diff options
Diffstat (limited to 'tools/iio/generic_buffer.c')
| -rw-r--r-- | tools/iio/generic_buffer.c | 581 |
1 files changed, 0 insertions, 581 deletions
diff --git a/tools/iio/generic_buffer.c b/tools/iio/generic_buffer.c deleted file mode 100644 index 2429c78de..000000000 --- a/tools/iio/generic_buffer.c +++ /dev/null @@ -1,581 +0,0 @@ -/* Industrialio buffer test code. - * - * Copyright (c) 2008 Jonathan Cameron - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published by - * the Free Software Foundation. - * - * This program is primarily intended as an example application. - * Reads the current buffer setup from sysfs and starts a short capture - * from the specified device, pretty printing the result after appropriate - * conversion. - * - * Command line parameters - * generic_buffer -n <device_name> -t <trigger_name> - * If trigger name is not specified the program assumes you want a dataready - * trigger associated with the device and goes looking for it. - * - */ - -#include <unistd.h> -#include <stdlib.h> -#include <dirent.h> -#include <fcntl.h> -#include <stdio.h> -#include <errno.h> -#include <sys/stat.h> -#include <sys/dir.h> -#include <linux/types.h> -#include <string.h> -#include <poll.h> -#include <endian.h> -#include <getopt.h> -#include <inttypes.h> -#include "iio_utils.h" - -/** - * enum autochan - state for the automatic channel enabling mechanism - */ -enum autochan { - AUTOCHANNELS_DISABLED, - AUTOCHANNELS_ENABLED, - AUTOCHANNELS_ACTIVE, -}; - -/** - * size_from_channelarray() - calculate the storage size of a scan - * @channels: the channel info array - * @num_channels: number of channels - * - * Has the side effect of filling the channels[i].location values used - * in processing the buffer output. - **/ -int size_from_channelarray(struct iio_channel_info *channels, int num_channels) -{ - int bytes = 0; - int i = 0; - - while (i < num_channels) { - if (bytes % channels[i].bytes == 0) - channels[i].location = bytes; - else - channels[i].location = bytes - bytes % channels[i].bytes - + channels[i].bytes; - - bytes = channels[i].location + channels[i].bytes; - i++; - } - - return bytes; -} - -void print1byte(uint8_t input, struct iio_channel_info *info) -{ - /* - * Shift before conversion to avoid sign extension - * of left aligned data - */ - input >>= info->shift; - input &= info->mask; - if (info->is_signed) { - int8_t val = (int8_t)(input << (8 - info->bits_used)) >> - (8 - info->bits_used); - printf("%05f ", ((float)val + info->offset) * info->scale); - } else { - printf("%05f ", ((float)input + info->offset) * info->scale); - } -} - -void print2byte(uint16_t input, struct iio_channel_info *info) -{ - /* First swap if incorrect endian */ - if (info->be) - input = be16toh(input); - else - input = le16toh(input); - - /* - * Shift before conversion to avoid sign extension - * of left aligned data - */ - input >>= info->shift; - input &= info->mask; - if (info->is_signed) { - int16_t val = (int16_t)(input << (16 - info->bits_used)) >> - (16 - info->bits_used); - printf("%05f ", ((float)val + info->offset) * info->scale); - } else { - printf("%05f ", ((float)input + info->offset) * info->scale); - } -} - -void print4byte(uint32_t input, struct iio_channel_info *info) -{ - /* First swap if incorrect endian */ - if (info->be) - input = be32toh(input); - else - input = le32toh(input); - - /* - * Shift before conversion to avoid sign extension - * of left aligned data - */ - input >>= info->shift; - input &= info->mask; - if (info->is_signed) { - int32_t val = (int32_t)(input << (32 - info->bits_used)) >> - (32 - info->bits_used); - printf("%05f ", ((float)val + info->offset) * info->scale); - } else { - printf("%05f ", ((float)input + info->offset) * info->scale); - } -} - -void print8byte(uint64_t input, struct iio_channel_info *info) -{ - /* First swap if incorrect endian */ - if (info->be) - input = be64toh(input); - else - input = le64toh(input); - - /* - * Shift before conversion to avoid sign extension - * of left aligned data - */ - input >>= info->shift; - input &= info->mask; - if (info->is_signed) { - int64_t val = (int64_t)(input << (64 - info->bits_used)) >> - (64 - info->bits_used); - /* special