写一个MMA8452和STM32连接的代码

以下是MMA8452和STM32连接的代码，仅供参考：

#include "stm32f10x.h"
#include "stdio.h"

#define MMA8452_ADDRESS                         0x38
#define MMA8452_ID                              0x2A

#define MMA8452_STATUS                          0x00
#define MMA8452_OUT_X_MSB                       0x01
#define MMA8452_WHO_AM_I                        0x0D
#define MMA8452_CTRL_REG1                       0x2A

#define MMA8452_CTRL_REG1_ACTIVE                0x01

#define I2C_SPEED                               100000
#define I2C1_SLAVE_ADDRESS7                     0x3F

GPIO_InitTypeDef GPIO_InitStructure;

void I2C_Configuration(void);
void I2C_StartTransmission(I2C_TypeDef* I2Cx, uint8_t transmissionDirection, uint8_t slaveAddress);
void I2C_WriteData(I2C_TypeDef* I2Cx, uint8_t data);
void I2C_StopTransmission(I2C_TypeDef* I2Cx);
uint8_t I2C_ReadAck(I2C_TypeDef* I2Cx);
uint8_t I2C_ReadNack(I2C_TypeDef* I2Cx);

int main(void)
{
    uint8_t tempData[6];
    uint8_t whoAmI;

    I2C_Configuration();

    I2C_StartTransmission(I2C1, I2C_Direction_Transmitter, MMA8452_ADDRESS);
    I2C_WriteData(I2C1, MMA8452_WHO_AM_I);
    I2C_StopTransmission(I2C1);

    I2C_StartTransmission(I2C1, I2C_Direction_Receiver, MMA8452_ADDRESS);
    whoAmI = I2C_ReadNack(I2C1);
    I2C_StopTransmission(I2C1);

    if (whoAmI != MMA8452_ID) {
        printf("Error: Could not communicate with MMA8452.\n");
        while (1) {}
    }

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    I2C_StartTransmission(I2C1, I2C_Direction_Transmitter, MMA8452_ADDRESS);
    I2C_WriteData(I2C1, MMA8452_CTRL_REG1);
    I2C_WriteData(I2C1, MMA8452_CTRL_REG1_ACTIVE);
    I2C_StopTransmission(I2C1);

    while (1) {
        I2C_StartTransmission(I2C1, I2C_Direction_Transmitter, MMA8452_ADDRESS);
        I2C_WriteData(I2C1, MMA8452_OUT_X_MSB);
        I2C_StopTransmission(I2C1);

        I2C_StartTransmission(I2C1, I2C_Direction_Receiver, MMA8452_ADDRESS);
        tempData[0] = I2C_ReadAck(I2C1);
        tempData[1] = I2C_ReadAck(I2C1);
        tempData[2] = I2C_ReadAck(I2C1);
        tempData[3] = I2C_ReadAck(I2C1);
        tempData[4] = I2C_ReadAck(I2C1);
        tempData[5] = I2C_ReadNack(I2C1);
        I2C_StopTransmission(I2C1);

        int16_t xData = ((tempData[0] << 8) | tempData[1]) >> 2;
        int16_t yData = ((tempData[2] << 8) | tempData[3]) >> 2;
        int16_t zData = ((tempData[4] << 8) | tempData[5]) >> 2;

        printf("X: %d, Y: %d, Z: %d\n", xData, yData, zData);

        if (xData > 1000) {
            GPIO_SetBits(GPIOC, GPIO_Pin_13);
        } else {
            GPIO_ResetBits(GPIOC, GPIO_Pin_13);
        }
    }
}

void I2C_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    I2C_InitTypeDef I2C_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;
    I2C_Init(I2C1, &I2C_InitStructure);

    I2C_Cmd(I2C1, ENABLE);
}

void I2C_StartTransmission(I2C_TypeDef* I2Cx, uint8_t transmissionDirection, uint8_t slaveAddress)
{
    while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));

    I2C_GenerateSTART(I2Cx, ENABLE);

    while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2Cx, slaveAddress, transmissionDirection);

    if (transmissionDirection == I2C_Direction_Transmitter) {
        while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
    }
    if (transmissionDirection == I2C_Direction_Receiver) {
        while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
    }
}

void I2C_WriteData(I2C_TypeDef* I2Cx, uint8_t data)
{
    I2C_SendData(I2Cx, data);
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}

void I2C_StopTransmission(I2C_TypeDef* I2Cx)
{
    I2C_GenerateSTOP(I2Cx, ENABLE);
}

uint8_t I2C_ReadAck(I2C_TypeDef* I2Cx)
{
    I2C_AcknowledgeConfig(I2Cx, ENABLE);
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED));
    return I2C_ReceiveData(I2Cx);
}

uint8_t I2C_ReadNack(I2C_TypeDef* I2Cx)
{
    I2C_AcknowledgeConfig(I2Cx, DISABLE);
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED));
    return I2C_ReceiveData(I2Cx);
}

该代码使用STM32的I2C接口与MMA8452进行通信。在主循环中，它从MMA8452读取加速度数据，并根据X轴的值控制PC13引脚的状态。