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Begin FTDI serial driver

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PaulStoffregen 2017-10-12 20:06:59 -07:00
parent 0e35681c48
commit ac06c74291
2 changed files with 316 additions and 0 deletions
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44
USBHost_t36.h
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@ -744,6 +744,50 @@ private:
}; };
class USBSerial: public USBDriver, public Stream {
public:
enum { BUFFER_SIZE = 4200 }; // must hold at least 6 max size packets, plus 2 extra bytes
USBSerial(USBHost &host) { init(); }
void begin(uint32_t baud, uint32_t format=0);
void end(void);
virtual int available(void);
virtual int peek(void);
virtual int read(void);
virtual size_t write(uint8_t c);
protected:
virtual bool claim(Device_t *device, int type, const uint8_t *descriptors, uint32_t len);
virtual void disconnect();
private:
static void rx_callback(const Transfer_t *transfer);
static void tx_callback(const Transfer_t *transfer);
void rx_data(const Transfer_t *transfer);
void tx_data(const Transfer_t *transfer);
void init();
static bool check_rxtx_ep(uint32_t &rxep, uint32_t &txep);
bool init_buffers(uint32_t rsize, uint32_t tsize);
private:
Pipe_t mypipes[3] __attribute__ ((aligned(32)));
Transfer_t mytransfers[7] __attribute__ ((aligned(32)));
uint32_t bigbuffer[(BUFFER_SIZE+3)/4];
Pipe_t *rxpipe;
Pipe_t *txpipe;
uint8_t *rx1; // location for first incoming packet
uint8_t *rx2; // location for second incoming packet
uint8_t *rxbuf; // receive circular buffer
uint16_t rxhead;// receive head
uint16_t rxtail;// receive tail
uint8_t *tx1; // location for first outgoing packet
uint8_t *tx2; // location for second outgoing packet
uint8_t *txbuf;
uint16_t txhead;
uint16_t txtail;
uint16_t rxsize;// size of receive circular buffer
uint16_t txsize;// size of transmit circular buffer
uint8_t rxstate;// bitmask: which receive packets are queued
bool ignore_first_two_bytes;
};
class MouseController : public USBHIDInput { class MouseController : public USBHIDInput {
public: public:
MouseController(USBHost &host) { USBHIDParser::driver_ready_for_hid_collection(this); } MouseController(USBHost &host) { USBHIDParser::driver_ready_for_hid_collection(this); }

272
serial.cpp Normal file
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@ -0,0 +1,272 @@
/* USB EHCI Host for Teensy 3.6
* Copyright 2017 Paul Stoffregen (paul@pjrc.com)
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <Arduino.h>
#include "USBHost_t36.h" // Read this header first for key info
// quick hack - ultimately USBHost print & println need to be renamed
#define print USBHost::print
#define println USBHost::println
void USBSerial::init()
{
contribute_Pipes(mypipes, sizeof(mypipes)/sizeof(Pipe_t));
contribute_Transfers(mytransfers, sizeof(mytransfers)/sizeof(Transfer_t));
driver_ready_for_device(this);
}
bool USBSerial::claim(Device_t *dev, int type, const uint8_t *descriptors, uint32_t len)
{
// only claim at interface level
println("USBSerial claim this=", (uint32_t)this, HEX);
print("vid=", dev->idVendor, HEX);
println(", pid=", dev->idProduct, HEX);
if (type == 0) {
if (dev->idVendor == 0x0403 && dev->idProduct == 0x6001) {
// FTDI FT232
println("len = ", len);
if (len < 23) return false;
if (descriptors[0] != 9) return false; // length 9
if (descriptors[9] != 7) return false; // length 7
if (descriptors[10] != 5) return false; // ep desc
uint32_t rxep = descriptors[11];
if (descriptors[12] != 2) return false; // bulk type
if (descriptors[13] != 64) return false; // size 64
if (descriptors[14] != 0) return false;
if (descriptors[16] != 7) return false; // length 7
if (descriptors[17] != 5) return false; // ep desc
