/*
 * Copyright (c) 2003 Bernd Walter
 * All rights reserved.
 */

/*  Example Source Code for USB Enumeration using a PDIUSBD11 connected to a PIC16F87x
 *  Copyright 2001 Craig Peacock, Craig.Peacock@beyondlogic.org
 *  31th December 2001 http://www.beyondlogic.org            				      
 */

typedef struct {
    uint8_t bmRequestType;
    uint8_t bRequest;
    uint16_t wValue;
    uint16_t wIndex;
    uint16_t wLength;
}  __attribute__ ((packed)) USB_SETUP_REQUEST;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;
    uint16_t bcdUSB;
    uint8_t bDeviceClass;
    uint8_t bDeviceSubClass;
    uint8_t bDeviceProtocol;
    uint8_t bMaxPacketSize0;
    uint16_t idVendor;
    uint16_t idProduct;
    uint16_t bcdDevice;
    uint8_t iManufacturer;
    uint8_t iProduct;
    uint8_t iSerialNumber;
    uint8_t bNumConfigurations;
} __attribute__ ((packed))  USB_DEVICE_DESCRIPTOR;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;
    uint8_t bEndpointAddress;
    uint8_t bmAttributes;
    uint16_t wMaxPacketSize;
    uint8_t bInterval;
} __attribute__ ((packed))  USB_ENDPOINT_DESCRIPTOR;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;
    uint16_t wTotalLength;
    uint8_t bNumInterfaces;
    uint8_t bConfigurationValue;
    uint8_t iConfiguration;
    uint8_t bmAttributes;
    uint8_t MaxPower;
} __attribute__ ((packed))  USB_CONFIGURATION_DESCRIPTOR;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;
    uint8_t bInterfaceNumber;
    uint8_t bAlternateSetting;
    uint8_t bNumEndpoints;
    uint8_t bInterfaceClass;
    uint8_t bInterfaceSubClass;
    uint8_t bInterfaceProtocol;
    uint8_t iInterface;
} __attribute__ ((packed))  USB_INTERFACE_DESCRIPTOR;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;
    uint16_t wHIDClassSpecComp;
    uint8_t bCountry;
    uint8_t bNumDescriptors;
    uint8_t b1stDescType;
    uint16_t w1stDescLength;
} __attribute__ ((packed))  USB_HID_DESCRIPTOR;

typedef struct {
    USB_CONFIGURATION_DESCRIPTOR ConfigDescriptor;
    USB_INTERFACE_DESCRIPTOR InterfaceDescriptor0;
    USB_ENDPOINT_DESCRIPTOR EndpointDescriptor00;
    USB_ENDPOINT_DESCRIPTOR EndpointDescriptor01;
    USB_INTERFACE_DESCRIPTOR InterfaceDescriptor1;
    USB_ENDPOINT_DESCRIPTOR EndpointDescriptor10;
    USB_ENDPOINT_DESCRIPTOR EndpointDescriptor11;
} __attribute__ ((packed))  USB_CONFIG_DATA;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;
    char     bString[];
} __attribute__ ((packed))  STRING_DESCRIPTOR;

typedef struct {
    uint8_t bLength;
    uint8_t bDescriptorType;
    uint16_t wLANGID0;
} __attribute__ ((packed))  LANGID_DESCRIPTOR;

#define D12_SET_ADDRESS_ENABLE		0xD0
#define D12_SET_ENDPOINT_ENABLE  	0xD8
#define D12_SET_MODE			0xF3
#define D12_SET_DMA			0xFB
#define D12_READ_INTERRUPT_REGISTER 	0xF4
#define D12_READ_BUFFER			0xF0
#define D12_WRITE_BUFFER		0xF0
#define D12_ACK_SETUP			0xF1
#define D12_CLEAR_BUFFER		0xF2
#define D12_VALIDATE_BUFFER		0xFA
#define D12_READ_LAST_TRANSACTION	0x40
#define D12_SET_ENDPOINT_STATUS		0x40
#define D12_READ_ENDPOINT_STATUS	0x80

