circuitpython/ports/nrf/hal/hal_rtc.c

124 lines
3.3 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Glenn Ruben Bakke
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "mphalport.h"
#include "hal_rtc.h"
#include "hal_irq.h"
#ifdef HAL_RTC_MODULE_ENABLED
#define HAL_LFCLK_FREQ (32768UL)
#define HAL_RTC_FREQ (10UL)
#define HAL_RTC_COUNTER_PRESCALER ((HAL_LFCLK_FREQ/HAL_RTC_FREQ)-1)
static hal_rtc_app_callback m_callback;
static uint32_t m_period[sizeof(RTC_BASE_POINTERS) / sizeof(uint32_t)];
void hal_rtc_callback_set(hal_rtc_app_callback callback) {
m_callback = callback;
}
void hal_rtc_init(hal_rtc_conf_t const * p_rtc_conf) {
NRF_RTC_Type * p_rtc = RTC_BASE(p_rtc_conf->id);
// start LFCLK if not already started
if (NRF_CLOCK->LFCLKSTAT == 0) {
NRF_CLOCK->TASKS_LFCLKSTART = 1;
while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0);
NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
}
m_period[p_rtc_conf->id] = p_rtc_conf->period;
p_rtc->PRESCALER = HAL_RTC_COUNTER_PRESCALER;
hal_irq_priority(RTC_IRQ_NUM(p_rtc_conf->id), p_rtc_conf->irq_priority);
}
void hal_rtc_start(uint8_t id) {
NRF_RTC_Type * p_rtc = RTC_BASE(id);
uint32_t period = HAL_RTC_FREQ * m_period[id];
uint32_t counter = p_rtc->COUNTER;
p_rtc->CC[0] = counter + period;
p_rtc->EVTENSET = RTC_EVTEN_COMPARE0_Msk;
p_rtc->INTENSET = RTC_INTENSET_COMPARE0_Msk;
hal_irq_clear(RTC_IRQ_NUM(id));
hal_irq_enable(RTC_IRQ_NUM(id));
p_rtc->TASKS_START = 1;
}
void hal_rtc_stop(uint8_t id) {
NRF_RTC_Type * p_rtc = RTC_BASE(id);
p_rtc->EVTENCLR = RTC_EVTEN_COMPARE0_Msk;
p_rtc->INTENCLR = RTC_INTENSET_COMPARE0_Msk;
hal_irq_disable(RTC_IRQ_NUM(id));
p_rtc->TASKS_STOP = 1;
}
static void common_irq_handler(uint8_t id) {
NRF_RTC_Type * p_rtc = RTC_BASE(id);
// clear all events
p_rtc->EVENTS_COMPARE[0] = 0;
p_rtc->EVENTS_COMPARE[1] = 0;
p_rtc->EVENTS_COMPARE[2] = 0;
p_rtc->EVENTS_COMPARE[3] = 0;
p_rtc->EVENTS_TICK = 0;
p_rtc->EVENTS_OVRFLW = 0;
m_callback(id);
}
void RTC0_IRQHandler(void)
{
common_irq_handler(0);
}
void RTC1_IRQHandler(void)
{
common_irq_handler(1);
}
#if NRF52
void RTC2_IRQHandler(void)
{
common_irq_handler(2);
}
#endif // NRF52
#endif // HAL_RTC_MODULE_ENABLED