From 9e48dfc4fd53a2bc53367568077fbea44f88eda2 Mon Sep 17 00:00:00 2001 From: "David A. Mellis" Date: Sat, 6 Oct 2007 13:04:46 +0000 Subject: Moving libraries out from inside targets and creating bootloaders directory. --- core/libraries/Wire/Wire.cpp | 262 ------------------------------------------- 1 file changed, 262 deletions(-) delete mode 100755 core/libraries/Wire/Wire.cpp (limited to 'core/libraries/Wire/Wire.cpp') diff --git a/core/libraries/Wire/Wire.cpp b/core/libraries/Wire/Wire.cpp deleted file mode 100755 index 73369b3..0000000 --- a/core/libraries/Wire/Wire.cpp +++ /dev/null @@ -1,262 +0,0 @@ -/* - TwoWire.cpp - TWI/I2C library for Wiring & Arduino - Copyright (c) 2006 Nicholas Zambetti. All right reserved. - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - This library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with this library; if not, write to the Free Software - Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA -*/ - -extern "C" { - #include - #include - #include - #include "twi.h" -} - -#include "Wire.h" - -// Initialize Class Variables ////////////////////////////////////////////////// - -uint8_t* TwoWire::rxBuffer = 0; -uint8_t TwoWire::rxBufferIndex = 0; -uint8_t TwoWire::rxBufferLength = 0; - -uint8_t TwoWire::txAddress = 0; -uint8_t* TwoWire::txBuffer = 0; -uint8_t TwoWire::txBufferIndex = 0; -uint8_t TwoWire::txBufferLength = 0; - -uint8_t TwoWire::transmitting = 0; -void (*TwoWire::user_onRequest)(void); -void (*TwoWire::user_onReceive)(int); - -// Constructors //////////////////////////////////////////////////////////////// - -TwoWire::TwoWire() -{ -} - -// Public Methods ////////////////////////////////////////////////////////////// - -void TwoWire::begin(void) -{ - // init buffer for reads - rxBuffer = (uint8_t*) calloc(BUFFER_LENGTH, sizeof(uint8_t)); - rxBufferIndex = 0; - rxBufferLength = 0; - - // init buffer for writes - txBuffer = (uint8_t*) calloc(BUFFER_LENGTH, sizeof(uint8_t)); - txBufferIndex = 0; - txBufferLength = 0; - - twi_init(); -} - -void TwoWire::begin(uint8_t address) -{ - twi_setAddress(address); - twi_attachSlaveTxEvent(onRequestService); - twi_attachSlaveRxEvent(onReceiveService); - begin(); -} - -void TwoWire::begin(int address) -{ - begin((uint8_t)address); -} - -void TwoWire::requestFrom(uint8_t address, uint8_t quantity) -{ - // clamp to buffer length - if(quantity > BUFFER_LENGTH){ - quantity = BUFFER_LENGTH; - } - // perform blocking read into buffer - twi_readFrom(address, rxBuffer, quantity); - // set rx buffer iterator vars - rxBufferIndex = 0; - rxBufferLength = quantity; -} - -void TwoWire::requestFrom(int address, int quantity) -{ - requestFrom((uint8_t)address, (uint8_t)quantity); -} - -void TwoWire::beginTransmission(uint8_t address) -{ - // indicate that we are transmitting - transmitting = 1; - // set address of targeted slave - txAddress = address; - // reset tx buffer iterator vars - txBufferIndex = 0; - txBufferLength = 0; -} - -void TwoWire::beginTransmission(int address) -{ - beginTransmission((uint8_t)address); -} - -void TwoWire::endTransmission(void) -{ - // transmit buffer (blocking) - twi_writeTo(txAddress, txBuffer, txBufferLength, 1); - // reset tx buffer iterator vars - txBufferIndex = 0; - txBufferLength = 0; - // indicate that we are done transmitting - transmitting = 0; -} - -// must be called in: -// slave tx event callback -// or after beginTransmission(address) -void TwoWire::send(uint8_t data) -{ - if(transmitting){ - // in master transmitter mode - // don't bother if buffer is full - if(txBufferLength >= BUFFER_LENGTH){ - return; - } - // put byte in tx buffer - txBuffer[txBufferIndex] = data; - ++txBufferIndex; - // update amount in buffer - txBufferLength = txBufferIndex; - }else{ - // in slave send mode - // reply to master - twi_transmit(&data, 1); - } -} - -// must be called in: -// slave tx event callback -// or after beginTransmission(address) -void TwoWire::send(uint8_t* data, uint8_t quantity) -{ - if(transmitting){ - // in master transmitter mode - for(uint8_t i = 0; i < quantity; ++i){ - send(data[i]); - } - }else{ - // in slave send mode - // reply to master - twi_transmit(data, quantity); - } -} - -// must be called in: -// slave tx event callback -// or after beginTransmission(address) -void TwoWire::send(char* data) -{ - send((uint8_t*)data, strlen(data)); -} - -// must be called in: -// slave tx event callback -// or after beginTransmission(address) -void TwoWire::send(int data) -{ - send((uint8_t)data); -} - -// must be called in: -// slave rx event callback -// or after requestFrom(address, numBytes) -uint8_t TwoWire::available(void) -{ - return rxBufferLength - rxBufferIndex; -} - -// must be called in: -// slave rx event callback -// or after requestFrom(address, numBytes) -uint8_t TwoWire::receive(void) -{ - // default to returning null char - // for people using with char strings - uint8_t value = '\0'; - - // get each successive byte on each call - if(rxBufferIndex < rxBufferLength){ - value = rxBuffer[rxBufferIndex]; - ++rxBufferIndex; - } - - return value; -} - -// behind the scenes function that is called when data is received -void TwoWire::onReceiveService(uint8_t* inBytes, int numBytes) -{ - // don't bother if user hasn't registered a callback - if(!user_onReceive){ - return; - } - // don't bother if rx buffer is in use by a master requestFrom() op - // i know this drops data, but it allows for slight stupidity - // meaning, they may not have read all the master requestFrom() data yet - if(rxBufferIndex < rxBufferLength){ - return; - } - // copy twi rx buffer into local read buffer - // this enables new reads to happen in parallel - for(uint8_t i = 0; i < numBytes; ++i){ - rxBuffer[i] = inBytes[i]; - } - // set rx iterator vars - rxBufferIndex = 0; - rxBufferLength = numBytes; - // alert user program - user_onReceive(numBytes); -} - -// behind the scenes function that is called when data is requested -void TwoWire::onRequestService(void) -{ - // don't bother if user hasn't registered a callback - if(!user_onRequest){ - return; - } - // reset tx buffer iterator vars - // !!! this will kill any pending pre-master sendTo() activity - txBufferIndex = 0; - txBufferLength = 0; - // alert user program - user_onRequest(); -} - -// sets function called on slave write -void TwoWire::onReceive( void (*function)(int) ) -{ - user_onReceive = function; -} - -// sets function called on slave read -void TwoWire::onRequest( void (*function)(void) ) -{ - user_onRequest = function; -} - -// Preinstantiate Objects ////////////////////////////////////////////////////// - -TwoWire Wire = TwoWire(); - -- cgit v1.2.3-18-g5258