STM32f103c8t6 驱动MAX5495代码

MAX5495是一款数字电位器，可以通过SPI接口进行控制，以下是基于STM32F103C8T6的MAX5495驱动代码：

#include "stm32f10x.h"

#define CS_GPIO GPIOA
#define CS_PIN GPIO_Pin_4

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

    /* Enable SPI1 and GPIOA clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA, ENABLE);

    /* Configure SPI1 pins: SCK, MISO and MOSI */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Configure CS pin */
    GPIO_InitStructure.GPIO_Pin = CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(CS_GPIO, &GPIO_InitStructure);

    /* SPI1 configuration */
    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_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);

    /* Enable SPI1 */
    SPI_Cmd(SPI1, ENABLE);
}

void MAX5495_Write(uint8_t addr, uint8_t value)
{
    /* Set CS low */
    GPIO_ResetBits(CS_GPIO, CS_PIN);

    /* Send address and data */
    SPI_I2S_SendData(SPI1, addr << 8 | value);

    /* Wait for transmission to complete */
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);

    /* Set CS high */
    GPIO_SetBits(CS_GPIO, CS_PIN);
}

int main(void)
{
    /* Configure SPI */
    SPI_Configuration();

    /* Write to MAX5495 */
    MAX5495_Write(0x00, 0x7F); // Set wiper position to mid-scale

    while (1)
    {
        //...
    }
}

以上代码只是一个简单的示例，实际使用时可能需要根据具体的应用场景进行修改。同时，需要注意的是，MAX5495的控制方式可能会因具体型号而有所差异，建议先查阅相关的数据手册。