializes the CPU, AHB and APB busses clocks 
    */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLM = 25;
    RCC_OscInitStruct.PLL.PLLN = 336;
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    RCC_OscInitStruct.PLL.PLLQ = 7;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    {
        Error_Handler();
    }
    /** Initializes the CPU, AHB and APB busses clocks 
    */
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
    {
        Error_Handler();
    }
}

static void MX_I2C1_Init(void)
{

    hi2c1.Instance = I2C1;
    hi2c1.Init.ClockSpeed = 100000;
    hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
    hi2c1.Init.OwnAddress1 = 0;
    hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
    hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
    hi2c1.Init.OwnAddress2 = 0;
    hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
    hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
    if (HAL_I2C_Init(&hi2c1) != HAL_OK)
    {
        Error_Handler();
    }
}

void MX_USART2_UART_Init(void)
{

    huart2.Instance = USART2;
    huart2.Init.BaudRate = 115200;
    huart2.Init.WordLength = UART_WORDLENGTH_8B;
    huart2.Init.StopBits = UART_STOPBITS_1;
    huart2.Init.Parity = UART_PARITY_NONE;
    huart2.Init.Mode = UART_MODE_TX_RX;
    huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    huart2.Init.OverSampling = UART_OVERSAMPLING_16;
    if (HAL_UART_Init(&huart2) != HAL_OK)
    {
        Error_Handler();
    }
}

static void MX_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    __HAL_RCC_GPIOA_CLK_ENABLE();

    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);

    GPIO_InitStruct.Pin = GPIO_PIN_0;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

void Error_Handler(void)
{
    __disable_irq();
    while (1)
    {
    }
}

该代码通过 I2C 总线与 MLX90614 通信，读取温度数据并打印至串口。代码中使用了 HAL 库进行 I2C 和串口的初始化和读写操作。注意在使用之前需要先初始化 I2C 和串口，并发送地址和命令来读取数据。