290 lines
7.4 KiB
C
290 lines
7.4 KiB
C
/******************************************************************//**
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* @file drv_rtc.c
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* @brief RTC driver of RT-Thread RTOS for EFM32
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* COPYRIGHT (C) 2009, RT-Thread Development Team
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* @author Bernard, onelife
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* @version 0.4 beta
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**********************************************************************
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* @section License
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* The license and distribution terms for this file may be found in the file LICENSE in this
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* distribution or at http://www.rt-thread.org/license/LICENSE
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**********************************************************************
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* @section Change Logs
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* Date Author Notes
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* 2009-01-05 Bernard the first version
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* 2010-12-27 onelife Modification for EFM32
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*********************************************************************/
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/******************************************************************//**
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* @addtogroup efm32
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* @{
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*********************************************************************/
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/* Includes -------------------------------------------------------------------*/
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#include "board.h"
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#include "hdl_interrupt.h"
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#include "drv_rtc.h"
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/* Private typedef -------------------------------------------------------------*/
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/* Private define --------------------------------------------------------------*/
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/* Private macro --------------------------------------------------------------*/
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/* Private variables ------------------------------------------------------------*/
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static rt_uint32_t rtc_time;
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static struct rt_device rtc;
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/* Private function prototypes ---------------------------------------------------*/
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static void startLfxoForRtc(void);
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/* Private functions ------------------------------------------------------------*/
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static rt_err_t rt_rtc_open(rt_device_t dev, rt_uint16_t oflag)
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{
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if (dev->rx_indicate != RT_NULL)
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{
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/* Open Interrupt */
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}
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return RT_EOK;
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}
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static rt_size_t rt_rtc_read(
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rt_device_t dev,
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rt_off_t pos,
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void* buffer,
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rt_size_t size)
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{
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return 0;
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}
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/******************************************************************//**
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* @brief
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* Configure RTC device
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*
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* @details
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*
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* @note
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*
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* @param[in] dev
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* Pointer to device descriptor
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*
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* @param[in] cmd
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* RTC control command
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*
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* @param[in] args
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* Arguments
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*
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* @return
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* Error code
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*********************************************************************/
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static rt_err_t rt_rtc_control(rt_device_t dev, rt_uint8_t cmd, void *args)
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{
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RT_ASSERT(dev != RT_NULL);
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switch (cmd)
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{
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case RT_DEVICE_CTRL_RTC_GET_TIME:
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*(rt_uint32_t *)args = rtc_time + RTC_CounterGet();
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break;
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case RT_DEVICE_CTRL_RTC_SET_TIME:
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{
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rtc_time = *(rt_uint32_t *)args;
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/* Reset counter */
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RTC_Enable(false);
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RTC_Enable(true);
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}
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break;
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}
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return RT_EOK;
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}
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/******************************************************************//**
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* @brief
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* RTC counter overflow interrupt handler
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*
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* @details
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*
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* @note
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*********************************************************************/
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void rt_hw_rtc_isr(rt_device_t device)
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{
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if (RTC->IF & RTC_IFC_OF)
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{
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rtc_time += _RTC_CNT_MASK;
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}
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RTC->IFC = _RTC_IFC_MASK;
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}
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/******************************************************************//**
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* @brief
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* Initialize all RTC module related hardware and register RTC device to kernel
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*
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* @details
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*
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* @note
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*********************************************************************/
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void rt_hw_rtc_init(void)
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{
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rt_uint32_t reset;
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rtc.type = RT_Device_Class_RTC;
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reset = RMU_ResetCauseGet();
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if (reset & RMU_RSTCAUSE_PORST || reset & RMU_RSTCAUSE_EXTRST) //TODO
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{
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RTC_Init_TypeDef rtcInit;
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efm32_irq_hook_init_t hook;
