Interrupt with KL25Z board using KDS - c++

Question

I am programming a microcontroller using Kinetis Design Studio(KDS) and i want to implement an interrupt such that at anytime during runtime if a specific I/O pin has a "high" level the microcontroller should stop working until the pin is back to "low" .
Any ideas?

Answer 1

Try this code from free scale forum
https://www.element14.com/community/community/designcenter/kinetis_kl2_freedom_board/blog/2015/08/21/kinetis-design-studio-30-kinetis-sdk-12-processor-expert-using-frdm-kl43z-quick-tutorial-on-gpio-interrupt-toggling-led-using-button-with-interrupt-logic
or
below is an usart interrupt code you can modify it
/* p6_4.c UART0 Receive using interrupt */
/* This program modifies p4_2.c to use interrupt to handle the UART0 receive.
Receiving any key from terminal emulator (TeraTerm) of the host PC to the UART0 on Freescale FRDM-KL25Z board.
UART0 is connected to openSDA debug agent and has a virtual connection to the host PC COM port.
Launch TeraTerm on a PC and hit any key.
The LED program from P2_7 of Chapter 2 is used to turn on the tri-color LEDs according to the key received.
By default in SystemInit(), FLL clock output is 41.94 MHz.
Setting BDH=0, BDL=0x17, and OSR=0x0F yields 115200 Baud. */
#include <MKL25Z4.H>
void UART0_init(void);
void delayMs(int n);
void LED_init(void);
void LED_set(char value);
int i=0;
int main (void) {
__disable_irq(); /* global disable IRQs */
UART0_init();
LED_init();
__enable_irq(); /* global enable IRQs */
while (1) {
/* UART0 receive is moved to interrupt handler*/
}
}
/* UART0 interrupt handler */
void UART0_IRQHandler(void)
{
char c;
c = UART0->D; /* read the char received */
LED_set(c); /* and use it to set LEDs */
}
/* initialize UART0 to receive at 115200 Baud */
void UART0_init(void)
{
SIM->SCGC4 |= 0x0400; /* enable clock for UART0 */
SIM->SOPT2 |= 0x04000000; /* use FLL output for UART Baud rate generator */
UART0->C2 = 0; /* turn off UART0 while changing configurations */
UART0->BDH = 0x00;
UART0->BDL = 0x17; /* 115200 Baud */
UART0->C4 = 0x0F; /* Over Sampling Ratio 16 */
UART0->C1 = 0x00; /* 8-bit data */
UART0->C2 = 0x24; /* enable receive and receive interrupt*/
NVIC->ISER[0] |= 0x00001000; /* enable INT12 (bit 12 of ISER[0]) */
SIM->SCGC5 |= 0x0200; /* enable clock for PORTA */
PORTA->PCR[1] = 0x0200; /* make PTA1 UART0_Rx pin */
}
/* initialize all three LEDs on the FRDM board */
void LED_init(void)
{
SIM->SCGC5 |= 0x400; /* enable clock to Port B */
SIM->SCGC5 |= 0x1000; /* enable clock to Port D */
PORTB->PCR[18] = 0x100; /* make PTB18 pin as GPIO */
PTB->PDDR |= 0x40000; /* make PTB18 as output pin */
PTB->PSOR |= 0x40000; /* turn off red LED */
PORTB->PCR[19] = 0x100; /* make PTB19 pin as GPIO */
PTB->PDDR |= 0x80000; /* make PTB19 as output pin */
PTB->PSOR |= 0x80000; /* turn off green LED */
PORTD->PCR[1] = 0x100; /* make PTD1 pin as GPIO */
PTD->PDDR |= 0x02; /* make PTD1 as output pin */
PTD->PSOR |= 0x02; /* turn off blue LED */
}
/* turn on or off the LEDs according to bit 2-0 of the value */
void LED_set(char value)
{
if (value=='c')
{ /* use bit 1 of value to control green LED */
PTB->PCOR = 0x80000; /* turn on green LED */
s }
if (~(value=='c') )
{ /* use bit 1 of value to control green LED */
PTB->PSOR = 0x80000; /* turn off green LED */
}
}