timer16.c

/****************************************************************************
 *   $Id:: timer16.c 9190 2012-02-16 20:59:45Z nxp41306                     $
 *   Project: NXP LPC11Uxx 16-bit timer example
 *
 *   Description:
 *     This file contains 16-bit timer code example which include timer 
 *     initialization, timer interrupt handler, and related APIs for 
 *     timer setup.
*
****************************************************************************
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* products. This software is supplied "AS IS" without any warranties.
* NXP Semiconductors assumes no responsibility or liability for the
* use of the software, conveys no license or title under any patent,
* copyright, or mask work right to the product. NXP Semiconductors
* reserves the right to make changes in the software without
* notification. NXP Semiconductors also make no representation or
* warranty that such application will be suitable for the specified
* use without further testing or modification.

* Permission to use, copy, modify, and distribute this software and its 
* documentation is hereby granted, under NXP Semiconductors' 
* relevant copyright 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.

****************************************************************************/

#include "LPC11Uxx.h"
#include "timer16.h"
#include "nmi.h"

volatile uint32_t timer16_0_counter[2] = {0,0};
volatile uint32_t timer16_1_counter[2] = {0,0};
volatile uint32_t timer16_0_capture[2] = {0,0};
volatile uint32_t timer16_1_capture[2] = {0,0};
volatile uint32_t timer16_0_period = 0;
volatile uint32_t timer16_1_period = 0;

/*****************************************************************************
** Function name:        delayMs
**
** Descriptions:        Start the timer delay in milo seconds
**                        until elapsed
**
** parameters:            timer number, Delay value in milo second             
**                         
** Returned value:        None
** 
*****************************************************************************/
void delayMs(uint8_t timer_num, uint32_t delayInMs)
{
  if (timer_num == 0)
  {
    /*
    * setup timer #0 for delay
    */
    LPC_CT16B0->TCR = 0x02;        /* reset timer */
    LPC_CT16B0->PR  = 0x00;        /* set prescaler to zero */
    LPC_CT16B0->MR0 = delayInMs * (SystemCoreClock / 1000);
    LPC_CT16B0->IR  = 0xff;        /* reset all interrrupts */
    LPC_CT16B0->MCR = 0x04;        /* stop timer on match */
    LPC_CT16B0->TCR = 0x01;        /* start timer */
    /* wait until delay time has elapsed */
    while (LPC_CT16B0->TCR & 0x01);
  }
  else if (timer_num == 1)
  {
    /*
    * setup timer #1 for delay
    */
    LPC_CT16B1->TCR = 0x02;        /* reset timer */
    LPC_CT16B1->PR  = 0x00;        /* set prescaler to zero */
    LPC_CT16B1->MR0 = delayInMs * (SystemCoreClock / 1000);
    LPC_CT16B1->IR  = 0xff;        /* reset all interrrupts */
    LPC_CT16B1->MCR = 0x04;        /* stop timer on match */
    LPC_CT16B1->TCR = 0x01;        /* start timer */
    /* wait until delay time has elapsed */
    while (LPC_CT16B1->TCR & 0x01);
  }
  return;
}

/******************************************************************************
** Function name:        TIMER_0_IRQHandler
**
** Descriptions:        Timer/CounterX and CaptureX interrupt handler
**
** parameters:            None
** Returned value:        None
** 
******************************************************************************/
extern "C" void TIMER16_0_IRQHandler(void)
{
  if ( LPC_CT16B0->IR & (0x1<<0) )
  {
    LPC_CT16B0->IR = 0x1<<0;            /* clear interrupt flag */
    timer16_0_counter[0]++;
  }
  if ( LPC_CT16B0->IR & (0x1<<1) )
  {
    LPC_CT16B0->IR = 0x1<<1;            /* clear interrupt flag */
    timer16_0_counter[1]++;
  }
  if ( LPC_CT16B0->IR & (0x1<<4) )
  {
    LPC_CT16B0->IR = 0x1<<4;        /* clear interrupt flag */
    timer16_0_capture[0]++;
  }
  if ( LPC_CT16B0->IR & (0x1<<5) )
  {
    LPC_CT16B0->IR = 0x1<<5;        /* clear interrupt flag */
    timer16_0_capture[1]++;
  }
  return;
}

