crashtest-r0ket/core/timer32/timer32.c

/**************************************************************************/
/*! 
    @file     timer32.c
    @author   K. Townsend (microBuilder.eu)
    @date     22 March 2010
    @version  0.10

    @section DESCRIPTION
	
    Generic code for 32-bit timers.  By default, the timers are configured
    to generate an interrupt once every 100 microseconds, incrementing a
    global variable once per tick.

    @warning  Please note that the ROM-based USB drivers on the LPC1343
              require the use of 32-bit Timer 1.  If you plan on using the
              ROM-based USB functionality, you should restrict your timer
              usage to 32-bit timer 0.              

    @section Example

    @code 
    #include "/core/cpu/cpu.h"
    #include "/core/timer32/timer32.h"
    ...
    cpuInit();

    // Initialise 32-bit timer 0 with 100uS ticks
    timer32Init(0, TIMER32_DEFAULTINTERVAL);

    // Enable timer 0
    timer32Enable(0);

    // Cause a blocking delay for 1 second (1000mS)
    timer32Delay(0, TIMER32_DELAY_1MS * 1000);
    @endcode
	
    @section LICENSE

    Software License Agreement (BSD License)

    Copyright (c) 2010, microBuilder SARL
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:
    1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
    3. Neither the name of the copyright holders nor the
    names of its contributors may be used to endorse or promote products
    derived from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**************************************************************************/

#include "timer32.h"

volatile uint32_t timer32_0_counter = 0;
volatile uint32_t timer32_1_counter = 0;

/**************************************************************************/
/*! 
    @brief      Causes a blocking delay for the specified number of
                timer ticks.  The duration of each 'tick' is determined by
                the 'timerInterval' property supplied to timer32Init.
            
    @param[in]  timerNum
                The 32-bit timer to user (0..1)
    @param[in]  delay
                The number of counter increments to wait
*/
/**************************************************************************/
void timer32Delay(uint8_t timerNum, uint32_t delay)
{
  uint32_t curTicks;

  if (timerNum == 0)
  {
    curTicks = timer32_0_counter;
    if (curTicks > 0xFFFFFFFF - delay)
    {
      // Rollover will occur during delay
      while (timer32_0_counter >= curTicks)
      {
        while (timer32_0_counter < (delay - (0xFFFFFFFF - curTicks)));
      }      
    }
    else
    {
      while ((timer32_0_counter - curTicks) < delay);
    }
  }

  else if (timerNum == 1)
  {
    curTicks = timer32_1_counter;
    if (curTicks > 0xFFFFFFFF - delay)
    {
      // Rollover will occur during delay
      while (timer32_1_counter >= curTicks)
      {
        while (timer32_1_counter < (delay - (0xFFFFFFFF - curTicks)));
      }      
    }
    else
    {
      while ((timer32_1_counter - curTicks) < delay);
    }
  }

  return;
}

/**************************************************************************/
/*! 
    @brief Interrupt handler for 32-bit timer 0
*/
/**************************************************************************/
void TIMER32_0_IRQHandler(void)
{  
  /* Clear the interrupt flag */
  TMR_TMR32B0IR = TMR_TMR32B0IR_MR0;

  /* If you wish to perform some action after each timer 'tick' (such as 
     incrementing a counter variable) you can do so here */
  timer32_0_counter++;

  return;
}

/**************************************************************************/
/*! 
	@brief Interrupt handler for 32-bit timer 1
*/
/**************************************************************************/
void TIMER32_1_IRQHandler(void)
{  
  /* Clear the interrupt flag */
  TMR_TMR32B1IR = TMR_TMR32B1IR_MR0;

  /* If you wish to perform some action after each timer 'tick' (such as 
     incrementing a counter variable) you can do so here */
  timer32_1_counter++;

  return;
}

/**************************************************************************/
/*! 
    @brief Enables the specified timer

