/******************************************************************************
 * @file     micro_printer.c
 * @brief    NUC126 series USBD micro printer sample file
 *
 * @note
 * Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/

#include  "NUC126.h"
#include  "micro_printer.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_WAKEUP)
    {
        /* Clear event flag */
        USBD_CLR_INT_FLAG(USBD_INTSTS_WAKEUP);
    }

//------------------------------------------------------------------
    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;
        }
    }

//------------------------------------------------------------------
    if(u32IntSts & USBD_INTSTS_USB)
    {
        // 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();
        }

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

        if(u32IntSts & USBD_INTSTS_EP3)
        {
            /* Clear event flag */
            USBD_CLR_INT_FLAG(USBD_INTSTS_EP3);
            if(g_u32OutToggle == (USBD->EPSTS & USBD_EPSTS_EPSTS3_Msk))
            {
                USBD_SET_PAYLOAD_LEN(EP3, EP3_MAX_PKT_SIZE);
            }
            else
            {
                // Bulk Out -> receive printer data
                PTR_Data_Receive();
                g_u32OutToggle = USBD->EPSTS & USBD_EPSTS_EPSTS3_Msk;
            }
        }

        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);
        }
    }

}

/*--------------------------------------------------------------------------*/
/**
  * @brief  USBD Endpoint Config.
  * @param  None.
  * @retval None.
  */
void PTR_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 PTR_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_PORT_STATUS:
            {
                /* Data stage */
                USBD_SET_DATA1(EP0);
                USBD_SET_PAYLOAD_LEN(EP0, 0);
                /* Status stage */
                USBD_PrepareCtrlOut(0, 0);
                break;
            }
            default:
            {
                /* Setup error, stall the device */
                USBD_SetStall(0);
                break;
            }
        }
    }
    else
    {
        // Host to device
    }
}

/* Receive printer command and data from host */
void PTR_Data_Receive(void)
{
    uint8_t *pu8Buf = (uint8_t *)(USBD_BUF_BASE + USBD_GET_EP_BUF_ADDR(EP3));
    uint32_t u32Size = USBD_GET_PAYLOAD_LEN(EP3);

    /* trigger next OUT data */
    USBD_SET_PAYLOAD_LEN(EP3, EP3_MAX_PKT_SIZE);
}


/*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/