/******************************************************************************
** Function name:        TIMER_1_IRQHandler
**
** Descriptions:        Timer/CounterX and CaptureX interrupt handler
**
** parameters:            None
** Returned value:        None
** 
******************************************************************************/
extern "C" void TIMER16_1_IRQHandler(void)
{
  if ( LPC_CT16B1->IR & (0x1<<0) )
  {  
    LPC_CT16B1->IR = 0x1<<0;            /* clear interrupt flag */
    timer16_1_counter[0]++;
  }
  if ( LPC_CT16B1->IR & (0x1<<1) )
  {  
    LPC_CT16B1->IR = 0x1<<1;            /* clear interrupt flag */
    timer16_1_counter[1]++;
  }
  if ( LPC_CT16B1->IR & (0x1<<4) )
  {
    LPC_CT16B1->IR = 0x1<<4;        /* clear interrupt flag */
    timer16_1_capture[0]++;
  }
  if ( LPC_CT16B1->IR & (0x1<<5) )
  {
    LPC_CT16B1->IR = 0x1<<5;        /* clear interrupt flag */
    timer16_1_capture[1]++;
  }
  return;
}

/******************************************************************************
** Function name:        enable_timer
**
** Descriptions:        Enable timer
**
** parameters:            timer number: 0 or 1
** Returned value:        None
** 
******************************************************************************/
void enable_timer16(uint8_t timer_num)
{
  if ( timer_num == 0 )
  {
    LPC_CT16B0->TCR = 1;
  }
  else
  {
    LPC_CT16B1->TCR = 1;
  }
  return;
}

/******************************************************************************
** Function name:        disable_timer
**
** Descriptions:        Disable timer
**
** parameters:            timer number: 0 or 1
** Returned value:        None
** 
******************************************************************************/
void disable_timer16(uint8_t timer_num)
{
  if ( timer_num == 0 )
  {
    LPC_CT16B0->TCR = 0;
  }
  else
  {
    LPC_CT16B1->TCR = 0;
  }
  return;
}

/******************************************************************************
** Function name:        reset_timer
**
** Descriptions:        Reset timer
**
** parameters:            timer number: 0 or 1
** Returned value:        None
** 
******************************************************************************/
void reset_timer16(uint8_t timer_num)
{
  uint32_t regVal;

  if ( timer_num == 0 )
  {
    regVal = LPC_CT16B0->TCR;
    regVal |= 0x02;
    LPC_CT16B0->TCR = regVal;
  }
  else
  {
    regVal = LPC_CT16B1->TCR;
    regVal |= 0x02;
    LPC_CT16B1->TCR = regVal;
  }
  return;
}

/******************************************************************************
** Function name:        Set_timer_capture
**
** Descriptions:        set timer capture based on LOC number.
**
** parameters:            timer number and location number
** Returned value:        None
** 
******************************************************************************/
void set_timer16_capture(uint8_t timer_num, uint8_t location )
{
  if ( timer_num == 0 )
  {
    /*  Timer0_16 I/O config */
    if ( location == 0 )
    {
      LPC_IOCON->PIO1_16           &= ~0x07;
      LPC_IOCON->PIO1_16           |= 0x02;        /* Timer0_16 CAP0 */
//      LPC_IOCON->PIO1_17           &= ~0x07;
//      LPC_IOCON->PIO1_17           |= 0x01;        /* Timer0_16 CAP1 */
    }
    else if ( location == 1 )
    {
      LPC_IOCON->PIO0_2            &= ~0x07;
      LPC_IOCON->PIO0_2            |= 0x02;        /* Timer0_16 CAP0 */
    }
    else
    {
      while ( 1 );                /* Fatal location number error */
    }
  }
  else
  {
    /*  Timer1_16 I/O config */
    if ( location == 0 )
    {
      LPC_IOCON->PIO0_20           &= ~0x07;    /*  Timer1_16 I/O config */
      LPC_IOCON->PIO0_20           |= 0x01;        /* Timer1_16 CAP0 */
//      LPC_IOCON->PIO1_18           &= ~0x07;
//      LPC_IOCON->PIO1_18           |= 0x01;        /* Timer1_16 CAP1 */
    }
    else
    {
      while ( 1 );                /* Fatal location number error */
    }
  }    
  return;
}

