/****************************************************************************//**
 * @file     vcom_serial.c
 * @version  V0.10
 * @brief    M253 series USBD VCOM sample file
 *
 * SPDX-License-Identifier: Apache-2.0
 * @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/

/*!<Includes */
#include <string.h>
#include "NuMicro.h"
#include "vcom_serial.h"

uint32_t volatile g_u32OutToggle = 0;
uint8_t volatile g_u8Suspend = 0;

/*--------------------------------------------------------------------------*/
void USBD_IRQHandler(void)
{
    uint32_t u32IntSts = USBD_GET_INT_FLAG();
    uint32_t u32State = USBD_GET_BUS_STATE();

    //------------------------------------------------------------------
    if (u32IntSts & USBD_INTSTS_FLDET)
    {
        // Floating detect
        USBD_CLR_INT_FLAG(USBD_INTSTS_FLDET);

        if (USBD_IS_ATTACHED())
        {
            /* USB Plug In */
            USBD_ENABLE_USB();
        }
        else
        {
            /* USB Un-plug */
            USBD_DISABLE_USB();
        }
    }

    //------------------------------------------------------------------
    if (u32IntSts & USBD_INTSTS_BUS)
    {
        /* Clear event flag */
        USBD_CLR_INT_FLAG(USBD_INTSTS_BUS);

        if (u32State & USBD_STATE_USBRST)
        {
            /* Bus reset */
            USBD_ENABLE_USB();
            USBD_SwReset();
            g_u32OutToggle = 0;
            g_u8Suspend = 0;
        }

        if (u32State & USBD_STATE_SUSPEND)
        {
            /* Enter power down to wait USB attached */
            g_u8Suspend = 1;

            /* Enable USB but disable PHY */
            USBD_DISABLE_PHY();
        }

        if (u32State & USBD_STATE_RESUME)
        {
            /* Enable USB and enable PHY */
            USBD_ENABLE_USB();

            g_u8Suspend = 0;
        }

#ifdef SUPPORT_LPM

        if (u32State & USBD_STATE_L1SUSPEND)
        {
            /*
               TODO: Implement LPM SUSPEND flag here.
                     Recommend implementing the power-saving function in main loop.
            */
        }

        if (u32State & USBD_STATE_L1RESUME)
        {
            /*
               TODO: Implement LPM RESUME flag here.
            */
        }

#endif

    }

    if (u32IntSts & USBD_INTSTS_NEVWKIF_Msk)
    {
        /*Clear no-event wake up interrupt */
        USBD_CLR_INT_FLAG(USBD_INTSTS_NEVWKIF_Msk);
        /*
           TODO: Implement the function that will be executed when device is woken by non-USB event.
        */
    }

    //------------------------------------------------------------------
    if (u32IntSts & USBD_INTSTS_USB)
    {
        extern uint8_t g_USBD_au8SetupPacket[];

        // USB event
        if (u32IntSts & USBD_INTSTS_SETUP)
        {
            // Setup packet
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_SETUP);

            /* Clear the data IN/OUT ready flag of control end-points */
            USBD_STOP_TRANSACTION(EP0);
            USBD_STOP_TRANSACTION(EP1);

            USBD_ProcessSetupPacket();
        }

        // EP events
        if (u32IntSts & USBD_INTSTS_EP0)
        {

            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP0);

            // control IN
            USBD_CtrlIn();
        }

        if (u32IntSts & USBD_INTSTS_EP1)
        {

            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP1);

            // control OUT
            USBD_CtrlOut();

            // In ACK of SET_LINE_CODE
            if (g_USBD_au8SetupPacket[1] == SET_LINE_CODE)
            {
                if (g_USBD_au8SetupPacket[4] == 0) /* VCOM-1 */
                    VCOM_LineCoding(); /* Apply UART settings */
            }

