External Digital I/O Example

This example demonstrates how to set/get the level of an External Digital I/O pin. First, it will set the pin HIGH and read the level of the pin. The expected read value is HIGH. Finally, it will set the pin LOW and read the level of the pin. The expected read value is LOW.

 
#include <stdio.h>
#include "flex.h"
 
#define APPLICATION_NAME "External Digital I/O Example"
 
// Note: change this to the required External Digital I/O Pin.
// Available pins are given in enum FLEX_DigitalIOPin.
#define DIGITAL_IO_PIN FLEX_EXT_DIGITAL_IO_1
 
const char* get_digital_io_level_str(const FLEX_DigitalIOLevel Level) {
  return (Level == FLEX_EXT_DIGITAL_IO_HIGH) ? "HIGH" : "LOW";
}
 
static time_t DigitalIOExample(void) {
  for (int i = 0; i < 2; i++) {
    const FLEX_DigitalIOLevel set_level_val =
      (i % 2) ? FLEX_EXT_DIGITAL_IO_LOW : FLEX_EXT_DIGITAL_IO_HIGH;
 
    printf("Setting: External Digital IO Pin %d to %s\n", DIGITAL_IO_PIN + 1,
      get_digital_io_level_str(set_level_val));
    FLEX_ExtDigitalIOSet(DIGITAL_IO_PIN, set_level_val);
 
    const FLEX_DigitalIOLevel get_level_val = FLEX_ExtDigitalIOGet(DIGITAL_IO_PIN);
    printf("Reading: External Digital IO Pin %d level is %s\n", DIGITAL_IO_PIN + 1,
      get_digital_io_level_str(get_level_val));
  }
 
  return FLEX_Never();
}
 
void FLEX_AppInit() {
  printf("%s\n", APPLICATION_NAME);
  FLEX_JobSchedule(DigitalIOExample, FLEX_ASAP());
}