359 lines
9.4 KiB
C
359 lines
9.4 KiB
C
/*
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ChibiOS - 2015 Stephen Caudle
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file NRF51x22/gpt_lld.c
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* @brief NRF51x22 GPT subsystem low level driver source.
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*
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* @addtogroup GPT
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* @{
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*/
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#include "hal.h"
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#if HAL_USE_GPT || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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#define NRF5_TIMER_PRESCALER_NUM 10
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#define NRF5_TIMER_COMPARE_NUM 4
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief GPTD1 driver identifier.
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* @note The driver GPTD1 allocates the complex timer TIM1 when enabled.
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*/
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#if NRF5_GPT_USE_TIMER0 || defined(__DOXYGEN__)
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GPTDriver GPTD1;
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#endif
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/**
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* @brief GPTD2 driver identifier.
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* @note The driver GPTD2 allocates the timer TIM2 when enabled.
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*/
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#if NRF5_GPT_USE_TIMER1 || defined(__DOXYGEN__)
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GPTDriver GPTD2;
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#endif
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/**
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* @brief GPTD3 driver identifier.
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* @note The driver GPTD3 allocates the timer TIM3 when enabled.
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*/
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#if NRF5_GPT_USE_TIMER2 || defined(__DOXYGEN__)
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GPTDriver GPTD3;
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#endif
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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static uint8_t prescaler(uint16_t freq)
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{
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uint8_t i;
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static const gptfreq_t frequencies[] = {
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NRF5_GPT_FREQ_16MHZ,
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NRF5_GPT_FREQ_8MHZ,
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NRF5_GPT_FREQ_4MHZ,
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NRF5_GPT_FREQ_2MHZ,
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NRF5_GPT_FREQ_1MHZ,
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NRF5_GPT_FREQ_500KHZ,
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NRF5_GPT_FREQ_250KHZ,
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NRF5_GPT_FREQ_125KHZ,
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NRF5_GPT_FREQ_62500HZ,
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NRF5_GPT_FREQ_31250HZ,
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};
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for (i = 0; i < NRF5_TIMER_PRESCALER_NUM; i++)
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if (freq == frequencies[i])
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return i;
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osalDbgAssert(FALSE, "invalid timer frequency");
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return 0;
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}
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/**
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* @brief Shared IRQ handler.
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*
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* @param[in] gptp pointer to a @p GPTDriver object
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*/
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static void gpt_lld_serve_interrupt(GPTDriver *gptp) {
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gptp->tim->EVENTS_COMPARE[gptp->cc_int] = 0;
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if (gptp->state == GPT_ONESHOT)
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gptp->state = GPT_READY; /* Back in GPT_READY state. */
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gptp->config->callback(gptp);
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if NRF5_GPT_USE_TIMER0
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/**
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* @brief TIMER0 interrupt handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(Vector60) {
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OSAL_IRQ_PROLOGUE();
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gpt_lld_serve_interrupt(&GPTD1);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* NRF5_GPT_USE_TIMER0 */
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#if NRF5_GPT_USE_TIMER1
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/**
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* @brief TIMER1 interrupt handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(Vector64) {
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OSAL_IRQ_PROLOGUE();
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gpt_lld_serve_interrupt(&GPTD2);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* NRF5_GPT_USE_TIMER1 */
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#if NRF5_GPT_USE_TIMER2
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/**
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* @brief TIMER2 interrupt handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(Vector68) {
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OSAL_IRQ_PROLOGUE();
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gpt_lld_serve_interrupt(&GPTD3);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* NRF5_GPT_USE_TIMER2 */
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level GPT driver initialization.