    @param[in]  timerNum
                The 32-bit timer to enable (0..1)
*/
/**************************************************************************/
void timer32Enable(uint8_t timerNum)
{
  if ( timerNum == 0 )
  {
    TMR_TMR32B0TCR = TMR_TMR32B0TCR_COUNTERENABLE_ENABLED;
  }

  else if (timerNum == 1)
  {
    TMR_TMR32B1TCR = TMR_TMR32B1TCR_COUNTERENABLE_ENABLED;
  }

  return;
}

/**************************************************************************/
/*! 
    @brief Disables the specified timer

    @param[in]  timerNum
                The 32-bit timer to disable (0..1)
*/
/**************************************************************************/
void timer32Disable(uint8_t timerNum)
{
  if ( timerNum == 0 )
  {
    TMR_TMR32B0TCR = TMR_TMR32B0TCR_COUNTERENABLE_DISABLED;
  }

  else if (timerNum == 1)
  {
    TMR_TMR32B1TCR = TMR_TMR32B1TCR_COUNTERENABLE_DISABLED;
  }

  return;
}

/**************************************************************************/
/*! 
    @brief Resets the specified timer

    @param[in]  timerNum
                The 32-bit timer to reset (0..1)
*/
/**************************************************************************/
void timer32Reset(uint8_t timerNum)
{
  uint32_t regVal;

  if ( timerNum == 0 )
  {
    regVal = TMR_TMR32B0TCR;
    regVal |= TMR_TMR32B0TCR_COUNTERRESET_ENABLED;
    TMR_TMR32B0TCR = regVal;
  }

  else if (timerNum == 1)
  {
    regVal = TMR_TMR32B1TCR;
    regVal |= TMR_TMR32B1TCR_COUNTERRESET_ENABLED;
    TMR_TMR32B1TCR = regVal;
  }

  return;
}

/**************************************************************************/
/*! 
    @brief  Initialises the specified 32-bit timer, and configures the
            timer to raise an interrupt and reset on match on MR0.
    
    @param[in]  timerNum
                The 32-bit timer to initiliase (0..1)
    @param[in]  timerInterval
                The number of clock 'ticks' between resets (0..0xFFFFFFFF)

    @note   Care needs to be taken when configuring the timers since the
            pins are all multiplexed with other peripherals.  This code is
            provided as a starting point, but it will need to be adjusted
            according to your own situation and pin/peripheral requirements
*/
/**************************************************************************/
void timer32Init(uint8_t timerNum, uint32_t timerInterval)
{
  // If timerInterval is invalid, use the default value
  if (timerInterval < 1)
  {
    timerInterval = TIMER32_DEFAULTINTERVAL;
  }

  if ( timerNum == 0 )
  {
    /* Enable the clock for CT32B0 */
    SCB_SYSAHBCLKCTRL |= (SCB_SYSAHBCLKCTRL_CT32B0);

    /* The physical pins associated with CT32B0 are not enabled by
       default in order to avoid conflicts with other peripherals.  If
       you wish to use any of the pin-dependant functionality, simply
       uncomment the appropriate lines below.                             */

    /* Configure PIO1.5 as Timer0_32 CAP0 */
    // IOCON_PIO1_5 &= ~IOCON_PIO1_5_FUNC_MASK;
    // IOCON_PIO1_5 |= IOCON_PIO1_5_FUNC_CT32B0_CAP0;

    /* Configure PIO1.6 as Timer0_32 MAT0 */
    // IOCON_PIO1_6 &= ~IOCON_PIO1_6_FUNC_MASK;	
    // IOCON_PIO1_6 |= IOCON_PIO1_6_FUNC_CT32B0_MAT0;

    /* Configure PIO1.7 as Timer0_32 MAT1 */
    // IOCON_PIO1_7 &= ~IOCON_PIO1_7_FUNC_MASK;
    // IOCON_PIO1_7 |= IOCON_PIO1_7_FUNC_CT32B0_MAT1;

