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fontamiHwfbraghiroli
fontamiHw
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fbraghiroli
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Added missing IO_Extended initialization file
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‎hardware/AMEL/samd/variants/AMEL_SmartEverything/WireIoExt.cpp

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/*
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* TWI/I2C library for Arduino Zero
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* based on Copyright (c) 2011 Cristian Maglie <[email protected]>.
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* Copyright (c) 2014 Arduino.
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* All rights reserved.
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*
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* Copyright (c) 2015 Amel-Tech (a division of Amel Srl). All right reserved.
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*
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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extern "C" {
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#include <string.h>
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}
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#include "WireIoExt.h"
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#include "variant.h"
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#include "wiring_private.h"
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I2CIoExt::I2CIoExt(SERCOM * s)
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{
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this->sercom = s;
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transmissionBegun = false;
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}
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void I2CIoExt::begin(void) {
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//Master Mode
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sercom->initMasterWIRE(TWI_CLOCK);
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sercom->enableWIRE();
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pinPeripheral(PIN_WIRE_SDA, g_APinDescription[PIN_WIRE_SDA].ulPinType);
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pinPeripheral(PIN_WIRE_SCL, g_APinDescription[PIN_WIRE_SCL].ulPinType);
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}
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uint8_t I2CIoExt::requestFrom(uint8_t address, size_t quantity, bool stopBit)
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{
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if(quantity == 0)
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{
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return 0;
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}
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size_t byteRead = 0;
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if(sercom->startTransmissionWIRE(address, WIRE_READ_FLAG))
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{
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// Read first data
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rxBuffer.store_char(sercom->readDataWIRE());
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// Connected to slave
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//while(toRead--)
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for(byteRead = 0; byteRead < quantity; ++byteRead)
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{
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if( byteRead == quantity - 1) // Stop transmission
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{
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sercom->prepareNackBitWIRE(); // Prepare NACK to stop slave transmission
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//sercom->readDataWIRE(); // Clear data register to send NACK
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sercom->prepareCommandBitsWire(WIRE_MASTER_ACT_STOP); // Send Stop
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}
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else // Continue transmission
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{
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sercom->prepareAckBitWIRE(); // Prepare Acknowledge
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sercom->prepareCommandBitsWire(WIRE_MASTER_ACT_READ); // Prepare the ACK command for the slave
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rxBuffer.store_char( sercom->readDataWIRE() ); // Read data and send the ACK
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}
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}
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}
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return byteRead;
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}
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uint8_t I2CIoExt::requestFrom(uint8_t address, size_t quantity)
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{
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return requestFrom(address, quantity, true);
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}
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void I2CIoExt::beginTransmission(uint8_t address) {
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// save address of target and clear buffer
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txAddress = address;
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txBuffer.clear();
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transmissionBegun = true;
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}
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// Errors:
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// 0 : Success
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// 1 : Data too long
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// 2 : NACK on transmit of address
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// 3 : NACK on transmit of data
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// 4 : Other error
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uint8_t I2CIoExt::endTransmission(bool stopBit)
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{
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transmissionBegun = false ;
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// Check if there are data to send
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if ( txBuffer.available() == 0)
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{
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return 4 ;
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}
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// Start I2C transmission
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if ( !sercom->startTransmissionWIRE( txAddress, WIRE_WRITE_FLAG ) )
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{
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sercom->prepareCommandBitsWire(WIRE_MASTER_ACT_STOP);
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return 2 ; // Address error
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}
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// Send all buffer
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while( txBuffer.available() )
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{
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// Trying to send data
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if ( !sercom->sendDataMasterWIRE( txBuffer.read_char() ) )
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{
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sercom->prepareCommandBitsWire(WIRE_MASTER_ACT_STOP);
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return 3 ; // Nack or error
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}
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if(txBuffer.available() == 0)
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{
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sercom->prepareCommandBitsWire(WIRE_MASTER_ACT_STOP);
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}
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}
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return 0;
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}
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uint8_t I2CIoExt::endTransmission()
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{
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return endTransmission(true);
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}
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size_t I2CIoExt::write(uint8_t ucData)
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{
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if(sercom->isMasterWIRE())
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{
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// No writing, without begun transmission or a full buffer
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if ( !transmissionBegun || txBuffer.isFull() )
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{
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return 0 ;
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}
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txBuffer.store_char( ucData ) ;
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return 1 ;
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}
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else
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{
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if(sercom->sendDataSlaveWIRE( ucData ))
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{
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return 1;
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}
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}
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return 0;
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}
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size_t I2CIoExt::write(const uint8_t *data, size_t quantity)
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{
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//Try to store all data
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for(size_t i = 0; i < quantity; ++i)
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{
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//Return the number of data stored, when the buffer is full (if write return 0)
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if(!write(data[i]))
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return i;
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}
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//All data stored
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return quantity;
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}
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int I2CIoExt::available(void)
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{
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return rxBuffer.available();
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}
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int I2CIoExt::read(void)
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{
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return rxBuffer.read_char();
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}
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int I2CIoExt::peek(void)
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{
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return rxBuffer.peek();
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}
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void I2CIoExt::flush(void)
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{
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// Do nothing, use endTransmission(..) to force
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// data transfer.
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}
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#if WIRE_INTERFACES_COUNT > 0
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I2CIoExt WireTemp(&sercom3);
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#endif

‎hardware/AMEL/samd/variants/AMEL_SmartEverything/WireIoExt.h

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/*
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* TwoWire.h - TWI/I2C library for Arduino Due
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* Copyright (c) 2011 Cristian Maglie <[email protected]>.
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* All rights reserved.
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*
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* Copyright (c) 2015 Amel-Tech (a division of Amel Srl). All right reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef WIRE_IO_EXT_h
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#define WIRE_IO_EXT_h
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#include "Stream.h"
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#include "variant.h"
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#include "SERCOM.h"
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#include "RingBuffer.h"
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#define BUFFER_LENGTH 32
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class I2CIoExt : public Stream
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{
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public:
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I2CIoExt(SERCOM *s);
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void begin();
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void beginTransmission(uint8_t);
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uint8_t endTransmission(bool stopBit);
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uint8_t endTransmission(void);
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uint8_t requestFrom(uint8_t address, size_t quantity, bool stopBit);
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uint8_t requestFrom(uint8_t address, size_t quantity);
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size_t write(uint8_t data);
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size_t write(const uint8_t * data, size_t quantity);
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virtual int available(void);
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virtual int read(void);
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virtual int peek(void);
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virtual void flush(void);
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using Print::write;
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private:
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SERCOM * sercom;
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bool transmissionBegun;
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// RX Buffer
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RingBuffer rxBuffer;
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//TX buffer
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RingBuffer txBuffer;
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uint8_t txAddress;
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// TWI clock frequency
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static const uint32_t TWI_CLOCK = 100000;
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};
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extern I2CIoExt WireTemp;
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#endif

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