Question

我正在尝试使用STM32F4发现板作为主设备，使用I2C与传感器进行通信。我正在使用std periph库来执行此操作但由于某种原因，我无法通过SCL和SDA行获取任何内容。从阅读stf periph头文件和我在网上看到的其他例子来看，我似乎没有做错任何事情或忘记了一步。下面我已经包含了我的所有I2C代码：

#define I2CTransmitter       0
#define I2CReciever          1
#define I2CAckEnable         1
#define I2CAckDisable        0

void I2CInit() {
    I2C_InitTypeDef I2CInitStruct;
    GPIO_InitTypeDef  GPIO;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOB, ENABLE);

    //Configure and initialize the GPIOs
    GPIO.GPIO_Pin = GPIO_Pin_6;
    GPIO.GPIO_Mode = GPIO_Mode_AF;
    GPIO.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO.GPIO_OType = GPIO_OType_OD;
    GPIO.GPIO_PuPd  = GPIO_PuPd_UP;
    GPIO_Init(GPIOB, &GPIO);

    GPIO.GPIO_Pin = GPIO_Pin_7;
    GPIO_Init(GPIOB, &GPIO);

    //Connect GPIO pins to peripheral
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1);

    I2CInitStruct.I2C_ClockSpeed = 100000;
    I2CInitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2CInitStruct.I2C_Mode = I2C_Mode_I2C;
    I2CInitStruct.I2C_OwnAddress1 = 0x00;
    I2CInitStruct.I2C_Ack = I2C_Ack_Enable;
    I2CInitStruct.I2C_DutyCycle = I2C_DutyCycle_2;

    I2C_Init(I2C1, &I2CInitStruct);

    I2C_Cmd(I2C1, ENABLE);
}

uint8_t I2CRead(uint8_t address, uint8_t reg) {
    uint8_t data;
    I2CStart(address, I2CTransmitter, I2CAckEnable);
    I2CWriteData(reg);
    I2CStart(address, I2CReciever, I2CAckDisable);
    data = I2CReadNAck();
    I2CStop();
    return data;
}

void I2CWrite(uint8_t address, uint8_t reg, uint8_t data) {
    I2CStart(address, I2CTransmitter, I2CAckEnable);
    I2CWriteData(reg);
    I2CWriteData(data);
    I2CStop();
}

void I2CStart(uint8_t address, uint8_t direction, uint8_t ack) {
    I2C_GenerateSTART(I2C1, ENABLE);
    I2C_Send7bitAddress(I2C1, address, direction);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_SLAVE_BYTE_RECEIVED));
}

void I2CStop() {
    I2C_GenerateSTOP(I2C1, ENABLE);
}

void I2CWriteData(uint8_t data) {
    I2C_SendData(I2C1, data);
    while(!I2C_CheckEvent(I2C1, I2C_EVENT_SLAVE_BYTE_RECEIVED));
}

uint8_t I2CReadAck() {
    uint8_t data;

    I2C_AcknowledgeConfig(I2C1, ENABLE);
    while( !I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED) );
    data = I2C_ReceiveData(I2C1);
    return data;
}

uint8_t I2CReadNAck() {
    uint8_t data;
    I2C_AcknowledgeConfig(I2C1, DISABLE);
    I2C_GenerateSTOP(I2C1, ENABLE);
    while( !I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED) );
    data = I2C_ReceiveData(I2C1);
    return data;
}

代码在main函数中使用，只需调用I2CInit（）然后在while循环中调用I2CWrite（）进行测试。预先感谢您的任何帮助！

STM32F4发现板作为I2C主站 - 无法通过SCL和SDA线获得任何内容

0 个答案: