MTS_SPI_Slave unfinished
Fork of MTS-Serial by
Diff: MTSSerialFlowControl.cpp
- Revision:
- 1:d34b566d6f47
- Child:
- 3:8e3cb3371b09
diff -r 6585b7c8cd41 -r d34b566d6f47 MTSSerialFlowControl.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MTSSerialFlowControl.cpp Mon May 19 11:18:10 2014 -0500 @@ -0,0 +1,79 @@ +#include "MTSSerialFlowControl.h" + +#include "MTSLog.h" +#include "Vars.h" + +using namespace mts; + +MTSSerialFlowControl::MTSSerialFlowControl(PinName TXD, PinName RXD, PinName RTS, PinName CTS, int txBufSize, int rxBufSize) + : MTSSerial(TXD, RXD, txBufSize, rxBufSize) + , rxReadyFlag(false) + , rts(RTS) + , cts(CTS) +{ + notifyStartSending(); + + // Calculate the high and low watermark values + highThreshold = MAX(rxBufSize - 10, rxBufSize * 0.85); + lowThreshold = rxBufSize * 0.3; + + // Setup the low watermark callback on the internal receive buffer + rxBuffer.attach(this, &MTSSerialFlowControl::notifyStartSending, lowThreshold, LESS); +} + +MTSSerialFlowControl::~MTSSerialFlowControl() +{ +} + +//Override the rxClear function to make sure that flow control lines are set correctly. +void MTSSerialFlowControl::rxClear() +{ + MTSBufferedIO::rxClear(); + notifyStartSending(); +} + +void MTSSerialFlowControl::notifyStartSending() +{ + if(!rxReadyFlag) { + rts.write(0); + rxReadyFlag = true; + //printf("RTS LOW: READY - RX[%d/%d]\r\n", rxBuffer.size(), rxBuffer.capacity()); + } +} + +void MTSSerialFlowControl::notifyStopSending() +{ + if(rxReadyFlag) { + rts.write(1); + rxReadyFlag = false; + //printf("RTS HIGH: NOT-READY - RX[%d/%d]\r\n", rxBuffer.size(), rxBuffer.capacity()); + } +} + +void MTSSerialFlowControl::handleRead() +{ + char byte = serial.getc(); + if(rxBuffer.write(byte) != 1) { + logError("Serial Rx Byte Dropped [%c][0x%02X]", byte, byte); + } + if (rxBuffer.size() >= highThreshold) { + notifyStopSending(); + } +} + +void MTSSerialFlowControl::handleWrite() +{ + while(txBuffer.size() != 0) { + if (serial.writeable() && cts.read() == 0) { + char byte; + if(txBuffer.read(byte) == 1) { + serial.attach(NULL, Serial::RxIrq); + serial.putc(byte); + serial.attach(this, &MTSSerialFlowControl::handleRead, Serial::RxIrq); + } + } else { + return; + } + } +} +