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examples/gpio.c: Added command to monitor pin level changes using ISR

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Signed-off-by: Henry Bruce <henry.bruce@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Henry Bruce
2015-02-05 15:48:42 -08:00
committed by Brendan Le Foll
parent 7b213b6393
commit 403424e4c0
1 changed files with 57 additions and 10 deletions
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67
examples/gpio.c
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@@ -28,8 +28,14 @@
#include "mraa/gpio.h"
struct gpio_source {
int pin;
mraa_gpio_context context;
};
char* board_name;
void
print_version() {
fprintf(stdout, "Version %s on %s\n", mraa_get_version(), board_name);
@@ -40,16 +46,14 @@ print_help() {
fprintf(stdout, "list List pins\n");
fprintf(stdout, "set pin level Set pin to level (0/1)\n");
fprintf(stdout, "get pin Get pin level\n");
fprintf(stdout, "monitor pin Monitor pin level changes\n");
fprintf(stdout, "version Get mraa version and board name\n");
}
void
print_command_error() {
fprintf(stdout, "Invalid command, options are:\n");
fprintf(stdout, "list List pins\n");
fprintf(stdout, "set pin level Set pin to level (0/1)\n");
fprintf(stdout, "get pin Get pin level\n");
fprintf(stdout, "version Get mraa version and board name\n");
print_help();
}
void
@@ -63,15 +67,15 @@ list_pins() {
for (i = 0; i < pin_count; ++i) {
fprintf(stdout, "%02d ", i);
if (mraa_pin_mode_test(i, MRAA_PIN_GPIO))
fprintf(stdout, "GPIO");
fprintf(stdout, "GPIO ");
if (mraa_pin_mode_test(i, MRAA_PIN_I2C))
fprintf(stdout, "I2C");
fprintf(stdout, "I2C ");
if (mraa_pin_mode_test(i, MRAA_PIN_SPI))
fprintf(stdout, "SPI");
fprintf(stdout, "SPI ");
if (mraa_pin_mode_test(i, MRAA_PIN_PWM))
fprintf(stdout, "PWM");
fprintf(stdout, "PWM ");
if (mraa_pin_mode_test(i, MRAA_PIN_UART))
fprintf(stdout, "UART");
fprintf(stdout, "UART ");
fprintf(stdout, "\n");
}
}
@@ -98,6 +102,34 @@ gpio_get(int pin, int* level) {
return MRAA_ERROR_INVALID_RESOURCE;
}
void gpio_isr_handler(void * args) {
struct gpio_source* gpio_info = (struct gpio_source*)args;
int level = mraa_gpio_read(gpio_info->context);
fprintf(stdout, "Pin %d = %d\n", gpio_info->pin, level);
}
mraa_result_t
gpio_isr_start(struct gpio_source* gpio_info) {
gpio_info->context = mraa_gpio_init(gpio_info->pin);
if (gpio_info->context != NULL) {
mraa_result_t status = mraa_gpio_dir(gpio_info->context, MRAA_GPIO_IN);
if (status == MRAA_SUCCESS)
status = mraa_gpio_isr(gpio_info->context, MRAA_GPIO_EDGE_BOTH, &gpio_isr_handler, gpio_info);
return status;
} else
return MRAA_ERROR_INVALID_RESOURCE;
}
mraa_result_t
gpio_isr_stop(struct gpio_source* gpio_info) {
mraa_gpio_isr_exit(gpio_info->context);
mraa_gpio_close(gpio_info->context);
return MRAA_SUCCESS;
}
int
main(int argc, char **argv)
{
@@ -134,7 +166,22 @@ main(int argc, char **argv)
fprintf(stdout, "Could not initialize gpio %d\n", pin);
} else
print_command_error();
} else {
} else if (strcmp(argv[1], "monitor") == 0) {
if (argc == 3) {
int pin = atoi(argv[2]);
struct gpio_source gpio_info;
gpio_info.pin = pin;
if (gpio_isr_start(&gpio_info) == MRAA_SUCCESS) {
fprintf(stdout, "Monitoring level changes to pin %d. Press RETURN to exit.\n", pin);
gpio_isr_handler(&gpio_info);
getchar();
gpio_isr_stop(&gpio_info);
}
else
fprintf(stdout, "Failed to register ISR for pin %d\n", pin);
} else
print_command_error();
} else {
print_command_error();
}
}