From: John Tsiombikas <nuclear@mutantstargoat.com>
Date: Tue, 23 Jul 2019 16:43:05 +0000 (+0300)
Subject: added pin number commandline argument
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=rpipulser;a=commitdiff_plain;h=02b7b0b1a5e6daf8781bc43b8324b429d773a6a4

added pin number commandline argument
---

diff --git a/pulser.c b/pulser.c
index 6362d67..3a0bdf1 100644
--- a/pulser.c
+++ b/pulser.c
@@ -59,6 +59,13 @@ int main(int argc, char **argv)
 					}
 					break;
 
+				case 'p':
+					if(!argv[++i] || (pin = atoi(argv[i])) < 1 || pin >= 28) {
+						fprintf(stderr, "-p must be followed by a BCM pin number: 1-27\n");
+						return 1;
+					}
+					break;
+
 				case 'h':
 					print_usage(argv[0]);
 					return 0;
@@ -128,5 +135,6 @@ void print_usage(const char *argv0)
 	printf(" -n: number of pulses to emit (default: 1)\n");
 	printf(" -f: frequency of pulses in hz (default: 1)\n");
 	printf(" -d: duty cycle [1, 255] (default: 128)\n");
+	printf(" -p: BCM pin number [1, 27] (default: 24)\n");
 	printf(" -h: print usage and exit\n");
 }