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FTDI transmit, full packets only

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This commit is contained in:
PaulStoffregen 2017-10-15 02:39:36 -07:00
parent 3a43ebf73b
commit b58d4c7191
2 changed files with 62 additions and 8 deletions
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1
USBHost_t36.h
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@ -755,6 +755,7 @@ public:
virtual int read(void);
virtual int availableForWrite();
virtual size_t write(uint8_t c);
using Print::write;
protected:
virtual bool claim(Device_t *device, int type, const uint8_t *descriptors, uint32_t len);
virtual void control(const Transfer_t *transfer);

69
serial.cpp
View File

@ -78,6 +78,7 @@ bool USBSerial::claim(Device_t *dev, int type, const uint8_t *descriptors, uint3
queue_Data_Transfer(rxpipe, rx2, 64, this);
rxstate = 3;
}
txstate = 0;
txpipe->callback_function = tx_callback;
baudrate = 115200;
pending_control = 0x0F;
@ -236,6 +237,8 @@ void USBSerial::rx_data(const Transfer_t *transfer)
}
rxhead = head;
}
// TODO: can be this more efficient? We know from above which
// buffer is no longer queued, so possible skip most of this work?
rx_queue_packets(head, tail);
}
@ -271,7 +274,14 @@ void USBSerial::rx_queue_packets(uint32_t head, uint32_t tail)
void USBSerial::tx_data(const Transfer_t *transfer)
{
println("tx: ");
if (transfer->buffer == tx1) {
println("tx1:");
txstate &= 0xFE;
} else if (transfer->buffer == tx2) {
println("tx2:");
txstate &= 0xFD;
}
// TODO: anything need to be done with latency timeout?
}
@ -348,8 +358,57 @@ size_t USBSerial::write(uint8_t c)
}
txbuf[head] = c;
txhead = head;
// TODO: if full packet in buffer and tx packet ready, queue it
//print("head=", head);
//println(", tail=", txtail);
// if full packet in buffer and tx packet ready, queue it
NVIC_DISABLE_IRQ(IRQ_USBHS);
uint32_t tail = txtail;
if ((txstate & 0x03) != 0x03) {
// at least one packet buffer is ready to transmit
uint32_t count;
if (head >= tail) {
count = head - tail;
} else {
count = txsize + head - tail;
}
uint32_t packetsize = tx2 - tx1;
if (count >= packetsize) {
//println("txsize=", txsize);
uint8_t *p;
if ((txstate & 0x01) == 0) {
p = tx1;
txstate |= 0x01;
} else /* if ((txstate & 0x02) == 0) */ {
p = tx2;
txstate |= 0x02;
}
// copy data to packet buffer
if (++tail >= txsize) tail = 0;
uint32_t n = txsize - tail;
if (n > packetsize) n = packetsize;
//print("memcpy, offset=", tail);
//println(", len=", n);
memcpy(p, txbuf + tail, n);
if (n >= packetsize) {
tail += n - 1;
if (tail >= txsize) tail = 0;
} else {
//n = txsize - n;
uint32_t len = packetsize - n;
//println("memcpy, offset=0, len=", len);
memcpy(p + n, txbuf, len);
tail = len - 1;
}
txtail = tail;
//println("queue tx packet, newtail=", tail);
queue_Data_Transfer(txpipe, p, packetsize, this);
NVIC_ENABLE_IRQ(IRQ_USBHS);
return 1;
}
}
// TODO: otherwise set a latency timer to transmit partial packet
NVIC_ENABLE_IRQ(IRQ_USBHS);
return 1;
}
@ -370,12 +429,6 @@ size_t USBSerial::write(uint8_t c)