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130 lines
4.1 KiB
C
Executable File
130 lines
4.1 KiB
C
Executable File
/*! \file i2c.h \brief I2C interface using AVR Two-Wire Interface (TWI) hardware. */
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//*****************************************************************************
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//
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// File Name : 'i2c.h'
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// Title : I2C interface using AVR Two-Wire Interface (TWI) hardware
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// Author : Pascal Stang - Copyright (C) 2002-2003
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// Created : 2002.06.25
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// Revised : 2003.03.03
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// Version : 0.9
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// Target MCU : Atmel AVR series
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// Editor Tabs : 4
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//
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// This code is distributed under the GNU Public License
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// which can be found at http://www.gnu.org/licenses/gpl.txt
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//
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//*****************************************************************************
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#ifndef I2C_H
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#define I2C_H
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#include "global.h"
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// include project-specific configuration
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#include "i2cconf.h"
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// TWSR values (not bits)
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// (taken from avr-libc twi.h - thank you Marek Michalkiewicz)
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// Master
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#define TW_START 0x08
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#define TW_REP_START 0x10
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// Master Transmitter
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#define TW_MT_SLA_ACK 0x18
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#define TW_MT_SLA_NACK 0x20
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#define TW_MT_DATA_ACK 0x28
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#define TW_MT_DATA_NACK 0x30
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#define TW_MT_ARB_LOST 0x38
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// Master Receiver
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#define TW_MR_ARB_LOST 0x38
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#define TW_MR_SLA_ACK 0x40
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#define TW_MR_SLA_NACK 0x48
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#define TW_MR_DATA_ACK 0x50
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#define TW_MR_DATA_NACK 0x58
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// Slave Transmitter
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#define TW_ST_SLA_ACK 0xA8
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#define TW_ST_ARB_LOST_SLA_ACK 0xB0
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#define TW_ST_DATA_ACK 0xB8
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#define TW_ST_DATA_NACK 0xC0
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#define TW_ST_LAST_DATA 0xC8
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// Slave Receiver
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#define TW_SR_SLA_ACK 0x60
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#define TW_SR_ARB_LOST_SLA_ACK 0x68
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#define TW_SR_GCALL_ACK 0x70
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#define TW_SR_ARB_LOST_GCALL_ACK 0x78
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#define TW_SR_DATA_ACK 0x80
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#define TW_SR_DATA_NACK 0x88
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#define TW_SR_GCALL_DATA_ACK 0x90
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#define TW_SR_GCALL_DATA_NACK 0x98
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#define TW_SR_STOP 0xA0
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// Misc
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#define TW_NO_INFO 0xF8
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#define TW_BUS_ERROR 0x00
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// defines and constants
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#define TWCR_CMD_MASK 0x0F
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#define TWSR_STATUS_MASK 0xF8
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// return values
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#define I2C_OK 0x00
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#define I2C_ERROR_NODEV 0x01
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// types
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typedef enum
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{
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I2C_IDLE = 0, I2C_BUSY = 1,
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I2C_MASTER_TX = 2, I2C_MASTER_RX = 3,
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I2C_SLAVE_TX = 4, I2C_SLAVE_RX = 5
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} eI2cStateType;
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// functions
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//! Initialize I2C (TWI) interface
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void i2cInit(void);
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//! Set the I2C transaction bitrate (in KHz)
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void i2cSetBitrate(u16 bitrateKHz);
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// I2C setup and configurations commands
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//! Set the local (AVR processor's) I2C device address
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void i2cSetLocalDeviceAddr(u08 deviceAddr, u08 genCallEn);
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//! Set the user function which handles receiving (incoming) data as a slave
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void i2cSetSlaveReceiveHandler(void (*i2cSlaveRx_func)(u08 receiveDataLength, u08* recieveData));
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//! Set the user function which handles transmitting (outgoing) data as a slave
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void i2cSetSlaveTransmitHandler(u08 (*i2cSlaveTx_func)(u08 transmitDataLengthMax, u08* transmitData));
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// Low-level I2C transaction commands
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//! Send an I2C start condition in Master mode
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void i2cSendStart(void);
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//! Send an I2C stop condition in Master mode
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void i2cSendStop(void);
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//! Wait for current I2C operation to complete
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void i2cWaitForComplete(void);
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//! Send an (address|R/W) combination or a data byte over I2C
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void i2cSendByte(u08 data);
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//! Receive a data byte over I2C
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// ackFlag = TRUE if recevied data should be ACK'ed
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// ackFlag = FALSE if recevied data should be NACK'ed
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void i2cReceiveByte(u08 ackFlag);
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//! Pick up the data that was received with i2cReceiveByte()
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u08 i2cGetReceivedByte(void);
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//! Get current I2c bus status from TWSR
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u08 i2cGetStatus(void);
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// high-level I2C transaction commands
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//! send I2C data to a device on the bus
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void i2cMasterSend(u08 deviceAddr, u08 length, u08 *data);
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//! receive I2C data from a device on the bus
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void i2cMasterReceive(u08 deviceAddr, u08 length, u08* data);
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//! send I2C data to a device on the bus (non-interrupt based)
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u08 i2cMasterSendNI(u08 deviceAddr, u08 length, u08* data);
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//! receive I2C data from a device on the bus (non-interrupt based)
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u08 i2cMasterReceiveNI(u08 deviceAddr, u08 length, u08 *data);
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//! Get the current high-level state of the I2C interface
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eI2cStateType i2cGetState(void);
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#endif
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