rt-thread/bsp/efm32/drv_rtc.c

/***************************************************************************//**
 * @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, int 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

/***************************************************************************//**
 * @}
 ******************************************************************************/