This commit is contained in:
joan 2014-11-25 13:24:49 +00:00
parent 14e3a1b0fd
commit a723db6efc
6 changed files with 504 additions and 2 deletions

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A program showing how to use the gpioSetAlertFunc function to set a callback for gpio state changes.
A frequency count is generated for each monitored gpio (frequencies up to 500KHz and beyond).

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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <pigpio.h>
/*
2014-08-20
gcc -o freq_count_1 freq_count_1.c -lpigpio -lpthread
$ sudo ./freq_count_1 4 7 8
This program uses the gpioSetAlertFunc function to request
a callback (the same one) for each gpio to be monitored.
EXAMPLES
Monitor gpio 4 (default settings)
sudo ./freq_count_1 4
Monitor gpios 4 and 8 (default settings)
sudo ./freq_count_1 4 8
Monitor gpios 4 and 8, sample rate 2 microseconds
sudo ./freq_count_1 4 8 -s2
Monitor gpios 7 and 8, sample rate 4 microseconds, report every second
sudo ./freq_count_1 7 8 -s4 -r10
Monitor gpios 4,7, 8, 9, 10, 23 24, report five times a second
sudo ./freq_count_1 4 7 8 9 10 23 24 -r2
Monitor gpios 4, 7, 8, and 9, report once a second, sample rate 1us,
generate 2us edges (4us square wave, 250000 highs per second).
sudo ./freq_count_1 4 7 8 9 -r 10 -s 1 -p 2
*/
#define MAX_GPIOS 32
#define OPT_P_MIN 1
#define OPT_P_MAX 1000
#define OPT_P_DEF 20
#define OPT_R_MIN 1
#define OPT_R_MAX 10
#define OPT_R_DEF 5
#define OPT_S_MIN 1
#define OPT_S_MAX 10
#define OPT_S_DEF 5
static volatile int g_pulse_count[MAX_GPIOS];
static volatile int g_reset_counts;
static uint32_t g_mask;
static int g_num_gpios;
static int g_gpio[MAX_GPIOS];
static int g_opt_p = OPT_P_DEF;
static int g_opt_r = OPT_R_DEF;
static int g_opt_s = OPT_S_DEF;
static int g_opt_t = 0;
void usage()
{
fprintf
(stderr,
"\n" \
"Usage: sudo ./freq_count_1 gpio ... [OPTION] ...\n" \
" -p value, sets pulses every p micros, %d-%d, TESTING only\n" \
" -r value, sets refresh period in deciseconds, %d-%d, default %d\n" \
" -s value, sets sampling rate in micros, %d-%d, default %d\n" \
"\nEXAMPLE\n" \
"sudo ./freq_count_1 4 7 -r2 -s2\n" \
"Monitor gpios 4 and 7. Refresh every 0.2 seconds. Sample rate 2 micros.\n" \
"\n",
OPT_P_MIN, OPT_P_MAX,
OPT_R_MIN, OPT_R_MAX, OPT_R_DEF,
OPT_S_MIN, OPT_S_MAX, OPT_S_DEF
);
}
void fatal(int show_usage, char *fmt, ...)
{
char buf[128];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
fprintf(stderr, "%s\n", buf);
if (show_usage) usage();
fflush(stderr);
exit(EXIT_FAILURE);
}
static int initOpts(int argc, char *argv[])
{
int i, opt;
while ((opt = getopt(argc, argv, "p:r:s:")) != -1)
{
i = -1;
switch (opt)
{
case 'p':
i = atoi(optarg);
if ((i >= OPT_P_MIN) && (i <= OPT_P_MAX))
g_opt_p = i;
else fatal(1, "invalid -p option (%d)", i);
g_opt_t = 1;
break;
case 'r':
i = atoi(optarg);
if ((i >= OPT_R_MIN) && (i <= OPT_R_MAX))
g_opt_r = i;
else fatal(1, "invalid -r option (%d)", i);
break;
case 's':
i = atoi(optarg);
if ((i >= OPT_S_MIN) && (i <= OPT_S_MAX))
g_opt_s = i;
else fatal(1, "invalid -s option (%d)", i);
break;
default: /* '?' */
usage();
exit(-1);
}
}
return optind;
}
void edges(int gpio, int level, uint32_t tick)
{
int g;
if (g_reset_counts)
{
g_reset_counts = 0;
for (g=0; g<MAX_GPIOS; g++) g_pulse_count[g] = 0;
}
/* only record low to high edges */
if (level == 1) g_pulse_count[gpio]++;
}
int main(int argc, char *argv[])
{
int i, rest, g, wave_id, mode;
gpioPulse_t pulse[2];
int count[MAX_GPIOS];
/* command line parameters */
rest = initOpts(argc, argv);
/* get the gpios to monitor */
g_num_gpios = 0;
for (i=rest; i<argc; i++)
{
g = atoi(argv[i]);
if ((g>=0) && (g<32))
{
g_gpio[g_num_gpios++] = g;
g_mask |= (1<<g);
}
else fatal(1, "%d is not a valid g_gpio number\n", g);
}
if (!g_num_gpios) fatal(1, "At least one gpio must be specified");
printf("Monitoring gpios");
for (i=0; i<g_num_gpios; i++) printf(" %d", g_gpio[i]);
printf("\nSample rate %d micros, refresh rate %d deciseconds\n",
g_opt_s, g_opt_r);
gpioCfgClock(g_opt_s, 1, 1);
if (gpioInitialise()<0) return 1;
gpioWaveClear();
pulse[0].gpioOn = g_mask;
pulse[0].gpioOff = 0;
pulse[0].usDelay = g_opt_p;
pulse[1].gpioOn = 0;
pulse[1].gpioOff = g_mask;
pulse[1].usDelay = g_opt_p;
gpioWaveAddGeneric(2, pulse);
wave_id = gpioWaveCreate();
/* monitor g_gpio level changes */
for (i=0; i<g_num_gpios; i++) gpioSetAlertFunc(g_gpio[i], edges);
mode = PI_INPUT;
if (g_opt_t)
{
gpioWaveTxSend(wave_id, PI_WAVE_MODE_REPEAT);
mode = PI_OUTPUT;
}
for (i=0; i<g_num_gpios; i++) gpioSetMode(g_gpio[i], mode);
while (1)
{
for (i=0; i<g_num_gpios; i++) count[i] = g_pulse_count[g_gpio[i]];
g_reset_counts = 1;
for (i=0; i<g_num_gpios; i++)
{
printf(" %d=%d", g_gpio[i], count[i]);
}
printf("\n");
gpioDelay(g_opt_r * 100000);
}
gpioTerminate();
}

