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ChibiOS/os/hal/platforms/STM32/icu_lld.c

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file STM32/icu_lld.c
* @brief STM32 ICU subsystem low level driver header.
*
* @addtogroup ICU
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_ICU || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief ICUD1 driver identifier.
* @note The driver ICUD1 allocates the complex timer TIM1 when enabled.
*/
#if STM32_ICU_USE_TIM1 || defined(__DOXYGEN__)
ICUDriver ICUD1;
#endif
/**
* @brief ICUD2 driver identifier.
* @note The driver ICUD1 allocates the timer TIM2 when enabled.
*/
#if STM32_ICU_USE_TIM2 || defined(__DOXYGEN__)
ICUDriver ICUD2;
#endif
/**
* @brief ICUD3 driver identifier.
* @note The driver ICUD1 allocates the timer TIM3 when enabled.
*/
#if STM32_ICU_USE_TIM3 || defined(__DOXYGEN__)
ICUDriver ICUD3;
#endif
/**
* @brief ICUD4 driver identifier.
* @note The driver ICUD4 allocates the timer TIM4 when enabled.
*/
#if STM32_ICU_USE_TIM4 || defined(__DOXYGEN__)
ICUDriver ICUD4;
#endif
/**
* @brief ICUD5 driver identifier.
* @note The driver ICUD5 allocates the timer TIM5 when enabled.
*/
#if STM32_ICU_USE_TIM5 || defined(__DOXYGEN__)
ICUDriver ICUD5;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Shared IRQ handler.
*
* @param[in] icup pointer to the @p ICUDriver object
*/
static void icu_lld_serve_interrupt(ICUDriver *icup) {
uint16_t sr;
sr = icup->tim->SR & icup->tim->DIER;
icup->tim->SR = 0;
if ((sr & TIM_SR_CC1IF) != 0)
_icu_isr_invoke_period_cb(icup);
if ((sr & TIM_SR_CC2IF) != 0)
_icu_isr_invoke_width_cb(icup);
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if STM32_ICU_USE_TIM1
/**
* @brief TIM1 compare interrupt handler.
* @note It is assumed that the various sources are only activated if the
* associated callback pointer is not equal to @p NULL in order to not
* perform an extra check in a potentially critical interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(TIM1_CC_IRQHandler) {
CH_IRQ_PROLOGUE();
icu_lld_serve_interrupt(&ICUD1);
CH_IRQ_EPILOGUE();
}
#endif /* STM32_ICU_USE_TIM1 */
#if STM32_ICU_USE_TIM2
/**
* @brief TIM2 compare interrupt handler.
* @note It is assumed that the various sources are only activated if the
* associated callback pointer is not equal to @p NULL in order to not
* perform an extra check in a potentially critical interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(TIM2_IRQHandler) {
CH_IRQ_PROLOGUE();
icu_lld_serve_interrupt(&ICUD2);
CH_IRQ_EPILOGUE();
}
#endif /* STM32_ICU_USE_TIM2 */
#if STM32_ICU_USE_TIM3
/**
* @brief TIM3 compare interrupt handler.
* @note It is assumed that the various sources are only activated if the
* associated callback pointer is not equal to @p NULL in order to not
* perform an extra check in a potentially critical interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(TIM3_IRQHandler) {
CH_IRQ_PROLOGUE();
icu_lld_serve_interrupt(&ICUD3);
CH_IRQ_EPILOGUE();
}
#endif /* STM32_ICU_USE_TIM3 */
#if STM32_ICU_USE_TIM4
/**
* @brief TIM4 compare interrupt handler.
* @note It is assumed that the various sources are only activated if the
* associated callback pointer is not equal to @p NULL in order to not
* perform an extra check in a potentially critical interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(TIM4_IRQHandler) {
CH_IRQ_PROLOGUE();
icu_lld_serve_interrupt(&ICUD4);
CH_IRQ_EPILOGUE();
}
#endif /* STM32_ICU_USE_TIM4 */
#if STM32_ICU_USE_TIM5
/**
* @brief TIM5 compare interrupt handler.
