mirror of
https://github.com/gdsports/USBHost_t36
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139 lines
3.6 KiB
C++
139 lines
3.6 KiB
C++
/* USB EHCI Host for Teensy 3.6
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* Copyright 2017 Paul Stoffregen (paul@pjrc.com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef USB_HOST_TEENSY36_
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#define USB_HOST_TEENSY36_
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#include <stdint.h>
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typedef struct Device_struct Device_t;
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typedef struct Pipe_struct Pipe_t;
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typedef struct Transfer_struct Transfer_t;
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typedef union {
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struct {
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union {
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struct {
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uint8_t bmRequestType;
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uint8_t bRequest;
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};
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uint16_t wRequestAndType;
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};
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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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struct {
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uint32_t word1;
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uint32_t word2;
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};
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} setup_t;
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struct Device_struct {
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Pipe_t *control_pipe;
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Device_t *next;
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setup_t setup;
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uint8_t speed; // 0=12, 1=1.5, 2=480 Mbit/sec
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uint8_t address;
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uint8_t hub_address;
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uint8_t hub_port;
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uint8_t enum_state;
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uint8_t bDeviceClass;
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uint8_t bDeviceSubClass;
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uint8_t bDeviceProtocol;
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uint16_t idVendor;
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uint16_t idProduct;
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uint16_t LanguageID;
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};
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struct Pipe_struct {
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// Queue Head (QH), EHCI page 46-50
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struct { // must be aligned to 32 byte boundary
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volatile uint32_t horizontal_link;
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volatile uint32_t capabilities[2];
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volatile uint32_t current;
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volatile uint32_t next;
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volatile uint32_t alt_next;
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volatile uint32_t token;
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volatile uint32_t buffer[5];
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} qh;
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Device_t *device;
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uint8_t type; // 0=control, 1=isochronous, 2=bulk, 3=interrupt
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uint8_t direction; // 0=out, 1=in (changes for control, others fixed)
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uint8_t unusedbyte[2];
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void *callback_object; // TODO: C++ callbacks??
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void (*callback_function)(const Transfer_t *);
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};
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struct Transfer_struct {
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// Queue Element Transfer Descriptor (qTD), EHCI pg 40-45
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struct { // must be aligned to 32 byte boundary
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volatile uint32_t next;
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volatile uint32_t alt_next;
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volatile uint32_t token;
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volatile uint32_t buffer[5];
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} qtd;
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// linked list of queued, not-yet-completed transfers
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Transfer_t *next_followup;
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Transfer_t *prev_followup;
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// data to be used by callback function
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Pipe_t *pipe;
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void *buffer;
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uint32_t length;
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uint32_t unused[3];
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};
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void init_Device_Pipe_Transfer_memory(void);
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Device_t * allocate_Device(void);
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void free_Device(Device_t *q);
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Pipe_t * allocate_Pipe(void);
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void free_Pipe(Pipe_t *q);
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Transfer_t * allocate_Transfer(void);
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void free_Transfer(Transfer_t *q);
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class USBHostDriver {
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public:
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virtual bool claim_device(Device_t *device) {
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return false;
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}
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virtual bool claim_interface(Device_t *device) {
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return false;
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}
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virtual void disconnect() {
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}
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};
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class USBHub : public USBHostDriver {
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};
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#endif
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