stm32使用ADXL345

ADXL345是一款三轴加速度传感器，可以通过I2C或SPI接口与STM32进行通信。

首先，需要在STM32上配置I2C或SPI接口，并与ADXL345进行连接。接下来，需要编写STM32的程序来读取ADXL345的数据。以下是一个简单的I2C读取ADXL345数据的示例代码：

#include "stm32f10x.h"
#include "stm32f10x_i2c.h"

#define ADXL345_ADDR 0x53

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

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

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

    I2C_DeInit(I2C1);
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0xFE;
    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 ADXL345_ReadData(int16_t *ax,int16_t *ay,int16_t *az)
{
    uint8_t buf[6];
    buf[0] = 0x32;

    I2C_AcknowledgeConfig(I2C1, ENABLE);
    while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));

    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, ADXL345_ADDR << 1, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    I2C_SendData(I2C1, buf[0]);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C1, ADXL345_ADDR << 1, I2C_Direction_Receiver);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
    buf[0] = I2C_ReceiveData(I2C1);
    I2C_AcknowledgeConfig(I2C1, ENABLE);

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
    buf[1] = I2C_ReceiveData(I2C1);
    I2C_AcknowledgeConfig(I2C1, ENABLE);

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
    buf[2] = I2C_ReceiveData(I2C1);
    I2C_AcknowledgeConfig(I2C1, ENABLE);

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
    buf[3] = I2C_ReceiveData(I2C1);
    I2C_AcknowledgeConfig(I2C1, ENABLE);

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
    buf[4] = I2C_ReceiveData(I2C1);
    I2C_AcknowledgeConfig(I2C1, ENABLE);

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
    buf[5] = I2C_ReceiveData(I2C1);
    I2C_AcknowledgeConfig(I2C1, DISABLE);

    I2C_GenerateSTOP(I2C1, ENABLE);

    *ax = (buf[1] << 8) | buf[0];
    *ay = (buf[3] << 8) | buf[2];
    *az = (buf[5] << 8) | buf[4];

    if (*ax & (1 << 15))
        *ax |= ~((1 << 16) - 1);
    if (*ay & (1 << 15))
        *ay |= ~((1 << 16) - 1);
    if (*az & (1 << 15))
        *az |= ~((1 << 16) - 1);
}

int main(void)
{
    int16_t ax, ay, az;

    I2C_Configuration();

    while (1)
    {
        ADXL345_ReadData(&ax, &ay, &az);
        //处理读取到的加速度数据
    }

    return 0;
}

这个示例代码使用了STM32的I2C接口与ADXL345进行通信，并读取ADXL345的加速度数据。你可以根据自己的需要进行修改，并添加适当的处理程序。