    /* Configure PIO0.1 as Timer0_32 MAT2 */
    // IOCON_PIO0_1 &= ~IOCON_PIO0_1_FUNC_MASK;
    // IOCON_PIO0_1 |= IOCON_PIO0_1_FUNC_CT32B0_MAT2;

    /* Configure PIO0.11 as Timer0_32 MAT3 */
    /* Note: This pint can not be used with JTAG/SWD */
    // IOCON_JTAG_TDI_PIO0_11 &= ~IOCON_JTAG_TDI_PIO0_11_FUNC_MASK;
    // IOCON_JTAG_TDI_PIO0_11 |= IOCON_JTAG_TDI_PIO0_11_FUNC_CT32B0_MAT3;

    timer32_0_counter = 0;
    TMR_TMR32B0MR0 = timerInterval;

    /* Configure match control register to raise an interrupt and reset on MR0 */
    TMR_TMR32B0MCR = (TMR_TMR32B0MCR_MR0_INT_ENABLED | TMR_TMR32B0MCR_MR0_RESET_ENABLED);

    /* Enable the TIMER0 interrupt */
    NVIC_EnableIRQ(TIMER_32_0_IRQn);
  }

  else if ( timerNum == 1 )
  {
    /* Enable the clock for CT32B1 */
    SCB_SYSAHBCLKCTRL |= (SCB_SYSAHBCLKCTRL_CT32B1);

    /* The physical pins associated with CT32B0 are not enabled by
       default in order to avoid conflicts with other peripherals.        */

    /* Configure PIO1.0 as Timer1_32 CAP0 */
    /* Note: This pint can not be used with JTAG/SWD */
    // IOCON_JTAG_TMS_PIO1_0 &= ~IOCON_JTAG_TMS_PIO1_0_FUNC_MASK;
    // IOCON_JTAG_TMS_PIO1_0 |= IOCON_JTAG_TMS_PIO1_0_FUNC_CT32B1_CAP0;

    /* Configure PIO1.1 as Timer1_32 MAT0 */
    /* Note: This pint can not be used with JTAG/SWD */
    // IOCON_JTAG_TDO_PIO1_1 &= ~IOCON_JTAG_TDO_PIO1_1_FUNC_MASK;	
    // IOCON_JTAG_TDO_PIO1_1 |= IOCON_JTAG_TDO_PIO1_1_FUNC_CT32B1_MAT0;

    /* Configure PIO1.2 as Timer1_32 MAT1 */
    /* Note: This pint can not be used with JTAG/SWD */
    // IOCON_JTAG_nTRST_PIO1_2 &= ~IOCON_JTAG_nTRST_PIO1_2_FUNC_MASK;
    // IOCON_JTAG_nTRST_PIO1_2 |= IOCON_JTAG_nTRST_PIO1_2_FUNC_CT32B1_MAT1;

    /* Configure PIO1.3 as Timer1_32 MAT2 */
    /* Note: This pint can not be used with JTAG/SWD */
    // IOCON_SWDIO_PIO1_3 &= ~IOCON_SWDIO_PIO1_3_FUNC_MASK;
    // IOCON_SWDIO_PIO1_3 |= IOCON_SWDIO_PIO1_3_FUNC_CT32B1_MAT2;

    /* Configure PIO1.4 as Timer1_32 MAT3 */
    // IOCON_PIO1_4 &= ~IOCON_PIO1_4_FUNC_MASK;
    // IOCON_PIO1_4 |= IOCON_PIO1_4_FUNC_CT32B1_MAT3;

    timer32_1_counter = 0;
    TMR_TMR32B1MR0 = timerInterval;

    /* Configure match control register to raise an interrupt and reset on MR0 */
    TMR_TMR32B1MCR = (TMR_TMR32B1MCR_MR0_INT_ENABLED | TMR_TMR32B1MCR_MR0_RESET_ENABLED);

    /* Enable the TIMER1 Interrupt */
    NVIC_EnableIRQ(TIMER_32_1_IRQn);
  }
  return;
}