MCP4541 stm32程序

以下是使用STM32控制MCP4541的基础程序，你可以根据你的具体需求进行修改：

#include "stm32f10x.h"
#include "stm32f10x_spi.h"

#define MCP4541_CS_PIN GPIO_Pin_4
#define MCP4541_CS_PORT GPIOA

void MCP4541_SPI_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef SPI_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);

    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);

    GPIO_InitStructure.GPIO_Pin = MCP4541_CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(MCP4541_CS_PORT, &GPIO_InitStructure);

    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
    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);
}

void MCP4541_Write(uint8_t value)
{
    GPIO_ResetBits(MCP4541_CS_PORT, MCP4541_CS_PIN);
    SPI_I2S_SendData(SPI1, value);
    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
    GPIO_SetBits(MCP4541_CS_PORT, MCP4541_CS_PIN);
}

int main(void)
{
    MCP4541_SPI_Init();

    while (1) {
        /* write your code here */
    }
}

以上程序的作用是初始化STM32的SPI接口，并向MCP4541写入一个字节的数据。你可以在 `main` 函数中编写你的代码，调用 `MCP4541_Write` 函数来控制MCP4541的输出电压。