        }

        if (u32IntSts & USBD_INTSTS_EP2)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP2);
            // Bulk IN
            EP2_Handler();
        }

        if (u32IntSts & USBD_INTSTS_EP3)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP3);
            // Bulk Out
            EP3_Handler();
        }

        if (u32IntSts & USBD_INTSTS_EP4)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP4);
        }

        if (u32IntSts & USBD_INTSTS_EP5)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP5);
        }

        if (u32IntSts & USBD_INTSTS_EP6)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP6);
        }

        if (u32IntSts & USBD_INTSTS_EP7)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP7);
        }

        if (u32IntSts & USBD_INTSTS_EP8)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP8);
        }

        if (u32IntSts & USBD_INTSTS_EP9)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP9);
        }

        if (u32IntSts & USBD_INTSTS_EP10)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP10);
        }

        if (u32IntSts & USBD_INTSTS_EP11)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP11);
        }
    }
}

void EP2_Handler(void)
{
    g_u32TxSize = 0;
}


void EP3_Handler(void)
{
    /* Bulk OUT */
    if (g_u32OutToggle == (USBD->EPSTS0 & USBD_EPSTS0_EPSTS3_Msk))
    {
        USBD_SET_PAYLOAD_LEN(EP3, EP3_MAX_PKT_SIZE);
    }
    else
    {
        g_u32RxSize = USBD_GET_PAYLOAD_LEN(EP3);
        g_pu8RxBuf = (uint8_t *)(USBD_BUF_BASE + USBD_GET_EP_BUF_ADDR(EP3));

        g_u32OutToggle = USBD->EPSTS0 & USBD_EPSTS0_EPSTS3_Msk;
        /* Set a flag to indicate bulk out ready */
        g_i8BulkOutReady = 1;
    }
}




/*--------------------------------------------------------------------------*/
/**
  * @brief  USBD Endpoint Config.
  * @param  None.
  * @retval None.
  */
void VCOM_Init(void)
{
    /* Init setup packet buffer */
    /* Buffer for setup packet -> [0 ~ 0x7] */
    USBD->STBUFSEG = SETUP_BUF_BASE;

    /*****************************************************/
    /* EP0 ==> control IN endpoint, address 0 */
    USBD_CONFIG_EP(EP0, USBD_CFG_CSTALL | USBD_CFG_EPMODE_IN | 0);
    /* Buffer range for EP0 */
    USBD_SET_EP_BUF_ADDR(EP0, EP0_BUF_BASE);

    /* EP1 ==> control OUT endpoint, address 0 */
    USBD_CONFIG_EP(EP1, USBD_CFG_CSTALL | USBD_CFG_EPMODE_OUT | 0);
    /* Buffer range for EP1 */
    USBD_SET_EP_BUF_ADDR(EP1, EP1_BUF_BASE);

    /*****************************************************/
    /* EP2 ==> Bulk IN endpoint, address 1 */
    USBD_CONFIG_EP(EP2, USBD_CFG_EPMODE_IN | BULK_IN_EP_NUM);
    /* Buffer offset for EP2 */
    USBD_SET_EP_BUF_ADDR(EP2, EP2_BUF_BASE);

    /* EP3 ==> Bulk Out endpoint, address 2 */
    USBD_CONFIG_EP(EP3, USBD_CFG_EPMODE_OUT | BULK_OUT_EP_NUM);
    /* Buffer offset for EP3 */
    USBD_SET_EP_BUF_ADDR(EP3, EP3_BUF_BASE);
    /* trigger receive OUT data */
    USBD_SET_PAYLOAD_LEN(EP3, EP3_MAX_PKT_SIZE);

    /* EP4 ==> Interrupt IN endpoint, address 3 */
    USBD_CONFIG_EP(EP4, USBD_CFG_EPMODE_IN | INT_IN_EP_NUM);
    /* Buffer offset for EP4 ->  */
    USBD_SET_EP_BUF_ADDR(EP4, EP4_BUF_BASE);
}


void VCOM_ClassRequest(void)
{
    uint8_t buf[8];

