linux+iio+ad9361应用程序代码

以下是一个使用Linux IIO框架和AD9361芯片的简单应用程序：

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/i2c-dev.h>
#include <linux/spi/spidev.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

#define ADC_BUFFER_SIZE 4096

int main(void)
{
    int ret;
    int i, j;
    int fd_adc, fd_dac;
    char in_buffer[ADC_BUFFER_SIZE];
    char out_buffer[ADC_BUFFER_SIZE];
    struct iio_device *adc_device, *dac_device;
    struct iio_channel *in_channel, *out_channel;
    struct iio_buffer *adc_buffer, *dac_buffer;
    int num_channels_in, num_channels_out;
    ssize_t nbytes;

    // 打开 IIO 设备节点
    fd_adc = open("/dev/iio:device0", O_RDWR);
    if (fd_adc < 0) {
        perror("Failed to open ADC IIO device");
        return -1;
    }

    fd_dac = open("/dev/iio:device1", O_RDWR);
    if (fd_dac < 0) {
        perror("Failed to open DAC IIO device");
        return -1;
    }

    // 获取 IIO 设备信息
    adc_device = iio_device_create(fd_adc, "ad9361-phy");
    dac_device = iio_device_create(fd_dac, "ad9361-phy");
    if (!adc_device || !dac_device) {
        perror("Failed to create IIO device");
        return -1;
    }

    // 获取输入通道和输出通道
    num_channels_in = iio_device_get_num_channels(adc_device);
    num_channels_out = iio_device_get_num_channels(dac_device);
    in_channel = iio_device_get_channel(adc_device, 0);
    out_channel = iio_device_get_channel(dac_device, 0);
    if (!in_channel || !out_channel) {
        perror("Failed to get IIO channel");
        return -1;
    }

    // 创建输入和输出缓冲区
    adc_buffer = iio_device_create_buffer(adc_device, ADC_BUFFER_SIZE, false);
    dac_buffer = iio_device_create_buffer(dac_device, ADC_BUFFER_SIZE, false);
    if (!adc_buffer || !dac_buffer) {
        perror("Failed to create IIO buffer");
        return -1;
    }

    // 循环执行数据采样和输出
    for (i = 0; i < 100; i++) {
        // 读取 ADC 数据
        nbytes = iio_buffer_refill(adc_buffer);
        if (nbytes < 0) {
            perror("Failed to read ADC data");
            return -1;
        }
        memcpy(in_buffer, iio_buffer_start(adc_buffer), nbytes);

        // 处理 ADC 数据
        for (j = 0; j < nbytes; j++) {
            in_buffer[j] = in_buffer[j] * 2; // 增益2倍
        }

        // 将处理后的数据写入 DAC
        memcpy(iio_buffer_start(dac_buffer), out_buffer, nbytes);
        nbytes = iio_buffer_push(dac_buffer);
        if (nbytes < 0) {
            perror("Failed to write DAC data");
            return -1;
        }

        usleep(1000);
    }

    // 关闭 IIO 设备节点
    iio_device_destroy(adc_device);
    iio_device_destroy(dac_device);
    close(fd_adc);
    close(fd_dac);

    return 0;
}

注意：以上代码仅供参考，实际应用中还需要根据具体硬件平台和系统环境做相应的调整和优化。