/**
  ******************************************************************************
  * @file    main.c
  * @author  MCU Application Team
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2023 Puya Semiconductor Co.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by Puya under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "py32m030xx_ll_Start_Kit.h"

/* Private define ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
uint8_t aTxBuffer[] = "Auto BaudRate Test";
uint8_t aRxBuffer[30];

uint8_t *TxBuff = NULL;
__IO uint16_t TxSize = 0;
__IO uint16_t TxCount = 0;

uint8_t *RxBuff = NULL;
__IO uint16_t RxSize = 0;
__IO uint16_t RxCount = 0;

__IO ITStatus UartReady = RESET;

/* Private user code ---------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static void APP_SystemClockConfig(void);
static void APP_ConfigUsart(USART_TypeDef *USARTx);
static void APP_UsartTransmit_IT(USART_TypeDef *USARTx, uint8_t *pData, uint16_t Size);
static void APP_UsartReceive_IT(USART_TypeDef *USARTx, uint8_t *pData, uint16_t Size);

/**
  * @brief  Main program.
  * @param  None
  * @retval int
  */
int main(void)
{
  /* Configure system clock */
  APP_SystemClockConfig();

  /* Configure USART */
  APP_ConfigUsart(USART1);
  
  /* Receive 1 character data for baud rate detection */
  APP_UsartReceive_IT(USART1, (uint8_t *)aRxBuffer, 1);

  while (1)
  {
    if ((LL_USART_IsActiveFlag_ABRE(USART1) == 0) && (LL_USART_IsActiveFlag_ABRF(USART1) == 1))
    {
      /* Clear auto baud rate detection complete flag */
      LL_USART_SendAutoBaudRateReq(USART1);
      /* Send data */
      APP_UsartTransmit_IT(USART1, (uint8_t*)aTxBuffer, sizeof(aTxBuffer)-1);
    }
  }
}

/**
  * @brief  System clock configuration function
  * @param  None
  * @retval None
  */
static void APP_SystemClockConfig(void)
{
  /* Enable HSI */
  LL_RCC_HSI_Enable();
  while(LL_RCC_HSI_IsReady() != 1)
  {
  }

  /* Set AHB prescaler */
  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);

  /* Configure HSISYS as system clock source */
  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSISYS);
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSISYS)
  {
  }

  /* Set APB1 prescaler */
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
  LL_Init1msTick(8000000);

  /* Update system clock global variable SystemCoreClock (can also be updated by calling SystemCoreClockUpdate function) */
  LL_SetSystemCoreClock(8000000);
}

/**
  * @brief  USART configuration function
  * @param  USARTx：USART module, can be USART1 or USART2
  * @retval None
  */
static void APP_ConfigUsart(USART_TypeDef *USARTx)
{
  /* Enable clock, initialize pins, enable NVIC interrupt */
  if (USARTx == USART1) 
  {
    /* Enable GPIOA clock */
    LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
    /* Enable USART1 clock */
    LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_USART1);
    
    /* GPIOA configuration */
    LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
    /* Select pin 2 */
    GPIO_InitStruct.Pin = LL_GPIO_PIN_2;
    /* Select alternate function mode */
    GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
    /* Select output speed */
    GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH;
    /* Select push-pull output mode */
    GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
    /* Select pull-up */
    GPIO_InitStruct.Pull = LL_GPIO_PULL_UP;
    /* Select USART1 function */
    GPIO_InitStruct.Alternate = LL_GPIO_AF1_USART1;
    /* Initialize GPIOA */
    LL_GPIO_Init(GPIOA,&GPIO_InitStruct);
    
    /* Select pin 3 */
    GPIO_InitStruct.Pin = LL_GPIO_PIN_3;
    /* Select USART1 function */
    GPIO_InitStruct.Alternate = LL_GPIO_AF1_USART1;
    /* Initialize GPIOA */
    LL_GPIO_Init(GPIOA,&GPIO_InitStruct);
    
    /* Set USART1 interrupt priority */
    NVIC_SetPriority(USART1_IRQn,0);
    /* Enable USART1 interrupt */
    NVIC_EnableIRQ(USART1_IRQn);
  }
  else if (USARTx == USART2)
  {
    /* Enable GPIOA clock */
    LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
    /* Enable USART1 clock */
    LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_USART2);
    
    /* GPIOA configuration */
    LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
    /* Select pin 2 */
    GPIO_InitStruct.Pin = LL_GPIO_PIN_2;
    /* Select alternate function mode */
    GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
    /* Select output speed */
    GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH;
    /* Select push-pull output mode */
    GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
    /* Select pull-up */
    GPIO_InitStruct.Pull = LL_GPIO_PULL_UP;
    /* Select USART2 function */
    GPIO_InitStruct.Alternate = LL_GPIO_AF4_USART2;
    /* Initialize GPIOA */
    LL_GPIO_Init(GPIOA,&GPIO_InitStruct);
    
    /* Select pin 3 */
    GPIO_InitStruct.Pin = LL_GPIO_PIN_3;
    /* Select USART2 function */
    GPIO_InitStruct.Alternate = LL_GPIO_AF4_USART2;
    /* Initialize GPIOA */
    LL_GPIO_Init(GPIOA,&GPIO_InitStruct);
    
