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@ -40,7 +40,7 @@
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#ifndef _SOFTWIRE_H_
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#define _SOFTWIRE_H_
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#include "WireBase.h"
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#include "utility/WireBase.h"
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#include "wirish.h"
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/*
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@ -25,7 +25,7 @@
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*****************************************************************************/
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/**
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* @file TwoWire.h
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* @file Wire.h
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* @author Trystan Jones <crenn6977@gmail.com>
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* @brief Wire library, uses the hardware I2C available in the Maple to
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* interact with I2C slave devices.
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@ -39,7 +39,7 @@
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#ifndef _TWOWIRE_H_
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#define _TWOWIRE_H_
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#include "WireBase.h"
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#include "utility/WireBase.h"
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#include "wirish.h"
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#include <libmaple/i2c.h>
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#######################################
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# Datatypes (KEYWORD1)
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#######################################
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TwoWire KEYWORD1
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SoftWire KEYWORD1
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#######################################
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# Methods and Functions (KEYWORD2)
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#######################################
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#######################################
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# Constants (LITERAL1)
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#######################################
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SOFT_STANDARD LITERAL1
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SOFT_FAST LITERAL1
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/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 LeafLabs LLC.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file WireBase.cpp
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* @author Trystan Jones <crenn6977@gmail.com>
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* @brief Wire library, following the majority of the interface from Arduino.
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* Provides a 'standard' interface to I2C (two-wire) communication for
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* derived classes.
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*/
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/*
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* Library created by crenn to allow a system which would provide users the
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* 'standardised' Arduino method for interfacing with I2C devices regardless of
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* whether it is I2C hardware or emulating software.
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*/
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#include "WireBase.h"
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#include "wirish.h"
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void WireBase::begin(uint8 self_addr) {
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tx_buf_idx = 0;
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tx_buf_overflow = false;
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rx_buf_idx = 0;
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rx_buf_len = 0;
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}
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void WireBase::beginTransmission(uint8 slave_address) {
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itc_msg.addr = slave_address;
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itc_msg.data = &tx_buf[tx_buf_idx];
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itc_msg.length = 0;
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itc_msg.flags = 0;
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}
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void WireBase::beginTransmission(int slave_address) {
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beginTransmission((uint8)slave_address);
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}
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uint8 WireBase::endTransmission(bool stop) {
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uint8 retVal;
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if (tx_buf_overflow) {
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return EDATA;
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}
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retVal = process(stop);// Changed so that the return value from process is returned by this function see also the return line below
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tx_buf_idx = 0;
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tx_buf_overflow = false;
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return retVal;//SUCCESS;
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}
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uint8 WireBase::endTransmission(){
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endTransmission(true);
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}
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//TODO: Add the ability to queue messages (adding a boolean to end of function
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// call, allows for the Arduino style to stay while also giving the flexibility
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// to bulk send
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uint8 WireBase::requestFrom(uint8 address, int num_bytes) {
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if (num_bytes > BUFFER_LENGTH) {
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num_bytes = BUFFER_LENGTH;
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}
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itc_msg.addr = address;
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itc_msg.flags = I2C_MSG_READ;
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itc_msg.length = num_bytes;
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itc_msg.data = &rx_buf[rx_buf_idx];
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process();
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rx_buf_len += itc_msg.xferred;
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itc_msg.flags = 0;
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return rx_buf_len;
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}
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uint8 WireBase::requestFrom(int address, int numBytes) {
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return WireBase::requestFrom((uint8)address, numBytes);
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}
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void WireBase::write(uint8 value) {
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if (tx_buf_idx == BUFFER_LENGTH) {
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tx_buf_overflow = true;
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return;
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}
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tx_buf[tx_buf_idx++] = value;
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itc_msg.length++;
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}
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void WireBase::write(uint8* buf, int len) {
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for (uint8 i = 0; i < len; i++) {
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write(buf[i]);
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}
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}
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void WireBase::write(int value) {
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write((uint8)value);
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}
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void WireBase::write(int* buf, int len) {
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write((uint8*)buf, (uint8)len);
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}
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void WireBase::write(char* buf) {
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uint8 *ptr = (uint8*)buf;
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while (*ptr) {
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write(*ptr);
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ptr++;
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}
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}
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uint8 WireBase::available() {
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return rx_buf_len - rx_buf_idx;
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}
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uint8 WireBase::read() {
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if (rx_buf_idx == rx_buf_len) {
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rx_buf_idx = 0;
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rx_buf_len = 0;
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return 0;
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} else if (rx_buf_idx == (rx_buf_len-1)) {
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uint8 temp = rx_buf[rx_buf_idx];
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rx_buf_idx = 0;
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rx_buf_len = 0;
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return temp;
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}
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return rx_buf[rx_buf_idx++];
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}
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@ -0,0 +1,145 @@
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/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 LeafLabs LLC.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file WireBase.h
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* @author Trystan Jones <crenn6977@gmail.com>
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* @brief Wire library, following the majority of the interface from Arduino.
