/**
 * @file        main.c
 *
 * @brief       Main program body
 *
 * @version     V1.0.0
 *
 * @date        2025-10-30
 *
 * @attention
 *
 *  Copyright (C) 2025 Geehy Semiconductor
 *
 *  You may not use this file except in compliance with the
 *  GEEHY COPYRIGHT NOTICE (GEEHY SOFTWARE PACKAGE LICENSE).
 *
 *  The program is only for reference, which is distributed in the hope
 *  that it will be useful and instructional for customers to develop
 *  their software. Unless required by applicable law or agreed to in
 *  writing, the program is distributed on an "AS IS" BASIS, WITHOUT
 *  ANY WARRANTY OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the GEEHY SOFTWARE PACKAGE LICENSE for the governing permissions
 *  and limitations under the License.
 */

/* Includes ***************************************************************/
#include "main.h"

/* Private includes *******************************************************/
#include <stdio.h>

/* Private macro **********************************************************/
#define DEBUG_USART COM2_PORT

#define RTC_GET_HOUR(counter)   ((counter % 86400) / 3600)
#define RTC_GET_MINUTE(counter) ((counter % 3600) / 60)
#define RTC_GET_SECOND(counter) (counter % 60)

/* Private typedef ********************************************************/
typedef struct
{
    uint8_t Hour;
    uint8_t Minute;
    uint8_t Second;
} RTC_TimeStampTypeDef;

/* Private variables ******************************************************/

/* Private function prototypes ********************************************/
void DDL_SysClkConfig(void);
void RTC_Init(void);
void RTC_Convert_Counter_To_TimeStamp(RTC_TimeStampTypeDef *timeStamp, uint32_t counter);

/* External variables *****************************************************/

/* External functions *****************************************************/

/**
 * @brief   Main program
 *
 * @param   None
 *
 * @retval  None
 */
int main(void)
{ 
    /* Time stamp structure */
    RTC_TimeStampTypeDef timeStamp;

    /* USART init structure */
    DDL_USART_InitTypeDef USART_InitStruct = {0U};

    /* Configure system clock */
    DDL_SysClkConfig();

    /* USART Init */
    USART_InitStruct.BaudRate            = 115200U;
    USART_InitStruct.DataWidth           = DDL_USART_DATAWIDTH_8B;
    USART_InitStruct.StopBits            = DDL_USART_STOPBITS_1;
    USART_InitStruct.Parity              = DDL_USART_PARITY_NONE ;
    USART_InitStruct.TransferDirection   = DDL_USART_DIRECTION_TX_RX;
    USART_InitStruct.HardwareFlowControl = DDL_USART_HWCONTROL_NONE;
    USART_InitStruct.OverSampling        = DDL_USART_OVERSAMPLING_16;
    BOARD_COMInit(COM2, &USART_InitStruct);

    /* RTC Init */
    RTC_Init();

    /* Infinite loop */
    while (1)
    {
        /* Check RTC second flag  */
        if(DDL_RTC_IsActiveFlag_SEC(RTC))
        {
            RTC_Convert_Counter_To_TimeStamp(&timeStamp, DDL_RTC_GetTime(RTC));

            printf("%02d:%02d:%02d\n", timeStamp.Hour, timeStamp.Minute, timeStamp.Second);

            DDL_RTC_ClearFlag_SEC(RTC);
        }
    }
}

/**
 * @brief   System clock configuration
 *
 * @param   None
 *
 * @retval  None
 */
void DDL_SysClkConfig(void)
{
    /* Unlock clock control registers */
    /* Wait until the registers are unlocked */
    DDL_RCM_Unlock();
    while ((RCM->KEY & RCM_KEY_KEYST) != RCM_KEY_KEYST) 
    { 
    }

    /* Enable HSE and wait for ready */
    /* Enable HSE input clock */
    DDL_RCM_HSE_Enable();
    /* Wait until HSE is ready */
    while (DDL_RCM_HSE_IsReady() != 1) 
    {
        /* wait for HSERDY */
    }

    /* Configure Flash wait states appropriate for 120 MHz */
    /* Set Flash wait period to accommodate higher frequency */
    DDL_FLASH_SetWaitPeriod(FLASH_DDL_WAIT_PERIOD_3);
    /* Set Flash erase time base to 120 MHz (use 119 to represent 120 MHz) */
    DDL_FLASH_SetEraseTimeBase(119);

    /* Configure PLL */
    /* Ensure PLL is disabled prior to configuration */
    DDL_RCM_PLL_Disable();

    /* Configure PLL settings: multiplier, prescaler, and clock source */
    /* PLL multiplier set to 15 (x15), prescaler no division, clock source from HSE */
    DDL_RCM_PLL_SetMultiplier(15);
    DDL_RCM_PLL_SetPrescaler(DDL_RCM_PLL_DIV1);
    DDL_RCM_PLL_SetClkSource(DDL_RCM_PLL_CLKSOURCE_HSE);

    /* Enable PLL and wait for ready */
    DDL_RCM_PLL_Enable();
    while (DDL_RCM_PLL_IsReady() != 1)
    {
        /* wait for PLL Ready */
    }

