Scott Hoppe / MTS_SPI

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of MTS-Serial by Scott Hoppe

MTSSerialFlowControl.cpp@12:e12b79a4ab4f, 2017-03-23 (annotated)

Committer:
Leon Lindenfelser
Date:
Thu Mar 23 16:15:14 2017 -0500
Revision:
12:e12b79a4ab4f
Parent:
10:b18a1064dfc6 
Update to match gitlab commit 90a9e07c8d77b31bb36e641b4361184ef2ac8558 Feb 2 2016.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Mike Fiore 4:d348d001283b 1 #include "mbed.h"
Mike Fiore 1:d34b566d6f47 2 #include "MTSSerialFlowControl.h"
Mike Fiore 1:d34b566d6f47 3 #include "MTSLog.h"
Mike Fiore 3:8e3cb3371b09 4 #include "Utils.h"
Mike Fiore 1:d34b566d6f47 5
Mike Fiore 1:d34b566d6f47 6 using namespace mts;
Mike Fiore 1:d34b566d6f47 7
Mike Fiore 1:d34b566d6f47 8 MTSSerialFlowControl::MTSSerialFlowControl(PinName TXD, PinName RXD, PinName RTS, PinName CTS, int txBufSize, int rxBufSize)
Mike Fiore 1:d34b566d6f47 9 : MTSSerial(TXD, RXD, txBufSize, rxBufSize)
Mike Fiore 1:d34b566d6f47 10 , rxReadyFlag(false)
Mike Fiore 1:d34b566d6f47 11 , rts(RTS)
Mike Fiore 1:d34b566d6f47 12 , cts(CTS)
Mike Fiore 1:d34b566d6f47 13 {
Mike Fiore 1:d34b566d6f47 14 notifyStartSending();
Mike Fiore 1:d34b566d6f47 15
Mike Fiore 1:d34b566d6f47 16 // Calculate the high and low watermark values
Mike Fiore 10:b18a1064dfc6 17 highThreshold = mts_max(rxBufSize - 10, rxBufSize * 0.85);
Mike Fiore 1:d34b566d6f47 18 lowThreshold = rxBufSize * 0.3;
Mike Fiore 1:d34b566d6f47 19
Mike Fiore 1:d34b566d6f47 20 // Setup the low watermark callback on the internal receive buffer
Mike Fiore 1:d34b566d6f47 21 rxBuffer.attach(this, &MTSSerialFlowControl::notifyStartSending, lowThreshold, LESS);
Mike Fiore 1:d34b566d6f47 22 }
Mike Fiore 1:d34b566d6f47 23
Mike Fiore 1:d34b566d6f47 24 MTSSerialFlowControl::~MTSSerialFlowControl()
Mike Fiore 1:d34b566d6f47 25 {
Mike Fiore 1:d34b566d6f47 26 }
Mike Fiore 1:d34b566d6f47 27
Mike Fiore 1:d34b566d6f47 28 //Override the rxClear function to make sure that flow control lines are set correctly.
Mike Fiore 1:d34b566d6f47 29 void MTSSerialFlowControl::rxClear()
Mike Fiore 1:d34b566d6f47 30 {
Mike Fiore 1:d34b566d6f47 31 MTSBufferedIO::rxClear();
Mike Fiore 1:d34b566d6f47 32 notifyStartSending();
Mike Fiore 1:d34b566d6f47 33 }
Mike Fiore 1:d34b566d6f47 34
Mike Fiore 1:d34b566d6f47 35 void MTSSerialFlowControl::notifyStartSending()
Mike Fiore 1:d34b566d6f47 36 {
Mike Fiore 1:d34b566d6f47 37 if(!rxReadyFlag) {
Mike Fiore 1:d34b566d6f47 38 rts.write(0);
Mike Fiore 1:d34b566d6f47 39 rxReadyFlag = true;
Mike Fiore 1:d34b566d6f47 40 //printf("RTS LOW: READY - RX[%d/%d]\r\n", rxBuffer.size(), rxBuffer.capacity());
Mike Fiore 1:d34b566d6f47 41 }
Mike Fiore 1:d34b566d6f47 42 }
Mike Fiore 1:d34b566d6f47 43
Mike Fiore 1:d34b566d6f47 44 void MTSSerialFlowControl::notifyStopSending()
Mike Fiore 1:d34b566d6f47 45 {
Mike Fiore 1:d34b566d6f47 46 if(rxReadyFlag) {
Mike Fiore 1:d34b566d6f47 47 rts.write(1);
Mike Fiore 1:d34b566d6f47 48 rxReadyFlag = false;
Mike Fiore 1:d34b566d6f47 49 //printf("RTS HIGH: NOT-READY - RX[%d/%d]\r\n", rxBuffer.size(), rxBuffer.capacity());
Mike Fiore 1:d34b566d6f47 50 }
Mike Fiore 1:d34b566d6f47 51 }
Mike Fiore 1:d34b566d6f47 52
Mike Fiore 1:d34b566d6f47 53 void MTSSerialFlowControl::handleRead()
Mike Fiore 1:d34b566d6f47 54 {
Leon Lindenfelser 12:e12b79a4ab4f 55 char byte = _serial->getc();
Mike Fiore 1:d34b566d6f47 56 if(rxBuffer.write(byte) != 1) {
Mike Fiore 1:d34b566d6f47 57 logError("Serial Rx Byte Dropped [%c][0x%02X]", byte, byte);
Mike Fiore 1:d34b566d6f47 58 }
Mike Fiore 1:d34b566d6f47 59 if (rxBuffer.size() >= highThreshold) {
Mike Fiore 1:d34b566d6f47 60 notifyStopSending();
Mike Fiore 1:d34b566d6f47 61 }
Mike Fiore 1:d34b566d6f47 62 }
Mike Fiore 1:d34b566d6f47 63
Mike Fiore 1:d34b566d6f47 64 void MTSSerialFlowControl::handleWrite()
Mike Fiore 1:d34b566d6f47 65 {
Mike Fiore 1:d34b566d6f47 66 while(txBuffer.size() != 0) {
Leon Lindenfelser 12:e12b79a4ab4f 67 if (_serial->writeable() && cts.read() == 0) {
Mike Fiore 1:d34b566d6f47 68 char byte;
Mike Fiore 1:d34b566d6f47 69 if(txBuffer.read(byte) == 1) {
Leon Lindenfelser 12:e12b79a4ab4f 70 _serial->attach(NULL, Serial::RxIrq);
Leon Lindenfelser 12:e12b79a4ab4f 71 _serial->putc(byte);
Leon Lindenfelser 12:e12b79a4ab4f 72 _serial->attach(this, &MTSSerialFlowControl::handleRead, Serial::RxIrq);
Mike Fiore 1:d34b566d6f47 73 }
Mike Fiore 1:d34b566d6f47 74 } else {
Mike Fiore 1:d34b566d6f47 75 return;
Mike Fiore 1:d34b566d6f47 76 }
Mike Fiore 1:d34b566d6f47 77 }
Mike Fiore 1:d34b566d6f47 78 }
Mike Fiore 1:d34b566d6f47 79