694 lines
16 KiB
C
694 lines
16 KiB
C
/* Industrialio buffer test code.
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is primarily intended as an example application.
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* Reads the current buffer setup from sysfs and starts a short capture
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* from the specified device, pretty printing the result after appropriate
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* conversion.
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*
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* Command line parameters
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* generic_buffer -n <device_name> -t <trigger_name>
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* If trigger name is not specified the program assumes you want a dataready
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* trigger associated with the device and goes looking for it.
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*
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/dir.h>
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#include <linux/types.h>
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#include <string.h>
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#include <poll.h>
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#include <endian.h>
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#include <getopt.h>
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#include <inttypes.h>
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#include <stdbool.h>
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#include <signal.h>
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#include "iio_utils.h"
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/**
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* enum autochan - state for the automatic channel enabling mechanism
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*/
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enum autochan {
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AUTOCHANNELS_DISABLED,
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AUTOCHANNELS_ENABLED,
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AUTOCHANNELS_ACTIVE,
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};
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/**
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* size_from_channelarray() - calculate the storage size of a scan
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* @channels: the channel info array
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* @num_channels: number of channels
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*
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* Has the side effect of filling the channels[i].location values used
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* in processing the buffer output.
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**/
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int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
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{
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int bytes = 0;
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int i = 0;
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while (i < num_channels) {
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if (bytes % channels[i].bytes == 0)
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channels[i].location = bytes;
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else
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channels[i].location = bytes - bytes % channels[i].bytes
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+ channels[i].bytes;
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bytes = channels[i].location + channels[i].bytes;
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i++;
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}
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return bytes;
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}
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void print1byte(uint8_t input, struct iio_channel_info *info)
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{
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/*
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* Shift before conversion to avoid sign extension
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* of left aligned data
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*/
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input >>= info->shift;
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input &= info->mask;
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if (info->is_signed) {
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int8_t val = (int8_t)(input << (8 - info->bits_used)) >>
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(8 - info->bits_used);
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printf("%05f ", ((float)val + info->offset) * info->scale);
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} else {
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printf("%05f ", ((float)input + info->offset) * info->scale);
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}
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}
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void print2byte(uint16_t input, struct iio_channel_info *info)
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{
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/* First swap if incorrect endian */
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if (info->be)
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input = be16toh(input);
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else
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input = le16toh(input);
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/*
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* Shift before conversion to avoid sign extension
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* of left aligned data
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*/
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input >>= info->shift;
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input &= info->mask;
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if (info->is_signed) {
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int16_t val = (int16_t)(input << (16 - info->bits_used)) >>
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(16 - info->bits_used);
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printf("%05f ", ((float)val + info->offset) * info->scale);
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} else {
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printf("%05f ", ((float)input + info->offset) * info->scale);
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}
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}
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void print4byte(uint32_t input, struct iio_channel_info *info)
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{
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/* First swap if incorrect endian */
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if (info->be)
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input = be32toh(input);
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else
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input = le32toh(input);
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/*
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* Shift before conversion to avoid sign extension
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* of left aligned data
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*/
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input >>= info->shift;
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input &= info->mask;
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if (info->is_signed) {
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int32_t val = (int32_t)(input << (32 - info->bits_used)) >>
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(32 - info->bits_used);
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printf("%05f ", ((float)val + info->offset) * info->scale);
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} else {
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printf("%05f ", ((float)input + info->offset) * info->scale);
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}
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}
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void print8byte(uint64_t input, struct iio_channel_info *info)
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{
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/* First swap if incorrect endian */
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if (info->be)
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input = be64toh(input);
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else
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input = le64toh(input);
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/*
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* Shift before conversion to avoid sign extension
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* of left aligned data
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*/
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input >>= info->shift;
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input &= info->mask;
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if (info->is_signed) {
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int64_t val = (int64_t)(input << (64 - info->bits_used)) >>
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(64 - info->bits_used);
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/* special case for timestamp */
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if (info->scale == 1.0f && info->offset == 0.0f)
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printf("%" PRId64 " ", val);
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else
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printf("%05f ",
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((float)val + info->offset) * info->scale);
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} else {
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printf("%05f ", ((float)input + info->offset) * info->scale);
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}
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}
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/**
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* process_scan() - print out the values in SI units
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* @data: pointer to the start of the scan
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* @channels: information about the channels.
