/*********************************************************************//**
* @brief Initializes the pPwm peripheral corresponding to the specified
* parameters in the PWM_ConfigStruct.
* @param[in] pwmId The Id of the expected PWM component
*
*
* @param[in] PWMTimerCounterMode Timer or Counter mode, should be:
* - PWM_MODE_TIMER: Counter of PWM peripheral is in Timer mode
* - PWM_MODE_COUNTER: Counter of PWM peripheral is in Counter mode
* @param[in] PWM_ConfigStruct Pointer to structure (PWM_TIMERCFG_Type or
* PWM_COUNTERCFG_Type) which will be initialized.
* @return None
* Note: PWM_ConfigStruct pointer will be assigned to corresponding structure
* (PWM_TIMERCFG_Type or PWM_COUNTERCFG_Type) due to PWMTimerCounterMode.
**********************************************************************/
void PWM_Init(uint8_t pwmId, uint32_t PWMTimerCounterMode, void *PWM_ConfigStruct)
{
LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
PWM_TIMERCFG_Type *pTimeCfg;
PWM_COUNTERCFG_Type *pCounterCfg;
uint64_t clkdlycnt;
pTimeCfg = (PWM_TIMERCFG_Type *)PWM_ConfigStruct;
pCounterCfg = (PWM_COUNTERCFG_Type *)PWM_ConfigStruct;
if(pwmId == PWM_0)
{
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCPWM0, ENABLE);
}
else if(pwmId == PWM_1)
{
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCPWM1, ENABLE);
}
else
{
//Trap the error
while(1);
}
// Get peripheral clock of PWM1
clkdlycnt = CLKPWR_GetCLK(CLKPWR_CLKTYPE_PER);
// Clear all interrupts pending
pPwm->IR = 0xFF & PWM_IR_BITMASK;
pPwm->TCR = 0x00;
pPwm->CTCR = 0x00;
pPwm->MCR = 0x00;
pPwm->CCR = 0x00;
pPwm->PCR = 0x00;
pPwm->LER = 0x00;
if (PWMTimerCounterMode == PWM_MODE_TIMER)
{
/* Absolute prescale value */
if (pTimeCfg->PrescaleOption == PWM_TIMER_PRESCALE_TICKVAL)
{
pPwm->PR = pTimeCfg->PrescaleValue - 1;
}
/* uSecond prescale value */
else
{
clkdlycnt = (clkdlycnt * pTimeCfg->PrescaleValue) / 1000000;
pPwm->PR = ((uint32_t) clkdlycnt) - 1;
}
}
else if (PWMTimerCounterMode == PWM_MODE_COUNTER)
{
pPwm->CTCR |= (PWM_CTCR_MODE((uint32_t)pCounterCfg->CounterOption)) \
| (PWM_CTCR_SELECT_INPUT((uint32_t)pCounterCfg->CountInputSelect));
}
}
/*********************************************************************//**
* @brief Initializes the PWMx peripheral corresponding to the specified
* parameters in the PWM_ConfigStruct.
* @param[in] PWMx PWM peripheral, should be LPC_PWM1
* @param[in] PWMTimerCounterMode Timer or Counter mode, should be:
* - PWM_MODE_TIMER: Counter of PWM peripheral is in Timer mode
* - PWM_MODE_COUNTER: Counter of PWM peripheral is in Counter mode
* @param[in] PWM_ConfigStruct Pointer to structure (PWM_TIMERCFG_Type or
* PWM_COUNTERCFG_Type) which will be initialized.
* @return None
* Note: PWM_ConfigStruct pointer will be assigned to corresponding structure
* (PWM_TIMERCFG_Type or PWM_COUNTERCFG_Type) due to PWMTimerCounterMode.
**********************************************************************/
void PWM_Init(LPC_PWM_TypeDef *PWMx, uint32_t PWMTimerCounterMode, void *PWM_ConfigStruct)
{
PWM_TIMERCFG_Type *pTimeCfg;
PWM_COUNTERCFG_Type *pCounterCfg;
uint64_t clkdlycnt;
CHECK_PARAM(PARAM_PWMx(PWMx));
CHECK_PARAM(PARAM_PWM_TC_MODE(PWMTimerCounterMode));
pTimeCfg = (PWM_TIMERCFG_Type *)PWM_ConfigStruct;
pCounterCfg = (PWM_COUNTERCFG_Type *)PWM_ConfigStruct;
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCPWM1, ENABLE);
CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_PWM1, CLKPWR_PCLKSEL_CCLK_DIV_4);
// Get peripheral clock of PWM1
clkdlycnt = (uint64_t) CLKPWR_GetPCLK (CLKPWR_PCLKSEL_PWM1);
// Clear all interrupts pending
PWMx->IR = 0xFF & PWM_IR_BITMASK;
PWMx->TCR = 0x00;
PWMx->CTCR = 0x00;
PWMx->MCR = 0x00;
PWMx->CCR = 0x00;
PWMx->PCR = 0x00;
PWMx->LER = 0x00;
if (PWMTimerCounterMode == PWM_MODE_TIMER)
{
CHECK_PARAM(PARAM_PWM_TIMER_PRESCALE(pTimeCfg->PrescaleOption));
/* Absolute prescale value */
if (pTimeCfg->PrescaleOption == PWM_TIMER_PRESCALE_TICKVAL)
{
PWMx->PR = pTimeCfg->PrescaleValue - 1;
}
/* uSecond prescale value */
else
{
clkdlycnt = (clkdlycnt * pTimeCfg->PrescaleValue) / 1000000;
PWMx->PR = ((uint32_t) clkdlycnt) - 1;
}
}
else if (PWMTimerCounterMode == PWM_MODE_COUNTER)
{
CHECK_PARAM(PARAM_PWM_COUNTER_INPUTSEL(pCounterCfg->CountInputSelect));
CHECK_PARAM(PARAM_PWM_COUNTER_EDGE(pCounterCfg->CounterOption));
PWMx->CTCR |= (PWM_CTCR_MODE((uint32_t)pCounterCfg->CounterOption)) \
| (PWM_CTCR_SELECT_INPUT((uint32_t)pCounterCfg->CountInputSelect));
}
}
