stm32控制adxl345模块

要控制ADXL345模块，需要使用STM32的SPI接口与该模块进行通信。下面是一些基本的步骤：

1. 确定STM32的SPI接口引脚，包括SCK、MISO、MOSI和CS。
2. 初始化SPI接口，并设置ADXL345的通信参数，如时钟频率、数据位数等。
3. 通过SPI接口向ADXL345发送控制命令，以实现读取或写入寄存器的操作。
4. 读取ADXL345的数据寄存器，获取加速度传感器的数据。

以下是一个简单的例子代码，可以帮助你了解如何控制ADXL345模块：

#include "stm32f10x.h"
#include "spi.h"

#define ADXL345_CS_PIN GPIO_Pin_3
#define ADXL345_CS_GPIO GPIOA

void ADXL345_Init(void)
{
    // 初始化SPI接口
    SPI_InitTypeDef SPI_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

    // 配置SPI接口引脚
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = ADXL345_CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(ADXL345_CS_GPIO, &GPIO_InitStructure);

    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_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);

    GPIO_SetBits(ADXL345_CS_GPIO, ADXL345_CS_PIN);
}

uint8_t ADXL345_ReadReg(uint8_t reg)
{
    GPIO_ResetBits(ADXL345_CS_GPIO, ADXL345_CS_PIN); // 使能片选

    uint8_t tx_data[2] = { reg | 0x80, 0 };
    uint8_t rx_data[2] = { 0, 0 };

    SPI_I2S_SendData(SPI1, tx_data[0]);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    rx_data[0] = SPI_I2S_ReceiveData(SPI1);

    SPI_I2S_SendData(SPI1, tx_data[1]);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    rx_data[1] = SPI_I2S_ReceiveData(SPI1);

    GPIO_SetBits(ADXL345_CS_GPIO, ADXL345_CS_PIN); // 禁用片选

    return rx_data[1];
}

void ADXL345_WriteReg(uint8_t reg, uint8_t val)
{
    GPIO_ResetBits(ADXL345_CS_GPIO, ADXL345_CS_PIN); // 使能片选

    uint8_t tx_data[2] = { reg, val };

    SPI_I2S_SendData(SPI1, tx_data[0]);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    SPI_I2S_ReceiveData(SPI1);

    SPI_I2S_SendData(SPI1, tx_data[1]);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    SPI_I2S_ReceiveData(SPI1);

    GPIO_SetBits(ADXL345_CS_GPIO, ADXL345_CS_PIN); // 禁用片选
}

int16_t ADXL345_ReadAccelX(void)
{
    uint8_t low_byte = ADXL345_ReadReg(0x32);
    uint8_t high_byte = ADXL345_ReadReg(0x33);

    int16_t accel_x = (high_byte << 8) | low_byte;

    return accel_x;
}

int16_t ADXL345_ReadAccelY(void)
{
    uint8_t low_byte = ADXL345_ReadReg(0x34);
    uint8_t high_byte = ADXL345_ReadReg(0x35);

    int16_t accel_y = (high_byte << 8) | low_byte;

    return accel_y;
}

int16_t ADXL345_ReadAccelZ(void)
{
    uint8_t low_byte = ADXL345_ReadReg(0x36);
    uint8_t high_byte = ADXL345_ReadReg(0x37);

    int16_t accel_z = (high_byte << 8) | low_byte;

    return accel_z;
}

int main(void)
{
    ADXL345_Init();

    while (1)
    {
        int16_t accel_x = ADXL345_ReadAccelX();
        int16_t accel_y = ADXL345_ReadAccelY();
        int16_t accel_z = ADXL345_ReadAccelZ();

        // 处理加速度传感器的数据
    }
}

在这个例子中，我们定义了ADXL345模块的片选引脚为PA3，通过SPI接口读写ADXL345的寄存器。我们提供了一些基本的函数，例如初始化SPI接口、读取和写入寄存器以及读取加速度传感器的数据。在主函数中，我们可以通过调用这些函数来读取加速度传感器的数据并进行处理。