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/***************************************************************************//**
* @file drv_rtc.c
* @brief RTC driver of RT-Thread RTOS for EFM32
* COPYRIGHT (C) 2012, RT-Thread Development Team
* @author Bernard, onelife
* @version 1.0
*******************************************************************************
* @section License
* The license and distribution terms for this file may be found in the file
* LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
*******************************************************************************
* @section Change Logs
* Date Author Notes
* 2009-01-05 Bernard the first version
* 2010-12-27 onelife Modify for EFM32
* 2011-06-16 onelife Modify init function for efm32lib v2 upgrading
* 2011-12-14 onelife Move LFXO enabling routine to driver initialization
* function (board.c)
******************************************************************************/
/***************************************************************************//**
* @addtogroup efm32
* @{
******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "board.h"
#include "hdl_interrupt.h"
#include "drv_rtc.h"
#if defined(RT_USING_RTC)
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
#ifdef RT_RTC_DEBUG
#define rtc_debug(format,args...) rt_kprintf(format, ##args)
#else
#define rtc_debug(format,args...)
#endif
/* Private variables ---------------------------------------------------------*/
static struct rt_device rtc;
static rt_uint32_t rtc_time;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
static rt_err_t rt_rtc_open(rt_device_t dev, rt_uint16_t oflag)
{
if (dev->rx_indicate != RT_NULL)
{
/* Open Interrupt */
}
return RT_EOK;
}
static rt_size_t rt_rtc_read(
rt_device_t dev,
rt_off_t pos,
void* buffer,
rt_size_t size)
{
return 0;
}
/***************************************************************************//**
* @brief
* Configure RTC device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] cmd
* RTC control command
*
* @param[in] args
* Arguments
*
* @return
* Error code
******************************************************************************/
static rt_err_t rt_rtc_control(rt_device_t dev, rt_uint8_t cmd, void *args)
{
RT_ASSERT(dev != RT_NULL);
switch (cmd)
{
case RT_DEVICE_CTRL_RTC_GET_TIME:
*(rt_uint32_t *)args = rtc_time + RTC_CounterGet();
rtc_debug("RTC: get rtc_time %x + %x\n", rtc_time, RTC_CounterGet());
break;
case RT_DEVICE_CTRL_RTC_SET_TIME:
{
rtc_time = *(rt_uint32_t *)args;
rtc_debug("RTC: set rtc_time %x\n", rtc_time);
/* Reset counter */
RTC_CounterReset();
}
break;
}
return RT_EOK;
}
/***************************************************************************//**
* @brief
* RTC counter overflow interrupt handler
*
* @details
*
* @note
******************************************************************************/
void rt_hw_rtc_isr(rt_device_t device)
{
if (RTC->IF & RTC_IFC_OF)
{
rtc_time += _RTC_CNT_MASK;
}
RTC->IFC = _RTC_IFC_MASK;
}
/***************************************************************************//**
* @brief
* Register RTC device
*
* @details
*
* @note
*
* @param[in] device
* Pointer to device descriptor
*
* @param[in] name
* Device name
*
* @param[in] flag
* Configuration flags
*
* @return
* Error code
******************************************************************************/
rt_err_t rt_hw_rtc_register(
rt_device_t device,
const char *name,
rt_uint32_t flag)
{
RT_ASSERT(device != RT_NULL);
device->type = RT_Device_Class_RTC;
device->rx_indicate = RT_NULL;
device->tx_complete = RT_NULL;
device->init = RT_NULL;
device->open = rt_rtc_open;
device->close = RT_NULL;
device->read = rt_rtc_read;
device->write = RT_NULL;
device->control = rt_rtc_control;
device->user_data = RT_NULL; /* no private */
/* register a character device */
return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
}
/***************************************************************************//**
* @brief
* Initialize all RTC module related hardware and register RTC device to kernel
*
* @details
*
* @note
******************************************************************************/
void rt_hw_rtc_init(void)
{
rt_uint32_t reset;
reset = RMU_ResetCauseGet();
// TODO: What is the current reset mode?
if (reset & RMU_RSTCAUSE_PORST || reset & RMU_RSTCAUSE_EXTRST)
{
RTC_Init_TypeDef rtcInit;
efm32_irq_hook_init_t hook;
rtcInit.enable = true;
rtcInit.debugRun = false;
rtcInit.comp0Top = false;
rtc_time = 0UL;
rt_kprintf("rtc is not configured\n");
rt_kprintf("please configure with set_date and set_time\n");
/* Configuring clock */
CMU_ClockDivSet(cmuClock_RTC,cmuClkDiv_32768);
CMU_ClockEnable(cmuClock_RTC, true);
/* Initialize and enable RTC */
RTC_Reset();
RTC_Init(&rtcInit);
hook.type = efm32_irq_type_rtc;
hook.unit = 0;
hook.cbFunc = rt_hw_rtc_isr;
hook.userPtr = RT_NULL;
efm32_irq_hook_register(&hook);
/* Enabling Interrupt from RTC */
RTC_IntEnable(RTC_IFC_OF);
RTC_IntClear(RTC_IFC_OF);
NVIC_ClearPendingIRQ(RTC_IRQn);
NVIC_SetPriority(RTC_IRQn, EFM32_IRQ_PRI_DEFAULT);
NVIC_EnableIRQ(RTC_IRQn);
}
/* register rtc device */
rt_hw_rtc_register(&rtc, RT_RTC_NAME, EFM32_NO_DATA);
}
#endif
/***************************************************************************//**
* @}
******************************************************************************/
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