GPIO commands for Blinking LED problem in simplisity studio

[yefj]

Hello, i have the following commands
GPIO_PinOutClear(LED_PORT_E,15)
GPIO_PinModeSet(LED_PORT_A,15,gpioModePushPull,0)
GPIO_PinOutSet(LED_PORT_E,15)

I know that i should put ON value delay OFF value in a loop in order to make the LEDs blink constantly.
I have tried to implement it ,but its not working.
Where did i go wrong?
Thanks.

#include <stdint.h>
#include <stdbool.h>
#include "em_device.h"
#include "em_chip.h"
#include "em_cmu.h"
#include "em_emu.h"
#include "bsp.h"
#include "bsp_trace.h"

#define LED_PORT_E    gpioPortE
#define LED_PIN_E     15

#define LED_PORT_A    gpioPortA
#define LED_PIN_A     15

volatile uint32_t msTicks; /* counts 1ms timeTicks */

void Delay(uint32_t dlyTicks);

/***************************************************************************//**
 * @brief SysTick_Handler
 * Interrupt Service Routine for system tick counter
 ******************************************************************************/
void SysTick_Handler(void)
{
  msTicks++;       /* increment counter necessary in Delay()*/
}

/***************************************************************************//**
 * @brief Delays number of msTick Systicks (typically 1 ms)
 * @param dlyTicks Number of ticks to delay
 ******************************************************************************/
void Delay(uint32_t dlyTicks)
{
  uint32_t curTicks;

  curTicks = msTicks;
  while ((msTicks - curTicks) < dlyTicks) ;
}

/***************************************************************************//**
 * @brief  Main function
 ******************************************************************************/
int main(void)
{
  /* Chip errata */
  CHIP_Init();
CMU_ClockEnable(cmuClock_GPIO,true);
  /* If first word of user data page is non-zero, enable Energy Profiler trace */
  BSP_TraceProfilerSetup();

  /* Setup SysTick Timer for 1 msec interrupts  */
  if (SysTick_Config(CMU_ClockFreqGet(cmuClock_CORE) / 1000)) {
    while (1) ;
  }

  /* Initialize LED driver */

  BSP_LedsInit();
  BSP_LedSet(0);
  GPIO_PinModeSet(LED_PORT_A,15,gpioModePushPull,0);
  Delay(1000);
  GPIO_PinModeSet(LED_PORT_E,15,gpioModePushPull,0);

  while (1) {
      GPIO_PinOutClear(LED_PORT_E,15);

      GPIO_PinOutSet(LED_PORT_E,15);


  }
}

 

[betwixt]

I have no experience with Simplisity Studio but looking at the code as generic 'C', I would have thought something to identify "SysTick_Handler" as an interrupt routine would be needed.

Brian.

 

[wwfeldman]

i am not familiar with Simplicity Studio either, but a generic C comment:

your code:
/* Setup SysTick Timer for 1 msec interrupts */
if (SysTick_Config(CMU_ClockFreqGet(cmuClock_CORE) / 1000)) {
while (1) ;
}

i would have expected something to happen for the while(1)
as it is, the if statement, when true, executes a while(1), which
doesn't do anything

likewise:
while (1) {
GPIO_PinOutClear(LED_PORT_E,15);

GPIO_PinOutSet(LED_PORT_E,15);
}

you set and clear the pin, which presumably drives the LED
but it will execute at the clock speed and i doubt you will see anything
like you said at the beginning of the first post, you need clear, delay, set, delay