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/********************************************************************************
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Header file for the USI TWI Slave driver.
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Created by Donald R. Blake
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donblake at worldnet.att.net
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Created from Atmel source files for Application Note AVR312: Using the USI Module
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as an I2C slave.
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This program is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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Change Activity:
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Date Description
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------ -------------
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15 Mar 2007 Created.
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********************************************************************************/
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#ifndef _USI_TWI_SLAVE_H_
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#define _USI_TWI_SLAVE_H_
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/********************************************************************************
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includes
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********************************************************************************/
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#include <stdbool.h>
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/********************************************************************************
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prototypes
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********************************************************************************/
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void usiTwiSlaveInit( uint8_t );
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void usiTwiTransmitByte( uint8_t );
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uint8_t usiTwiReceiveByte( void );
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bool usiTwiDataInReceiveBuffer( void );
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void (*_onTwiDataRequest)(void);
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bool usiTwiDataInTransmitBuffer(void);
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uint8_t usiTwiAmountDataInReceiveBuffer(void);
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// on_XXX handler pointers
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void (*usi_onRequestPtr)(void);
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void (*usi_onReceiverPtr)(uint8_t);
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/********************************************************************************
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driver buffer definitions
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********************************************************************************/
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// permitted RX buffer sizes: 1, 2, 4, 8, 16, 32, 64, 128 or 256
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#ifndef TWI_RX_BUFFER_SIZE
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#define TWI_RX_BUFFER_SIZE ( 16 )
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#endif
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#define TWI_RX_BUFFER_MASK ( TWI_RX_BUFFER_SIZE - 1 )
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#if ( TWI_RX_BUFFER_SIZE & TWI_RX_BUFFER_MASK )
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# error TWI RX buffer size is not a power of 2
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#endif
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// permitted TX buffer sizes: 1, 2, 4, 8, 16, 32, 64, 128 or 256
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#ifndef TWI_TX_BUFFER_SIZE
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#define TWI_TX_BUFFER_SIZE ( 16 )
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#endif
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#define TWI_TX_BUFFER_MASK ( TWI_TX_BUFFER_SIZE - 1 )
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#if ( TWI_TX_BUFFER_SIZE & TWI_TX_BUFFER_MASK )
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# error TWI TX buffer size is not a power of 2
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#endif
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#endif // ifndef _USI_TWI_SLAVE_H_
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