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A program showing how to use the gpioSetGetSamplesFunc function to set a callback for accumulated gpio state changes over the last millisecond.
A frequency count is generated for each monitored gpio (frequencies up to 500KHz and beyond).
Generally the method used is more complicated but more efficient than frequency counter 1.

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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <pigpio.h>
/*
2014-08-20
gcc -o freq_count_2 freq_count_2.c -lpigpio -lpthread
$ sudo ./freq_count_2 4 7 8
This program uses the gpioSetGetSamplesFunc function to request
a callback once a millisecond for all accumulated gpio changes
in that millisecond.
This tends to be more efficient then calling a callback for each
gpio change during the millisecond.
EXAMPLES
Monitor gpio 4 (default settings)
sudo ./freq_count_2 4
Monitor gpios 4 and 8 (default settings)
sudo ./freq_count_2 4 8
Monitor gpios 4 and 8, sample rate 2 microseconds
sudo ./freq_count_2 4 8 -s2
Monitor gpios 7 and 8, sample rate 4 microseconds, report every second
sudo ./freq_count_2 7 8 -s4 -r10
Monitor gpios 4,7, 8, 9, 10, 23 24, report five times a second
sudo ./freq_count_2 4 7 8 9 10 23 24 -r2
Monitor gpios 4, 7, 8, and 9, report once a second, sample rate 1us,
generate 2us edges (4us square wave, 250000 highs per second).
sudo ./freq_count_2 4 7 8 9 -r 10 -s 1 -p 2
*/
#define MAX_GPIOS 32
#define OPT_P_MIN 1
#define OPT_P_MAX 1000
#define OPT_P_DEF 20
#define OPT_R_MIN 1
#define OPT_R_MAX 10
#define OPT_R_DEF 5
#define OPT_S_MIN 1
#define OPT_S_MAX 10
#define OPT_S_DEF 5
static volatile int g_pulse_count[MAX_GPIOS];
static volatile int g_reset_counts;
static uint32_t g_mask;
static int g_num_gpios;
static int g_gpio[MAX_GPIOS];
static int g_opt_p = OPT_P_DEF;
static int g_opt_r = OPT_R_DEF;
static int g_opt_s = OPT_S_DEF;
static int g_opt_t = 0;
void usage()
{
fprintf
(stderr,
"\n" \
"Usage: sudo ./freq_count_2 gpio ... [OPTION] ...\n" \
" -p value, sets pulses every p micros, %d-%d, TESTING only\n" \
" -r value, sets refresh period in deciseconds, %d-%d, default %d\n" \
" -s value, sets sampling rate in micros, %d-%d, default %d\n" \
"\nEXAMPLE\n" \
"sudo ./freq_count_2 4 7 -r2 -s2\n" \
"Monitor gpios 4 and 7. Refresh every 0.2 seconds. Sample rate 2 micros.\n" \
"\n",
OPT_P_MIN, OPT_P_MAX,
OPT_R_MIN, OPT_R_MAX, OPT_R_DEF,
OPT_S_MIN, OPT_S_MAX, OPT_S_DEF
);
}
void fatal(int show_usage, char *fmt, ...)
{
char buf[128];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
fprintf(stderr, "%s\n", buf);
if (show_usage) usage();
