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9b2696b848
This way the host can reset the MCU if it's hung (for example, in the panic loop) and we don't need to unplug-replug.
160 lines
3.3 KiB
C
160 lines
3.3 KiB
C
/*
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* fw/usb//usb.h - USB hardware setup and standard device requests
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*
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* Written 2008, 2009, 2011, 2013 by Werner Almesberger
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* Copyright 2008, 2009, 2011, 2013 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef USB_H
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#define USB_H
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#include <stdbool.h>
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#include <stdint.h>
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/*
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* Descriptor types
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*
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* Reuse libusb naming scheme (/usr/include/usb.h)
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*/
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#define USB_DT_DEVICE 1
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#define USB_DT_CONFIG 2
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#define USB_DT_STRING 3
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#define USB_DT_INTERFACE 4
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#define USB_DT_ENDPOINT 5
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/*
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* Device classes
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*
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* Reuse libusb naming scheme (/usr/include/usb.h)
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*/
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#define USB_CLASS_PER_INTERFACE 0xfe
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#define USB_CLASS_VENDOR_SPEC 0xff
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/*
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* Configuration attributes
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*/
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#define USB_ATTR_BUS_POWERED 0x80
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#define USB_ATTR_SELF_POWERED 0x40
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#define USB_ATTR_REMOTE_WAKEUP 0x20
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/*
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* Setup request types
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*/
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#define TO_DEVICE(req) (0x00 | (req) << 8)
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#define FROM_DEVICE(req) (0x80 | (req) << 8)
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#define TO_INTERFACE(req) (0x01 | (req) << 8)
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#define FROM_INTERFACE(req) (0x81 | (req) << 8)
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#define TO_ENDPOINT(req) (0x02 | (req) << 8)
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#define FROM_ENDPOINT(req) (0x82 | (req) << 8)
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/*
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* Setup requests
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*/
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#define GET_STATUS 0x00
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#define CLEAR_FEATURE 0x01
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#define SET_FEATURE 0x03
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#define SET_ADDRESS 0x05
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#define GET_DESCRIPTOR 0x06
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#define SET_DESCRIPTOR 0x07
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#define GET_CONFIGURATION 0x08
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#define SET_CONFIGURATION 0x09
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#define GET_INTERFACE 0x0a
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#define SET_INTERFACE 0x0b
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#define SYNCH_FRAME 0x0c
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/*
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* USB Language ID codes
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*
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* http://www.usb.org/developers/docs/USB_LANGIDs.pdf
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*/
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#define USB_LANGID_ENGLISH_US 0x409
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/*
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* Odd. sdcc seems to think "x" assumes the size of the destination, i.e.,
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* uint8_t. Hence the cast.
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*/
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#define LE(x) ((uint16_t) (x) & 0xff), ((uint16_t) (x) >> 8)
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#define LO(x) (((uint8_t *) &(x))[0])
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#define HI(x) (((uint8_t *) &(x))[1])
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#ifdef LOW_SPEED
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#define EP0_SIZE 8
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#else
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#define EP0_SIZE 64
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#endif
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#define EP1_SIZE 64 /* simplify */
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enum ep_state {
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EP_IDLE,
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EP_RX,
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EP_TX,
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EP_STALL,
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};
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struct ep_descr {
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enum ep_state state;
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uint8_t *buf;
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uint8_t *end;
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uint8_t size;
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void (*callback)(void *user);
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void *user;
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};
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struct setup_request {
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uint8_t bmRequestType;
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uint8_t bRequest;
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uint16_t wValue;
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uint16_t wIndex;
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uint16_t wLength;
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};
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extern const uint8_t device_descriptor[];
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extern const uint8_t config_descriptor[];
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extern struct ep_descr eps[];
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extern bool (*user_setup)(const struct setup_request *setup);
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extern void (*user_set_interface)(int nth);
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extern bool (*user_get_descriptor)(uint8_t type, uint8_t index,
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const uint8_t **reply, uint8_t *size);
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extern void (*user_reset)(void);
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#define usb_left(ep) ((ep)->end-(ep)->buf)
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#define usb_send(ep, buf, size, callback, user) \
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usb_io(ep, EP_TX, (void *) buf, size, callback, user)
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#define usb_recv(ep, buf, size, callback, user) \
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usb_io(ep, EP_RX, buf, size, callback, user)
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void usb_io(struct ep_descr *ep, enum ep_state state, uint8_t *buf,
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uint8_t size, void (*callback)(void *user), void *user);
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bool handle_setup(const struct setup_request *setup);
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void set_addr(uint8_t addr);
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void usb_ep_change(struct ep_descr *ep);
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void usb_reset(void);
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void usb_enable_bus_reset(void);
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void usb_init(void);
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#endif /* !USB_H */
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