uint32_t txep = descriptors[18];
if (descriptors[19] != 2) return false; // bulk type
if (descriptors[20] != 64) return false; // size 64
if (descriptors[21] != 0) return false;
if (!check_rxtx_ep(rxep, txep)) return false;
print("FTDI, rxep=", rxep & 15);
println(", txep=", txep);
if (!init_buffers(64, 64)) return false;
rxpipe = new_Pipe(dev, 2, rxep & 15, 1, 64);
if (!rxpipe) return false;
txpipe = new_Pipe(dev, 2, txep, 0, 64);
if (!txpipe) {
// TODO: free rxpipe
return false;
}
ignore_first_two_bytes = true;
rxpipe->callback_function = rx_callback;
queue_Data_Transfer(rxpipe, rx1, 64, this);
rxstate = 1;
if (rxsize > 128) {
queue_Data_Transfer(rxpipe, rx2, 64, this);
rxstate = 3;
}
txpipe->callback_function = tx_callback;
return true;
}
}
return false;
}
// check if two legal endpoints, 1 receive & 1 transmit
bool USBSerial::check_rxtx_ep(uint32_t &rxep, uint32_t &txep)
{
if ((rxep & 0x0F) == 0) return false;
if ((txep & 0x0F) == 0) return false;
uint32_t rxdir = rxep & 0xF0;
uint32_t txdir = txep & 0xF0;
if (rxdir == 0x80 && txdir == 0x00) {
return true;
}
if (rxdir == 0x00 && txdir == 0x80) {
std::swap(rxep, txep);
return true;
}
return false;
}
// initialize buffer sizes and pointers
bool USBSerial::init_buffers(uint32_t rsize, uint32_t tsize)
{
// buffer must be able to hold 2 of each packet, plus have room to
if (sizeof(bigbuffer) < (rsize + tsize) * 3 + 2) return false;
rx1 = (uint8_t *)bigbuffer;
rx2 = rx1 + rsize;
tx1 = rx2 + rsize;
tx2 = tx1 + tsize;
rxbuf = tx2 + tsize;
// FIXME: this assume 50-50 split - not true when rsize != tsize
rxsize = (sizeof(bigbuffer) - (rsize + tsize) * 2) / 2;
txsize = rxsize;
txbuf = rxbuf + rxsize;
rxhead = 0;
rxtail = 0;
txhead = 0;
txtail = 0;
rxstate = 0;
return true;
}
void USBSerial::rx_callback(const Transfer_t *transfer)
{
if (!transfer->driver) return;
((USBSerial *)(transfer->driver))->rx_data(transfer);
}
void USBSerial::tx_callback(const Transfer_t *transfer)
{
if (!transfer->driver) return;
((USBSerial *)(transfer->driver))->tx_data(transfer);
}
void USBSerial::rx_data(const Transfer_t *transfer)
{
uint32_t len = transfer->length - ((transfer->qtd.token >> 16) & 0x7FFF);
print("rx: ");
print_hexbytes(transfer->buffer, len);
// first update rxstate bitmask
if (transfer->buffer == rx1) {
rxstate &= 0xFE;
} else if (transfer->buffer == rx2) {
rxstate &= 0xFD;
}
// get start of data and actual length
const uint8_t *p = (const uint8_t *)transfer->buffer;
if (ignore_first_two_bytes) {
if (len >= 2) {
p += 2;
len -= 2;
} else {
len = 0;
}
}
// copy data from packet buffer to circular buffer
if (len > 0) {
// TODO: copy to buffer
}
// re-queue packet buffer(s) if possible
uint32_t avail;
uint32_t head = rxhead;
uint32_t tail = rxtail;
if (head >= tail) {
avail = rxsize - 1 + (tail - head);
} else {
avail = (tail - head) - 1;
}
uint32_t packetsize = rx2 - rx1;
if (avail >= packetsize) {
if ((rxstate & 0x01) == 0) {
queue_Data_Transfer(rxpipe, rx1, packetsize, this);
rxstate |= 0x01;
} else if ((rxstate & 0x02) == 0) {
queue_Data_Transfer(rxpipe, rx2, packetsize, this);
rxstate |= 0x02;
}
if ((rxstate & 0x03) != 0x03 && avail >= packetsize * 2) {
if ((rxstate & 0x01) == 0) {
queue_Data_Transfer(rxpipe, rx1, packetsize, this);
rxstate |= 0x01;
} else if ((rxstate & 0x02) == 0) {
queue_Data_Transfer(rxpipe, rx2, packetsize, this);
rxstate |= 0x02;
}
}
}
}
void USBSerial::tx_data(const Transfer_t *transfer)
{
println("tx: ");
}
void USBSerial::begin(uint32_t baud, uint32_t format)
{
}
void USBSerial::end(void)
{
}
int USBSerial::available(void)
{
return 0;
}
int USBSerial::peek(void)
{
return -1;
}
int USBSerial::read(void)
{
return -1;
}
size_t USBSerial::write(uint8_t c)
{
return 1;
}
void USBSerial::disconnect()
{
}