配置MCP4551 代码示例

MCP4551是一个12位数字模拟转换器（DAC），常用于工业控制和嵌入式系统中。配置MCP4551的代码示例通常涉及到硬件初始化、选择通道和写入数字值。这里提供一个基本的C代码片段，假设你已经连接了SPI总线：

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <SPI.h>

#define MCP4551_ADDRESS 0x60 // I2C地址，注意实际使用时可能根据硬件配置不同
#define MCP4551_DAC SelectionRegister 0x00
#define MCP4551_DATA 0x01

// SPI实例
SPISettings spiSettings(500000, MSBFIRST, SPI_MODE3); // 500kHz SPI clock, MSB first, mode 3
SPIClass spi;

void setup() {
    Serial.begin(9600);
    spi.begin();
    pinMode(SPI_MISO, INPUT); // SPI MOSI pin连接到MCP4551的DIN
    pinMode(SPI_MOSI, OUTPUT); // 初始化为输出
    digitalWrite(SPI_MISO, HIGH); // Set MISO high for master mode
}

void dacWrite(uint8_t channel, uint16_t value) {
    uint8_t data;
    
    // Set channel and data
    data = channel | 0x10; // Channel selection bit is set (bit 4)
    data = value >> 8; // Shift value to MSB for 12-bit write
    
    // Write to MCP4551
    spi.transfer(data, 2);
}

int main() {
    dacWrite(MCP4551_DAC, 0x3C00); // Write a sample value (3.3V at full scale)
    
    // Example of writing to different channels
    dacWrite(MCP4551_DAC, 0x2000); // Channel 0, 2V
    dacWrite(MCP4551_DAC, 0x4000); // Channel 1, 4V
    
    return 0;
}