/* p2_3.c Toggling LED in C using Freescale header file register definitions. 
 * This program toggles green LED for 0.5 second ON and 0.5 second OFF.
 * The green LED is connected to PTB19.
 * The LEDs are low active (a '0' turns ON the LED).
 */

#include "C:\Freescale\CW MCU v10.5\MCU\ProcessorExpert\lib\Kinetis\iofiles\MKL25Z4.H"
/*
#include "C:\Freescale\KDS_1.0\eclipse\ProcessorExpert\lib\Kinetis\iofiles\MKL25Z4.H"
*/

int main (void) {
    void delayMs(int n);
    
    SIM_SCGC5 |= 0x400;         /* enable clock to Port B */
    PORTB_PCR19 = 0x100;        /* make PTB19 pin as GPIO */
    GPIOB_PDDR |= 0x80000;      /* make PTB19 as output pin */
    
    while (1) {
        GPIOB_PDOR &= ~0x80000; /* turn on green LED */
        delayMs(500);
        GPIOB_PDOR |= 0x80000;  /* turn off green LED */
        delayMs(500);
    }
}

/* Delay n milliseconds
 * The CPU core clock is set to MCGFLLCLK at 41.94 MHz in SystemInit().
 */
void delayMs(int n) {
    int i;
    int j;
    for(i = 0 ; i < n; i++)
        for (j = 0; j < 7000; j++) {}
}