/******************************************************************************** Header file for the USI TWI Slave driver. Created by Donald R. Blake donblake at worldnet.att.net --------------------------------------------------------------------------------- Created from Atmel source files for Application Note AVR312: Using the USI Module as an I2C slave. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program 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 General Public License for more details. --------------------------------------------------------------------------------- Change Activity: Date Description ------ ------------- 15 Mar 2007 Created. ********************************************************************************/ #ifndef _USI_TWI_SLAVE_H_ #define _USI_TWI_SLAVE_H_ /******************************************************************************** includes ********************************************************************************/ #include /******************************************************************************** prototypes ********************************************************************************/ void usiTwiSlaveInit( uint8_t ); void usiTwiTransmitByte( uint8_t ); uint8_t usiTwiReceiveByte( void ); bool usiTwiDataInReceiveBuffer( void ); void (*_onTwiDataRequest)(void); bool usiTwiDataInTransmitBuffer(void); uint8_t usiTwiAmountDataInReceiveBuffer(void); // on_XXX handler pointers void (*usi_onRequestPtr)(void); void (*usi_onReceiverPtr)(uint8_t); /******************************************************************************** driver buffer definitions ********************************************************************************/ // permitted RX buffer sizes: 1, 2, 4, 8, 16, 32, 64, 128 or 256 #ifndef TWI_RX_BUFFER_SIZE #define TWI_RX_BUFFER_SIZE ( 16 ) #endif #define TWI_RX_BUFFER_MASK ( TWI_RX_BUFFER_SIZE - 1 ) #if ( TWI_RX_BUFFER_SIZE & TWI_RX_BUFFER_MASK ) # error TWI RX buffer size is not a power of 2 #endif // permitted TX buffer sizes: 1, 2, 4, 8, 16, 32, 64, 128 or 256 #ifndef TWI_TX_BUFFER_SIZE #define TWI_TX_BUFFER_SIZE ( 16 ) #endif #define TWI_TX_BUFFER_MASK ( TWI_TX_BUFFER_SIZE - 1 ) #if ( TWI_TX_BUFFER_SIZE & TWI_TX_BUFFER_MASK ) # error TWI TX buffer size is not a power of 2 #endif #endif // ifndef _USI_TWI_SLAVE_H_