![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
I2C not yet integrated
Tested working with single and differential voltages.
Connect SCL (pin 11) to D15 Connect SDA (pin 10) to D14 Connect pin 16 to +5v Connect pin 9 to gnd
LT_I2C.h
- Committer:
- lrdawg99
- Date:
- 2016-11-16
- Revision:
- 0:1473318f27b6
- Child:
- 2:c9e727dcd00e
File content as of revision 0:1473318f27b6:
/*! LT_I2C: Routines to communicate with ATmega328P's hardware I2C port. REVISION HISTORY $Revision: 3659 $ $Date: 2015-07-01 10:19:20 -0700 (Wed, 01 Jul 2015) $ Copyright (c) 2013, Linear Technology Corp.(LTC) All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. The views and conclusions contained in the software and documentation are those of the authors and should not be interpreted as representing official policies, either expressed or implied, of Linear Technology Corp. The Linear Technology Linduino is not affiliated with the official Arduino team. However, the Linduino is only possible because of the Arduino team's commitment to the open-source community. Please, visit http://www.arduino.cc and http://store.arduino.cc , and consider a purchase that will help fund their ongoing work. */ /*! @file @ingroup LT_I2C Library Header File for LT_I2C: Routines to communicate with ATmega328P's hardware I2C port. */ #ifndef LT_I2C_H #define LT_I2C_H #include <stdint.h> //#include <Wire.h> //! @name HARDWARE I2C PRESCALER VALUES //! @{ #define HARDWARE_I2C_PRESCALER_1 0 #define HARDWARE_I2C_PRESCALER_4 1 #define HARDWARE_I2C_PRESCALER_16 2 #define HARDWARE_I2C_PRESCALER_64 3 //! @} //! @name I2C READ and WRITE BITS //! @{ //! Eighth bit (LSB) of I2C address indicates a "read" or "write". //! (The first seven bits are the 7-bit I2C address.) #define I2C_READ_BIT 0x01 #define I2C_WRITE_BIT 0x00 //! @} //! @name STATUS BITS //! @{ #define STATUS_START 0x08 #define STATUS_REPEATED_START 0x10 #define STATUS_ADDRESS_WRITE_ACK 0x18 #define STATUS_ADDRESS_WRITE_NACK 0x20 #define STATUS_WRITE_ACK 0x28 #define STATUS_WRITE_NACK 0x30 #define STATUS_ARBITRATION_LOST 0x38 #define STATUS_ADDRESS_READ_ACK 0x40 #define STATUS_ADDRESS_READ_NACK 0x48 #define STATUS_READ_ACK 0x50 #define STATUS_READ_NACK 0x58 //! @} //! @name TIMEOUT AND DELAY IN US //! @{ #define HW_I2C_DELAY 1 #define HW_I2C_TIMEOUT 20000 //! @} //! @name ACK OR NACK PARAMETER PASSED TO I2C_READ //! @{ #define WITH_ACK 0 //!< Use with i2c_read(WITH_ACK) to read with an acknowledge #define WITH_NACK 1 //!< Use with i2c_read(WITH_NACK) to read without an acknowledge. Normally used after the last byte of a multi-byte read. //! @} //! @name OPTIONAL I2C Address MACRO //! @{ #define I2C_8ADDR(address) (address >> 1) //!< Use to convert an 8-bit I2C address to 7 bits. //! @} //! Read a byte, store in "value". //! @return 0 on success, 1 on failure int8_t i2c_read_byte(uint8_t address, //!< 7-bit I2C address uint8_t *value //!< Byte to be read ); //! Write "value" byte to device at "address" //! @return 0 on success, 1 on failure int8_t i2c_write_byte(uint8_t address, //!< 7-bit I2C address uint8_t value //!< Byte to be written ); //! Read a byte of data at register specified by "command", store in "value" //! @return 0 on success, 1 on failure int8_t i2c_read_byte_data(uint8_t address, //!< 7-bit I2C address uint8_t command, //!< Command byte uint8_t *value //!< Byte to be read ); //! Write a byte of data to register specified by "command" //! @return 0 on success, 1 on failure int8_t i2c_write_byte_data(uint8_t address, //!< 7-bit I2C address uint8_t command, //!< Command byte uint8_t value //!< Byte to be written ); //! Read a 16-bit word of data from register specified by "command" //! @return 0 on success, 1 on failure int8_t i2c_read_word_data(uint8_t address, //!< 7-bit I2C address uint8_t command, //!< Command byte uint16_t *value //!< Word to be read ); //! Write a 16-bit word of data to register specified by "command" //! @return 0 on success, 1 on failure int8_t i2c_write_word_data(uint8_t address, //!< 7-bit I2C address uint8_t command, //!< Command byte uint16_t value //!< Word to be written ); //! Read a block of data, starting at register specified by "command" and ending at (command + length - 1) //! @return 0 on success, 1 on failure int8_t i2c_read_block_data(uint8_t address, //!< 7-bit I2C address uint8_t command, //!< Command byte uint8_t length, //!< Length of array uint8_t *values //!< Byte array to be read ); //! Read a block of data, no command byte, reads length number of bytes and stores it in values. //! @return 0 on success, 1 on failure int8_t i2c_read_block_data(uint8_t address, //!< 7-bit I2C address uint8_t length, //!< Length of array uint8_t *values //!< Byte array to be read ); //! Write a block of data, starting at register specified by "command" and ending at (command + length - 1) //! @return 0 on success, 1 on failure int8_t i2c_write_block_data(uint8_t address, //!< 7-bit I2C address uint8_t command, //!< Command byte uint8_t length, //!< Length of array uint8_t *values //!