/*!
* brief Ungates the LPTMR clock and configures the peripheral for a basic operation.
*
* note This API should be called at the beginning of the application using the LPTMR driver.
*
* param base LPTMR peripheral base address
* param config A pointer to the LPTMR configuration structure.
*/
void LPTMR_Init(LPTMR_Type *base, const lptmr_config_t *config)
{
assert(config);
#if defined(LPTMR_CLOCKS)
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
uint32_t instance = LPTMR_GetInstance(base);
/* Ungate the LPTMR clock*/
CLOCK_EnableClock(s_lptmrClocks[instance]);
#if defined(LPTMR_PERIPH_CLOCKS)
CLOCK_EnableClock(s_lptmrPeriphClocks[instance]);
#endif
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
#endif /* LPTMR_CLOCKS */
/* Configure the timers operation mode and input pin setup */
base->CSR = (LPTMR_CSR_TMS(config->timerMode) | LPTMR_CSR_TFC(config->enableFreeRunning) |
LPTMR_CSR_TPP(config->pinPolarity) | LPTMR_CSR_TPS(config->pinSelect));
/* Configure the prescale value and clock source */
base->PSR = (LPTMR_PSR_PRESCALE(config->value) | LPTMR_PSR_PBYP(config->bypassPrescaler) |
LPTMR_PSR_PCS(config->prescalerClockSource));
}
/*FUNCTION**********************************************************************
*
* Function Name : LPTMR_HAL_SetTimerWorkingMode
* Description : Config the LPTMR working mode.
*
*END**************************************************************************/
void LPTMR_HAL_SetTimerWorkingMode(LPTMR_Type * base, lptmr_working_mode_user_config_t timerMode)
{
uint32_t csr;
csr = LPTMR_RD_CSR(base);
csr &= ~(LPTMR_CSR_TCF_MASK | LPTMR_CSR_TMS_MASK | LPTMR_CSR_TFC_MASK
| LPTMR_CSR_TPP_MASK | LPTMR_CSR_TPS_MASK);
csr |= LPTMR_CSR_TMS(timerMode.timerModeSelect)
| LPTMR_CSR_TFC(timerMode.freeRunningEnable)
| LPTMR_CSR_TPP(timerMode.pinPolarity)
| LPTMR_CSR_TPS(timerMode.pinSelect);
LPTMR_WR_CSR(base, csr);
}
void LPTMR_Init(LPTMR_Type *base, const lptmr_config_t *config)
{
assert(config);
/* Ungate the LPTMR clock*/
CLOCK_EnableClock(s_lptmrClocks[LPTMR_GetInstance(base)]);
/* Configure the timers operation mode and input pin setup */
base->CSR = (LPTMR_CSR_TMS(config->timerMode) | LPTMR_CSR_TFC(config->enableFreeRunning) |
LPTMR_CSR_TPP(config->pinPolarity) | LPTMR_CSR_TPS(config->pinSelect));
/* Configure the prescale value and clock source */
base->PSR = (LPTMR_PSR_PRESCALE(config->value) | LPTMR_PSR_PBYP(config->bypassPrescaler) |
LPTMR_PSR_PCS(config->prescalerClockSource));
}
int z_clock_driver_init(struct device *unused)
{
u32_t csr, psr, sircdiv; /* LPTMR registers */
ARG_UNUSED(unused);
IRQ_CONNECT(DT_OPENISA_RV32M1_LPTMR_SYSTEM_LPTMR_IRQ,
SYSTEM_TIMER_IRQ_PRIO, lptmr_irq_handler, NULL, 0);
if ((SCG->SIRCCSR & SCG_SIRCCSR_SIRCEN_MASK) == SCG_SIRCCSR_SIRCEN(0)) {
/*
* SIRC is on by default, so something else turned it off.
*
* This is incompatible with this driver, which is SIRC-based.
*/
return -ENODEV;
}
/* Disable the timer and clear any pending IRQ. */
csr = SYSTEM_TIMER_INSTANCE->CSR;
csr &= ~LPTMR_CSR_TEN(0);
csr |= LPTMR_CSR_TFC(1);
SYSTEM_TIMER_INSTANCE->CSR = csr;
/*
* Set up the timer clock source and configure the timer.
*/
/*
* SIRCDIV3 is the SIRC divider for LPTMR (SoC dependent).
* Pass it directly through without any divider.
*/
sircdiv = SCG->SIRCDIV;
sircdiv &= ~SCG_SIRCDIV_SIRCDIV3_MASK;
sircdiv |= SCG_SIRCDIV_SIRCDIV3(SIRCDIV3_DIVIDE_BY_1);
SCG->SIRCDIV = sircdiv;
/*
* TMS = 0: time counter mode, not pulse counter
* TCF = 0: reset counter register on reaching compare value
* TDRE = 0: disable DMA request
*/
csr &= ~(LPTMR_CSR_TMS(1) | LPTMR_CSR_TFC(1) | LPTMR_CSR_TDRE(1));
/*
* TIE = 1: enable interrupt
*/
csr |= LPTMR_CSR_TIE(1);
SYSTEM_TIMER_INSTANCE->CSR = csr;
/*
* PCS = 0: clock source is SIRCDIV3 (SoC dependent)
* PBYP = 1: bypass the prescaler
*/
psr = SYSTEM_TIMER_INSTANCE->PSR;
psr &= ~LPTMR_PSR_PCS_MASK;
psr |= (LPTMR_PSR_PBYP(1) | LPTMR_PSR_PCS(PCS_SOURCE_SIRCDIV3));
SYSTEM_TIMER_INSTANCE->PSR = psr;
/*
* Set compare register to the proper tick count. The check
* here makes sure SIRC is left at its default reset value to
* make the defconfig setting work properly.
*
* TODO: be smarter to meet arbitrary Kconfig settings.
*/
if ((SCG->SIRCCFG & SCG_SIRCCFG_RANGE_MASK) != SIRC_RANGE_8MHZ) {
return -EINVAL;
}
SYSTEM_TIMER_INSTANCE->CMR = CYCLES_PER_TICK;
/*
* Enable interrupts and the timer. There's no need to clear the
* TFC bit in the csr variable, as it's already clear.
*/
irq_enable(DT_OPENISA_RV32M1_LPTMR_SYSTEM_LPTMR_IRQ);
csr = SYSTEM_TIMER_INSTANCE->CSR;
csr |= LPTMR_CSR_TEN(1);
SYSTEM_TIMER_INSTANCE->CSR = csr;
return 0;
}