    /* Switch system clock to PLL output */
    DDL_RCM_SetSysClkSource(DDL_RCM_SYS_CLKSOURCE_PLL);

    /* Enable clock switch and wait for completion */
    DDL_RCM_EnableSysClkSwitch();
    while (DDL_RCM_IsActiveFlag_SWDONE() != 1)
    {
    }

    /* Set AHB, APB prescalers */
    DDL_RCM_SetAHBPrescaler(DDL_RCM_AHB_DIV_1);
    DDL_RCM_SetAPBPrescaler(DDL_RCM_APB_DIV_1);
    
    /* Disable temporary clock switch controls (if applicable) */
    DDL_RCM_DisableSysClkSwitch();
    
    /* Lock clock control registers */
    DDL_RCM_Unlock();

    /* Update SystemCoreClock if used by the project */
    SystemCoreClockUpdate();
}

/**
 * @brief   RTC Initialize
 *
 * @param   None
 *
 * @retval  None
 */
void RTC_Init(void)
{
    /* RTC init structure */
    DDL_RTC_InitTypeDef RTC_InitStruct = {0U};

    DDL_RCM_Unlock();
    DDL_RCM_EnableAPBPeripheral(DDL_RCM_APB_PERIPHERAL_BKP);
    DDL_RCM_DisableBackupWriteProtect();
    DDL_RCM_LSI_Enable();
    while(!DDL_RCM_LSI_IsReady());
    DDL_RTC_SetClkSource(DDL_RTC_CLOCK_SOURCE_LSI);
    DDL_RCM_Lock();

    /* RTC frequency = 32K / (31999 + 1) Hz = 1Hz */
    RTC_InitStruct.Prescaler =  31999;

    DDL_RTC_Init(RTC, &RTC_InitStruct);
    DDL_RTC_ClearFlag_SEC(RTC);
    /* Enable RTC */
    DDL_RTC_EnableClk();
}

/**
 * @brief   RTC Initialize
 *
 * @param   timeStamp : this value is a time stamp structure
 * @param   counter : this value can between 0x0 to 0xFFFFFFFF
 *
 * @retval  None
 */
void RTC_Convert_Counter_To_TimeStamp(RTC_TimeStampTypeDef *timeStamp, uint32_t counter)
{
    timeStamp->Hour   = RTC_GET_HOUR(counter);
    timeStamp->Minute = RTC_GET_MINUTE(counter);
    timeStamp->Second = RTC_GET_SECOND(counter);
}

#if defined(__CC_ARM) || defined(__ARMCC_VERSION)
/*!
* @brief       Redirect C Library function printf to serial port.
*              After Redirection, you can use printf function.
*
* @param       ch:  The characters that need to be send.
*
* @param       *f:  pointer to a FILE that can recording all information
*              needed to control a stream
*
* @retval      The characters that need to be send.
*
* @note
*/
int fputc(int ch, FILE* f)
{
    /* send a byte of data to the serial port */
    DDL_USART_TransmitData8(DEBUG_USART, (uint8_t)ch);
    
    /* wait for the data to be send */
    while (DDL_USART_IsActiveFlag_TC(DEBUG_USART) == RESET);

    return (ch);
}
#elif defined(__ICCARM__)

/*!
* @brief       Redirect C Library function printf to serial port.
*              After Redirection, you can use printf function.
*
* @param       ch:  The characters that need to be send.
*
* @retval      The characters that need to be send.
*
* @note
*/
int __io_putchar(int ch)
{
    /* send a byte of data to the serial port */
    DDL_USART_TransmitData8(DEBUG_USART, (uint8_t)ch);
    
    /* wait for the data to be send */
    while (DDL_USART_IsActiveFlag_TC(DEBUG_USART) == RESET);

    return (ch);
}

/*!
* @brief       Redirect C Library function printf to serial port.
*              After Redirection, you can use printf function.
*
* @param       file:  Meaningless in this function.
*
* @param       *ptr:  Buffer pointer for data to be sent.
*
* @param       len:  Length of data to be sent.
*
* @retval      The characters that need to be send.
*
* @note
*/
int __write(int file, char* ptr, int len)
{
    int i;
    for (i = 0; i < len; i++)
    {
        __io_putchar(*ptr++);
    }

    return len;
}
#elif defined (__clang__) && !defined (__ARMCC_VERSION)

int uart_putc(char ch, FILE *file)
{
    /* send a byte of data to the serial port */
    DDL_USART_TransmitData8(DEBUG_USART, (uint8_t)ch);
    
    /* wait for the data to be send */
    while (DDL_USART_IsActiveFlag_TC(DEBUG_USART) == RESET);

    return (ch);
}

static FILE __stdio = FDEV_SETUP_STREAM(uart_putc, NULL, NULL, _FDEV_SETUP_WRITE);
FILE *const stdin = &__stdio;

__strong_reference(stdin, stdout);
__strong_reference(stdin, stderr);

#else

#warning Not supported compiler type
#endif
