diff options
| author | Tim Redfern <tim@eclectronics.org> | 2012-01-18 18:02:10 +0000 |
|---|---|---|
| committer | Tim Redfern <tim@eclectronics.org> | 2012-01-18 18:02:10 +0000 |
| commit | 8c3efb592b16b672fc353368c04d88d3a32cf1a2 (patch) | |
| tree | 9cf4887292432c656651012c5370009b4a69cddf /arduino_libs_1_0/I2C/I2C.h | |
| parent | fe92239d966f0219e8b7caf6335a776938b4e0e3 (diff) | |
Diffstat (limited to 'arduino_libs_1_0/I2C/I2C.h')
| -rw-r--r-- | arduino_libs_1_0/I2C/I2C.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/arduino_libs_1_0/I2C/I2C.h b/arduino_libs_1_0/I2C/I2C.h new file mode 100644 index 0000000..988e773 --- /dev/null +++ b/arduino_libs_1_0/I2C/I2C.h @@ -0,0 +1,129 @@ +/*
+ I2C.cpp - I2C library
+ Copyright (c) 2011-2012 Wayne Truchsess. All right reserved.
+ Rev 4.0 - January 14th, 2012
+ - Updated to make compatible with 8MHz clock frequency
+ Rev 3.0 - January 9th, 2012
+ - Modified library to be compatible with Arduino 1.0
+ - Changed argument type from boolean to uint8_t in pullUp(),
+ setSpeed() and receiveByte() functions for 1.0 compatability
+ - Modified return values for timeout feature to report
+ back where in the transmission the timeout occured.
+ - added function scan() to perform a bus scan to find devices
+ attached to the I2C bus. Similar to work done by Todbot
+ and Nick Gammon
+ Rev 2.0 - September 19th, 2011
+ - Added support for timeout function to prevent
+ and recover from bus lockup (thanks to PaulS
+ and CrossRoads on the Arduino forum)
+ - Changed return type for stop() from void to
+ uint8_t to handle timeOut function
+ Rev 1.0 - August 8th, 2011
+
+ This is a modified version of the Arduino Wire/TWI
+ library. Functions were rewritten to provide more functionality
+ and also the use of Repeated Start. Some I2C devices will not
+ function correctly without the use of a Repeated Start. The
+ initial version of this library only supports the Master.
+
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#if(ARDUINO >= 100)
+#include <Arduino.h>
+#else
+#include <WProgram.h>
+#endif
+
+#include <inttypes.h>
+
+#ifndef I2C_h
+#define I2C_h
+
+
+#define START 0x08
+#define REPEATED_START 0x10
+#define MT_SLA_ACK 0x18
+#define MT_DATA_ACK 0x28
+#define MR_SLA_ACK 0x40
+#define MR_DATA_ACK 0x50
+#define MR_DATA_NACK 0x58
+#define TWI_STATUS (TWSR & 0xF8)
+#define SLA_W(address) (address << 1)
+#define SLA_R(address) ((address << 1) + 0x01)
+#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
+#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
+
+#define MAX_BUFFER_SIZE 32
+
+
+
+
+class I2C
+{
+ public:
+ I2C();
+ void begin();
+ void end();
+ void timeOut(uint16_t);
+ void setSpeed(uint8_t);
+ void pullup(uint8_t);
+ void scan();
+ ///////carry over from Wire library////////
+ uint8_t returnStatusWire;
+ uint8_t beginTransmission(uint8_t);
+ uint8_t beginTransmission(int);
+ uint8_t send(uint8_t);
+ uint8_t send(int);
+ uint8_t endTransmission();
+ uint8_t requestFrom(uint8_t, uint8_t);
+ uint8_t requestFrom(int, int);
+ uint8_t available();
+ ///////////////////////////////////////////
+ uint8_t write(uint8_t, uint8_t);
+ uint8_t write(int, int);
+ uint8_t write(uint8_t, uint8_t, uint8_t);
+ uint8_t write(int, int, int);
+ uint8_t write(uint8_t, uint8_t, char*);
+ uint8_t write(uint8_t, uint8_t, uint8_t*, uint8_t);
+ uint8_t read(uint8_t, uint8_t);
+ uint8_t read(int, int);
+ uint8_t read(uint8_t, uint8_t, uint8_t);
+ uint8_t read(int, int, int);
+ uint8_t read(uint8_t, uint8_t, uint8_t*);
+ uint8_t read(uint8_t, uint8_t, uint8_t, uint8_t*);
+ uint8_t receive();
+
+ private:
+ uint8_t start();
+ uint8_t sendAddress(uint8_t);
+ uint8_t sendByte(uint8_t);
+ uint8_t receiveByte(uint8_t);
+ uint8_t stop();
+ void lockUp();
+ uint8_t returnStatus;
+ uint8_t nack;
+ uint8_t data[MAX_BUFFER_SIZE];
+ static uint8_t bytesAvailable;
+ static uint8_t bufferIndex;
+ static uint8_t totalBytes;
+ static uint16_t timeOutDelay;
+
+};
+
+extern I2C I2c;
+
+#endif
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