stm32通讯协议代码

针对不同的通讯协议，STM32的代码实现也会有所不同。以下是常见的几种通讯协议的代码实现：

1. SPI通讯协议代码示例：

#include "stm32f10x.h"

#define SPI_PORT GPIOA
#define SPI_NSS GPIO_Pin_4
#define SPI_SCK GPIO_Pin_5
#define SPI_MISO GPIO_Pin_6
#define SPI_MOSI GPIO_Pin_7

void spi_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = SPI_NSS | SPI_SCK | SPI_MISO | SPI_MOSI;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(SPI_PORT, &GPIO_InitStructure);

    SPI_InitTypeDef SPI_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);
}

uint8_t spi_transfer(uint8_t data)
{
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

    SPI_I2S_SendData(SPI1, data);

    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

    return SPI_I2S_ReceiveData(SPI1);
}

2. I2C通讯协议代码示例：

#include "stm32f10x.h"

#define I2C_PORT GPIOB
#define I2C_SCL GPIO_Pin_6
#define I2C_SDA GPIO_Pin_7

void i2c_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Pin = I2C_SCL | I2C_SDA;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_Init(I2C_PORT, &GPIO_InitStructure);

    I2C_InitTypeDef I2C_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0x00;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 100000;
    I2C_Init(I2C1, &I2C_InitStructure);

    I2C_Cmd(I2C1, ENABLE);
}

void i2c_start(void)
{
    I2C_GenerateSTART(I2C1, ENABLE);

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
}

void i2c_stop(void)
{
    I2C_GenerateSTOP(I2C1, ENABLE);
}

void i2c_write(uint8_t data)
{
    I2C_SendData(I2C1, data);

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}

uint8_t i2c_read_ack(void)
{
    I2C_AcknowledgeConfig(I2C1, ENABLE);

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));

    return I2C_ReceiveData(I2C1);
}

uint8_t i2c_read_nack(void)
{
    I2C_AcknowledgeConfig(I2C1, DISABLE);

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));

    return I2C_ReceiveData(I2C1);
}

3. UART通讯协议代码示例：

#include "stm32f10x.h"

#define UART_PORT GPIOA
#define UART_TX GPIO_Pin_9
#define UART_RX GPIO_Pin_10

void uart_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = UART_TX;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(UART_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = UART_RX;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(UART_PORT, &GPIO_InitStructure);

    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

    USART_InitStructure.USART_BaudRate = 9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStructure);

    USART_Cmd(USART1, ENABLE);
}

void uart_send(uint8_t data)
{
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);

    USART_SendData(USART1, data);
}

uint8_t uart_receive(void)
{
    while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);

    return USART_ReceiveData(USART1);
}

以上代码仅供参考，具体实现需要根据具体的硬件和通讯协议进行调整。