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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 LeafLabs LLC.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*****************************************************************************/
/**
* @file WireBase.cpp
* @author Trystan Jones <crenn6977@gmail.com>
* @brief Wire library, following the majority of the interface from Arduino.
* Provides a 'standard' interface to I2C (two-wire) communication for
* derived classes.
*/
/*
* Library created by crenn to allow a system which would provide users the
* 'standardised' Arduino method for interfacing with I2C devices regardless of
* whether it is I2C hardware or emulating software.
*/
#include "WireBase.h"
#include <wirish/wirish.h>
void WireBase::begin(uint8 self_addr) {
tx_buf_idx = 0;
tx_buf_overflow = false;
rx_buf_idx = 0;
rx_buf_len = 0;
}
void WireBase::beginTransmission(uint8 slave_address) {
itc_msg.addr = slave_address;
itc_msg.data = &tx_buf[tx_buf_idx];
itc_msg.length = 0;
itc_msg.flags = 0;
}
void WireBase::beginTransmission(int slave_address) {
beginTransmission((uint8)slave_address);
}
uint8 WireBase::endTransmission(void) {
if (tx_buf_overflow) {
return EDATA;
}
process();
tx_buf_idx = 0;
tx_buf_overflow = false;
return SUCCESS;
}
//TODO: Add the ability to queue messages (adding a boolean to end of function
// call, allows for the Arduino style to stay while also giving the flexibility
// to bulk send
uint8 WireBase::requestFrom(uint8 address, int num_bytes) {
if (num_bytes > WIRE_BUFSIZ) {
num_bytes = WIRE_BUFSIZ;
}
itc_msg.addr = address;
itc_msg.flags = I2C_MSG_READ;
itc_msg.length = num_bytes;
itc_msg.data = &rx_buf[rx_buf_idx];
process();
rx_buf_len += itc_msg.xferred;
itc_msg.flags = 0;
return rx_buf_len;
}
uint8 WireBase::requestFrom(int address, int numBytes) {
return WireBase::requestFrom((uint8)address, numBytes);
}
void WireBase::send(uint8 value) {
if (tx_buf_idx == WIRE_BUFSIZ) {
tx_buf_overflow = true;
return;
}
tx_buf[tx_buf_idx++] = value;
itc_msg.length++;
}
void WireBase::send(uint8* buf, int len) {
for (uint8 i = 0; i < len; i++) {
send(buf[i]);
}
}
void WireBase::send(int value) {
send((uint8)value);
}
void WireBase::send(int* buf, int len) {
send((uint8*)buf, (uint8)len);
}
void WireBase::send(char* buf) {
uint8 *ptr = (uint8*)buf;
while (*ptr) {
send(*ptr);
ptr++;
}
}
uint8 WireBase::available() {
return rx_buf_len - rx_buf_idx;
}
uint8 WireBase::receive() {
if (rx_buf_idx == rx_buf_len) {
rx_buf_idx = 0;
rx_buf_len = 0;
return 0;
} else if (rx_buf_idx == (rx_buf_len-1)) {
uint8 temp = rx_buf[rx_buf_idx];
rx_buf_idx = 0;
rx_buf_len = 0;
return temp;
}
return rx_buf[rx_buf_idx++];
}
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