stm32f103控制ad7175-2代码

以下是基于STM32F103的SPI接口控制AD7175-2的示例代码，仅供参考：

#include "stm32f10x.h"

#define AD7175_CS_PIN GPIO_Pin_4
#define AD7175_CS_PORT GPIOA

void AD7175_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef SPI_InitStructure;

    /* 配置AD7175的片选引脚 */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = AD7175_CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(AD7175_CS_PORT, &GPIO_InitStructure);
    GPIO_SetBits(AD7175_CS_PORT, AD7175_CS_PIN);

    /* 配置SPI接口 */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
    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);
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);
    SPI_Cmd(SPI1, ENABLE);
}

uint16_t AD7175_ReadRegister(uint8_t reg)
{
    uint16_t data;

    /* 先将片选拉低 */
    GPIO_ResetBits(AD7175_CS_PORT, AD7175_CS_PIN);

    /* 发送读取寄存器的命令 */
    SPI_I2S_SendData(SPI1, (uint16_t)(0x04 | reg << 8));
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    data = SPI_I2S_ReceiveData(SPI1);

    /* 读取寄存器的值 */
    SPI_I2S_SendData(SPI1, 0x0000);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    data = SPI_I2S_ReceiveData(SPI1);

    /* 将片选拉高 */
    GPIO_SetBits(AD7175_CS_PORT, AD7175_CS_PIN);

    return data;
}

void AD7175_WriteRegister(uint8_t reg, uint16_t value)
{
    /* 先将片选拉低 */
    GPIO_ResetBits(AD7175_CS_PORT, AD7175_CS_PIN);

    /* 发送写寄存器的命令 */
    SPI_I2S_SendData(SPI1, (uint16_t)(0x08 | reg << 8));
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    SPI_I2S_ReceiveData(SPI1);

    /* 写入寄存器的值 */
    SPI_I2S_SendData(SPI1, value);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    SPI_I2S_ReceiveData(SPI1);

    /* 将片选拉高 */
    GPIO_SetBits(AD7175_CS_PORT, AD7175_CS_PIN);
}

使用方法：

1. 在主函数中调用 `AD7175_Init()` 进行初始化。
2. 调用 `AD7175_ReadRegister(reg)` 函数可以读取指定寄存器的值，其中 `reg` 参数是寄存器的地址，返回值是该寄存器的值。
3. 调用 `AD7175_WriteRegister(reg, value)` 函数可以向指定寄存器写入指定的值，其中 `reg` 是寄存器的地址，`value` 是要写入的值。