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Diffstat (limited to 'libraries/Wire/WireBase.cpp')
| -rw-r--r-- | libraries/Wire/WireBase.cpp | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/libraries/Wire/WireBase.cpp b/libraries/Wire/WireBase.cpp new file mode 100644 index 0000000..00ca644 --- /dev/null +++ b/libraries/Wire/WireBase.cpp @@ -0,0 +1,140 @@ +/****************************************************************************** + * 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.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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