topic Re: Blinking LED on KL25Z - KDS in Kinetis Microcontrollers

Blinking LED on KL25Z - KDS

wojciech22a — Tue, 28 Jul 2015 15:00:41 GMT

I wrote a program for blinking LED. The program does not work:

#include "Cpu.h"

#include "Events.h"

//#include "Bit.h"

/* Including shared modules, which are used for whole project */

#include "PE_Types.h"

#include "PE_Error.h"

#include "PE_Const.h"

#include "IO_Map.h"

void opz(int ile)

{

int p;

for(p=0;p<ile;p++)

{

}

void ledkonf(void)

{

PORTB_PCR18=PORTB_PCR18 &~(1<<10) &~(1<<9) | (1<<8);

GPIOB_PDDR=GPIOB_PDDR | (1<<18);

}

void swiec(void)

{

opz(100000);

GPIOB_PDOR=GPIOB_PDOR|(1<<18);

opz(100000);

GPIOB_PTOR=GPIOB_PTOR|(1<<18);

opz(100000);

}

int main(void)

{

#ifdef PEX_RTOS_START

PEX_RTOS_START(); /* Startup of the selected RTOS. Macro is defined by the RTOS component. */

#endif

ledkonf();

for(;;){

swiec();

}

But when I added element BitIO_LDD in the Processor Expert, the program works, and the only new element of the program is generated file Bit.h. When I create a project without Processor Expert, the program does not work either. Why is it like that? Please help!

Re: Blinking LED on KL25Z - KDS

mjbcswitzerland — Tue, 28 Jul 2015 15:29:20 GMT

Probaby the reason why the code doesn't work is because the GPIO is not being enabled/clocked.

Add

SIM_SCGC5 |= SIM_SCGC5_PORTB;

at the start of ledkonf().

[if there is a compilation error check the name of the register/bits in the header that you use and modfiy as required]

Regards

Mark

Kinetis: µTasker Kinetis support

KL25: µTasker Kinetis FRDM-KL25Z support / µTasker Kinetis TWR-KL25Z48M support

For the complete "out-of-the-box" Kinetis experience and faster time to market

Re: Blinking LED on KL25Z - KDS

EarlOrlando — Tue, 28 Jul 2015 15:54:08 GMT

Hello,

Please take a look into the thread below, specially the post marked as correct answer. It explains how to get a LED and a push button working in baremetal. The explanation is based in the FRDM-KL05Z but it works exactly the same way to the KL25Z.

Re: Port configuration

Best regards,

Earl.

Re: Blinking LED on KL25Z - KDS

fireflies_at_night — Tue, 27 Jun 2023 16:06:12 GMT

Also, just wanted to add to this post. Learning from this helpful link, I see that the three LEDs (blue, green and red) are all having common anode configuration. This means that (counter-intuitively) all the LED's must be driven high to switch off (using PSOR registers) and driven low to switch on (using PCOR registers).