104 lines
3.1 KiB
C++
104 lines
3.1 KiB
C++
/******************************************************************************
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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 HardWire.cpp
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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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*/
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/*
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* Library created by crenn to use the new WireBase system and allow Arduino
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* users easy interaction with the I2C Hardware in a familiar method.
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*/
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#include "Wire.h"
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uint8 HardWire::process(uint8 stop) {
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int8 res = i2c_master_xfer(sel_hard, &itc_msg, 1, 0);
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if (res == I2C_ERROR_PROTOCOL) {
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if (sel_hard->error_flags & I2C_SR1_AF) { /* NACK */
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res = (sel_hard->error_flags & I2C_SR1_ADDR ? ENACKADDR :
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ENACKTRNS);
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} else if (sel_hard->error_flags & I2C_SR1_OVR) { /* Over/Underrun */
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res = EDATA;
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} else { /* Bus or Arbitration error */
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res = EOTHER;
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}
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i2c_disable(sel_hard);
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i2c_master_enable(sel_hard, (I2C_BUS_RESET | dev_flags));
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}
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return res;
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}
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uint8 HardWire::process(){
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return process(true);
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}
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// TODO: Add in Error Handling if devsel is out of range for other Maples
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HardWire::HardWire(uint8 dev_sel, uint8 flags) {
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if (dev_sel == 1) {
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sel_hard = I2C1;
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} else if (dev_sel == 2) {
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sel_hard = I2C2;
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} else {
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ASSERT(1);
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}
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dev_flags = flags;
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}
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HardWire::~HardWire() {
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i2c_disable(sel_hard);
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sel_hard = 0;
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}
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void HardWire::begin(uint8 self_addr) {
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i2c_master_enable(sel_hard, dev_flags);
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}
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void HardWire::end() {
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i2c_disable(sel_hard);
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sel_hard = 0;
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}
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void HardWire::setClock(uint32_t frequencyHz)
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{
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switch(frequencyHz)
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{
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case 400000:
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dev_flags |= I2C_FAST_MODE;// set FAST_MODE bit
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break;
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case 100000:
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default:
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dev_flags &= ~I2C_FAST_MODE;// clear FAST_MODE bit
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break;
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}
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}
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HardWire Wire(1);
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