#define D12_ENDPOINT_EP0_OUT 		0x00
#define D12_ENDPOINT_EP0_IN 		0x01
#define D12_ENDPOINT_EP1_OUT 		0x02
#define D12_ENDPOINT_EP1_IN 		0x03
#define D12_ENDPOINT_EP2_OUT 		0x04
#define D12_ENDPOINT_EP2_IN 		0x05

#define D12_INT_EP0_OUT			0x01
#define D12_INT_EP0_IN			0x02
#define D12_INT_EP1_OUT			0x04
#define D12_INT_EP1_IN			0x08
#define D12_INT_EP2_OUT			0x10
#define D12_INT_EP2_IN			0x20
#define D12_INT_BUS_RESET		0x40
#define D12_INT_SUSPEND			0x80

#define D12_LAST_TRAN_OK		0x01
#define D12_LAST_TRAN_ERRMSK		0x1e
#define D12_LAST_TRAN_SETUP		0x20
#define D12_LAST_TRAN_DATA		0x40
#define D12_LAST_TRAN_OFLOW		0x80

#define STANDARD_DEVICE_REQUEST		0x00
#define STANDARD_INTERFACE_REQUEST	0x01
#define STANDARD_ENDPOINT_REQUEST	0x02
#define VENDOR_DEVICE_REQUEST		0x40
#define VENDOR_INTERFACE_REQUEST	0x41
#define VENDOR_ENDPOINT_REQUEST		0x42

#define GET_STATUS  			0
#define CLEAR_FEATURE     		1
#define SET_FEATURE                 	3
#define SET_ADDRESS                 	5
#define GET_DESCRIPTOR              	6
#define SET_DESCRIPTOR              	7
#define GET_CONFIGURATION           	8
#define SET_CONFIGURATION           	9
#define GET_INTERFACE               	10
#define SET_INTERFACE               	11
#define SYNCH_FRAME                 	12

#define VENDOR_DOTEMP			125
#define VENDOR_UPDATE			126
#define VENDOR_RESET			127

#define	ENDPOINT_HALT			0

#define TYPE_DEVICE_DESCRIPTOR          1
#define TYPE_CONFIGURATION_DESCRIPTOR   2
#define TYPE_STRING_DESCRIPTOR          3
#define TYPE_INTERFACE_DESCRIPTOR       4
#define TYPE_ENDPOINT_DESCRIPTOR        5
#define TYPE_HID_DESCRIPTOR		0x21

#define USB_ENDPOINT_TYPE_CONTROL	0x00
#define USB_ENDPOINT_TYPE_ISOCHRONOUS	0x01
#define USB_ENDPOINT_TYPE_BULK		0x02
#define USB_ENDPOINT_TYPE_INTERRUPT	0x03

/* Function prototypes */
uint8_t		d12_get_data(void);
void		d12_set_data(uint8_t data);
void		d12_set_cmd(uint8_t cmd);
void		d12_write_cmd(uint8_t command, const uint8_t *buffer, uint8_t count);
void		d12_read_cmd(uint8_t command, uint8_t *buffer, uint8_t count);
uint8_t		d12_read_endpt(uint8_t endpt, uint8_t *buffer);

void		d12_ep0_irq(void);
void		d12_handle_setup(void);
void		d12_getdescriptor(USB_SETUP_REQUEST *setuppkt);
void		d12_stallendpt(uint8_t ep);
uint8_t		d12_read_endpt(uint8_t endpt, uint8_t *buffer);
void		d12_write_endpt(uint8_t endpt, const uint8_t *buffer, uint8_t bytes);
void		d12_send_data_ep0(void);
void		d12_receive_data_ep1(void);
void		d12_send_data_ep2(void);
void		d12_receive_data_ep2(void);

static void	reset(void);

void		usb_init(void);
void		usb_intr(void);
void		usb_gendata(void);