util.c

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/***************************************************************************/
#include "thunderboard/board.h"
#include "thunderboard/util.h"
#include "em_cmu.h"
#include "em_emu.h"
#include "em_gpio.h"

/***************************************************************************/
/***************************************************************************/
/* Local variables */
volatile uint32_t msTickCount;       
/***************************************************************************/
/***************************************************************************/
uint32_t UTIL_init( void )
{

   uint32_t stat;
   uint32_t ticks;

   /* Setup SysTick Timer for 1 msec interrupts  */
   ticks = CMU_ClockFreqGet( cmuClock_CORE ) / 1000;
   stat = SysTick_Config( ticks );

   return stat;

}

/***************************************************************************/
void SysTick_Handler( void )
{

   msTickCount++;

   return;

}

/***************************************************************************/
void UTIL_delay( uint32_t ms )
{

   uint32_t curTicks;

   curTicks = msTickCount;
   while( ( msTickCount - curTicks ) < ms ) {
      EMU_EnterEM1();
   }

   return;

}

/***************************************************************************/
void UTIL_shutdown( void )
{

   EMU_EM4Init_TypeDef em4Init = EMU_EM4INIT_DEFAULT;

   em4Init.pinRetentionMode = emuPinRetentionEm4Exit;
   EMU_EM4Init( &em4Init );

   /* Set up for EM4 wakeup from gpio PD14 (EM4WU4). Need to enable glitch filter */
   GPIO_PinModeSet( BOARD_BUTTON_PORT, BOARD_BUTTON_LEFT_PIN, gpioModeInputPullFilter, 1 );
   GPIO_EM4EnablePinWakeup( ( 0x10 << _GPIO_EM4WUEN_EM4WUEN_SHIFT ), 0 );

   EMU_EnterEM4();

   return;

}