From ab43e6240c8e5ecbc805e19d056bca8b9ee3b6ca Mon Sep 17 00:00:00 2001
From: Trystan Jones <crenn6977@gmail.com>
Date: Fri, 29 Jun 2012 06:51:18 +0000
Subject: Add new hard/soft Wire I2C library.

Added a generic pure abstract class to provide the interface for all
Wire implementations.  Modified the old Wire library using software
interface to use the new Base Wire abstract class.  Added a new
library which allows the use of the Wire class to use the I2C
hardware.  Changed default pin numbers for Software Wire library to
match pin numbers used for I2C/TWI shields created for the Arduino.

Signed-off-by: Trystan Jones <crenn6977@gmail.com>
---
 libraries/Wire/WireBase.cpp | 140 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 libraries/Wire/WireBase.cpp

(limited to 'libraries/Wire/WireBase.cpp')

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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