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* Note: size_from_channelarray must have been called first
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* to fill the location offsets.
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* @num_channels: number of channels
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**/
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void process_scan(char *data,
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struct iio_channel_info *channels,
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int num_channels)
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{
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int k;
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for (k = 0; k < num_channels; k++)
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switch (channels[k].bytes) {
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/* only a few cases implemented so far */
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case 1:
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print1byte(*(uint8_t *)(data + channels[k].location),
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&channels[k]);
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break;
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case 2:
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print2byte(*(uint16_t *)(data + channels[k].location),
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&channels[k]);
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break;
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case 4:
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print4byte(*(uint32_t *)(data + channels[k].location),
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&channels[k]);
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break;
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case 8:
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print8byte(*(uint64_t *)(data + channels[k].location),
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&channels[k]);
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break;
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default:
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break;
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}
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printf("\n");
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}
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static int enable_disable_all_channels(char *dev_dir_name, int enable)
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{
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const struct dirent *ent;
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char scanelemdir[256];
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DIR *dp;
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int ret;
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snprintf(scanelemdir, sizeof(scanelemdir),
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FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name);
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scanelemdir[sizeof(scanelemdir)-1] = '\0';
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dp = opendir(scanelemdir);
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if (!dp) {
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fprintf(stderr, "Enabling/disabling channels: can't open %s\n",
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scanelemdir);
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return -EIO;
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}
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ret = -ENOENT;
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while (ent = readdir(dp), ent) {
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if (iioutils_check_suffix(ent->d_name, "_en")) {
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printf("%sabling: %s\n",
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enable ? "En" : "Dis",
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ent->d_name);
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ret = write_sysfs_int(ent->d_name, scanelemdir,
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enable);
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if (ret < 0)
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fprintf(stderr, "Failed to enable/disable %s\n",
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ent->d_name);
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}
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}
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if (closedir(dp) == -1) {
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perror("Enabling/disabling channels: "
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"Failed to close directory");
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return -errno;
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}
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return 0;
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}
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void print_usage(void)
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{
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fprintf(stderr, "Usage: generic_buffer [options]...\n"
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"Capture, convert and output data from IIO device buffer\n"
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" -a Auto-activate all available channels\n"
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" -A Force-activate ALL channels\n"
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" -c <n> Do n conversions, or loop forever if n < 0\n"
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" -e Disable wait for event (new data)\n"
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" -g Use trigger-less mode\n"
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" -l <n> Set buffer length to n samples\n"
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" --device-name -n <name>\n"
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" --device-num -N <num>\n"
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" Set device by name or number (mandatory)\n"
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" --trigger-name -t <name>\n"
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" --trigger-num -T <num>\n"
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" Set trigger by name or number\n"
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" -w <n> Set delay between reads in us (event-less mode)\n");
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}
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enum autochan autochannels = AUTOCHANNELS_DISABLED;
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char *dev_dir_name = NULL;
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char *buf_dir_name = NULL;
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bool current_trigger_set = false;
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void cleanup(void)
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{
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int ret;
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/* Disable trigger */
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if (dev_dir_name && current_trigger_set) {
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/* Disconnect the trigger - just write a dummy name. */
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ret = write_sysfs_string("trigger/current_trigger",
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dev_dir_name, "NULL");
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if (ret < 0)
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fprintf(stderr, "Failed to disable trigger: %s\n",
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strerror(-ret));
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current_trigger_set = false;
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}
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/* Disable buffer */
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if (buf_dir_name) {
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ret = write_sysfs_int("enable", buf_dir_name, 0);
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if (ret < 0)
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fprintf(stderr, "Failed to disable buffer: %s\n",
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strerror(-ret));
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}
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/* Disable channels if auto-enabled */
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if (dev_dir_name && autochannels == AUTOCHANNELS_ACTIVE) {
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ret = enable_disable_all_channels(dev_dir_name, 0);
