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https://github.com/gdsports/USBHost_t36
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FTDI serial config & receive (still work in progress)
This commit is contained in:
PaulStoffregen
parent
ac06c74291
commit
2b8ca63069
@ -753,9 +753,11 @@ public:
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virtual int available(void);
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virtual int peek(void);
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virtual int read(void);
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virtual int availableForWrite();
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virtual size_t write(uint8_t c);
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protected:
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virtual bool claim(Device_t *device, int type, const uint8_t *descriptors, uint32_t len);
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virtual void control(const Transfer_t *transfer);
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virtual void disconnect();
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private:
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static void rx_callback(const Transfer_t *transfer);
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@ -769,22 +771,27 @@ private:
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Pipe_t mypipes[3] __attribute__ ((aligned(32)));
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Transfer_t mytransfers[7] __attribute__ ((aligned(32)));
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uint32_t bigbuffer[(BUFFER_SIZE+3)/4];
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setup_t setup;
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uint8_t setupdata[8];
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uint32_t baudrate;
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Pipe_t *rxpipe;
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Pipe_t *txpipe;
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uint8_t *rx1; // location for first incoming packet
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uint8_t *rx2; // location for second incoming packet
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uint8_t *rxbuf; // receive circular buffer
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uint16_t rxhead;// receive head
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uint16_t rxtail;// receive tail
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uint8_t *tx1; // location for first outgoing packet
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uint8_t *tx2; // location for second outgoing packet
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uint8_t *txbuf;
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uint16_t txhead;
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uint16_t txtail;
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volatile uint16_t rxhead;// receive head
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volatile uint16_t rxtail;// receive tail
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volatile uint16_t txhead;
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volatile uint16_t txtail;
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uint16_t rxsize;// size of receive circular buffer
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uint16_t txsize;// size of transmit circular buffer
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uint8_t rxstate;// bitmask: which receive packets are queued
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bool ignore_first_two_bytes;
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volatile uint8_t rxstate;// bitmask: which receive packets are queued
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volatile uint8_t txstate;
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uint8_t pending_control;
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enum { CDCACM, FTDI, PL2303, CH341 } sertype;
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};
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120
serial.cpp
120
serial.cpp
@ -70,7 +70,7 @@ bool USBSerial::claim(Device_t *dev, int type, const uint8_t *descriptors, uint3
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// TODO: free rxpipe
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return false;
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}
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ignore_first_two_bytes = true;
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sertype = FTDI;
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rxpipe->callback_function = rx_callback;
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queue_Data_Transfer(rxpipe, rx1, 64, this);
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rxstate = 1;
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@ -79,6 +79,10 @@ bool USBSerial::claim(Device_t *dev, int type, const uint8_t *descriptors, uint3
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rxstate = 3;
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}
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txpipe->callback_function = tx_callback;
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baudrate = 115200;
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pending_control = 0x0F;
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mk_setup(setup, 0x40, 0, 0, 0, 0); // reset port
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queue_Control_Transfer(dev, &setup, NULL, this);
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return true;
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}
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}
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@ -124,11 +128,48 @@ bool USBSerial::init_buffers(uint32_t rsize, uint32_t tsize)
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return true;
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}
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void USBSerial::disconnect()
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{
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}
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void USBSerial::control(const Transfer_t *transfer)
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{
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println("control callback (serial)");
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// set data format
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if (pending_control & 1) {
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pending_control &= ~1;
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mk_setup(setup, 0x40, 4, 8, 0, 0); // data format 8N1
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queue_Control_Transfer(device, &setup, NULL, this);
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return;
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}
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// set baud rate
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if (pending_control & 2) {
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pending_control &= ~2;
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uint32_t baudval = 3000000 / baudrate;
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mk_setup(setup, 0x40, 3, baudval, 0, 0);
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queue_Control_Transfer(device, &setup, NULL, this);
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return;
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}
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// configure flow control
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if (pending_control & 4) {
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pending_control &= ~4;
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mk_setup(setup, 0x40, 2, 0, 0, 0);
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queue_Control_Transfer(device, &setup, NULL, this);
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return;
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}
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// set DTR
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if (pending_control & 8) {
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pending_control &= ~8;
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mk_setup(setup, 0x40, 1, 0x0101, 0, 0);
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queue_Control_Transfer(device, &setup, NULL, this);
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return;
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}
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}
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void USBSerial::rx_callback(const Transfer_t *transfer)
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{
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@ -145,10 +186,8 @@ void USBSerial::tx_callback(const Transfer_t *transfer)
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void USBSerial::rx_data(const Transfer_t *transfer)
