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Diffstat (limited to 'src/systemcmds/pwm/pwm.c')
| -rw-r--r-- | src/systemcmds/pwm/pwm.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/src/systemcmds/pwm/pwm.c b/src/systemcmds/pwm/pwm.c new file mode 100644 index 000000000..de7a53199 --- /dev/null +++ b/src/systemcmds/pwm/pwm.c @@ -0,0 +1,233 @@ +/**************************************************************************** + * + * Copyright (C) 2013 PX4 Development Team. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name PX4 nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/** + * @file pwm.c + * + * PWM servo output configuration and monitoring tool. + */ + +#include <nuttx/config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <stdbool.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/mount.h> +#include <sys/ioctl.h> +#include <sys/stat.h> + +#include <nuttx/i2c.h> +#include <nuttx/mtd.h> +#include <nuttx/fs/nxffs.h> +#include <nuttx/fs/ioctl.h> + +#include <arch/board/board.h> + +#include "systemlib/systemlib.h" +#include "systemlib/err.h" +#include "drivers/drv_pwm_output.h" + +static void usage(const char *reason); +__EXPORT int pwm_main(int argc, char *argv[]); + + +static void +usage(const char *reason) +{ + if (reason != NULL) + warnx("%s", reason); + errx(1, + "usage:\n" + "pwm [-v] [-d <device>] [-u <alt_rate>] [-c <channel group>] [arm|disarm] [<channel_value> ...]\n" + " -v Print information about the PWM device\n" + " <device> PWM output device (defaults to " PWM_OUTPUT_DEVICE_PATH ")\n" + " <alt_rate> PWM update rate for channels in <alt_channel_mask>\n" + " <channel_group> Channel group that should update at the alternate rate (may be specified more than once)\n" + " arm | disarm Arm or disarm the ouptut\n" + " <channel_value>... PWM output values in microseconds to assign to the PWM outputs\n" + "\n" + "When -c is specified, any channel groups not listed with -c will update at the default rate.\n" + ); + +} + +int +pwm_main(int argc, char *argv[]) +{ + const char *dev = PWM_OUTPUT_DEVICE_PATH; + unsigned alt_rate = 0; + uint32_t alt_channel_groups = 0; + bool alt_channels_set = false; + bool print_info = false; + int ch; + int ret; + char *ep; + unsigned group; + + if (argc < 2) + usage(NULL); + + while ((ch = getopt(argc, argv, "c:d:u:v")) != EOF) { + switch (ch) { + case 'c': + group = strtoul(optarg, &ep, 0); + if ((*ep != '\0') || (group >= 32)) + usage("bad channel_group value"); + alt_channel_groups |= (1 << group); + alt_channels_set = true; + break; + + case 'd': + dev = optarg; + break; + + case 'u': + alt_rate = strtol(optarg, &ep, 0); + if (*ep != '\0') + usage("bad alt_rate value"); + break; + + case 'v': + print_info = true; + break; + + default: + usage(NULL); + } + } + argc -= optind; + argv += optind; + + /* open for ioctl only */ + int fd = open(dev, 0); + if (fd < 0) + err(1, "can't open %s", dev); + + /* change alternate PWM rate */ + if (alt_rate > 0) { + ret = ioctl(fd, PWM_SERVO_SET_UPDATE_RATE, alt_rate); + if (ret != OK) + err(1, "PWM_SERVO_SET_UPDATE_RATE (check rate for sanity)"); + } + + /* assign alternate rate to channel groups */ + if (alt_channels_set) { + uint32_t mask = 0; + + for (unsigned group = 0; group < 32; group++) { + if ((1 << group) & alt_channel_groups) { + uint32_t group_mask; + + ret = ioctl(fd, PWM_SERVO_GET_RATEGROUP(group), (unsigned long)&group_mask); + if (ret != OK) + err(1, "PWM_SERVO_GET_RATEGROUP(%u)", group); + + mask |= group_mask; + } + } + + ret = ioctl(fd, PWM_SERVO_SELECT_UPDATE_RATE, mask); + if (ret != OK) + err(1, "PWM_SERVO_SELECT_UPDATE_RATE"); + } + + /* iterate remaining arguments */ + unsigned channel = 0; + while (argc--) { + const char *arg = argv[0]; + argv++; + if (!strcmp(arg, "arm")) { + ret = ioctl(fd, PWM_SERVO_ARM, 0); + if (ret != OK) + err(1, "PWM_SERVO_ARM"); + continue; + } + if (!strcmp(arg, "disarm")) { + ret = ioctl(fd, PWM_SERVO_DISARM, 0); + if (ret != OK) + err(1, "PWM_SERVO_DISARM"); + continue; + } + unsigned pwm_value = strtol(arg, &ep, 0); + if (*ep == '\0') { + ret = ioctl(fd, PWM_SERVO_SET(channel), pwm_value); + if (ret != OK) + err(1, "PWM_SERVO_SET(%d)", channel); + channel++; + continue; + } + usage("unrecognised option"); + } + + /* print verbose info */ + if (print_info) { + /* get the number of servo channels */ + unsigned count; + ret = ioctl(fd, PWM_SERVO_GET_COUNT, (unsigned long)&count); + if (ret != OK) + err(1, "PWM_SERVO_GET_COUNT"); + + /* print current servo values */ + for (unsigned i = 0; i < count; i++) { + servo_position_t spos; + + ret = ioctl(fd, PWM_SERVO_GET(i), (unsigned long)&spos); + if (ret == OK) { + printf("channel %u: %uus\n", i, spos); + } else { + printf("%u: ERROR\n", i); + } + } + + /* print rate groups */ + for (unsigned i = 0; i < count; i++) { + uint32_t group_mask; + + ret = ioctl(fd, PWM_SERVO_GET_RATEGROUP(i), (unsigned long)&group_mask); + if (ret != OK) + break; + if (group_mask != 0) { + printf("channel group %u: channels", i); + for (unsigned j = 0; j < 32; j++) + if (group_mask & (1 << j)) + printf(" %u", j); + printf("\n"); + } + } + fflush(stdout); + } + exit(0); +}
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