91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <nrf51.h>
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#include <nrf51_bitfields.h>
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#include "board.h"
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#include "uart.h"
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/**
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* @addtogroup NRF51822
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*/
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/*@{*/
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#define LFCLK_FREQUENCY (32768UL) /**< LFCLK frequency in Hertz, constant. */
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#define RTC_FREQUENCY (800UL) /**< Required RTC working clock RTC_FREQUENCY Hertz. Changable. */
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#define COUNTER_PRESCALER ((LFCLK_FREQUENCY / RTC_FREQUENCY) - 1) /* f = LFCLK/(prescaler + 1) */
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/** @brief Function starting the internal LFCLK XTAL oscillator.
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*/
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void lfclk_config(void)
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{
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NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
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NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
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NRF_CLOCK->TASKS_LFCLKSTART = 1;
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while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0)
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{
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//Do nothing.
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}
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NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
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}
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/** @brief Function for configuring the RTC with TICK to 100Hz.
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*/
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void rtc_config(void)
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{
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NVIC_EnableIRQ(RTC0_IRQn); // Enable Interrupt for the RTC in the core.
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NRF_RTC0->PRESCALER = COUNTER_PRESCALER; // Set prescaler to a TICK of RTC_FREQUENCY.
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// Enable TICK event and TICK interrupt:
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NRF_RTC0->EVTENSET = RTC_EVTENSET_TICK_Msk;
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NRF_RTC0->INTENSET = RTC_INTENSET_TICK_Msk;
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}
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/** @brief: Function for handling the RTC0 interrupts.
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* Triggered on TICK and COMPARE0 match.
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*/
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void RTC0_IRQHandler(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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if ((NRF_RTC0->EVENTS_TICK != 0) &&
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((NRF_RTC0->INTENSET & RTC_INTENSET_TICK_Msk) != 0))
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{
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NRF_RTC0->EVENTS_TICK = 0;
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rt_tick_increase(); //This function will notify kernel there is one tick passed
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}
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/* leave interrupt */
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rt_interrupt_leave();
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}
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/**
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* This function will initial NRF51822 board.
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*/
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void rt_hw_board_init()
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{
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//lfclk_config();
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rtc_config();
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NRF_RTC0->TASKS_START = 1;
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/* Initial usart deriver, and set console device */
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rt_hw_uart_init();
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#ifdef RT_USING_CONSOLE
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rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
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#endif
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}
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/*@}*/
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