< Byte array to be written ); //! Write a two command bytes, then receive a block of data //! @return 0 on success, 1 on failure int8_t i2c_two_byte_command_read_block(uint8_t address, //!< 7-bit I2C address uint16_t command, //!< Command word uint8_t length, //!< Length of array uint8_t *values //!< Byte array to be read ); //! Initializes Linduino I2C port. //! Before communicating to the I2C port through the QuikEval connector, you must also run //! quikeval_I2C_connect to connect the I2C port to the QuikEval connector through the //! QuikEval MUX (and disconnect SPI). void quikeval_I2C_init(void); //! Switch MUX to connect I2C pins to QuikEval connector. //! This will disconnect SPI pins. void quikeval_I2C_connect(void); //! i2c_enable or quikeval_I2C_init must be called before using any of the other I2C routines. void i2c_enable(void); //! Write start bit to the hardware I2C port //! @return 0 if successful, 1 if not successful int8_t i2c_start(); //! Write a repeat start bit to the hardware I2C port //! @return 0 if successful, 1 if not successful int8_t i2c_repeated_start(); //! Write stop bit to the hardware I2C port void i2c_stop(); //! Send a data byte to hardware I2C port //! @return 0 if successful, 1 if not successful int8_t i2c_write(uint8_t data //!< byte that will be written to hardware I2C port. ); //! Read a data byte from the hardware I2C port. //! If ack is 0 then an acknowledge (ACK) is generated, else a NACK is generated. //! @return the data byte read. uint8_t i2c_read(int8_t ack //!< If ACK is 0 then an acknowledge is generated, else a NACK is generated. ); //! Poll the I2C port and look for an acknowledge //! @return Returns 0 if successful, 1 if not successful int8_t i2c_poll(uint8_t i2c_address //!< i2c_address is the address of the slave being polled. ); // //! Read a byte, store in "value". // //! @return -1 if failed or value if it succeeds // int32_t i2c_read_byte(uint8_t address, //!< 7-bit I2C address // uint8_t *value //!< Byte to be read // ); // // //! Write "value" byte to device at "address" // //! @return -1 if failed or 0 if it succeeds // int32_t i2c_write_byte(uint8_t address, //!< 7-bit I2C address // uint8_t value //!< Byte to be written // ); // // //! Read a byte of data at register specified by "command", store in "value" // //! @return -1 if failed or value if it succeeds // int32_t i2c_read_byte_data(uint8_t address, //!< 7-bit I2C address // uint8_t command, //!< Command byte // uint8_t *value //!< Byte to be read // ); // // //! Write a byte of data to register specified by "command" // //! @return -1 if failed or 0 if it succeeds // int32_t i2c_write_byte_data(uint8_t address, //!< 7-bit I2C address // uint8_t command, //!< Command byte // uint8_t value //!< Byte to be written // ); // // //! Read a 16-bit word of data from register specified by "command" // //! @return -1 if failed or value if it succeeds // int32_t i2c_read_word_data(uint8_t address, //!< 7-bit I2C address // uint8_t command, //!< Command byte // uint16_t *value //!< Word to be read // ); // // //! Write a 16-bit word of data to register specified by "command" // //! @return -1 if failed or 0 if it succeeds // int32_t i2c_write_word_data(uint8_t address, //!< 7-bit I2C address // uint8_t command, //!< Command byte // uint16_t value //!< Word to be written // ); // // // //! Read a block of data, starting at register specified by "command" and ending at (command + length - 1) // //! @return Byte count // int32_t i2c_read_block_data(uint8_t address, //!< 7-bit I2C address // uint8_t command, //!< Command byte // uint8_t length, //!< Length of array // uint8_t *values //!< Byte array to be read // ); // // //! Write a block of data, starting at register specified by "command" and ending at (command + length - 1) // //! @return Byte count // int32_t i2c_write_block_data(uint8_t address, //!< 7-bit I2C address // uint8_t command, //!< Command byte // uint8_t length, //!< Length of array // uint8_t *values //!< Byte array to be written // ); // // //! Write a two command bytes, then receive a block of data // //! @return Byte count // int32_t i2c_two_byte_command_read_block(uint8_t address, //!< 7-bit I2C address // uint16_t command, //!< Command word // uint8_t length, //!< Length of array // uint8_t *values //!< Byte array to be read // ); // // //! Initializes Linduino I2C port. // //! Before communicating to the I2C port through the QuikEval connector, you must also run // //! quikeval_I2C_connect to connect the I2C port to the QuikEval connector through the // //! QuikEval MUX (and disconnect SPI). // void quikeval_I2C_init(void); // // //! Switch MUX to connect I2C pins to QuikEval connector // //! This will disconnect SPI pins. // void quikeval_I2C_connect(void); // // //! Setup and enable the hardware I2C interface. // //! Must be called before using any of the other routines. // // 100kHz example: // // uint8 bit_rate = 18; // // hw_i2c_enable(bit_rate, HARDWARE_I2C_PRESCALER_4); // void i2c_enable(uint8_t bit_rate, //!< I2C Bit Rate // uint8_t prescaler //!