245 lines
7.3 KiB
C
245 lines
7.3 KiB
C
/*
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ChibiOS - Copyright (C) 2015 Fabio Utzig
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2016 Stephane D'Alu
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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 st_lld.c
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* @brief NRF51822 ST subsystem low level driver source.
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*
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* @addtogroup ST
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* @{
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*/
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#include "hal.h"
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#if (OSAL_ST_MODE != OSAL_ST_MODE_NONE) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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#if (OSAL_ST_RESOLUTION == 32)
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#define ST_OVERFLOW_VALUE 0xFFFFFFFF
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#elif (OSAL_ST_RESOLUTION == 24)
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#define ST_OVERFLOW_VALUE 0x00FFFFFF
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#elif (OSAL_ST_RESOLUTION == 16)
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#define ST_OVERFLOW_VALUE 0x0000FFFF
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#endif
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local types. */
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/*===========================================================================*/
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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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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if (OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC) || defined(__DOXYGEN__)
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#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_RTC)
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/**
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* @brief System Timer vector (RTC0)
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* @details This interrupt is used for system tick in periodic mode
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* if selected with NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_RTC
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(Vector6C) {
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OSAL_IRQ_PROLOGUE();
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NRF_RTC0->EVENTS_TICK = 0;
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osalSysLockFromISR();
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osalOsTimerHandlerI();
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osalSysUnlockFromISR();
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OSAL_IRQ_EPILOGUE();
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}
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#endif
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#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_TIMER)
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/**
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* @brief System Timer vector. (TIMER0)
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* @details This interrupt is used for system tick in periodic mode
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* if selected with NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_TIMER
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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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/* Clear timer compare event */
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if (NRF_TIMER0->EVENTS_COMPARE[0] != 0)
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NRF_TIMER0->EVENTS_COMPARE[0] = 0;
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osalSysLockFromISR();
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osalOsTimerHandlerI();
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osalSysUnlockFromISR();
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OSAL_IRQ_EPILOGUE();
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}
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#endif
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#endif /* OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC */
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#if (OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING) || defined(__DOXYGEN__)
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#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_RTC)
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/**
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* @brief System Timer vector (RTC0)
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* @details This interrupt is used for freerunning mode (tick-less)
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* if selected with NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_RTC
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(Vector6C) {
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OSAL_IRQ_PROLOGUE();
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NRF_RTC0->EVENTS_COMPARE[0] = 0;
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osalSysLockFromISR();
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osalOsTimerHandlerI();
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osalSysUnlockFromISR();
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OSAL_IRQ_EPILOGUE();
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}
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#endif
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#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_TIMER)
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/**
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* @brief System Timer vector. (TIMER0)
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* @details This interrupt is used for freerunning mode (tick-less)
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* if selected with NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_TIMER
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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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/* Clear timer compare event */
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if (NRF_TIMER0->EVENTS_COMPARE[0] != 0)
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NRF_TIMER0->EVENTS_COMPARE[0] = 0;
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osalSysLockFromISR();
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osalOsTimerHandlerI();
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osalSysUnlockFromISR();
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OSAL_IRQ_EPILOGUE();
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}
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#endif
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#endif
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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 ST driver initialization.
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*
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* @notapi
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*/
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void st_lld_init(void) {
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#if (OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING)
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#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_RTC)
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/* Using RTC with prescaler */
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NRF_RTC0->TASKS_STOP = 1;
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NRF_RTC0->PRESCALER = (NRF51_LFCLK_FREQUENCY / OSAL_ST_FREQUENCY) - 1;
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NRF_RTC0->EVTENCLR = RTC_EVTEN_COMPARE0_Msk;
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NRF_RTC0->EVENTS_COMPARE[0] = 0;
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/* Start timer */
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nvicEnableVector(RTC0_IRQn, 8);
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NRF_RTC0->TASKS_START = 1;
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#endif
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#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_TIMER)
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NRF_TIMER0->TASKS_CLEAR = 1;
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/*
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* Using 32-bit mode with prescaler 16 configures this
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* timer with a 1MHz clock.
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*/
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NRF_TIMER0->BITMODE = 3;
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NRF_TIMER0->PRESCALER = 4;
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/*
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* Configure timer 0 compare capture 1 to generate interrupt
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* for overflow according to ST_OVERFLOW_VALUE
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*/
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NRF_TIMER0->CC[0] = (1000000 / OSAL_ST_FREQUENCY) - 1;
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NRF_TIMER0->SHORTS = 1;
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NRF_TIMER0->INTENSET = 0x10000;
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/* Start timer */
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nvicEnableVector(TIMER0_IRQn, 8);
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NRF_TIMER0->TASKS_START = 1;
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#endif
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#endif /* OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING */
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#if OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC
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#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_RTC)
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/* Using RTC with prescaler */
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NRF_RTC0->TASKS_STOP = 1;
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NRF_RTC0->PRESCALER = (NRF51_LFCLK_FREQUENCY / OSAL_ST_FREQUENCY) - 1;
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NRF_RTC0->INTENSET = RTC_INTENSET_TICK_Msk;
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/* Start timer */
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nvicEnableVector(RTC0_IRQn, 8);
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NRF_RTC0->TASKS_START = 1;
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#endif
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#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_TIMER)
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NRF_TIMER0->TASKS_CLEAR = 1;
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/*
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* Using 32-bit mode with prescaler 16 configures this
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* timer with a 1MHz clock.
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*/
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NRF_TIMER0->BITMODE = 3;
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NRF_TIMER0->PRESCALER = 4;
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/*
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* Configure timer 0 compare capture 0 to generate interrupt
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* and clear timer value when event is generated.
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*/
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NRF_TIMER0->CC[0] = (1000000 / OSAL_ST_FREQUENCY) - 1;
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NRF_TIMER0->SHORTS = 1;
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NRF_TIMER0->INTENSET = 0x10000;
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/* Start timer */
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nvicEnableVector(TIMER0_IRQn, 8);
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NRF_TIMER0->TASKS_START = 1;
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#endif
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#endif
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}
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#endif /* OSAL_ST_MODE != OSAL_ST_MODE_NONE */
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/** @} */
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