/******************************************************************************
** Function name:        Set_timer_match
**
** Descriptions:        set timer match based on LOC number.
**
** parameters:            timer number, match enable, and location number 
** Returned value:        None
** 
******************************************************************************/
void set_timer16_match(uint8_t timer_num, uint8_t match_enable, uint8_t location)
{
  if ( timer_num == 0 )
  {
    if ( match_enable & 0x01 )
    {
      /*  Timer0_16 I/O config */
      if ( location == 0 )
      {
        LPC_IOCON->PIO0_8           &= ~0x07;    
        LPC_IOCON->PIO0_8           |= 0x02;        /* Timer0_16 MAT0 */
      }
      else if ( location == 1 )
      {
        LPC_IOCON->PIO1_13           &= ~0x07;
        LPC_IOCON->PIO1_13           |= 0x02;        /* Timer0_16 MAT0 */
      }
    }
    if ( match_enable & 0x02 )
    {
      /*  Timer0_16 I/O config */
      if ( location == 0 )
      {
        LPC_IOCON->PIO0_9           &= ~0x07;
        LPC_IOCON->PIO0_9           |= 0x02;        /* Timer0_16 MAT1 */
      }
      else if ( location == 1 )
      {
        LPC_IOCON->PIO1_14           &= ~0x07;
        LPC_IOCON->PIO1_14           |= 0x02;        /* Timer0_16 MAT1 */
      }
    }
    if ( match_enable & 0x04 )
    {
      /*  Timer0_16 I/O config */
      if ( location == 0 )
      {
#ifdef __SWD_DISABLED
        LPC_IOCON->SWCLK_PIO0_10    &= ~0x07;
        LPC_IOCON->SWCLK_PIO0_10    |= 0x03;        /* Timer0_16 MAT2 */
#endif    
      }
      else if ( location == 1 )
      {
        LPC_IOCON->PIO1_15           &= ~0x07;
        LPC_IOCON->PIO1_15           |= 0x02;        /* Timer0_16 MAT0 */
      }
    }
  }
  else if ( timer_num == 1 )
  {
    if ( match_enable & 0x01 )
    {
      /*  Timer1_16 I/O config */
      if ( location == 0 )
      {
        LPC_IOCON->PIO0_21           &= ~0x07;
        LPC_IOCON->PIO0_21           |= 0x01;        /* Timer1_16 MAT0 */
      }
    }
    if ( match_enable & 0x02 )
    {
      /*  Timer1_16 I/O config */
      if ( location == 0 )
      {
        LPC_IOCON->PIO0_22           &= ~0x07;
        LPC_IOCON->PIO0_22           |= 0x02;        /* Timer1_16 MAT1 */
      }
      else if ( location == 1 )
      {
        LPC_IOCON->PIO1_23           &= ~0x07;
        LPC_IOCON->PIO1_23           |= 0x01;        /* Timer1_16 MAT0 */
      }
    }
  }
  return;        
}

/******************************************************************************
** Function name:        init_timer
**
** Descriptions:        Initialize timer, set timer interval, reset timer,
**                        install timer interrupt handler
**
** parameters:            timer number and timer interval
** Returned value:        None
** 
******************************************************************************/
void init_timer16(uint8_t timer_num, uint32_t TimerInterval) 
{
  if ( timer_num == 0 )
  {
    /* Some of the I/O pins need to be clearfully planned if
    you use below module because JTAG and TIMER CAP/MAT pins are muxed. */
    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<7);

    LPC_CT16B0->MR0 = TimerInterval;
    LPC_CT16B0->MR1 = TimerInterval;
#if TIMER_MATCH
    timer16_0_counter[0] = 0;
    timer16_0_counter[1] = 0;
    set_timer16_match(timer_num, 0x07, 0);
    LPC_CT16B0->EMR &= ~(0xFF<<4);
    LPC_CT16B0->EMR |= ((0x3<<4)|(0x3<<6)|(0x3<<8));
#else
    timer16_0_capture[0] = 0;
    timer16_0_capture[1] = 0;
    set_timer16_capture(timer_num, 0);
    /* Capture 0 and 1 on rising edge, interrupt enable. */
    LPC_CT16B0->CCR = (0x5<<0)|(0x5<<3);
#endif
    LPC_CT16B0->MCR = (0x3<<0)|(0x3<<3);  /* Interrupt and Reset on MR0 and MR1 */
        
    /* Enable the TIMER0 Interrupt */
#if NMI_ENABLED
    NVIC_DisableIRQ(TIMER_16_0_IRQn);
    NMI_Init( TIMER_16_0_IRQn );
#else
    NVIC_EnableIRQ(TIMER_16_0_IRQn);
#endif
  }
  else if ( timer_num == 1 )
  {
    /* Some of the I/O pins need to be clearfully planned if
    you use below module because JTAG and TIMER CAP/MAT pins are muxed. */
    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8);
    LPC_CT16B1->MR0 = TimerInterval;
    LPC_CT16B1->MR1 = TimerInterval;
#if TIMER_MATCH
    timer16_1_counter[0] = 0;
    timer16_1_counter[1] = 0;
    set_timer16_match(timer_num, 0x07, 0);
    LPC_CT16B1->EMR &= ~(0xFF<<4);
    LPC_CT16B1->EMR |= ((0x3<<4)|(0x3<<6)|(0x3<<8));
#else
    timer16_1_capture[0] = 0;
    timer16_1_capture[1] = 0;
    set_timer16_capture(timer_num, 0);
    /* Capture 0 and 1 on rising edge, interrupt enable. */
    LPC_CT16B1->CCR = (0x5<<0)|(0x5<<3);
#endif
    LPC_CT16B1->MCR = (0x3<<0)|(0x3<<3);  /* Interrupt and Reset on MR0 and MR1 */

