IIO(字符)设备输出无输出-IIO缓冲区

本文介绍了IIO(字符)设备输出无输出-IIO缓冲区的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在为ADC ADS1243开发Linux驱动程序，并使用IIO框架.我想添加功能以将数据从ADC读取和存储到IIO缓冲区.

I'm working on Linux driver for ADC ADS1243 and use IIO framework. I want to add feature to read and store data from ADC to IIO buffer.

我添加了iio_triggered_buffer_setup()来探测驱动程序的功能.

I added iio_triggered_buffer_setup() to probe function of driver.

ret = iio_triggered_buffer_setup(indio_dev, NULL, &ads1243_trigger_handler, NULL);

我正在使用sysfs触发器，并且成功调用了ads1243_trigger_handler.

I'm using sysfs trigger and ads1243_trigger_handler is succesfully called.

static irqreturn_t ads1243_trigger_handler(int irq, void *p)
{
    struct iio_poll_func *pf = p;
    struct iio_dev *indio_dev = pf->indio_dev;
    struct ads1243_state *st = iio_priv(indio_dev);
    u32 val[8];
    int ret;

    val[0] = 0x01;
    val[1] = 0x02;
    val[2] = 0x03;
    val[3] = 0x04;

    ret = iio_push_to_buffers_with_timestamp(indio_dev, val,
                                       iio_get_time_ns());
    /* iio_push_to_buffers(indio_dev, val); */

    iio_trigger_notify_done(indio_dev->trig);

    return IRQ_HANDLED;

}

在处理程序中，我只使用一些推送到iio缓冲区的测试数据.

In the handler I use just some test data pushed to iio buffer.

然后我设置触发器

echo 0 > iio_sysfs_trigger/add_trigger
cat /sys/bus/iio/devices/trigger0/name > /sys/bus/iio/devices/iio:device1/trigger/current_trigger

启用一些扫描元素，设置并启用iio设备的缓冲区

enable some scan elements, setup and enable the buffer for iio device

echo 1 > scan_elements/in_voltage0-voltage1_en
echo 1 > scan_elements/in_voltage2-voltage3_en

echo 64 > buffer/length
echo 1 > buffer/enable

触发扳机

echo 1 > /sys/bus/iio/devices/trigger0/trigger_now

，然后尝试读取设备(缓冲区)

and then try to read the device (buffer)

cat /dev/iio\:device1

但是我没有输出.我错过了重要的东西吗?

But I got no output. Am I missing something important?

感谢您的回复！

IIO

IIO(字符)设备输出无输出-IIO缓冲区

问题描述

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