Flashing LEDs on FRDM-K22F

[jverive]

The following has been debugged in KDS v1.1.1 with KSDK v1.0.0. It flashes the Green, Red, and Blue LEDs in succession, looping forever. It has been tested on a FRDM-K22F, and is commented to explain operation. It is a very simple program that shows how to use GPIO pins as outputs.

#include "fsl_device_registers.h"

#include "board.h"

static int i = 0;

int main(void)

{

  // LEDs are common-anode, with cathodes connected to port pins.

  // Therefore, logic high (1) turns them off, and logic low

  // (0) turns them on.

  short OFF = 1;

  short ON = 0;

     hardware_init();

     GPIO_DRV_SetPinDir(kGpioLED1, kGpioDigitalOutput); //Green LED

     GPIO_DRV_SetPinDir(kGpioLED2, kGpioDigitalOutput); //Red LED

     GPIO_DRV_SetPinDir(kGpioLED3, kGpioDigitalOutput); //Blue LED

     GPIO_DRV_WritePinOutput(kGpioLED1, OFF); //Green LED initially off

     GPIO_DRV_WritePinOutput(kGpioLED2, OFF); //Red LED initially off

     GPIO_DRV_WritePinOutput(kGpioLED3, OFF); //Blue LED initially off

     while (1)

          {

          for (i = 0; i<0xFFFFFF; i++)

          {

          }

          GPIO_DRV_WritePinOutput(kGpioLED1, ON); //Green LED on

          for (i = 0; i<0xFFFFFF; i++)

          {

          }

          GPIO_DRV_WritePinOutput(kGpioLED1, OFF); //Green LED off

          for (i = 0; i<0xFFFFFF; i++)

          {

          }

          GPIO_DRV_WritePinOutput(kGpioLED2, ON); //Red LED on

          for (i = 0; i<0xFFFFFF; i++)

          {

          }

          GPIO_DRV_WritePinOutput(kGpioLED2, OFF); //Red LED off

          for (i = 0; i<0xFFFFFF; i++)

          {

          };

          GPIO_DRV_WritePinOutput(kGpioLED3, ON); //Blue LED on

          for (i = 0; i<0xFFFFFF; i++)

          {

          }

          GPIO_DRV_WritePinOutput(kGpioLED3, OFF); //Blue LED off

          }

     return 0;

}