/*****************************************************************************
 * Copyright (c) 2019, Nations Technologies Inc.
 *
 * 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 hw_config.c
 * @author Nations
 * @version v1.0.1
 *
 * @copyright Copyright (c) 2019, Nations Technologies Inc. All rights reserved.
 */
/* Includes ------------------------------------------------------------------*/

#include "usb_lib.h"
#include "usb_prop.h"
#include "usb_desc.h"
#include "hw_config.h"
#include "usb_pwr.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
ErrorStatus HSEStartUpStatus;
USART_InitType USART_InitStructure;
EXTI_InitType EXTI_InitStructure;
uint8_t  USART_Rx_Buffer [USART_RX_DATA_SIZE]; 
uint32_t USART_Rx_ptr_in = 0;
uint32_t USART_Rx_ptr_out = 0;
uint32_t USART_Rx_length  = 0;
uint8_t  USB_Tx_State = 0;

/* Extern variables ----------------------------------------------------------*/
extern LINE_CODING linecoding;

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name  : Set_System
* Description    : Configures Main system clocks & power
* Input          : None.
* Return         : None.
*******************************************************************************/
void Set_System(void)
{
    EXTI_InitType EXTI_InitStructure;

    /* Configure the EXTI line 18 connected internally to the USB IP */
    EXTI_ClrITPendBit(EXTI_LINE18);
	EXTI_InitStruct(&EXTI_InitStructure);
    EXTI_InitStructure.EXTI_Line = EXTI_LINE18; 
    EXTI_InitStructure.EXTI_Mode    = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_InitPeripheral(&EXTI_InitStructure);

}

/*******************************************************************************
* Function Name  : Set_USBClock
* Description    : Configures USB Clock input (48MHz)
* Input          : None.
* Return         : None.
*******************************************************************************/
void Set_USBClock(void)
{
    /* Select USBCLK source */
    RCC_ConfigUsbClk(RCC_USBCLK_SRC_PLLCLK_DIV3);
    /* Enable the USB clock */
    RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_USB, ENABLE);
}

/*******************************************************************************
* Function Name  : Enter_LowPowerMode
* Description    : Power-off system clocks and power while entering suspend mode
* Input          : None.
* Return         : None.
*******************************************************************************/
void Enter_LowPowerMode(void)
{
    /* Set the device state to suspend */
    bDeviceState = SUSPENDED;
}

/*******************************************************************************
* Function Name  : Leave_LowPowerMode
* Description    : Restores system clocks and power while exiting suspend mode
* Input          : None.
* Return         : None.
*******************************************************************************/
void Leave_LowPowerMode(void)
{
    USB_DeviceMess *pInfo = &Device_Info;

    /* Set the device state to the correct state */
    if (pInfo->CurrentConfiguration != 0)
    {
        /* Device configured */
        bDeviceState = CONFIGURED;
    }
    else
    {
        bDeviceState = ATTACHED;
    }
}

/**
  * @brief  Configures USART1 port.
  * @param  USART_InitStruct: pointer to a USART_InitType structure that
  *   contains the configuration information for the specified USART peripheral.
  * @retval None
  */
void USART_COM_Init(USART_InitType* USART_InitStruct)
{
    GPIO_InitType GPIO_InitStructure;
    NVIC_InitType NVIC_InitStructure;

    /* Enable GPIO clock */
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOA | RCC_APB2_PERIPH_AFIO, ENABLE);
    /* Enable USART1 Clock */
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_USART1, ENABLE);

    GPIO_InitStruct(&GPIO_InitStructure);
    /* Configure USART1 Tx as alternate function push-pull */
    GPIO_InitStructure.Pin = GPIO_PIN_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);


    /* Configure USART1 Rx as input floating */
    GPIO_InitStructure.Pin = GPIO_PIN_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);

    /* Enable the USARTy Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel            = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd         = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    /* USART1 configuration */
    USART_Init(USART1, USART_InitStruct);

    /* Enable the USART1 Receive interrupt */
    USART_ConfigInt(USART1, USART_INT_RXDNE, ENABLE);

    /* Enable USART1 */
    USART_Enable(USART1, ENABLE);
}

/*******************************************************************************
* Function Name  : USB_Interrupts_Config
* Description    : Configures the USB interrupts
* Input          : None.
* Return         : None.
*******************************************************************************/
void USB_Interrupts_Config(void)
{
    NVIC_InitType NVIC_InitStructure;

    /* 2 bit for pre-emption priority, 2 bits for subpriority */
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

    /* Enable the USB interrupt */
    NVIC_InitStructure.NVIC_IRQChannel                   = USB_LP_CAN1_RX0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority        = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    /* Enable the USB Wake-up interrupt */
    NVIC_InitStructure.NVIC_IRQChannel                   = USBWakeUp_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

/*******************************************************************************
* Function Name  :  USART_Config_Default.
* Description    :  configure the EVAL_COM1 with default values.
* Input          :  None.
* Return         :  None.
*******************************************************************************/
void USART_Config_Default(void)
{
  /* USART1 default configuration */
  /* USART1 configured as follow:
        - BaudRate = 115200 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - Parity Odd
        - Hardware flow control disabled
        - Receive and transmit enabled
  */
    USART_InitStructure.BaudRate = 115200;
    USART_InitStructure.WordLength          = USART_WL_8B;
    USART_InitStructure.StopBits            = USART_STPB_1;
    USART_InitStructure.Parity              = USART_PE_NO;
    USART_InitStructure.HardwareFlowControl = USART_HFCTRL_NONE;
    USART_InitStructure.Mode                = USART_MODE_RX | USART_MODE_TX;

    /* Configure and enable the USART1 */
    USART_COM_Init(&USART_InitStructure);
}