    /* Set USART1 interrupt priority */
    NVIC_SetPriority(USART2_IRQn,0);
    /* Enable USART1 interrupt */
    NVIC_EnableIRQ(USART2_IRQn);
  }
  
  /* USART configuration */
  LL_USART_InitTypeDef USART_InitStruct = {0};
  /* Set baud rate */
  USART_InitStruct.BaudRate = 9600;
  /* Set data width */
  USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
  /* Set stop bits */
  USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
  /* Set parity */
  USART_InitStruct.Parity = LL_USART_PARITY_NONE;
  USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
  USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
  USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_16;
  /* Initialize USART */
  LL_USART_Init(USARTx, &USART_InitStruct);
  
  /* Configure as full duplex asynchronous mode */
  LL_USART_ConfigAsyncMode(USARTx);
  
  /* Enable UART module */
  LL_USART_Enable(USARTx);
  
  /* Configure auto baud rate detection */
  LL_USART_SetAutoBaudRateMode(USARTx, LL_USART_AUTOBAUDRATE_ONFALLINGEDGE);
  LL_USART_EnableAutoBaudRate(USARTx);
}

/**
  * @brief  USART transmit function
  * @param  USARTx：USART module, can be USART1 or USART2
  * @param  pData：transmit buffer
  * @param  Size：Size of the transmit buffer
  * @retval None
  */
static void APP_UsartTransmit_IT(USART_TypeDef *USARTx, uint8_t *pData, uint16_t Size)
{
  TxBuff = pData;
  TxSize = Size;
  TxCount = Size;

  /*Enable transmit data register empty interrupt*/
  LL_USART_EnableIT_TXE(USARTx); 
}

/**
  * @brief  USART receive function
  * @param  USARTx：USART module, can be USART1 or USART2
  * @param  pData：receive buffer
  * @param  Size：Size of the receive buffer
  * @retval None
  */
static void APP_UsartReceive_IT(USART_TypeDef *USARTx, uint8_t *pData, uint16_t Size)
{
  RxBuff = pData;
  RxSize = Size;
  RxCount = Size;

  /* Enable parity error interrupt */
  LL_USART_EnableIT_PE(USARTx);  
  /* Enable error interrupt */
  LL_USART_EnableIT_ERROR(USARTx); 
  /* Enable receive data register not empty interrupt */
  LL_USART_EnableIT_RXNE(USARTx); 
}

/**
  * @brief  USART interrupt callback function
  * @param  USARTx：USART module, can be USART1 or USART2
  * @retval None
  */
void APP_UsartIRQCallback(USART_TypeDef *USARTx)
{
  /* Receive data register not empty */
  uint32_t errorflags = (LL_USART_IsActiveFlag_PE(USARTx) | LL_USART_IsActiveFlag_FE(USARTx) |\
                         LL_USART_IsActiveFlag_ORE(USARTx) | LL_USART_IsActiveFlag_NE(USARTx));
  if (errorflags == RESET)
  {
    if ((LL_USART_IsActiveFlag_RXNE(USARTx) != RESET) && (LL_USART_IsEnabledIT_RXNE(USARTx) != RESET))
    {
      *RxBuff = LL_USART_ReceiveData8(USARTx);
       RxBuff++;
      
      if (--RxCount == 0U)
      {
        LL_USART_DisableIT_RXNE(USARTx);
        LL_USART_DisableIT_PE(USARTx);
        LL_USART_DisableIT_ERROR(USARTx);
      }
      
      return;
    }
  }
  
  /* Receive error occurred */
  if (errorflags != RESET)
  {
    /* Used for auto baud rate detection */
    if ((LL_USART_IsActiveFlag_RXNE(USARTx) != RESET) && (LL_USART_IsEnabledIT_RXNE(USARTx) != RESET))
    {
      *RxBuff = LL_USART_ReceiveData8(USARTx);
       RxBuff++;
      
      if (--RxCount == 0U)
      {
        LL_USART_DisableIT_RXNE(USARTx);
        LL_USART_DisableIT_PE(USARTx);
        LL_USART_DisableIT_ERROR(USARTx);
      }
      
      return;
    }
  }
  
  /* Transmit data register empty */
  if ((LL_USART_IsActiveFlag_TXE(USARTx) != RESET) && (LL_USART_IsEnabledIT_TXE(USARTx) != RESET))
  {
    LL_USART_TransmitData8(USARTx, *TxBuff);
    TxBuff++;
    
    if (--TxCount == 0U)
    { 
      LL_USART_DisableIT_TXE(USARTx);
      
      LL_USART_EnableIT_TC(USARTx);
    }
    
    return;
  }
  
  /* Transmission complete */
  if ((LL_USART_IsActiveFlag_TC(USARTx) != RESET) && (LL_USART_IsEnabledIT_TC(USARTx) != RESET))
  {
    LL_USART_DisableIT_TC(USARTx);
  
    return;
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
void APP_ErrorHandler(void)
{
  /* Infinite loop */
  while (1)
  {
  }
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* User can add his own implementation to report the file name and line number,
     for example: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* Infinite loop */
  while (1)
  {
  }
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT Puya *****END OF FILE******************/