< I2C prescaler // ); // LT I2C functions to emulate Linux SMBus functions for E-Z porting. There does not appear to be // a single source of the "correct" way to implement these functions. /////////////////////////////////////////////////////////////////////////////////////////////////////////////// //// From http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/i2c/dev-interface /////////////////////////////////////////////////////////////////////////////////////////////////////////////// //// You can do plain I2C transactions by using read(2) and write(2) calls. //// You do not need to pass the address byte; instead, set it through //// ioctl I2C_SLAVE before you try to access the device. //// //// You can do SMBus level transactions (see documentation file smbus-protocol //// for details) through the following functions: //// __s32 i2c_smbus_write_quick(int file, __u8 value); //// __s32 i2c_smbus_read_byte(int file); //// __s32 i2c_smbus_write_byte(int file, __u8 value); //// __s32 i2c_smbus_read_byte_data(int file, __u8 command); //// __s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value); //// __s32 i2c_smbus_read_word_data(int file, __u8 command); //// __s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value); //// __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value); //// __s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values); //// __s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length, //// // __u8 *values); //// All these transactions return -1 on failure; you can read errno to see //// what happened. The 'write' transactions return 0 on success; the //// 'read' transactions return the read value, except for read_block, which //// returns the number of values read. The block buffers need not be longer //// than 32 bytes. /////////////////////////////////////////////////////////////////////////////////////////////////////////////// /* // Begin "LT-ified" versions of these functions: // Original Linux prototype: __s32 i2c_smbus_write_quick(int file, __u8 value); // Write a single bit in the R/W bit of the address. Note - we are using 8-bit addresses, // we should probably AND with 0xFE before appending the "value" bit. Also, should we obligate the user // to send a value with a "1" in the LSB, or any nonzero value to assert a 1? int8_t LT_i2c_write_quick(uint8_t address, uint8_t value); // Original Linux prototype: __s32 i2c_smbus_read_byte(int file); // Read a byte, store in "value". int8_t LT_i2c_read_byte(uint8_t address, uint8_t *value); // Original Linux prototype: __s32 i2c_smbus_write_byte(int file, __u8 value); // Write "value" byte to device at "address" int8_t LT_i2c_write_byte(uint8_t address, uint8_t value); // Original Linux prototype: __s32 i2c_smbus_read_byte_data(int file, __u8 command); // Read a byte of data at register specified by "command", store in "value" int8_t LT_i2c_read_byte_data(uint8_t address, uint8_t command, uint8_t *value); // Original Linux prototype: __s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value); // Write a byte of data to register specified by "command" int8_t LT_i2c_write_byte_data(uint8_t address, uint8_t command, uint8_t value); // Original Linux prototype: __s32 i2c_smbus_read_word_data(int file, __u8 command); // Read a 16-bit word of data from register specified by "command" int8_t LT_i2c_read_word_data(uint8_t address, uint8_t command, uint16_t *value); // Original Linux prototype: __s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value); // Write a 16-bit word of data to register specified by "command" int8_t LT_i2c_write_word_data(uint8_t address, uint8_t command, uint16_t value); // Original Linux prototype: __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value); int8_t LT_i2c_process_call(uint8_t address, uint8_t command, uint16_t value); // For block read / write, this explains the lack of length parameter in some versions: // "Until kernel 2.6.22, the length is hard coded to 32 bytes. If you // ask for less than 32 bytes, your code will only work with kernels // 2.6.23 and later." // Original Linux prototype: __s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values); // Read a block of data, starting at register specified by "command" and ending at (command + length - 1) int8_t LT_i2c_read_block_data(uint8_t address, uint8_t command, uint8_t length, uint8_t *values); // Original Linux prototype: __s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length, __u8 *values); // Write a block of data, starting at register specified by "command" and ending at (command + length - 1) int8_t LT_i2c_write_block_data(uint8_t address, uint8_t command, uint8_t length, uint8_t *values); // Proposed additional function to handle cases like the LTC2495 / 97 / 99 family, which require // a 16-bit command, and can return either 3 or 4 bytes of data. // Write a two command bytes, then receive a block of data int8_t LT_i2c_two_byte_command_read_block(uint8_t address, uint16_t command, uint8_t length, uint8_t *values); */ #endif // LT_I2C_H