case for timestamp */ - if (info->scale == 1.0f && info->offset == 0.0f) - printf("%" PRId64 " ", val); - else - printf("%05f ", - ((float)val + info->offset) * info->scale); - } else { - printf("%05f ", ((float)input + info->offset) * info->scale); - } -} - -/** - * process_scan() - print out the values in SI units - * @data: pointer to the start of the scan - * @channels: information about the channels. - * Note: size_from_channelarray must have been called first - * to fill the location offsets. - * @num_channels: number of channels - **/ -void process_scan(char *data, - struct iio_channel_info *channels, - int num_channels) -{ - int k; - - for (k = 0; k < num_channels; k++) - switch (channels[k].bytes) { - /* only a few cases implemented so far */ - case 1: - print1byte(*(uint8_t *)(data + channels[k].location), - &channels[k]); - break; - case 2: - print2byte(*(uint16_t *)(data + channels[k].location), - &channels[k]); - break; - case 4: - print4byte(*(uint32_t *)(data + channels[k].location), - &channels[k]); - break; - case 8: - print8byte(*(uint64_t *)(data + channels[k].location), - &channels[k]); - break; - default: - break; - } - printf("\n"); -} - -static int enable_disable_all_channels(char *dev_dir_name, int enable) -{ - const struct dirent *ent; - char scanelemdir[256]; - DIR *dp; - int ret; - - snprintf(scanelemdir, sizeof(scanelemdir), - FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name); - scanelemdir[sizeof(scanelemdir)-1] = '\0'; - - dp = opendir(scanelemdir); - if (!dp) { - fprintf(stderr, "Enabling/disabling channels: can't open %s\n", - scanelemdir); - return -EIO; - } - - ret = -ENOENT; - while (ent = readdir(dp), ent) { - if (iioutils_check_suffix(ent->d_name, "_en")) { - printf("%sabling: %s\n", - enable ? "En" : "Dis", - ent->d_name); - ret = write_sysfs_int(ent->d_name, scanelemdir, - enable); - if (ret < 0) - fprintf(stderr, "Failed to enable/disable %s\n", - ent->d_name); - } - } - - if (closedir(dp) == -1) { - perror("Enabling/disabling channels: " - "Failed to close directory"); - return -errno; - } - return 0; -} - -void print_usage(void) -{ - fprintf(stderr, "Usage: generic_buffer [options]...\n" - "Capture, convert and output data from IIO device buffer\n" - " -a Auto-activate all available channels\n" - " -c <n> Do n conversions\n" - " -e Disable wait for event (new data)\n" - " -g Use trigger-less mode\n" - " -l <n> Set buffer length to n samples\n" - " -n <name> Set device name (mandatory)\n" - " -t <name> Set trigger name\n" - " -w <n> Set delay between reads in us (event-less mode)\n"); -} - -int main(int argc, char **argv) -{ - unsigned long num_loops = 2; - unsigned long timedelay = 1000000; - unsigned long buf_len = 128; - - int ret, c, i, j, toread; - int fp; - - int num_channels; - char *trigger_name = NULL, *device_name = NULL; - char *dev_dir_name, *buf_dir_name; - - int datardytrigger = 1; - char *data; - ssize_t read_size; - int dev_num, trig_num; - char *buffer_access; - int scan_size; - int noevents = 0; - int notrigger = 0; - enum autochan autochannels = AUTOCHANNELS_DISABLED; - char *dummy; - - struct iio_channel_info *channels; - - while ((c = getopt(argc, argv, "ac:egl:n:t:w:")) != -1) { - switch (c) { - case 'a': - autochannels = AUTOCHANNELS_ENABLED; - break; - case 'c': - errno = 0; - num_loops = strtoul(optarg, &dummy, 10); - if (errno) - return -errno; - - break; - case 'e': - noevents = 1; - break; - case 'g': - notrigger = 1; - break; - case 'l': - errno = 0; - buf_len = strtoul(optarg, &dummy, 10); - if (errno) - return -errno; - - break; - case 'n': - device_name = optarg; - break; - case 't': - trigger_name = optarg; - datardytrigger = 0; - break; - case 'w': - errno = 0; - timedelay = strtoul(optarg, &dummy, 10); - if (errno) - return -errno; - break; - case '?': - print_usage(); - return -1; - } - } - - if (!device_name) { - fprintf(stderr, "Device name not set\n"); - print_usage(); - return -1; - } - - /* Find the device requested */ - dev_num = find_type_by_name(device_name, "iio:device"); - if (dev_num < 0) { - fprintf(stderr, "Failed to find the %s\n", device_name); - return dev_num; - } - - printf("iio device number being used is %d\n", dev_num); - - ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num); - if (ret < 0) - return -ENOMEM; - - if (!notrigger) { - if (!trigger_name) { - /* - * Build the trigger name. If it is device associated - * its name is <device_name>_dev[n] where n matches - * the device number found above. - */ - ret = asprintf(&trigger_name, - "%s-dev%d", device_name, dev_num); - if (ret < 0) { - ret = -ENOMEM; - goto error_free_dev_dir_name; - } - } - - /* Look for this "-devN" trigger */ - trig_num = find_type_by_name(trigger_name, "trigger"); - if (trig_num < 0) { - /* OK try the simpler "-trigger" suffix instead */ - free(trigger_name); - ret = asprintf(&trigger_name, - "%s-trigger", device_name); - if (ret < 0) { - ret = -ENOMEM; - goto error_free_dev_dir_name; - } - } - - trig_num = find_type_by_name(trigger_name, "trigger"); - if (trig_num < 0) { - fprintf(stderr, "Failed to find the trigger %s\n", - trigger_name); - ret = trig_num; - goto error_free_triggername; - } - - printf("iio trigger number being used is %d\n", trig_num); - } else { - printf("trigger-less mode selected\n"); - } - - /* - * Parse the files in scan_elements to identify what channels are - * present - */ - 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_free_triggername; - } - if (num_channels && autochannels == AUTOCHANNELS_ENABLED) { - fprintf(stderr, "Auto-channels selected but some channels " - "are already activated in sysfs\n"); - fprintf(stderr, "Proceeding without activating any channels\n"); - } - - if (!num_channels && autochannels == AUTOCHANNELS_ENABLED) { - fprintf(stderr, - "No channels are enabled, enabling all channels\n"); - - ret = enable_disable_all_channels(dev_dir_name, 1); - if (ret) { - fprintf(stderr, "Failed to enable all channels\n"); - goto error_free_triggername; - } - - /* 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_disable_channels; - } - if (!num_channels) { - fprintf(stderr, "Still no channels after " - "auto-enabling, giving up\n"); - goto error_disable_channels; - } - } - - 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_free_triggername; - } - - /* - * 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_free_channels; - } - - 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_free_buf_dir_name; - } - } - - /* Setup ring buffer parameters */ - ret = write_sysfs_int("length", buf_dir_name, buf_len); - if (ret < 0) - goto error_free_buf_dir_name; - - /* 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_free_buf_dir_name; - } - - scan_size = size_from_channelarray(channels, num_channels); - data = malloc(scan_size * buf_len); - if (!data) { - ret = -ENOMEM; - goto error_free_buf_dir_name; - } - - ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num); - if (ret < 0) { - ret = -ENOMEM; - goto error_free_data; - } - - /* 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_free_buffer_access; - } - - for (j = 0; j < num_loops; j++) { - if (!noevents) { - struct pollfd pfd = { - .fd = fp, - .events = POLLIN, - }; - - ret = poll(&pfd, 1, -1); - if (ret < 0) { - ret = -errno; - goto error_close_buffer_access; - } 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); - } - - /* Stop the buffer */ - ret = write_sysfs_int("enable", buf_dir_name, 0); - if (ret < 0) - goto error_close_buffer_access; - - if (!notrigger) - /* Disconnect the trigger - just write a dummy name. */ - ret = write_sysfs_string("trigger/current_trigger", - dev_dir_name, "NULL"); - if (ret < 0) - fprintf(stderr, "Failed to write to %s\n", - dev_dir_name); - -error_close_buffer_access: - if (close(fp) == -1) - perror("Failed to close buffer"); - -error_free_buffer_access: - free(buffer_access); -error_free_data: - free(data); -error_free_buf_dir_name: - free(buf_dir_name); -error_free_channels: - for (i = num_channels - 1; i >= 0; i--) { - free(channels[i].name); - free(channels[i].generic_name); - } - free(channels); -error_free_triggername: - if (datardytrigger) - free(trigger_name); -error_disable_channels: - if (autochannels == AUTOCHANNELS_ACTIVE) { - ret = enable_disable_all_channels(dev_dir_name, 0); - if (ret) - fprintf(stderr, "Failed to disable all channels\n"); - } -error_free_dev_dir_name: - free(dev_dir_name); - - return ret; -} |