    USBD_GetSetupPacket(buf);

    if (buf[0] & 0x80)   /* request data transfer direction */
    {
        // Device to host
        switch (buf[1])
        {
            case GET_LINE_CODE:
            {
                if (buf[4] == 0)   /* VCOM-1 */
                {
                    USBD_MemCopy((uint8_t *)(USBD_BUF_BASE + USBD_GET_EP_BUF_ADDR(EP0)), (uint8_t *)&g_sLineCoding, 7);
                }

                /* Data stage */
                USBD_SET_DATA1(EP0);
                USBD_SET_PAYLOAD_LEN(EP0, 7);
                /* Status stage */
                USBD_PrepareCtrlOut(0, 0);
                break;
            }

            default:
            {
                /* Setup error, stall the device */
                USBD_SetStall(EP0);
                USBD_SetStall(EP1);
                break;
            }
        }
    }
    else
    {
        // Host to device
        switch (buf[1])
        {
            case SET_CONTROL_LINE_STATE:
            {
                if (buf[4] == 0)   /* VCOM-1 */
                {
                    g_u16CtrlSignal = buf[3];
                    g_u16CtrlSignal = (g_u16CtrlSignal << 8) | buf[2];
                    //printf("RTS=%d  DTR=%d\n", (gCtrlSignal0 >> 1) & 1, gCtrlSignal0 & 1);
                }

                /* Status stage */
                USBD_SET_DATA1(EP0);
                USBD_SET_PAYLOAD_LEN(EP0, 0);
                break;
            }

            case SET_LINE_CODE:
            {
                if (buf[4] == 0) /* VCOM-1 */
                    USBD_PrepareCtrlOut((uint8_t *)&g_sLineCoding, 7);

                /* Status stage */
                USBD_SET_DATA1(EP0);
                USBD_SET_PAYLOAD_LEN(EP0, 0);

                break;
            }

            default:
            {
                // Stall
                /* Setup error, stall the device */
                USBD_SetStall(EP0);
                USBD_SetStall(EP1);
                break;
            }
        }
    }
}

void VCOM_LineCoding(void)
{
    uint32_t u32Reg;
    uint32_t u32Baud_Div;

    NVIC_DisableIRQ(UART4_IRQn);
    // Reset software FIFO
    g_u16ComRbytes = 0;
    g_u16ComRhead = 0;
    g_u16ComRtail = 0;

    g_u16ComTbytes = 0;
    g_u16ComThead = 0;
    g_u16ComTtail = 0;

    // Reset hardware FIFO
    UART4->FIFO = UART_FIFO_RXRST_Msk | UART_FIFO_TXRST_Msk;

    // Set baudrate
    u32Baud_Div = UART_BAUD_MODE2_DIVIDER(__HIRC, g_sLineCoding.u32DTERate);

    if (u32Baud_Div > 0xFFFF)
        UART4->BAUD = (UART_BAUD_MODE0 | UART_BAUD_MODE0_DIVIDER(__HIRC, g_sLineCoding.u32DTERate));
    else
        UART4->BAUD = (UART_BAUD_MODE2 | u32Baud_Div);

    // Set parity
    if (g_sLineCoding.u8ParityType == 0)
        u32Reg = 0; // none parity
    else if (g_sLineCoding.u8ParityType == 1)
        u32Reg = 0x08; // odd parity
    else if (g_sLineCoding.u8ParityType == 2)
        u32Reg = 0x18; // even parity
    else
        u32Reg = 0;

    // bit width
    switch (g_sLineCoding.u8DataBits)
    {
        case 5:
            u32Reg |= 0;
            break;

        case 6:
            u32Reg |= 1;
            break;

        case 7:
            u32Reg |= 2;
            break;

        case 8:
            u32Reg |= 3;
            break;

        default:
            break;
    }

    // stop bit
    if (g_sLineCoding.u8CharFormat > 0)
        u32Reg |= 0x4; // 2 or 1.5 bits

    UART4->LINE = u32Reg;

    // Re-enable UART interrupt
    NVIC_EnableIRQ(UART4_IRQn);
}