* @note It is assumed that the various sources are only activated if the
* associated callback pointer is not equal to @p NULL in order to not
* perform an extra check in a potentially critical interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(TIM5_IRQHandler) {
CH_IRQ_PROLOGUE();
icu_lld_serve_interrupt(&ICUD5);
CH_IRQ_EPILOGUE();
}
#endif /* STM32_ICU_USE_TIM5 */
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level ICU driver initialization.
*
* @notapi
*/
void icu_lld_init(void) {
#if STM32_ICU_USE_TIM1
/* Driver initialization.*/
icuObjectInit(&ICUD1);
ICUD1.tim = TIM1;
#endif
#if STM32_ICU_USE_TIM2
/* Driver initialization.*/
icuObjectInit(&ICUD2);
ICUD2.tim = TIM2;
#endif
#if STM32_ICU_USE_TIM3
/* Driver initialization.*/
icuObjectInit(&ICUD3);
ICUD3.tim = TIM3;
#endif
#if STM32_ICU_USE_TIM4
/* Driver initialization.*/
icuObjectInit(&ICUD4);
ICUD4.tim = TIM4;
#endif
#if STM32_ICU_USE_TIM5
/* Driver initialization.*/
icuObjectInit(&ICUD5);
ICUD5.tim = TIM5;
#endif
}
/**
* @brief Configures and activates the ICU peripheral.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @notapi
*/
void icu_lld_start(ICUDriver *icup) {
uint32_t clock, psc;
if (icup->state == ICU_STOP) {
/* Clock activation and timer reset.*/
#if STM32_ICU_USE_TIM1
if (&ICUD1 == icup) {
RCC->APB2ENR |= RCC_APB2ENR_TIM1EN;
RCC->APB2RSTR = RCC_APB2RSTR_TIM1RST;
RCC->APB2RSTR = 0;
NVICEnableVector(TIM1_CC_IRQn,
CORTEX_PRIORITY_MASK(STM32_ICU_TIM1_IRQ_PRIORITY));
clock = STM32_TIMCLK2;
}
#endif
#if STM32_ICU_USE_TIM2
if (&ICUD2 == icup) {
RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
RCC->APB1RSTR = RCC_APB1RSTR_TIM2RST;
RCC->APB1RSTR = 0;
NVICEnableVector(TIM2_IRQn,
CORTEX_PRIORITY_MASK(STM32_ICU_TIM2_IRQ_PRIORITY));
clock = STM32_TIMCLK1;
}
#endif
#if STM32_ICU_USE_TIM3
if (&ICUD3 == icup) {
RCC->APB1ENR |= RCC_APB1ENR_TIM3EN;
RCC->APB1RSTR = RCC_APB1RSTR_TIM3RST;
RCC->APB1RSTR = 0;
NVICEnableVector(TIM3_IRQn,
CORTEX_PRIORITY_MASK(STM32_ICU_TIM3_IRQ_PRIORITY));
clock = STM32_TIMCLK1;
}
#endif
#if STM32_ICU_USE_TIM4
if (&ICUD4 == icup) {
RCC->APB1ENR |= RCC_APB1ENR_TIM4EN;
RCC->APB1RSTR = RCC_APB1RSTR_TIM4RST;
RCC->APB1RSTR = 0;
NVICEnableVector(TIM4_IRQn,
CORTEX_PRIORITY_MASK(STM32_ICU_TIM4_IRQ_PRIORITY));
clock = STM32_TIMCLK1;
}
#endif
#if STM32_ICU_USE_TIM5
if (&ICUD5 == icup) {
RCC->APB1ENR |= RCC_APB1ENR_TIM5EN;
RCC->APB1RSTR = RCC_APB1RSTR_TIM5RST;
RCC->APB1RSTR = 0;
NVICEnableVector(TIM5_IRQn,
CORTEX_PRIORITY_MASK(STM32_ICU_TIM5_IRQ_PRIORITY));
clock = STM32_TIMCLK1;
}
#endif
}
else {
/* Driver re-configuration scenario, it must be stopped first.*/
icup->tim->CR1 = 0; /* Timer disabled. */
icup->tim->DIER = 0; /* All IRQs disabled. */
icup->tim->SR = 0; /* Clear eventual pending IRQs. */
icup->tim->CCR1 = 0; /* Comparator 1 disabled. */
icup->tim->CCR2 = 0; /* Comparator 2 disabled. */
icup->tim->CNT = 0; /* Counter reset to zero. */
}
/* Timer configuration.*/
psc = (clock / icup->config->frequency) - 1;
chDbgAssert((psc <= 0xFFFF) &&
((psc + 1) * icup->config->frequency) == clock,
"icu_lld_start(), #1", "invalid frequency");
icup->tim->PSC = (uint16_t)psc;
icup->tim->ARR = 0xFFFF;
/* CCMR1_CC1S = 01 = CH1 Input on TI1.