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if (ret)
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fprintf(stderr, "Failed to disable all channels\n");
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autochannels = AUTOCHANNELS_DISABLED;
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}
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}
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void sig_handler(int signum)
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{
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fprintf(stderr, "Caught signal %d\n", signum);
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cleanup();
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exit(-signum);
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}
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void register_cleanup(void)
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{
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struct sigaction sa = { .sa_handler = sig_handler };
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const int signums[] = { SIGINT, SIGTERM, SIGABRT };
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int ret, i;
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for (i = 0; i < ARRAY_SIZE(signums); ++i) {
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ret = sigaction(signums[i], &sa, NULL);
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if (ret) {
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perror("Failed to register signal handler");
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exit(-1);
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}
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}
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}
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static const struct option longopts[] = {
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{ "device-name", 1, 0, 'n' },
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{ "device-num", 1, 0, 'N' },
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{ "trigger-name", 1, 0, 't' },
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{ "trigger-num", 1, 0, 'T' },
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{ },
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};
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int main(int argc, char **argv)
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{
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unsigned long long num_loops = 2;
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unsigned long timedelay = 1000000;
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unsigned long buf_len = 128;
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ssize_t i;
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unsigned long long j;
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unsigned long toread;
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int ret, c;
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int fp = -1;
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int num_channels = 0;
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char *trigger_name = NULL, *device_name = NULL;
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char *data = NULL;
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ssize_t read_size;
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int dev_num = -1, trig_num = -1;
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char *buffer_access = NULL;
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int scan_size;
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int noevents = 0;
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int notrigger = 0;
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char *dummy;
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bool force_autochannels = false;
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struct iio_channel_info *channels = NULL;
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register_cleanup();
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while ((c = getopt_long(argc, argv, "aAc:egl:n:N:t:T:w:?", longopts,
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NULL)) != -1) {
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switch (c) {
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case 'a':
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autochannels = AUTOCHANNELS_ENABLED;
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break;
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case 'A':
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autochannels = AUTOCHANNELS_ENABLED;
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force_autochannels = true;
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break;
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case 'c':
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errno = 0;
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num_loops = strtoll(optarg, &dummy, 10);
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if (errno) {
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ret = -errno;
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goto error;
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}
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break;
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case 'e':
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noevents = 1;
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break;
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case 'g':
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notrigger = 1;
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break;
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case 'l':
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errno = 0;
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buf_len = strtoul(optarg, &dummy, 10);
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if (errno) {
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ret = -errno;
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goto error;
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}
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break;
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case 'n':
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device_name = strdup(optarg);
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break;
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case 'N':
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errno = 0;
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dev_num = strtoul(optarg, &dummy, 10);
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if (errno) {
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ret = -errno;
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goto error;
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}
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break;
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case 't':
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trigger_name = strdup(optarg);
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break;
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case 'T':
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errno = 0;
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trig_num = strtoul(optarg, &dummy, 10);
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if (errno)
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return -errno;
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break;
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case 'w':
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errno = 0;
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timedelay = strtoul(optarg, &dummy, 10);
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if (errno) {
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ret = -errno;
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goto error;
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}
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break;
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case '?':
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print_usage();
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ret = -1;
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goto error;
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}
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}
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/* Find the device requested */
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if (dev_num < 0 && !device_name) {
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fprintf(stderr, "Device not set\n");
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print_usage();
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ret = -1;