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*
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* @notapi
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*/
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void gpt_lld_init(void) {
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#if NRF5_GPT_USE_TIMER0
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/* Driver initialization.*/
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GPTD1.tim = NRF_TIMER0;
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gptObjectInit(&GPTD1);
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#endif
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#if NRF5_GPT_USE_TIMER1
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/* Driver initialization.*/
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GPTD2.tim = NRF_TIMER1;
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gptObjectInit(&GPTD2);
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#endif
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#if NRF5_GPT_USE_TIMER2
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/* Driver initialization.*/
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GPTD3.tim = NRF_TIMER2;
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gptObjectInit(&GPTD3);
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#endif
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}
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/**
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* @brief Configures and activates the GPT peripheral.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @notapi
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*/
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void gpt_lld_start(GPTDriver *gptp) {
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NRF_TIMER_Type *tim = gptp->tim;
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if (gptp->state == GPT_STOP) {
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osalDbgAssert(gptp->cc_int < NRF5_TIMER_COMPARE_NUM,
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"invalid capture/compare index");
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tim->INTENSET = TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int;
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#if NRF5_GPT_USE_TIMER0
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if (&GPTD1 == gptp)
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nvicEnableVector(TIMER0_IRQn, NRF5_GPT_TIMER0_IRQ_PRIORITY);
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#endif
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#if NRF5_GPT_USE_TIMER1
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if (&GPTD2 == gptp)
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nvicEnableVector(TIMER1_IRQn, NRF5_GPT_TIMER1_IRQ_PRIORITY);
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#endif
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#if NRF5_GPT_USE_TIMER2
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if (&GPTD3 == gptp)
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nvicEnableVector(TIMER2_IRQn, NRF5_GPT_TIMER2_IRQ_PRIORITY);
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#endif
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}
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/* Prescaler value calculation.*/
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tim->PRESCALER = prescaler(gptp->config->frequency);
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/* Timer configuration.*/
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tim->MODE = TIMER_MODE_MODE_Timer << TIMER_MODE_MODE_Pos;
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switch (gptp->config->resolution) {
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case 8:
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tim->BITMODE = TIMER_BITMODE_BITMODE_08Bit << TIMER_BITMODE_BITMODE_Pos;
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break;
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case 16:
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tim->BITMODE = TIMER_BITMODE_BITMODE_16Bit << TIMER_BITMODE_BITMODE_Pos;
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break;
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#if NRF5_GPT_USE_TIMER0
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case 24:
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tim->BITMODE = TIMER_BITMODE_BITMODE_24Bit << TIMER_BITMODE_BITMODE_Pos;
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break;
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case 32:
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tim->BITMODE = TIMER_BITMODE_BITMODE_32Bit << TIMER_BITMODE_BITMODE_Pos;
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break;
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#endif
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default:
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osalDbgAssert(FALSE, "invalid timer resolution");
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break;
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};
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}
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/**
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* @brief Deactivates the GPT peripheral.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @notapi
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*/
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void gpt_lld_stop(GPTDriver *gptp) {
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if (gptp->state == GPT_READY) {
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gptp->tim->TASKS_SHUTDOWN = 1;
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#if NRF5_GPT_USE_TIMER0
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if (&GPTD1 == gptp)
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nvicDisableVector(TIMER0_IRQn);
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#endif
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#if NRF5_GPT_USE_TIMER1
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if (&GPTD2 == gptp)
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nvicDisableVector(TIMER1_IRQn);
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#endif
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#if NRF5_GPT_USE_TIMER2
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if (&GPTD3 == gptp)
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nvicDisableVector(TIMER2_IRQn);
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#endif
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gptp->tim->INTENCLR = TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int;
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}
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}
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/**
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* @brief Starts the timer in continuous mode.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval period in ticks
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*
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* @notapi
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*/
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void gpt_lld_start_timer(GPTDriver *gptp, gptcnt_t interval) {
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NRF_TIMER_Type *tim = gptp->tim;
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tim->TASKS_CLEAR = 1;
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tim->CC[gptp->cc_int] = (uint32_t)(interval - 1); /* Time constant. */
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if (gptp->state == GPT_ONESHOT)
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gptp->tim->SHORTS = TIMER_SHORTS_COMPARE0_STOP_Msk << gptp->cc_int;
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else if (gptp->state == GPT_CONTINUOUS)
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gptp->tim->SHORTS = TIMER_SHORTS_COMPARE0_CLEAR_Msk << gptp->cc_int;
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tim->TASKS_START = 1;
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}
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/**
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* @brief Stops the timer.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @notapi
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*/
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void gpt_lld_stop_timer(GPTDriver *gptp) {
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gptp->tim->TASKS_STOP = 1;
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}
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/**
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* @brief Starts the timer in one shot mode and waits for completion.
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* @details This function specifically polls the timer waiting for completion
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* in order to not have extra delays caused by interrupt servicing,
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* this function is only recommended for short delays.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval time interval in ticks
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*
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* @notapi
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*/
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void gpt_lld_polled_delay(GPTDriver *gptp, gptcnt_t interval) {
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NRF_TIMER_Type *tim = gptp->tim;
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tim->INTENCLR = (1UL << gptp->cc_int) << TIMER_INTENSET_COMPARE0_Pos;
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tim->TASKS_CLEAR = 1;
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tim->CC[gptp->cc_int] = (uint32_t)(interval - 1); /* Time constant. */
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tim->TASKS_START = 1;
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while (!(tim->INTENSET & (TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int)))
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;
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tim->INTENSET = TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int;
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}
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/**
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* @brief Returns the counter value of GPT peripheral.
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* @pre The GPT unit must be running in continuous mode.
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* @note The nature of the counter is not defined, it may count upward
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* or downward, it could be continuously running or not.
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*
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* @param[in] gptp pointer to a @p GPTDriver object
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* @return The current counter value.
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*
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* @notapi
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*/
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gptcnt_t gpt_lld_get_counter(GPTDriver *gptp) {
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gptp->tim->TASKS_CAPTURE[gptp->cc_get] = 1;
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return gptp->tim->CC[gptp->cc_get];
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}
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#endif /* HAL_USE_GPT */
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/** @} */
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