86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
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/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include <stdbool.h>
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#include "nrf.h"
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#include "boards/board.h"
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volatile uint32_t ticks_ms = 0;
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#define HAL_LFCLK_FREQ (32768UL)
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#define HAL_RTC_FREQ (1024UL)
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#define HAL_RTC_COUNTER_PRESCALER ((HAL_LFCLK_FREQ/HAL_RTC_FREQ)-1)
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/* Maximum RTC ticks */
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#define portNRF_RTC_MAXTICKS ((1U<<24)-1U)
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void board_init(void)
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{
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// 32Khz XTAL
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NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
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NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
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// Set up RTC1 as tick timer
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NVIC_DisableIRQ(RTC1_IRQn);
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NRF_RTC1->EVTENCLR = RTC_EVTEN_COMPARE0_Msk;
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NRF_RTC1->INTENCLR = RTC_INTENSET_COMPARE0_Msk;
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NRF_RTC1->TASKS_STOP = 1;
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NRF_RTC1->TASKS_CLEAR = 1;
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ticks_ms = 0;
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NRF_RTC1->PRESCALER = HAL_RTC_COUNTER_PRESCALER;
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NRF_RTC1->INTENSET = RTC_INTENSET_TICK_Msk;
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NRF_RTC1->TASKS_START = 1;
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NRF_RTC1->EVTENSET = RTC_EVTEN_OVRFLW_Msk;
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NVIC_SetPriority(RTC1_IRQn, 0xf); // lowest priority
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NVIC_EnableIRQ(RTC1_IRQn);
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}
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void RTC1_IRQHandler(void)
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{
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// Clear event
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NRF_RTC1->EVENTS_TICK = 0;
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volatile uint32_t dummy = NRF_RTC1->EVENTS_TICK;
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(void) dummy;
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//
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//// Tick correction
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uint32_t systick_counter = NRF_RTC1->COUNTER;
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uint32_t diff = (systick_counter - ticks_ms) & portNRF_RTC_MAXTICKS;
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ticks_ms += diff;
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}
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bool board_requests_safe_mode(void) {
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return false;
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}
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void reset_board(void) {
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}
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