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* Provides a 'standard' interface to I2C (two-wire) communication for
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* derived classes.
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*/
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/*
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* Library created by crenn to allow a system which would provide users the
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* 'standardised' Arduino method for interfacing with I2C devices regardless of
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* whether it is I2C hardware or emulating software.
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*/
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#ifndef _WIREBASE_H_
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#define _WIREBASE_H_
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#include "wirish.h"
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#include <libmaple/i2c.h>
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#define BUFFER_LENGTH 32
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/* return codes from endTransmission() */
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#define SUCCESS 0 /* transmission was successful */
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#define EDATA 1 /* too much data */
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#define ENACKADDR 2 /* received nack on transmit of address */
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#define ENACKTRNS 3 /* received nack on transmit of data */
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#define EOTHER 4 /* other error */
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class WireBase { // Abstraction is awesome!
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protected:
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i2c_msg itc_msg;
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uint8 rx_buf[BUFFER_LENGTH]; /* receive buffer */
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uint8 rx_buf_idx; /* first unread idx in rx_buf */
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uint8 rx_buf_len; /* number of bytes read */
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uint8 tx_buf[BUFFER_LENGTH]; /* transmit buffer */
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uint8 tx_buf_idx; // next idx available in tx_buf, -1 overflow
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boolean tx_buf_overflow;
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// Force derived classes to define process function
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virtual uint8 process(uint8) = 0;
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virtual uint8 process() = 0;
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public:
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WireBase() {}
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~WireBase() {}
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/*
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* Initialises the class interface
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*/
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// Allow derived classes to overwrite begin function
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virtual void begin(uint8 = 0x00);
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/*
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* Sets up the transmission message to be processed
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*/
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void beginTransmission(uint8);
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/*
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* Allow only 8 bit addresses to be used
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*/
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void beginTransmission(int);
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/*
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* Call the process function to process the message if the TX
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* buffer has not overflowed.
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*/
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uint8 endTransmission(bool);
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uint8 endTransmission(void);
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/*
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* Request bytes from a slave device and process the request,
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* storing into the receiving buffer.
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*/
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uint8 requestFrom(uint8, int);
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/*
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* Allow only 8 bit addresses to be used when requesting bytes
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*/
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uint8 requestFrom(int, int);
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/*
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* Stack up bytes to be sent when transmitting
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*/
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void write(uint8);
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/*
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* Stack up bytes from the array to be sent when transmitting
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*/
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void write(uint8*, int);
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/*
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* Ensure that a sending data will only be 8-bit bytes
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*/
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void write(int);
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/*
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* Ensure that an array sending data will only be 8-bit bytes
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*/
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void write(int*, int);
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/*
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* Stack up bytes from a string to be sent when transmitting
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*/
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void write(char*);
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/*
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* Return the amount of bytes that is currently in the receiving buffer
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*/
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uint8 available();
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/*
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* Return the value of byte in the receiving buffer that is currently being
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* pointed to
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*/
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uint8 read();
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};
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#endif // _WIREBASE_H_
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