diff options
Diffstat (limited to 'apps/systemcmds/led/led.c')
| -rw-r--r-- | apps/systemcmds/led/led.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/apps/systemcmds/led/led.c b/apps/systemcmds/led/led.c index 7a1faa618..15d448118 100644 --- a/apps/systemcmds/led/led.c +++ b/apps/systemcmds/led/led.c @@ -121,6 +121,7 @@ usage(const char *reason) { if (reason) fprintf(stderr, "%s\n", reason); + fprintf(stderr, "usage: led {start|stop|status} [-d <UART>]\n\n"); exit(1); } @@ -129,7 +130,7 @@ usage(const char *reason) * The deamon app only briefly exists to start * the background job. The stack size assigned in the * Makefile does only apply to this management task. - * + * * The actual stack size should be set in the call * to task_create(). */ @@ -165,9 +166,11 @@ int led_main(int argc, char *argv[]) if (!strcmp(argv[1], "status")) { if (thread_running) { printf("\tled is running\n"); + } else { printf("\tled not started\n"); } + exit(0); } @@ -187,7 +190,7 @@ int led_thread_main(int argc, char *argv[]) while (!thread_should_exit) { /* swell blue led */ - + /* 200 Hz base loop */ usleep(1000000 / rate); |