From 707b3a2f97ef9751e42bc377d68ff8479f3ef438 Mon Sep 17 00:00:00 2001 From: Stephane D'Alu Date: Fri, 8 Jul 2016 12:58:25 +0200 Subject: renamed port to NRF5 to make room for NRF52832 chip --- os/hal/ports/NRF5/NRF51822/hal_gpt_lld.c | 358 +++++++++++++++++++++++++++++++ 1 file changed, 358 insertions(+) create mode 100644 os/hal/ports/NRF5/NRF51822/hal_gpt_lld.c (limited to 'os/hal/ports/NRF5/NRF51822/hal_gpt_lld.c') diff --git a/os/hal/ports/NRF5/NRF51822/hal_gpt_lld.c b/os/hal/ports/NRF5/NRF51822/hal_gpt_lld.c new file mode 100644 index 0000000..f39470f --- /dev/null +++ b/os/hal/ports/NRF5/NRF51822/hal_gpt_lld.c @@ -0,0 +1,358 @@ +/* + ChibiOS - 2015 Stephen Caudle + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +*/ + +/** + * @file NRF51x22/gpt_lld.c + * @brief NRF51x22 GPT subsystem low level driver source. + * + * @addtogroup GPT + * @{ + */ + +#include "hal.h" + +#if HAL_USE_GPT || defined(__DOXYGEN__) + +/*===========================================================================*/ +/* Driver local definitions. */ +/*===========================================================================*/ + +#define NRF51_TIMER_PRESCALER_NUM 10 +#define NRF51_TIMER_COMPARE_NUM 4 + +/*===========================================================================*/ +/* Driver exported variables. */ +/*===========================================================================*/ + +/** + * @brief GPTD1 driver identifier. + * @note The driver GPTD1 allocates the complex timer TIM1 when enabled. + */ +#if NRF51_GPT_USE_TIMER0 || defined(__DOXYGEN__) +GPTDriver GPTD1; +#endif + +/** + * @brief GPTD2 driver identifier. + * @note The driver GPTD2 allocates the timer TIM2 when enabled. + */ +#if NRF51_GPT_USE_TIMER1 || defined(__DOXYGEN__) +GPTDriver GPTD2; +#endif + +/** + * @brief GPTD3 driver identifier. + * @note The driver GPTD3 allocates the timer TIM3 when enabled. + */ +#if NRF51_GPT_USE_TIMER2 || defined(__DOXYGEN__) +GPTDriver GPTD3; +#endif + +/*===========================================================================*/ +/* Driver local variables and types. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver local functions. */ +/*===========================================================================*/ + +static uint8_t prescaler(uint16_t freq) +{ + uint8_t i; + static const gptfreq_t frequencies[] = { + NRF51_GPT_FREQ_16MHZ, + NRF51_GPT_FREQ_8MHZ, + NRF51_GPT_FREQ_4MHZ, + NRF51_GPT_FREQ_2MHZ, + NRF51_GPT_FREQ_1MHZ, + NRF51_GPT_FREQ_500KHZ, + NRF51_GPT_FREQ_250KHZ, + NRF51_GPT_FREQ_125KHZ, + NRF51_GPT_FREQ_62500HZ, + NRF51_GPT_FREQ_31250HZ, + }; + + for (i = 0; i < NRF51_TIMER_PRESCALER_NUM; i++) + if (freq == frequencies[i]) + return i; + + osalDbgAssert(FALSE, "invalid timer frequency"); + + return 0; +} + +/** + * @brief Shared IRQ handler. + * + * @param[in] gptp pointer to a @p GPTDriver object + */ +static void gpt_lld_serve_interrupt(GPTDriver *gptp) { + + gptp->tim->EVENTS_COMPARE[gptp->cc_int] = 0; + if (gptp->state == GPT_ONESHOT) + gptp->state = GPT_READY; /* Back in GPT_READY state. */ + gptp->config->callback(gptp); +} + +/*===========================================================================*/ +/* Driver interrupt handlers. */ +/*===========================================================================*/ + +#if NRF51_GPT_USE_TIMER0 +/** + * @brief TIMER0 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(Vector60) { + + OSAL_IRQ_PROLOGUE(); + + gpt_lld_serve_interrupt(&GPTD1); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* NRF51_GPT_USE_TIMER0 */ + +#if NRF51_GPT_USE_TIMER1 +/** + * @brief TIMER1 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(Vector64) { + + OSAL_IRQ_PROLOGUE(); + + gpt_lld_serve_interrupt(&GPTD2); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* NRF51_GPT_USE_TIMER1 */ + +#if NRF51_GPT_USE_TIMER2 +/** + * @brief TIMER2 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(Vector68) { + + OSAL_IRQ_PROLOGUE(); + + gpt_lld_serve_interrupt(&GPTD3); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* NRF51_GPT_USE_TIMER2 */ + +/*===========================================================================*/ +/* Driver exported functions. */ +/*===========================================================================*/ + +/** + * @brief Low level GPT driver initialization. + * + * @notapi + */ +void gpt_lld_init(void) { + +#if NRF51_GPT_USE_TIMER0 + /* Driver initialization.*/ + GPTD1.tim = NRF_TIMER0; + gptObjectInit(&GPTD1); +#endif + +#if NRF51_GPT_USE_TIMER1 + /* Driver initialization.