/*******************************************************************************
* Function Name  :  USART_Config.
* Description    :  Configure the EVAL_COM1 according to the line coding structure.
* Input          :  None.
* Return         :  Configuration status
                    TRUE : configuration done with success
                    FALSE : configuration aborted.
*******************************************************************************/
bool USART_Config(void)
{

    /* set the Stop bit*/
    switch (linecoding.format)
    {
        case 0:
          USART_InitStructure.StopBits = USART_STPB_1;
          break;
        case 1:
          USART_InitStructure.StopBits = USART_STPB_1_5;
          break;
        case 2:
          USART_InitStructure.StopBits = USART_STPB_2;
          break;
        default :
        {
          USART_Config_Default();
          return (false);
        }
    }

    /* set the parity bit*/
    switch (linecoding.paritytype)
    {
        case 0:
          USART_InitStructure.Parity = USART_PE_NO;
          break;
        case 1:
          USART_InitStructure.Parity = USART_PE_EVEN;
          break;
        case 2:
          USART_InitStructure.Parity = USART_PE_ODD;
          break;
        default :
        {
          USART_Config_Default();
          return (false);
        }
    }

    /*set the data type : only 8bits and 9bits is supported */
    switch (linecoding.datatype)
    {
        case 0x07:
          /* With this configuration a parity (Even or Odd) should be set */
          USART_InitStructure.WordLength = USART_WL_8B;
          break;
        case 0x08:
          if (USART_InitStructure.Parity == USART_PE_NO)
          {
            USART_InitStructure.WordLength = USART_WL_8B;
          }
          else 
          {
            USART_InitStructure.WordLength = USART_WL_9B;
          }
          
          break;
        default :
        {
          USART_Config_Default();
          return (false);
        }
    }

    USART_InitStructure.BaudRate = linecoding.bitrate;
    USART_InitStructure.HardwareFlowControl = USART_HFCTRL_NONE;
    USART_InitStructure.Mode = USART_MODE_RX | USART_MODE_TX;

    /* Configure and enable the USART */
    USART_COM_Init(&USART_InitStructure);

    return (true);
}

/*******************************************************************************
* Function Name  : USB_To_USART_Send_Data.
* Description    : send the received data from USB to the UART 0.
* Input          : data_buffer: data address.
                   Nb_bytes: number of bytes to send.
* Return         : none.
*******************************************************************************/
void USB_To_USART_Send_Data(uint8_t* data_buffer, uint8_t Nb_bytes)
{
    uint32_t i;

    for (i = 0; i < Nb_bytes; i++)
    {
        USART_SendData(USART1, *(data_buffer + i));
        while(USART_GetFlagStatus(USART1, USART_FLAG_TXDE) == RESET); 
    }
}

/*******************************************************************************
* Function Name  : Handle_USBAsynchXfer.
* Description    : send data to USB.
* Input          : None.
* Return         : none.
*******************************************************************************/
void Handle_USBAsynchXfer (void)
{
    uint16_t USB_Tx_ptr;
    uint16_t USB_Tx_length;

    if(USB_Tx_State == 0)
    {
        if (USART_Rx_ptr_out == USART_RX_DATA_SIZE)
        {
            USART_Rx_ptr_out = 0;
        }

        if(USART_Rx_ptr_out == USART_Rx_ptr_in) 
        {
            USB_Tx_State = 0; 
            return;
        }
        if(USART_Rx_ptr_out > USART_Rx_ptr_in) /* rollback */
        { 
            USART_Rx_length = USART_RX_DATA_SIZE - USART_Rx_ptr_out;
        }
        else 
        {
            USART_Rx_length = USART_Rx_ptr_in - USART_Rx_ptr_out;
        }
    
        if (USART_Rx_length > VIRTUAL_COM_PORT_DATA_SIZE)
        {
            USB_Tx_ptr = USART_Rx_ptr_out;
            USB_Tx_length = VIRTUAL_COM_PORT_DATA_SIZE;

            USART_Rx_ptr_out += VIRTUAL_COM_PORT_DATA_SIZE;
            USART_Rx_length -= VIRTUAL_COM_PORT_DATA_SIZE;
            USB_Tx_State = 1; 
        }
        else
        {
            USB_Tx_ptr = USART_Rx_ptr_out;
            USB_Tx_length = USART_Rx_length;

            USART_Rx_ptr_out += USART_Rx_length;
            USART_Rx_length = 0;
            if(USB_Tx_length == VIRTUAL_COM_PORT_DATA_SIZE)
            {
                USB_Tx_State = 2;
            }
            else
            {
                USB_Tx_State = 1;
            }
        }
        USB_CopyUserToPMABuf(&USART_Rx_Buffer[USB_Tx_ptr], ENDP1_TXADDR, USB_Tx_length);
        USB_SetEpTxCnt(ENDP1, USB_Tx_length);
        USB_SetEpTxValid(ENDP1); 
    }
}
/*******************************************************************************
* Function Name  : UART_To_USB_Send_Data.
* Description    : send the received data from UART 0 to USB.
* Input          : None.
* Return         : none.
*******************************************************************************/
void USART_To_USB_Send_Data(void)
{
    if (linecoding.datatype == 7)
    {
        USART_Rx_Buffer[USART_Rx_ptr_in] = USART_ReceiveData(USART1) & 0x7F;
    }
    else if (linecoding.datatype == 8)
    {
        USART_Rx_Buffer[USART_Rx_ptr_in] = USART_ReceiveData(USART1);
    }

    USART_Rx_ptr_in++;

    /* To avoid buffer overflow */
    if(USART_Rx_ptr_in == USART_RX_DATA_SIZE)
    {
        USART_Rx_ptr_in = 0;
    }
}