fflush(stderr);
exit(EXIT_FAILURE);
}
static int initOpts(int argc, char *argv[])
{
int i, opt;
while ((opt = getopt(argc, argv, "p:r:s:")) != -1)
{
i = -1;
switch (opt)
{
case 'p':
i = atoi(optarg);
if ((i >= OPT_P_MIN) && (i <= OPT_P_MAX))
g_opt_p = i;
else fatal(1, "invalid -p option (%d)", i);
g_opt_t = 1;
break;
case 'r':
i = atoi(optarg);
if ((i >= OPT_R_MIN) && (i <= OPT_R_MAX))
g_opt_r = i;
else fatal(1, "invalid -r option (%d)", i);
break;
case 's':
i = atoi(optarg);
if ((i >= OPT_S_MIN) && (i <= OPT_S_MAX))
g_opt_s = i;
else fatal(1, "invalid -s option (%d)", i);
break;
default: /* '?' */
usage();
exit(-1);
}
}
return optind;
}
void samples(const gpioSample_t *samples, int numSamples)
{
static uint32_t state = 0;
uint32_t high, level;
int g, s;
if (g_reset_counts)
{
g_reset_counts = 0;
for (g=0; g<g_num_gpios; g++) g_pulse_count[g] = 0;
}
for (s=0; s<numSamples; s++)
{
level = samples[s].level;
high = ((state ^ level) & g_mask) & level;
state = level;
/* only interested in low to high */
if (high)
{
for (g=0; g<g_num_gpios; g++)
{
if (high & (1<<g_gpio[g])) g_pulse_count[g]++;
}
}
}
}
int main(int argc, char *argv[])
{
int i, rest, g, wave_id, mode;
gpioPulse_t pulse[2];
int count[MAX_GPIOS];
/* command line parameters */
rest = initOpts(argc, argv);
/* get the gpios to monitor */
g_num_gpios = 0;
for (i=rest; i<argc; i++)
{
g = atoi(argv[i]);
if ((g>=0) && (g<32))
{
g_gpio[g_num_gpios++] = g;
g_mask |= (1<<g);
}
else fatal(1, "%d is not a valid g_gpio number\n", g);
}
if (!g_num_gpios) fatal(1, "At least one gpio must be specified");
printf("Monitoring gpios");
for (i=0; i<g_num_gpios; i++) printf(" %d", g_gpio[i]);
printf("\nSample rate %d micros, refresh rate %d deciseconds\n",
g_opt_s, g_opt_r);
gpioCfgClock(g_opt_s, 1, 1);
if (gpioInitialise()<0) return 1;
gpioWaveClear();
pulse[0].gpioOn = g_mask;
pulse[0].gpioOff = 0;
pulse[0].usDelay = g_opt_p;
pulse[1].gpioOn = 0;
pulse[1].gpioOff = g_mask;
pulse[1].usDelay = g_opt_p;
gpioWaveAddGeneric(2, pulse);
wave_id = gpioWaveCreate();
/* monitor g_gpio level changes */
gpioSetGetSamplesFunc(samples, g_mask);
mode = PI_INPUT;
if (g_opt_t)
{
gpioWaveTxSend(wave_id, PI_WAVE_MODE_REPEAT);
mode = PI_OUTPUT;
}
for (i=0; i<g_num_gpios; i++) gpioSetMode(g_gpio[i], mode);
while (1)
{
for (i=0; i<g_num_gpios; i++) count[i] = g_pulse_count[i];
g_reset_counts = 1;
for (i=0; i<g_num_gpios; i++)
{
printf(" %d=%d", g_gpio[i], count[i]);
}
printf("\n");
gpioDelay(g_opt_r * 100000);
}
gpioTerminate();
}

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pigpio C examples

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Placeholder