1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/********************************************************************************
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 <stdbool.h>
#include <avr/sleep.h>
/********************************************************************************
prototypes
********************************************************************************/
void usiTwiSlaveInit( uint8_t );
void usiTwiTransmitByte( uint8_t );
uint8_t usiTwiReceiveByte( 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_
|
