51单片机ReadAD函数c语言,AD7193驱动代码 C语言

以下是51单片机ReadAD函数c语言和AD7193驱动代码C语言的示例：

51单片机ReadAD函数c语言示例：

#include <reg52.h>

/*
 * 函数名称：ReadAD
 * 函数功能：读取AD转换值
 * 函数输入：无
 * 函数输出：AD转换值
 */
unsigned int ReadAD()
{
    unsigned int ad_value;

    //设置AD口为模拟输入
    P1ASF = 0x01;

    //开始AD转换
    ADC_CONTR = 0x90;

    //等待转换完成
    while (!(ADC_CONTR & 0x20));

    //读取转换结果
    ad_value = ADC_RES;
    ad_value |= ADC_RESL << 8;

    return ad_value;
}

AD7193驱动代码C语言示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>

#define SPI_DEVICE      "/dev/spidev0.0"
#define SPI_MODE        SPI_MODE_3
#define SPI_BITS_PER_WORD   8
#define SPI_SPEED       1000000

/*
 * 函数名称：AD7193_Init
 * 函数功能：初始化AD7193
 * 函数输入：无
 * 函数输出：0--成功，其他--失败
 */
int AD7193_Init()
{
    int fd;
    unsigned char tx_data[6], rx_data[6];
    struct spi_ioc_transfer tr = {
        .tx_buf = (unsigned long)tx_data,
        .rx_buf = (unsigned long)rx_data,
        .len = 6,
        .delay_usecs = 0,
        .speed_hz = SPI_SPEED,
        .bits_per_word = SPI_BITS_PER_WORD,
    };

    //打开SPI设备
    fd = open(SPI_DEVICE, O_RDWR);
    if (fd < 0) {
        printf("Failed to open SPI device\n");
        return -1;
    }

    //设置SPI模式
    ioctl(fd, SPI_IOC_WR_MODE, &SPI_MODE);

    //设置SPI数据位数
    ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &SPI_BITS_PER_WORD);

    //设置SPI时钟速度
    ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &SPI_SPEED);

    //软复位AD7193
    tx_data[0] = 0xFF;
    tx_data[1] = 0xFF;
    tx_data[2] = 0xFF;
    tx_data[3] = 0xFF;
    tx_data[4] = 0xFF;
    tx_data[5] = 0xFF;
    if (ioctl(fd, SPI_IOC_MESSAGE(1), &tr) < 0) {
        printf("Failed to reset AD7193\n");
        close(fd);
        return -1;
    }

    //等待AD7193初始化完成
    usleep(5000);

    //设置AD7193配置寄存器
    tx_data[0] = 0x10;
    tx_data[1] = 0x00;
    tx_data[2] = 0x00;
    tx_data[3] = 0x00;
    tx_data[4] = 0x00;
    tx_data[5] = 0x00;
    if (ioctl(fd, SPI_IOC_MESSAGE(1), &tr) < 0) {
        printf("Failed to set AD7193 config register\n");
        close(fd);
        return -1;
    }

    //设置AD7193模式寄存器
    tx_data[0] = 0x08;
    tx_data[1] = 0x00;
    tx_data[2] = 0x00;
    tx_data[3] = 0x00;
    tx_data[4] = 0x00;
    tx_data[5] = 0x00;
    if (ioctl(fd, SPI_IOC_MESSAGE(1), &tr) < 0) {
        printf("Failed to set AD7193 mode register\n");
        close(fd);
        return -1;
    }

    //关闭SPI设备
    close(fd);

    return 0;
}

/*
 * 函数名称：AD7193_ReadData
 * 函数功能：读取AD7193转换值
 * 函数输入：无
 * 函数输出：AD转换值
 */
unsigned int AD7193_ReadData()
{
    int fd;
    unsigned char tx_data[7], rx_data[7];
    struct spi_ioc_transfer tr = {
        .tx_buf = (unsigned long)tx_data,
        .rx_buf = (unsigned long)rx_data,
        .len = 7,
        .delay_usecs = 0,
        .speed_hz = SPI_SPEED,
        .bits_per_word = SPI_BITS_PER_WORD,
    };
    unsigned int ad_value;

    //打开SPI设备
    fd = open(SPI_DEVICE, O_RDWR);
    if (fd < 0) {
        printf("Failed to open SPI device\n");
        return -1;
    }

    //设置SPI模式
    ioctl(fd, SPI_IOC_WR_MODE, &SPI_MODE);

    //设置SPI数据位数
    ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &SPI_BITS_PER_WORD);

    //设置SPI时钟速度
    ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &SPI_SPEED);

    //读取AD7193转换值
    tx_data[0] = 0x58;
    tx_data[1] = 0x00;
    tx_data[2] = 0x00;
    tx_data[3] = 0x00;
    tx_data[4] = 0x00;
    tx_data[5] = 0x00;
    tx_data[6] = 0x00;
    if (ioctl(fd, SPI_IOC_MESSAGE(1), &tr) < 0) {
        printf("Failed to read AD7193 conversion value\n");
        close(fd);
        return -1;
    }

    //计算AD转换值
    ad_value = rx_data[3];
    ad_value = (ad_value << 8) | rx_data[4];
    ad_value = (ad_value << 8) | rx_data[5];
    ad_value = (ad_value >> 8) & 0xFFFFFF;

    //关闭SPI设备
    close(fd);

    return ad_value;
}