#include "usbd_conf.h"
#include "usbd_core.h"

#define USBD_VID              0x0C72
#define USBD_PID_FS           0x000C
#define USBD_LANGID_STRING    1033
#define USBD_MAX_STR_DESC_SIZ 0x100U

uint8_t *USBD_FS_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_FS_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_FS_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_FS_ProductStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_FS_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_FS_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
uint8_t *USBD_FS_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);

__ALIGN_BEGIN uint8_t USBD_FS_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END = {
    0x12,                 /*bLength */
    USB_DESC_TYPE_DEVICE, /*bDescriptorType*/
    0x00,                 /*bcdUSB */
    0x01,
    0x00,                /*bDeviceClass*/
    0x00,                /*bDeviceSubClass*/
    0x00,                /*bDeviceProtocol*/
    USB_MAX_EP0_SIZE,    /*bMaxPacketSize*/
    LOBYTE(USBD_VID),    /*idVendor*/
    HIBYTE(USBD_VID),    /*idVendor*/
    LOBYTE(USBD_PID_FS), /*idProduct*/
    HIBYTE(USBD_PID_FS), /*idProduct*/
    0xff,                /*bcdDevice*/
    0x54,
    10,                        /*Index of manufacturer  string*/
    4,                         /*Index of product string*/
    0,                         /*Index of serial number string*/
    USBD_MAX_NUM_CONFIGURATION /*bNumConfigurations*/
};

__ALIGN_BEGIN uint8_t USBD_LangIDDesc[USB_LEN_LANGID_STR_DESC] __ALIGN_END = { USB_LEN_LANGID_STR_DESC,
                                                                               USB_DESC_TYPE_STRING,
                                                                               LOBYTE(USBD_LANGID_STRING),
                                                                               HIBYTE(USBD_LANGID_STRING) };

uint8_t *USBD_FS_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
    UNUSED(speed);
    *length = sizeof(USBD_FS_DeviceDesc);
    return USBD_FS_DeviceDesc;
}

uint8_t *USBD_FS_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
    UNUSED(speed);
    *length = sizeof(USBD_LangIDDesc);
    return USBD_LangIDDesc;
}

/* must be here: 1, 2 */
uint8_t *USBD_FS_HugeStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
    UNUSED(speed);
    /* little hack to save some flash memory */
    __ALIGN_BEGIN static const uint16_t huge_descriptor[1 /*+126*/] __ALIGN_END = { 0x03FE };
    *length                                                                     = sizeof(huge_descriptor);
    return (uint8_t *)huge_descriptor;
}

uint8_t *USBD_FS_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{
    UNUSED(speed);

    __ALIGN_BEGIN static const uint16_t cfg_descriptor[1 + 8] __ALIGN_END = { 0x0312, 'P', 'C', 'A', 'N', '-', 'U', 'S', 'B' };
    *length                                                               = sizeof(cfg_descriptor);
    return (uint8_t *)cfg_descriptor;
}

USBD_DescriptorsTypeDef FS_Desc = {
    .GetDeviceDescriptor           = USBD_FS_DeviceDescriptor,
    .GetLangIDStrDescriptor        = USBD_FS_LangIDStrDescriptor,
    .GetManufacturerStrDescriptor  = USBD_FS_HugeStrDescriptor,
    .GetProductStrDescriptor       = USBD_FS_HugeStrDescriptor,
    .GetSerialStrDescriptor        = 0,
    .GetConfigurationStrDescriptor = USBD_FS_ConfigStrDescriptor,
    .GetInterfaceStrDescriptor     = 0,
};