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io.c
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io.c
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#include <stdio.h>
#include <syslog.h>
#include <unistd.h>
#include <mraa.h>
mraa_gpio_context out;
volatile int mutex = 0;
void interrupt_in(void *arg)
{
mraa_gpio_context dev = (mraa_gpio_context)arg;
if(mutex == 0){
mutex = 1;
system("clear");
if(mraa_gpio_read(dev) == 1){
mraa_gpio_write(out, 1);
printf("Released\r\n");
}else{
mraa_gpio_write(out, 0);
printf("Pressed\r\n");
}
mutex = 0;
}
}
int main(int argc, char *argv[])
{
mraa_init();
fprintf(stdout, "Hello mraa.\nVersion: %s\n", mraa_get_version());
// LED
out = mraa_gpio_init(20);
if(out == NULL){
printf("Error: init out.\r\n");
return 1;
}
mraa_gpio_dir(out, MRAA_GPIO_OUT);
// Switch
mraa_gpio_context in = mraa_gpio_init(14);
if(in == NULL){
printf("Error: init in.\r\n");
return 1;
}
mraa_gpio_dir(in, MRAA_GPIO_IN);
mraa_gpio_mode(in, MRAA_GPIO_PULLUP);
// 割込関数の登録
mraa_gpio_isr(in, MRAA_GPIO_EDGE_BOTH, interrupt_in, (void *)in);
while(1) {}
mraa_gpio_isr_exit(in);
mraa_gpio_close(in);
mraa_gpio_close(out);
mraa_deinit();
return 0;
}