/*****************************************************************************
 * Copyright (c) 2019, Nsing Technologies Pte. Ltd.
 *
 * All rights reserved.
 * ****************************************************************************
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Nations' name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY NATIONS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL NATIONS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ****************************************************************************/

/**
 * @file main.c
 * @author Nations
 * @version v1.0.1
 *
 * @copyright Copyright (c) 2019, Nsing Technologies Pte. Ltd. All rights reserved.
 */
#include "main.h"
#include <stdio.h>
#include <stdint.h>
#include "log.h"
#include "n32g45x_rtc.h"
#include "n32g45x.h"
#include "User_RTC_Config.h"
#include "User_LED_Config.h"

/** @addtogroup RTC_Calendar
 * @{
 */

/**
 * @brief  Configure the system tick clock.
 */
uint32_t DBG_SysTick_Config(uint32_t ticks)
{
   if (ticks > SysTick_LOAD_RELOAD_Msk)
      return (1);                                                        /* Reload value impossible */
   SysTick->LOAD = (ticks & SysTick_LOAD_RELOAD_Msk) - 1;                /* set reload register */
   NVIC_SetPriority(SysTick_IRQn, (1 << __NVIC_PRIO_BITS) - 1);          /* set Priority for Cortex-M0 System Interrupts */
   SysTick->VAL = 0;                                                     /* Load the SysTick Counter Value */
   SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk; /* Enable SysTick IRQ and SysTick Timer */
   SysTick->CTRL &= ~SysTick_CTRL_TICKINT_Msk;
   return (0); /* Function successful */
}

/**
 * @brief  Use the system tick clock to delay.
 */
void SysTick_Delay_Ms(__IO uint32_t ms)
{
   uint32_t i;
   RCC_ClocksType RCC_Clocks;
   RCC_GetClocksFreqValue(&RCC_Clocks);
   DBG_SysTick_Config(RCC_Clocks.SysclkFreq / 1000);
   for (i = 0; i < ms; i++)
   {
      /* When the value of the counter is reduced to 0, the bit 16 of the CRTL register is set to 1.
         When set to 1, the bit  will cleared to 0 with read
      */
      while (!((SysTick->CTRL) & (1 << 16)))
         ;
   }
   // Disable SysTick timer
   SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
}

/**
 * @brief  Main program.
 */
int main(void)
{
   /*!< At this stage the microcontroller clock setting is already configured,
        this is done through SystemInit() function which is called from startup
        file (startup_n32g45x_xx.s) before to branch to application main.
        To reconfigure the default setting of SystemInit() function, refer to
        system_n32g45x.c file
      */
   /* Initialize LEDs on n32g45x-EVAL board */
   LEDInit(LED1_PORT, LED1_PIN);
   LEDOff(LED1_PORT, LED1_PIN);
   /* Initialize USART,TX: PA9*/
   log_init();
   log_info("RTC Init");
   /* RTC date and time default value*/
   RTC_DateAndTimeDefaultVale();
   /* Enable the PWR clock */
   RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_PWR | RCC_APB1_PERIPH_BKP, ENABLE);
   /* Allow access to RTC */
   PWR_BackupAccessEnable(ENABLE);
   if (USER_WRITE_BKP_DAT1_DATA != BKP_ReadBkpData(BKP_DAT1))
   {
      /* RTC clock source select */
      if (SUCCESS == RTC_CLKSourceConfig(RTC_CLK_SRC_TYPE_LSE, true, false))
      {
         RTC_PrescalerConfig();
         /* Adjust time by values entered by the user on the hyperterminal */
         RTC_DateRegulate();
         RTC_TimeRegulate();
         BKP_WriteBkpData(BKP_DAT1, USER_WRITE_BKP_DAT1_DATA);
         log_info("\r\n RTC Init Success\r\n");
      }
      else
      {
         log_info("\r\n RTC Init Faile\r\n");
      }
   }
   /* Adjust time by values entered by the user on the hyperterminal */
   RTC_ConfigCalibOutput(RTC_CALIB_OUTPUT_1HZ);
   /* Calibrate output config,push pull */
   RTC_ConfigOutputType(RTC_OUTPUT_PUSHPULL);
   /* Calibrate output enable*/
   RTC_EnableCalibOutput(ENABLE);
   /* Configure EXTI PD8 pin  connected to RTC TimeStamp
   (while externally feeding PD8 with 1HZ signal output from PC13)*/
   EXTI_PB8_TimeStamp_Configuration();
   /* clear RTC time stamp flag  */
   RTC_ClrFlag(RTC_FLAG_TISF);
   RTC_ClrFlag(RTC_FLAG_TISOVF);
   while (1)
   {
      if (RTC_GetFlagStatus(RTC_FLAG_TISF) != RESET)
      {
         /* Every interval delay (1s) displays calendar and clock stamp register contents*/
         RTC_DateShow();
         RTC_TimeShow();
         RTC_TimeStampShow();
         RTC_ClrFlag(RTC_FLAG_TISF);
         RTC_ClrFlag(RTC_FLAG_TISOVF);
      }
      SysTick_Delay_Ms(1000);
   }
}