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{
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uint32_t len = transfer->length - ((transfer->qtd.token >> 16) & 0x7FFF);
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print("rx: ");
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print_hexbytes(transfer->buffer, len);
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// first update rxstate bitmask
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// first update rxstate bitmask, since buffer is no longer queued
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if (transfer->buffer == rx1) {
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rxstate &= 0xFE;
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} else if (transfer->buffer == rx2) {
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@ -156,7 +195,7 @@ void USBSerial::rx_data(const Transfer_t *transfer)
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}
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// get start of data and actual length
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const uint8_t *p = (const uint8_t *)transfer->buffer;
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if (ignore_first_two_bytes) {
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if (sertype == FTDI) {
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if (len >= 2) {
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p += 2;
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len -= 2;
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@ -164,18 +203,34 @@ void USBSerial::rx_data(const Transfer_t *transfer)
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len = 0;
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}
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}
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// copy data from packet buffer to circular buffer
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if (len > 0) {
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// TODO: copy to buffer
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print("rx: ");
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print_hexbytes(p, len);
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}
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// re-queue packet buffer(s) if possible
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uint32_t avail;
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// Copy data from packet buffer to circular buffer.
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// Assume the buffer will always have space, since we
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// check before queuing the buffers
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uint32_t head = rxhead;
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uint32_t tail = rxtail;
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uint32_t avail;
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if (len > 0) {
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avail = rxsize - head;
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if (avail > len) avail = len;
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memcpy(rxbuf + head, p, avail);
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if (len <= avail) {
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head += avail;
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if (head >= rxsize) head = 0;
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} else {
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head = len - avail;
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memcpy(rxbuf, p + avail, head);
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}
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rxhead = head;
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}
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// re-queue packet buffer(s) if possible
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if (head >= tail) {
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avail = rxsize - 1 + (tail - head);
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avail = rxsize - 1 - head + tail;
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} else {
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avail = (tail - head) - 1;
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avail = tail - head - 1;
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}
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uint32_t packetsize = rx2 - rx1;
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if (avail >= packetsize) {
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@ -219,21 +274,57 @@ void USBSerial::end(void)
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int USBSerial::available(void)
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{
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if (!device) return 0;
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uint32_t head = rxhead;
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uint32_t tail = rxtail;
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if (head >= tail) return head - tail;
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return 0;
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}
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int USBSerial::peek(void)
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{
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return -1;
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if (!device) return -1;
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uint32_t head = rxhead;
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uint32_t tail = rxtail;
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if (head == tail) return -1;
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if (++tail >= rxsize) tail = 0;
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return rxbuf[tail];
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}
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int USBSerial::read(void)
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{
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return -1;
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if (!device) return -1;
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uint32_t head = rxhead;
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uint32_t tail = rxtail;
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if (head == tail) return -1;
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if (++tail >= rxsize) tail = 0;
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int c = rxbuf[tail];
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rxtail = tail;
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// TODO: if rx packet not queued, and buffer now can fit a full packet, queue it
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return c;
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}
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int USBSerial::availableForWrite()
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{
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if (!device) return 0;
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uint32_t head = txhead;
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uint32_t tail = txtail;
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if (head >= tail) return txsize - 1 - head + tail;
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return tail - head - 1;
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}
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size_t USBSerial::write(uint8_t c)
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{
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if (!device) return 0;
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uint32_t head = txhead;
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if (++head >= txsize) head = 0;
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while (txtail == head) {
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// wait...
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}
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txbuf[head] = c;
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txhead = head;
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// TODO: if full packet in buffer and tx packet ready, queue it
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// TODO: otherwise set a latency timer to transmit partial packet
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return 1;
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}
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@ -265,8 +356,5 @@ size_t USBSerial::write(uint8_t c)
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void USBSerial::disconnect()
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{
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}
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