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goto error;
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} else if (dev_num >= 0 && device_name) {
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fprintf(stderr, "Only one of --device-num or --device-name needs to be set\n");
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print_usage();
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ret = -1;
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goto error;
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} else if (dev_num < 0) {
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dev_num = find_type_by_name(device_name, "iio:device");
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if (dev_num < 0) {
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fprintf(stderr, "Failed to find the %s\n", device_name);
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ret = dev_num;
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goto error;
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}
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}
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printf("iio device number being used is %d\n", dev_num);
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ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
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if (ret < 0)
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return -ENOMEM;
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/* Fetch device_name if specified by number */
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if (!device_name) {
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device_name = malloc(IIO_MAX_NAME_LENGTH);
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if (!device_name) {
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ret = -ENOMEM;
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goto error;
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}
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ret = read_sysfs_string("name", dev_dir_name, device_name);
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if (ret < 0) {
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fprintf(stderr, "Failed to read name of device %d\n", dev_num);
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goto error;
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}
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}
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if (notrigger) {
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printf("trigger-less mode selected\n");
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} else if (trig_num >= 0) {
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char *trig_dev_name;
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ret = asprintf(&trig_dev_name, "%strigger%d", iio_dir, trig_num);
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if (ret < 0) {
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return -ENOMEM;
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}
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trigger_name = malloc(IIO_MAX_NAME_LENGTH);
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ret = read_sysfs_string("name", trig_dev_name, trigger_name);
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free(trig_dev_name);
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if (ret < 0) {
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fprintf(stderr, "Failed to read trigger%d name from\n", trig_num);
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return ret;
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}
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printf("iio trigger number being used is %d\n", trig_num);
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} else {
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if (!trigger_name) {
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/*
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* Build the trigger name. If it is device associated
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* its name is <device_name>_dev[n] where n matches
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* the device number found above.
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*/
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ret = asprintf(&trigger_name,
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"%s-dev%d", device_name, dev_num);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error;
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}
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}
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/* Look for this "-devN" trigger */
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trig_num = find_type_by_name(trigger_name, "trigger");
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if (trig_num < 0) {
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/* OK try the simpler "-trigger" suffix instead */
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free(trigger_name);
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ret = asprintf(&trigger_name,
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"%s-trigger", device_name);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error;
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}
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}
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trig_num = find_type_by_name(trigger_name, "trigger");
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if (trig_num < 0) {
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fprintf(stderr, "Failed to find the trigger %s\n",
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trigger_name);
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ret = trig_num;
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goto error;
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}
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printf("iio trigger number being used is %d\n", trig_num);
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}
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/*
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* Parse the files in scan_elements to identify what channels are
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* present
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*/
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ret = build_channel_array(dev_dir_name, &channels, &num_channels);
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if (ret) {
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fprintf(stderr, "Problem reading scan element information\n"
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"diag %s\n", dev_dir_name);
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goto error;
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}
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if (num_channels && autochannels == AUTOCHANNELS_ENABLED &&
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!force_autochannels) {
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fprintf(stderr, "Auto-channels selected but some channels "
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"are already activated in sysfs\n");
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fprintf(stderr, "Proceeding without activating any channels\n");
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}
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if ((!num_channels && autochannels == AUTOCHANNELS_ENABLED) ||
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(autochannels == AUTOCHANNELS_ENABLED && force_autochannels)) {
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fprintf(stderr, "Enabling all channels\n");
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|
|
ret = enable_disable_all_channels(dev_dir_name, 1);
|
|
if (ret) {
|
|
fprintf(stderr, "Failed to enable all channels\n");
|
|
goto error;
|
|
}
|
|
|
|
/* This flags that we need to disable the channels again */
|
|
autochannels = AUTOCHANNELS_ACTIVE;
|
|
|
|
ret = build_channel_array(dev_dir_name, &channels,
|
|
&num_channels);
|
|
if (ret) {
|
|
fprintf(stderr, "Problem reading scan element "
|
|
"information\n"
|
|
"diag %s\n", dev_dir_name);
|
|
goto error;
|
|
}
|
|
if (!num_channels) {
|
|
fprintf(stderr, "Still no channels after "
|
|
"auto-enabling, giving up\n");
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
if (!num_channels && autochannels == AUTOCHANNELS_DISABLED) {
|
|
fprintf(stderr,
|
|
"No channels are enabled, we have nothing to scan.\n");
|
|
fprintf(stderr, "Enable channels manually in "
|
|
FORMAT_SCAN_ELEMENTS_DIR
|
|
"/*_en or pass -a to autoenable channels and "
|
|
"try again.\n", dev_dir_name);
|
|
ret = -ENOENT;
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* Construct the directory name for the associated buffer.
