写一个使用STM32F4标准库版本写的硬件IIC从机DMA代码

以下是一个使用STM32F4标准库版本写的硬件IIC从机DMA代码，可以作为参考：

#include "stm32f4xx.h"

#define I2C_SLAVE_ADDRESS 0x50
#define BUFFER_SIZE 16

volatile uint8_t rxBuffer[BUFFER_SIZE];
volatile uint8_t txBuffer[BUFFER_SIZE];
volatile uint16_t txCount = 0;
volatile uint16_t rxCount = 0;
volatile uint8_t dmaInProgress = 0;

void I2C1_EV_IRQHandler(void)
{
    if(I2C_GetITStatus(I2C1, I2C_IT_EVT) == SET)
    {
        // Check for slave address match
        if(I2C_GetLastEvent(I2C1) == I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED)
        {
            // Clear the ADDR flag 
            I2C_ClearFlag(I2C1, I2C_FLAG_ADDR);
            
            // Enable DMA reception
            DMA_Cmd(DMA1_Stream0, ENABLE);
            
            // Enable DMA1 Stream0 transfer complete interrupt
            DMA_ITConfig(DMA1_Stream0, DMA_IT_TC, ENABLE);
        }
        else if(I2C_GetLastEvent(I2C1) == I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED)
        {
            // Clear the ADDR flag 
            I2C_ClearFlag(I2C1, I2C_FLAG_ADDR);
            
            // Enable DMA transmission
            DMA_Cmd(DMA1_Stream6, ENABLE);
            
            // Enable DMA1 Stream6 transfer complete interrupt
            DMA_ITConfig(DMA1_Stream6, DMA_IT_TC, ENABLE);
        }
    }
    
    I2C_ClearITPendingBit(I2C1, I2C_IT_EVT);
}

void DMA1_Stream0_IRQHandler(void)
{
    if(DMA_GetITStatus(DMA1_Stream0, DMA_IT_TCIF0) == SET)
    {
        // Disable DMA1 Stream0 transfer complete interrupt
        DMA_ITConfig(DMA1_Stream0, DMA_IT_TC, DISABLE);
        
        // Disable DMA reception
        DMA_Cmd(DMA1_Stream0, DISABLE);
        
        // Set the DMA in progress flag
        dmaInProgress = 1;
        
        // Enable I2C ACK
        I2C_AcknowledgeConfig(I2C1, ENABLE);
    }
    
    DMA_ClearITPendingBit(DMA1_Stream0, DMA_IT_TCIF0);
}

void DMA1_Stream6_IRQHandler(void)
{
    if(DMA_GetITStatus(DMA1_Stream6, DMA_IT_TCIF6) == SET)
    {
        // Disable DMA1 Stream6 transfer complete interrupt
        DMA_ITConfig(DMA1_Stream6, DMA_IT_TC, DISABLE);
        
        // Disable DMA transmission
        DMA_Cmd(DMA1_Stream6, DISABLE);
        
        // Set the DMA in progress flag
        dmaInProgress = 1;
        
        // Enable I2C ACK
        I2C_AcknowledgeConfig(I2C1, ENABLE);
    }
    
    DMA_ClearITPendingBit(DMA1_Stream6, DMA_IT_TCIF6);
}

int main(void)
{
    // Initialize I2C1
    I2C_InitTypeDef I2C_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    
    // Enable I2C1 and DMA1 clocks
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
    
    // Configure GPIO pins for I2C1
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    
    // Set GPIO pins to alternate function
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1);
    
    // Initialize I2C1
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = I2C_SLAVE_ADDRESS << 1;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 100000;
    I2C_Init(I2C1, &I2C_InitStructure);
    
    // Enable I2C1
    I2C_Cmd(I2C1, ENABLE);
    
    // Initialize DMA1 Stream0 for reception
    DMA_InitTypeDef DMA_InitStructure;
    DMA_StructInit(&DMA_InitStructure);
    DMA_InitStructure.DMA_Channel = DMA_Channel_1;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&I2C1->DR;
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)rxBuffer;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
    DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
    DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
    DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(DMA1_Stream0, &DMA_InitStructure);
    
    // Initialize DMA1 Stream6 for transmission
    DMA_StructInit(&DMA_InitStructure);
    DMA_InitStructure.DMA_Channel = DMA_Channel_1;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&I2C1->DR;
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)txBuffer;
    DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
    DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
    DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
    DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
    DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(DMA1_Stream6, &DMA_InitStructure);
    
    // Enable DMA1 Stream0 and Stream6 interrupts
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream6_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    
    // Enable I2C1 event interrupt
    NVIC_InitStructure.NVIC_IRQChannel = I2C1_EV_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    
    // Enable I2C1 address match interrupt
    I2C_ITConfig(I2C1, I2C_IT_ADDRI, ENABLE);
    
    while(1)
    {
        if(dmaInProgress)
        {
            // Data transfer complete, reset flags
            dmaInProgress = 0;
            txCount = 0;
            rxCount = 0;
            
            // Process received data
            // ...
        }
    }
}

这个代码使用了STM32F4标准库，并且使用了DMA来进行I2C从机通信。在中断处理程序中，使用了DMA传输完成中断来检测数据传输是否完成，然后处理接收到的数据。注意，在使用DMA传输数据时，需要先启用DMA传输，然后再启用I2C ACK（应答），否则I2C从机将无法正确接收数据。