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rtcInit.enable = true;
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rtcInit.debugRun = false;
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rtcInit.comp0Top = false;
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rtc_time = 0UL;
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rt_kprintf("rtc is not configured\n");
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rt_kprintf("please configure with set_date and set_time\n");
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/* Configuring clocks in the Clock Management Unit (CMU) */
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startLfxoForRtc();
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/* Initialize and enable RTC */
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RTC_Init(&rtcInit);
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hook.type = efm32_irq_type_rtc;
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hook.unit = 0;
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hook.cbFunc = rt_hw_rtc_isr;
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hook.userPtr = RT_NULL;
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efm32_irq_hook_register(&hook);
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/* Enabling Interrupt from RTC */
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RTC_IntEnable(RTC_IFC_OF);
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RTC_IntClear(RTC_IFC_OF);
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NVIC_ClearPendingIRQ(RTC_IRQn);
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NVIC_SetPriority(RTC_IRQn, EFM32_IRQ_PRI_DEFAULT);
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NVIC_EnableIRQ(RTC_IRQn);
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}
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/* register rtc device */
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rtc.init = RT_NULL;
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rtc.open = rt_rtc_open;
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rtc.close = RT_NULL;
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rtc.read = rt_rtc_read;
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rtc.write = RT_NULL;
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rtc.control = rt_rtc_control;
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rtc.user_data = RT_NULL; /* no private */
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rt_device_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR);
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}
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/******************************************************************//**
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* @brief
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* Start LFXO for RTC
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*
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* @details
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* Starts the LFXO and routes it to the RTC. RTC clock is prescaled to save energy.
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*
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* @note
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*********************************************************************/
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static void startLfxoForRtc(void)
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{
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/* Starting LFXO and waiting until it is stable */
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CMU_OscillatorEnable(cmuOsc_LFXO, true, true);
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/* Routing the LFXO clock to the RTC */
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CMU_ClockDivSet(cmuClock_RTC,cmuClkDiv_32768);
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CMU_ClockSelectSet(cmuClock_LFA,cmuSelect_LFXO);
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CMU_ClockEnable(cmuClock_RTC, true);
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}
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/*********************************************************************
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* Export to FINSH
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*********************************************************************/
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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#include <time.h>
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time_t time(time_t* t)
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{
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rt_device_t device;
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time_t time;
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device = rt_device_find("rtc");
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if (device != RT_NULL)
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{
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rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
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if (t != RT_NULL) *t = time;
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}
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return time;
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}
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void set_date(rt_uint32_t year, rt_uint32_t month, rt_uint32_t day)
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{
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time_t now;
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struct tm* ti;
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rt_device_t device;
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ti = RT_NULL;
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/* get current time */
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time(&now);
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ti = localtime(&now);
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if (ti != RT_NULL)
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{
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ti->tm_year = year - 1900;
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ti->tm_mon = month - 1; /* ti->tm_mon = month; */
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ti->tm_mday = day;
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}
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now = mktime(ti);
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device = rt_device_find("rtc");
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if (device != RT_NULL)
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{
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rt_rtc_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
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}
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}
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FINSH_FUNCTION_EXPORT(set_date, set date. e.g: set_date(2010,2,28))
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void set_time(rt_uint32_t hour, rt_uint32_t minute, rt_uint32_t second)
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{
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time_t now;
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struct tm* ti;
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rt_device_t device;
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ti = RT_NULL;
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/* get current time */
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time(&now);
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ti = localtime(&now);
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if (ti != RT_NULL)
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{
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ti->tm_hour = hour;
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ti->tm_min = minute;
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ti->tm_sec = second;
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}
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now = mktime(ti);
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device = rt_device_find("rtc");
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if (device != RT_NULL)
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{
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rt_rtc_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
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}
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}
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FINSH_FUNCTION_EXPORT(set_time, set time. e.g: set_time(23,59,59))
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void list_date()
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{
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time_t now;
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time(&now);
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rt_kprintf("%s\n", ctime(&now));
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}
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FINSH_FUNCTION_EXPORT(list_date, show date and time.)
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#endif
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/******************************************************************//**
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* @}
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*********************************************************************/
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