85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* Copyright (c) 2015 Eric Holland
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*
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* Use of this source code is governed by a MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT
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*/
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#include <lk/err.h>
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#include <lk/debug.h>
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#include <lk/trace.h>
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#include <arch/arm/cm.h>
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#include <platform.h>
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#include <platform/nrf51.h>
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#include <platform/system_nrf51.h>
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#include <platform/timer.h>
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#include <sys/types.h>
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static volatile uint64_t current_ticks;
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static uint32_t tick_rate = 0;
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static uint32_t tick_rate_mhz = 0;
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static lk_time_t tick_interval_ms;
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static platform_timer_callback cb;
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static void *cb_args;
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typedef enum handler_return (*platform_timer_callback)(void *arg, lk_time_t now);
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status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, lk_time_t interval) {
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cb = callback;
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cb_args = arg;
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tick_interval_ms = interval;
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uint32_t ticks = tick_rate / ( 1000 / interval );
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NRF_CLOCK->LFCLKSRC = CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos;
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NRF_CLOCK->TASKS_LFCLKSTART = 1;
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NRF_RTC1->PRESCALER = ticks;
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NRF_RTC1->INTENSET = RTC_INTENSET_TICK_Enabled << RTC_INTENSET_TICK_Pos;
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NRF_RTC1->EVENTS_TICK = 0;
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NRF_RTC1->TASKS_START = 1;
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NVIC_EnableIRQ(RTC1_IRQn);
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return NO_ERROR;
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}
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lk_time_t current_time(void) {
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uint64_t t;
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do {
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t = current_ticks;
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} while (current_ticks != t);
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return t * tick_interval_ms;
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}
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lk_bigtime_t current_time_hires(void) {
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return current_time() * 1000;
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}
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void nrf51_RTC1_IRQ(void) {
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current_ticks++;
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arm_cm_irq_entry();
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NRF_RTC1->EVENTS_TICK = 0;
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bool resched = false;
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if (cb) {
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lk_time_t now = current_time();
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if (cb(cb_args, now) == INT_RESCHEDULE)
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resched = true;
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}
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arm_cm_irq_exit(resched);
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}
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void arm_cm_systick_init(uint32_t mhz) {
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tick_rate = mhz;
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tick_rate_mhz = mhz / 1000000;
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}
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