    /* Enable the TIMER1 Interrupt */
#if NMI_ENABLED
    NVIC_DisableIRQ(TIMER_16_1_IRQn);
    NMI_Init( TIMER_16_1_IRQn );
#else
    NVIC_EnableIRQ(TIMER_16_1_IRQn);
#endif
  }
  return;
}

/******************************************************************************
** Function name:        init_timer16PWM
**
** Descriptions:        Initialize timer as PWM
**
** parameters:            timer number, period and match enable:
**                        match_enable[0] = PWM for MAT0 
**                        match_enable[1] = PWM for MAT1
**                        match_enable[2] = PWM for MAT2
**            
** Returned value:    None
** 
******************************************************************************/
void init_timer16PWM(uint8_t timer_num, uint32_t period, uint8_t match_enable, uint8_t cap_enabled)
{    
  disable_timer16(timer_num);

  if (timer_num == 1)
  {
    /* Some of the I/O pins need to be clearfully planned if
    you use below module because JTAG and TIMER CAP/MAT pins are muxed. */
    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8);
        
    /* Setup the external match register */
    LPC_CT16B1->EMR = (1<<EMC3)|(1<<EMC2)|(1<<EMC1)|(2<<EMC0)|(1<<3)|(match_enable);
        
    /* Setup the outputs */
    /* If match0 is enabled, set the output */
    set_timer16_match(timer_num, match_enable, 0 );
        
    /* Enable the selected PWMs and enable Match3 */
    LPC_CT16B1->PWMC = (1<<3)|(match_enable);
        
    /* Setup the match registers */
    /* set the period value to a global variable */
    timer16_1_period     = period;
    LPC_CT16B1->MR3     = timer16_1_period;
    LPC_CT16B1->MR0    = timer16_1_period/2;
    LPC_CT16B1->MR1    = timer16_1_period/2;
    LPC_CT16B1->MR2    = timer16_1_period/2;
        
    /* Set match control register */
    LPC_CT16B1->MCR = 1<<10;// | 1<<9;                /* Reset on MR3 */
        
    if (cap_enabled)
    {
      /* Use location 0 for test. */
      set_timer16_capture( timer_num, 0 );
      LPC_CT16B1->IR = 0xF;                            /* clear interrupt flag */
            
      /* Set the capture control register */
      LPC_CT16B1->CCR = 7;
            
    }
    /* Enable the TIMER1 Interrupt */
    NVIC_EnableIRQ(TIMER_16_1_IRQn);
  }
  else
  {
    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<7);
        
    /* Setup the external match register */
    LPC_CT16B0->EMR = (1<<EMC3)|(1<<EMC2)|(1<<EMC1)|(1<<EMC0)|(1<<3)|(match_enable);
        
    /* Setup the outputs */
    /* If match0 is enabled, set the output */
    set_timer16_match(timer_num, match_enable, 0 );
            
    /* Enable the selected PWMs and enable Match3 */
    LPC_CT16B0->PWMC = (1<<3)|(match_enable);
        
    /* Setup the match registers */
    /* set the period value to a global variable */
    timer16_0_period = period;
    LPC_CT16B0->MR3 = timer16_0_period;
    LPC_CT16B0->MR0 = timer16_0_period/2;
    LPC_CT16B0->MR1 = timer16_0_period/2;
    LPC_CT16B0->MR2 = timer16_0_period/2;
        
    /* Set the match control register */
    LPC_CT16B0->MCR = 1<<10;                /* Reset on MR3 */
        
    /* Enable the TIMER1 Interrupt */
    NVIC_EnableIRQ(TIMER_16_0_IRQn);
  }
}

/******************************************************************************
** Function name:        pwm16_setMatch
**
** Descriptions:        Set the pwm16 match values
**
** parameters:            timer number, match numner and the value
**
** Returned value:        None
** 
******************************************************************************/
void setMatch_timer16PWM (uint8_t timer_num, uint8_t match_nr, uint32_t value)
{
  if (timer_num)
  {
    switch (match_nr)
    {
      case 0:
        LPC_CT16B1->MR0 = value;
      break;
      case 1: 
        LPC_CT16B1->MR1 = value;
      break;
      case 2:
        LPC_CT16B1->MR2 = value;
      break;
      case 3: 
        LPC_CT16B1->MR3 = value;
      break;
      default:
        break;
    }    
  }
  else 
  {
    switch (match_nr)
    {
      case 0:
        LPC_CT16B0->MR0 = value;
      break;
      case 1: 
        LPC_CT16B0->MR1 = value;
      break;
      case 2:
        LPC_CT16B0->MR2 = value;
      break;
      case 3: 
        LPC_CT16B0->MR3 = value;
      break;
      default:
      break;
    }    
  }
}

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