lpc43xx_systick.c

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/*
 * @brief System Tick module functions for stand-alone configuration
 *
 * @note
 * Copyright(C) NXP Semiconductors, 2012
 * All rights reserved.
 *
 * @par
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * LPC products.  This software is supplied "AS IS" without any warranties of
 * any kind, and NXP Semiconductors and its licensor disclaim any and
 * all warranties, express or implied, including all implied warranties of
 * merchantability, fitness for a particular purpose and non-infringement of
 * intellectual property rights.  NXP Semiconductors assumes no responsibility
 * or liability for the use of the software, conveys no license or rights under any
 * patent, copyright, mask work right, or any other intellectual property rights in
 * or to any products. NXP Semiconductors reserves the right to make changes
 * in the software without notification. NXP Semiconductors also makes no
 * representation or warranty that such application will be suitable for the
 * specified use without further testing or modification.
 *
 * @par
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, under NXP Semiconductors' and its
 * licensor's relevant copyrights in the software, without fee, provided that it
 * is used in conjunction with NXP Semiconductors microcontrollers.  This
 * copyright, permission, and disclaimer notice must appear in all copies of
 * this code.
 */

 // FIXME - is this file needed? outside of norm.
#include "chip.h"
#include "board.h"

#include "GUI.h"

/*****************************************************************************
 * Private types/enumerations/variables
 ****************************************************************************/
/* Saved reference period */
static uint32_t saved_period;
static int16_t old_tmp_x = -1, old_tmp_y = -1;

/* Check every 20ms for TSC events */
#define TSC_CHECK_DELAY   (20)

#if (defined(CHIP_LPC43XX) && defined(CORE_M0))

#define RITIMER_IRQn_PRI  (255)

/* RITimer Reload value */
static uint32_t reload_val;
#endif

/*****************************************************************************
 * Public types/enumerations/variables
 ****************************************************************************/

/* Saved total time in mS since timer was enabled */
volatile uint32_t systick_timems;

extern volatile int tsc_init_done;

extern uint32_t SystemCoreClock;

/*****************************************************************************
 * Private functions
 ****************************************************************************/

/*****************************************************************************
 * Public functions
 ****************************************************************************/

#if (defined(CHIP_LPC43XX) && defined(CORE_M0))

void SysTick_Enable(uint32_t period)
{
 saved_period = period;

 /* Clear any pending interrupt */
 Chip_RIT_ClearInt(LPC_RITIMER);

 /* Calculate reload value */
 reload_val = ( SystemCoreClock / ( 1000 / period ) );
 Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Let it tick */

 /* Set the priority and enable the interrupt */
 NVIC_SetPriority((IRQn_Type) RITIMER_IRQn, RITIMER_IRQn_PRI);
 NVIC_EnableIRQ((IRQn_Type) RITIMER_IRQn);
}

void SysTick_Disable(void)
{
 Chip_RIT_Disable(LPC_RITIMER);
}

void RIT_IRQHandler(void)
{
 int16_t tmp_x = -1, tmp_y = -1;
 int16_t tmp_x1 = -1, tmp_y1 = -1;
 static uint8_t tsc_tick = 0;
 static uint8_t pressed = 0;
 bool touched;

 /* Clear RITimer Interrupt, Reload counter value */
 Chip_RIT_ClearInt(LPC_RITIMER);
 Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Reload value */

 /* Increment tick count */
 systick_timems += saved_period;

 /* If TSC enabled, store Touch event */
 if (tsc_init_done) {
  tsc_tick += saved_period;
  if (tsc_tick == TSC_CHECK_DELAY) {
   touched = Board_GetTouchPos((int16_t *) &tmp_x, (int16_t *) &tmp_y);
   if (touched == true) {
    if (pressed == 1) {
     if ((tmp_x >= 0) && (tmp_y > 0) && ((tmp_x != old_tmp_x) || (tmp_y != old_tmp_y))) {
      tmp_x1 = tmp_y;
      tmp_y1 = tmp_x;
      GUI_TOUCH_StoreState(320 - tmp_x1, tmp_y1);
      old_tmp_x = tmp_x;
      old_tmp_y = tmp_y;
     }
    }
    else {
     GUI_TOUCH_StoreState(320 - tmp_x1, tmp_y1);
     old_tmp_x = tmp_x;
     old_tmp_y = tmp_y;
     pressed = 1;
    }
   }
   else {
    if (pressed == 1) {
     GUI_TOUCH_StoreState(-1, -1);
     pressed = 0;
    }
   }
   tsc_tick = 0;
  }
 }
}

#else

void SysTick_Enable(uint32_t period)
{
 saved_period = period;
 SysTick_Config((SystemCoreClock * period) / 1000);
}

void SysTick_Disable(void)
{
 SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
}

void SysTick_Handler(void)
{
 int16_t tmp_x = -1, tmp_y = -1;
 int16_t tmp_x1 = -1, tmp_y1 = -1;
 static uint8_t tsc_tick = 0;
 static uint8_t pressed = 0;
 bool touched;

 /* Increment tick count */
 systick_timems += saved_period;

 /* If TSC enabled, store Touch event */
 if (tsc_init_done) {
  tsc_tick += saved_period;
  if (tsc_tick == TSC_CHECK_DELAY) {
   touched = Board_GetTouchPos((int16_t *) &tmp_x, (int16_t *) &tmp_y);
   if (touched == true) {
    if (pressed == 1) {
     if ((tmp_x >= 0) && (tmp_y > 0) && ((tmp_x != old_tmp_x) || (tmp_y != old_tmp_y))) {
      tmp_x1 = tmp_y;
      tmp_y1 = tmp_x;
      GUI_TOUCH_StoreState(320 - tmp_x1, tmp_y1);
      old_tmp_x = tmp_x;
      old_tmp_y = tmp_y;
     }
    }
    else {
     GUI_TOUCH_StoreState(320 - tmp_x1, tmp_y1);
     old_tmp_x = tmp_x;
     old_tmp_y = tmp_y;
     pressed = 1;
    }
   }
   else {
    if (pressed == 1) {
     GUI_TOUCH_StoreState(-1, -1);
     pressed = 0;
    }
   }
   tsc_tick = 0;
  }
 }
}

#endif

void msDelay(uint32_t ms)
{
 uint32_t to = ms + systick_timems;

 while (to > systick_timems) {}
}

uint32_t sys_now(void)
{
 return systick_timems;;
}

/* --------------------------------- End Of File ------------------------------ */