写一段基于AD5328的程序
时间: 2024-02-18 16:01:44 浏览: 31
AD5328是一款8通道16位DAC芯片,可以通过SPI接口进行控制。下面是一段基于AD5328的C语言程序,用于将8个通道的输出电压设置为特定值:
```
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>
#define SPI_DEVICE "/dev/spidev0.0"
#define SPI_MODE SPI_MODE_0
#define SPI_SPEED_HZ 1000000
int spi_fd;
void set_voltage(uint8_t channel, uint16_t voltage) {
uint8_t tx_buf[3];
uint8_t rx_buf[3];
tx_buf[0] = 0x30 | ((channel & 0x07) << 1);
tx_buf[1] = voltage >> 8;
tx_buf[2] = voltage & 0xFF;
struct spi_ioc_transfer transfer = {
.tx_buf = (unsigned long)tx_buf,
.rx_buf = (unsigned long)rx_buf,
.len = 3,
.delay_usecs = 0,
.speed_hz = SPI_SPEED_HZ,
.bits_per_word = 8,
};
ioctl(spi_fd, SPI_IOC_MESSAGE(1), &transfer);
}
int main() {
spi_fd = open(SPI_DEVICE, O_RDWR);
if (spi_fd < 0) {
perror("Error opening SPI device");
exit(1);
}
uint8_t mode = SPI_MODE;
if (ioctl(spi_fd, SPI_IOC_WR_MODE, &mode) < 0) {
perror("Error setting SPI mode");
exit(1);
}
uint32_t speed = SPI_SPEED_HZ;
if (ioctl(spi_fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed) < 0) {
perror("Error setting SPI speed");
exit(1);
}
set_voltage(0, 0x7FFF); // Set channel 0 to 50% of full scale
set_voltage(1, 0xFFFF); // Set channel 1 to full scale
close(spi_fd);
return 0;
}
```
这段程序首先打开了SPI设备文件 `/dev/spidev0.0`,然后设置了SPI模式和时钟频率。之后调用了 `set_voltage` 函数来设置各个通道的输出电压。该函数通过SPI接口发送3字节的数据,第一个字节表示通道号和写操作,第二个和第三个字节表示DAC输出的16位值。最后程序关闭了SPI设备文件并退出。