CCMR1_CC2S = 10 = CH2 Input on TI2.*/
icup->tim->CCMR1 = TIM_CCMR1_CC1S_0 |
TIM_CCMR1_CC2S_1;
/* SMCR_TS = 101, input is TI1FP1.
SMCR_SMS = 100, reset on rising edge.*/
icup->tim->SMCR = TIM_SMCR_TS_2 | TIM_SMCR_TS_0 |
TIM_SMCR_SMS_2;
/* The CCER settings depend on the selected trigger mode.
ICU_INPUT_ACTIVE_HIGH: Active on rising edge, idle on falling edge.
ICU_INPUT_ACTIVE_LOW: Active on falling edge, idle on rising edge.*/
if (icup->config->mode == ICU_INPUT_ACTIVE_HIGH)
icup->tim->CCER = TIM_CCER_CC1E |
TIM_CCER_CC2E | TIM_CCER_CC2P;
else
icup->tim->CCER = TIM_CCER_CC1E | TIM_CCER_CC1P |
TIM_CCER_CC2E;
}
/**
* @brief Deactivates the ICU peripheral.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @notapi
*/
void icu_lld_stop(ICUDriver *icup) {
if (icup->state == ICU_READY) {
/* Clock deactivation.*/
icup->tim->CR1 = 0; /* Timer disabled. */
icup->tim->DIER = 0; /* All IRQs disabled. */
icup->tim->SR = 0; /* Clear eventual pending IRQs. */
#if STM32_ICU_USE_TIM1
if (&ICUD1 == icup) {
NVICDisableVector(TIM1_CC_IRQn);
RCC->APB2ENR &= ~RCC_APB2ENR_TIM1EN;
}
#endif
}
#if STM32_ICU_USE_TIM2
if (&ICUD2 == icup) {
NVICDisableVector(TIM2_IRQn);
RCC->APB1ENR &= ~RCC_APB1ENR_TIM2EN;
}
#endif
#if STM32_ICU_USE_TIM3
if (&ICUD3 == icup) {
NVICDisableVector(TIM3_IRQn);
RCC->APB1ENR &= ~RCC_APB1ENR_TIM3EN;
}
#endif
#if STM32_ICU_USE_TIM4
if (&ICUD4 == icup) {
NVICDisableVector(TIM4_IRQn);
RCC->APB1ENR &= ~RCC_APB1ENR_TIM4EN;
}
#endif
#if STM32_ICU_USE_TIM5
if (&ICUD5 == icup) {
NVICDisableVector(TIM5_IRQn);
RCC->APB1ENR &= ~RCC_APB1ENR_TIM5EN;
}
#endif
}
/**
* @brief Enables the input capture.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @notapi
*/
void icu_lld_enable(ICUDriver *icup) {
icup->tim->SR = 0; /* Clear pending IRQs (if any). */
if (icup->config->period_cb != NULL)
icup->tim->DIER |= TIM_DIER_CC1IE;
if (icup->config->width_cb != NULL)
icup->tim->DIER |= TIM_DIER_CC2IE;
icup->tim->CR1 = TIM_CR1_URS | TIM_CR1_CEN;
}
/**
* @brief Disables the input capture.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @notapi
*/
void icu_lld_disable(ICUDriver *icup) {
icup->tim->CR1 = 0; /* Initially stopped. */
icup->tim->SR = 0; /* Clear pending IRQs (if any). */
icup->tim->DIER = 0; /* Interrupts disabled. */
}
#endif /* HAL_USE_ICU */
/** @} */
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