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modified post 96c3 by Anonymous on Fri 13th Dec 2019 14:57
original post 226d8e2 by Anonymous on Fri 13th Dec 2019 14:55
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/*

1	1		/*
2	2		* qaweep1.c - Quantron beeper-weeper demo V0.0.1
3	3		*
4	4		* Written by Roland Mainz <r.mainz@eckelmann.de>
5	5		*/
6	6
7	7		/*
8	8		* Compile with
9	9		* $ /opt/OSELAS.Toolchain-2012.12.0/arm-v5te-linux-gnueabi/gcc-4.7.2-glibc-2.16.0-binutils-2.22-kernel-3.6-sanitized/bin/arm-v5te-linux-gnueabi-gcc -std=gnu99 -g -Wall -fno-use-linker-plugin qaweep1.c
10	10		*/
11	11		#include <errno.h>
12	12		#include <fcntl.h>
13	13		#include <stdio.h>
14	14		#include <stdlib.h>
15	15		#include <sys/stat.h>
16	16		#include <sys/types.h>
17	17		#include <unistd.h>
18	18
19	19		#define NUM_ELEMENTS_IN_ARRAY(ar) (sizeof(ar) / sizeof (ar[0]))
20	20		const double freqs[] = {
21	21		440.0000,
22	22		466.1638,
23	23		493.8833,
24	24		523.2511,
25	25		554.3653,
26	26		587.3295,
27	27		622.2540,
28	28		659.2551,
29	29		698.4565,
30	30		739.9888,
31	31		783.9909,
32	32		830.6094,
33	33		880.0000,
34	34		932.3275,
35	35		987.7666,
36	36		1046.502,
37	37		1108.731,
38	38		1174.659,
39	39		1244.508
40	40		};
41	41
42	42		#define MICROSECONDS_PER_SEC (1000000L)
43	43
44	44		static
45	45		int cycle_loop(int fd, long cycles, long low_delay, long high_delay)
46	46		{
47		-	int retval = 0;
48	47		int i;
49	48
50	49		for (i = 0; i < cycles; i++) {
51		-	if (write(fd, "1", 1) != 1) {
	50	+	if (write(fd, "1", 1) != 1)
52		-	goto exit_ioerr;
	51	+	return 0;
54	52
55	53		(void)usleep(low_delay);
56	54
57		-	if (write(fd, "0", 1) != 1) {
	55	+	if (write(fd, "0", 1) != 1)
58		-	goto exit_ioerr;
	56	+	return 0;
60	57
61	58		(void)usleep(high_delay);
62	59		}
63	60
64		-	retval = 1;
	61	+	return 1;
	62	+	}
66	63
	64	+	int main(int ac, char *av[])