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;
}