|
|
* As we know that the lis3l02dq has only one buffer this may
|
|
* be built rather than found.
|
|
*/
|
|
ret = asprintf(&buf_dir_name,
|
|
"%siio:device%d/buffer", iio_dir, dev_num);
|
|
if (ret < 0) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
if (!notrigger) {
|
|
printf("%s %s\n", dev_dir_name, trigger_name);
|
|
/*
|
|
* Set the device trigger to be the data ready trigger found
|
|
* above
|
|
*/
|
|
ret = write_sysfs_string_and_verify("trigger/current_trigger",
|
|
dev_dir_name,
|
|
trigger_name);
|
|
if (ret < 0) {
|
|
fprintf(stderr,
|
|
"Failed to write current_trigger file\n");
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Setup ring buffer parameters */
|
|
ret = write_sysfs_int("length", buf_dir_name, buf_len);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
/* Enable the buffer */
|
|
ret = write_sysfs_int("enable", buf_dir_name, 1);
|
|
if (ret < 0) {
|
|
fprintf(stderr,
|
|
"Failed to enable buffer: %s\n", strerror(-ret));
|
|
goto error;
|
|
}
|
|
|
|
scan_size = size_from_channelarray(channels, num_channels);
|
|
data = malloc(scan_size * buf_len);
|
|
if (!data) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num);
|
|
if (ret < 0) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
/* Attempt to open non blocking the access dev */
|
|
fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
|
|
if (fp == -1) { /* TODO: If it isn't there make the node */
|
|
ret = -errno;
|
|
fprintf(stderr, "Failed to open %s\n", buffer_access);
|
|
goto error;
|
|
}
|
|
|
|
for (j = 0; j < num_loops || num_loops < 0; j++) {
|
|
if (!noevents) {
|
|
struct pollfd pfd = {
|
|
.fd = fp,
|
|
.events = POLLIN,
|
|
};
|
|
|
|
ret = poll(&pfd, 1, -1);
|
|
if (ret < 0) {
|
|
ret = -errno;
|
|
goto error;
|
|
} else if (ret == 0) {
|
|
continue;
|
|
}
|
|
|
|
toread = buf_len;
|
|
} else {
|
|
usleep(timedelay);
|
|
toread = 64;
|
|
}
|
|
|
|
read_size = read(fp, data, toread * scan_size);
|
|
if (read_size < 0) {
|
|
if (errno == EAGAIN) {
|
|
fprintf(stderr, "nothing available\n");
|
|
continue;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
for (i = 0; i < read_size / scan_size; i++)
|
|
process_scan(data + scan_size * i, channels,
|
|
num_channels);
|
|
}
|
|
|
|
error:
|
|
cleanup();
|
|
|
|
if (fp >= 0 && close(fp) == -1)
|
|
perror("Failed to close buffer");
|
|
free(buffer_access);
|
|
free(data);
|
|
free(buf_dir_name);
|
|
for (i = num_channels - 1; i >= 0; i--) {
|
|
free(channels[i].name);
|
|
free(channels[i].generic_name);
|
|
}
|
|
free(channels);
|
|
free(trigger_name);
|
|
free(device_name);
|
|
free(dev_dir_name);
|
|
|
|
return ret;
|
|
}
|