/******************************************************************************
 * @file     hid_transfer.c
 * @version  V3.00
 * @brief    USBD HID transfer sample file.
 *
 * @copyright SPDX-License-Identifier: Apache-2.0
 * @copyright Copyright (C) 2021 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/

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

uint8_t volatile g_u8Suspend = 0;
static uint8_t s_u8Idle = 0, s_u8Protocol = 0;

void USBD_IRQHandler(void);

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_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(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);
        }
    }
}

/*--------------------------------------------------------------------------*/
/**
  * @brief  USBD Endpoint Config.
  * @param  None.
  * @retval None.
  */
void HID_Init(void)
{
    /* Init setup packet buffer */
    /* Buffer range 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 ==> Interrupt IN endpoint, address 1 */
    USBD_CONFIG_EP(EP2, USBD_CFG_EPMODE_IN | INT_IN_EP_NUM);
    /* Buffer range for EP2 */
    USBD_SET_EP_BUF_ADDR(EP2, EP2_BUF_BASE);

    /* EP3 ==> Interrupt OUT endpoint, address 2 */
    USBD_CONFIG_EP(EP3, USBD_CFG_EPMODE_OUT | INT_OUT_EP_NUM);
    /* Buffer range for EP3 */
    USBD_SET_EP_BUF_ADDR(EP3, EP3_BUF_BASE);
}

void HID_ClassRequest(void)
{
    uint8_t au8Buf[8];
    uint8_t au8SendBuffer[64], u8SendLen;
    uint8_t i;

    USBD_GetSetupPacket(au8Buf);

    if(au8Buf[0] & 0x80)     /* request data transfer direction */
    {
        // Device to host
        switch(au8Buf[1])
        {
            case GET_REPORT:
            {
                // Control IN : Send Report
                for(i = 0; i < 64; i++)
                    au8SendBuffer[i] = 64 - i;
                u8SendLen = 64;

                USBD_MemCopy((uint8_t *)(USBD_BUF_BASE + USBD_GET_EP_BUF_ADDR(EP0)), (uint8_t *)&au8SendBuffer, u8SendLen);

                /* Data stage */
                USBD_PrepareCtrlIn((uint8_t *)au8SendBuffer, u8SendLen);
                /* Status stage */
                USBD_PrepareCtrlOut(0, 0);

                break;
            }
            case GET_IDLE:
            {
                USBD_SET_PAYLOAD_LEN(EP1, au8Buf[6]);
                /* Data stage */
                USBD_PrepareCtrlIn(&s_u8Idle, au8Buf[6]);
                /* Status stage */
                USBD_PrepareCtrlOut(0, 0);
                break;
            }
            case GET_PROTOCOL:
            {
                USBD_SET_PAYLOAD_LEN(EP1, au8Buf[6]);
                /* Data stage */
                USBD_PrepareCtrlIn(&s_u8Protocol, au8Buf[6]);
                /* 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(au8Buf[1])
        {
            case SET_REPORT:
            {
                if(au8Buf[3] == 3)
                {
                    /* Request Type = Feature */
                    USBD_SET_DATA1(EP1);
                    USBD_SET_PAYLOAD_LEN(EP1, 0);
                }
                else
                {
                    // Control OUT : Receive Report

                    /* Request Type = INPUT */
                    USBD_SET_DATA1(EP1);
                    USBD_SET_PAYLOAD_LEN(EP1, au8Buf[6]);

                    /* Status stage */
                    USBD_PrepareCtrlIn(0, 0);
                }
                break;
            }
            case SET_IDLE:
            {
                s_u8Idle = au8Buf[3];
                /* Status stage */
                USBD_SET_DATA1(EP0);
                USBD_SET_PAYLOAD_LEN(EP0, 0);
                break;
            }
            case SET_PROTOCOL:
            {
                s_u8Protocol = au8Buf[2];
                /* 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;
            }
        }
    }
}