*/ + GPTD2.tim = NRF_TIMER1; + gptObjectInit(&GPTD2); +#endif + +#if NRF51_GPT_USE_TIMER2 + /* Driver initialization.*/ + GPTD3.tim = NRF_TIMER2; + gptObjectInit(&GPTD3); +#endif +} + +/** + * @brief Configures and activates the GPT peripheral. + * + * @param[in] gptp pointer to the @p GPTDriver object + * + * @notapi + */ +void gpt_lld_start(GPTDriver *gptp) { + + NRF_TIMER_Type *tim = gptp->tim; + + if (gptp->state == GPT_STOP) { + osalDbgAssert(gptp->cc_int < NRF51_TIMER_COMPARE_NUM, + "invalid capture/compare index"); + + tim->INTENSET = TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int; +#if NRF51_GPT_USE_TIMER0 + if (&GPTD1 == gptp) + nvicEnableVector(TIMER0_IRQn, NRF51_GPT_TIMER0_IRQ_PRIORITY); +#endif +#if NRF51_GPT_USE_TIMER1 + if (&GPTD2 == gptp) + nvicEnableVector(TIMER1_IRQn, NRF51_GPT_TIMER1_IRQ_PRIORITY); +#endif +#if NRF51_GPT_USE_TIMER2 + if (&GPTD3 == gptp) + nvicEnableVector(TIMER2_IRQn, NRF51_GPT_TIMER2_IRQ_PRIORITY); +#endif + } + + /* Prescaler value calculation.*/ + tim->PRESCALER = prescaler(gptp->config->frequency); + + /* Timer configuration.*/ + tim->MODE = TIMER_MODE_MODE_Timer << TIMER_MODE_MODE_Pos; + + switch (gptp->config->resolution) { + + case 8: + tim->BITMODE = TIMER_BITMODE_BITMODE_08Bit << TIMER_BITMODE_BITMODE_Pos; + break; + + case 16: + tim->BITMODE = TIMER_BITMODE_BITMODE_16Bit << TIMER_BITMODE_BITMODE_Pos; + break; + +#if NRF51_GPT_USE_TIMER0 + case 24: + tim->BITMODE = TIMER_BITMODE_BITMODE_24Bit << TIMER_BITMODE_BITMODE_Pos; + break; + + case 32: + tim->BITMODE = TIMER_BITMODE_BITMODE_32Bit << TIMER_BITMODE_BITMODE_Pos; + break; +#endif + + default: + osalDbgAssert(FALSE, "invalid timer resolution"); + break; + }; +} + +/** + * @brief Deactivates the GPT peripheral. + * + * @param[in] gptp pointer to the @p GPTDriver object + * + * @notapi + */ +void gpt_lld_stop(GPTDriver *gptp) { + + if (gptp->state == GPT_READY) { + gptp->tim->TASKS_SHUTDOWN = 1; + +#if NRF51_GPT_USE_TIMER0 + if (&GPTD1 == gptp) + nvicDisableVector(TIMER0_IRQn); +#endif +#if NRF51_GPT_USE_TIMER1 + if (&GPTD2 == gptp) + nvicDisableVector(TIMER1_IRQn); +#endif +#if NRF51_GPT_USE_TIMER2 + if (&GPTD3 == gptp) + nvicDisableVector(TIMER2_IRQn); +#endif + gptp->tim->INTENCLR = TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int; + } +} + +/** + * @brief Starts the timer in continuous mode. + * + * @param[in] gptp pointer to the @p GPTDriver object + * @param[in] interval period in ticks + * + * @notapi + */ +void gpt_lld_start_timer(GPTDriver *gptp, gptcnt_t interval) { + + NRF_TIMER_Type *tim = gptp->tim; + + tim->TASKS_CLEAR = 1; + tim->CC[gptp->cc_int] = (uint32_t)(interval - 1); /* Time constant. */ + if (gptp->state == GPT_ONESHOT) + gptp->tim->SHORTS = TIMER_SHORTS_COMPARE0_STOP_Msk << gptp->cc_int; + else if (gptp->state == GPT_CONTINUOUS) + gptp->tim->SHORTS = TIMER_SHORTS_COMPARE0_CLEAR_Msk << gptp->cc_int; + tim->TASKS_START = 1; +} + +/** + * @brief Stops the timer. + * + * @param[in] gptp pointer to the @p GPTDriver object + * + * @notapi + */ +void gpt_lld_stop_timer(GPTDriver *gptp) { + + gptp->tim->TASKS_STOP = 1; +} + +/** + * @brief Starts the timer in one shot mode and waits for completion. + * @details This function specifically polls the timer waiting for completion + * in order to not have extra delays caused by interrupt servicing, + * this function is only recommended for short delays. + * + * @param[in] gptp pointer to the @p GPTDriver object + * @param[in] interval time interval in ticks + * + * @notapi + */ +void gpt_lld_polled_delay(GPTDriver *gptp, gptcnt_t interval) { + + NRF_TIMER_Type *tim = gptp->tim; + + tim->INTENCLR = (1UL << gptp->cc_int) << TIMER_INTENSET_COMPARE0_Pos; + tim->TASKS_CLEAR = 1; + tim->CC[gptp->cc_int] = (uint32_t)(interval - 1); /* Time constant. */ + tim->TASKS_START = 1; + while (!(tim->INTENSET & (TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int))) + ; + tim->INTENSET = TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int; +} + +/** + * @brief Returns the counter value of GPT peripheral. + * @pre The GPT unit must be running in continuous mode. + * @note The nature of the counter is not defined, it may count upward + * or downward, it could be continuously running or not. + * + * @param[in] gptp pointer to a @p GPTDriver object + * @return The current counter value. + * + * @notapi + */ +gptcnt_t gpt_lld_get_counter(GPTDriver *gptp) { + + gptp->tim->TASKS_CAPTURE[gptp->cc_get] = 1; + return gptp->tim->CC[gptp->cc_get]; +} + +#endif /* HAL_USE_GPT */ + +/** @} */ -- cgit v1.2.3