ad7923 C程序
时间: 2024-02-28 08:52:57 浏览: 24
以下是一个使用AD7923进行单次转换的简单C程序示例,使用的是SPI接口:
```C
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>
#define SPI_SPEED 1000000 // SPI通信速率
#define SPI_MODE SPI_MODE_0 // SPI工作模式
#define GPIO_CS 24 // 片选GPIO引脚号
int main()
{
int fd, ret;
unsigned char txbuf[3], rxbuf[3];
struct spi_ioc_transfer tr;
// 打开SPI设备文件
fd = open("/dev/spidev0.0", O_RDWR);
if (fd < 0) {
perror("open spi error");
return -1;
}
// 设置SPI通信参数
int mode = SPI_MODE;
ret = ioctl(fd, SPI_IOC_WR_MODE, &mode);
if (ret < 0) {
perror("set spi mode error");
return -1;
}
int speed = SPI_SPEED;
ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
if (ret < 0) {
perror("set spi speed error");
return -1;
}
// 设置片选GPIO引脚
int gpio_cs = GPIO_CS;
int cs_fd = open("/sys/class/gpio/export", O_WRONLY);
write(cs_fd, "24", 2);
close(cs_fd);
char cs_pin[256];
sprintf(cs_pin, "/sys/class/gpio/gpio%d/direction", gpio_cs);
int cs_pin_fd = open(cs_pin, O_WRONLY);
write(cs_pin_fd, "out", 3);
close(cs_pin_fd);
// 初始化AD7923
txbuf[0] = 0x03;
txbuf[1] = 0x00;
txbuf[2] = 0x00;
tr.tx_buf = (unsigned long)txbuf;
tr.rx_buf = (unsigned long)rxbuf;
tr.len = 3;
tr.delay_usecs = 0;
tr.speed_hz = speed;
tr.bits_per_word = 8;
write(gpio_cs, "0", 1);
ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
if (ret < 0) {
perror("init ad7923 error");
return -1;
}
write(gpio_cs, "1", 1);
// 启动单次转换
txbuf[0] = 0x01;
txbuf[1] = 0x00;
txbuf[2] = 0x00;
tr.tx_buf = (unsigned long)txbuf;
tr.rx_buf = (unsigned long)rxbuf;
tr.len = 3;
tr.delay_usecs = 0;
tr.speed_hz = speed;
tr.bits_per_word = 8;
write(gpio_cs, "0", 1);
ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
if (ret < 0) {
perror("start ad7923 conversion error");
return -1;
}
write(gpio_cs, "1", 1);
// 读取转换结果
int result = (rxbuf[1] << 8) | rxbuf[2];
printf("AD7923 conversion result: %d\n", result);
// 关闭SPI设备文件
close(fd);
return 0;
}
```
需要注意的是,上述程序仅供参考,具体实现还需要根据具体情况进行调整和优化。
相关推荐
![C](https://img-home.csdnimg.cn/images/20210720083646.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)