lpc17xx_rit.c

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/***********************************************************************/
/* Peripheral group ----------------------------------------------------------- */
/* Includes ------------------------------------------------------------------- */
#include "lpc17xx_rit.h"
#include "lpc17xx_clkpwr.h"

/* If this source file built with example, the LPC17xx FW library configuration
 * file in each example directory ("lpc17xx_libcfg.h") must be included,
 * otherwise the default FW library configuration file must be included instead
 */
#ifdef __BUILD_WITH_EXAMPLE__
#include "lpc17xx_libcfg.h"
#else
#include "lpc17xx_libcfg_default.h"
#endif /* __BUILD_WITH_EXAMPLE__ */

#ifdef _RIT

/* Public Functions ----------------------------------------------------------- */
/******************************************************************************//*
 * @brief       Initial for RIT
 *                  - Turn on power and clock
 *                  - Setup default register values
 * @param[in]   RITx is RIT peripheral selected, should be: LPC_RIT
 * @return      None
 *******************************************************************************/
void RIT_Init(LPC_RIT_TypeDef *RITx)
{
    CHECK_PARAM(PARAM_RITx(RITx));
    CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCRIT, ENABLE);
    //Set up default register values
    RITx->RICOMPVAL = 0xFFFFFFFF;
    RITx->RIMASK    = 0x00000000;
    RITx->RICTRL    = 0x0C;
    RITx->RICOUNTER = 0x00000000;
    // Turn on power and clock

}
/******************************************************************************//*
 * @brief       DeInitial for RIT
 *                  - Turn off power and clock
 *                  - ReSetup default register values
 * @param[in]   RITx is RIT peripheral selected, should be: LPC_RIT
 * @return      None
 *******************************************************************************/
void RIT_DeInit(LPC_RIT_TypeDef *RITx)
{
    CHECK_PARAM(PARAM_RITx(RITx));

    // Turn off power and clock
    CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCRIT, DISABLE);
    //ReSetup default register values
    RITx->RICOMPVAL = 0xFFFFFFFF;
    RITx->RIMASK    = 0x00000000;
    RITx->RICTRL    = 0x0C;
    RITx->RICOUNTER = 0x00000000;
}

/******************************************************************************//*
 * @brief       Set compare value, mask value and time counter value
 * @param[in]   RITx is RIT peripheral selected, should be: LPC_RIT
 * @param[in]   time_interval: timer interval value (ms)
 * @return      None
 *******************************************************************************/
void RIT_TimerConfig(LPC_RIT_TypeDef *RITx, uint32_t time_interval)
{
    uint32_t clock_rate, cmp_value;
    CHECK_PARAM(PARAM_RITx(RITx));

    // Get PCLK value of RIT
    clock_rate = CLKPWR_GetPCLK(CLKPWR_PCLKSEL_RIT);

    /* calculate compare value for RIT to generate interrupt at
     * specified time interval
     * COMPVAL = (RIT_PCLK * time_interval)/1000
     * (with time_interval unit is millisecond)
     */
    cmp_value = (clock_rate /1000) * time_interval;
    RITx->RICOMPVAL = cmp_value;

    /* Set timer enable clear bit to clear timer to 0 whenever
     * counter value equals the contents of RICOMPVAL
     */
    RITx->RICTRL |= (1<<1);
}


/******************************************************************************//*
 * @brief       Enable/Disable Timer
 * @param[in]   RITx is RIT peripheral selected, should be: LPC_RIT
 * @param[in]   NewState    New State of this function
 *                  -ENABLE: Enable Timer
 *                  -DISABLE: Disable Timer
 * @return      None
 *******************************************************************************/
void RIT_Cmd(LPC_RIT_TypeDef *RITx, FunctionalState NewState)
{
    CHECK_PARAM(PARAM_RITx(RITx));
    CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));

    //Enable or Disable Timer
    if(NewState==ENABLE)
    {
        RITx->RICTRL |= RIT_CTRL_TEN;
    }
    else
    {
        RITx->RICTRL &= ~RIT_CTRL_TEN;
    }
}

/******************************************************************************//*
 * @brief       Timer Enable/Disable on debug
 * @param[in]   RITx is RIT peripheral selected, should be: LPC_RIT
 * @param[in]   NewState    New State of this function
 *                  -ENABLE: The timer is halted whenever a hardware break condition occurs
 *                  -DISABLE: Hardware break has no effect on the timer operation
 * @return      None
 *******************************************************************************/
void RIT_TimerDebugCmd(LPC_RIT_TypeDef *RITx, FunctionalState NewState)
{
    CHECK_PARAM(PARAM_RITx(RITx));
    CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));

    //Timer Enable/Disable on break
    if(NewState==ENABLE)
    {
        RITx->RICTRL |= RIT_CTRL_ENBR;
    }
    else
    {
        RITx->RICTRL &= ~RIT_CTRL_ENBR;
    }
}
/******************************************************************************//*
 * @brief       Check whether interrupt flag is set or not
 * @param[in]   RITx is RIT peripheral selected, should be: LPC_RIT
 * @return      Current interrupt status, could be: SET/RESET
 *******************************************************************************/
IntStatus RIT_GetIntStatus(LPC_RIT_TypeDef *RITx)
{
    uint8_t result;
    CHECK_PARAM(PARAM_RITx(RITx));
    if((RITx->RICTRL&RIT_CTRL_INTEN)==1)    result= SET;
    else return RESET;
    //clear interrupt flag
    RITx->RICTRL |= RIT_CTRL_INTEN;
    return result;
}

#endif /* _RIT */

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