4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2003, 2004, 2006, 2008 Develer S.r.l. (http://www.develer.com/)
30 * Copyright 2000 Bernie Innocenti <bernie@codewiz.org>
31 * All Rights Reserved.
34 * \brief Macro for I2C bitbang operation.
38 * \author Francesco Sacchi <batt@develer.com>
41 #ifndef HW_I2C_BITBANG_H
42 #define HW_I2C_BITBANG_H
44 #define SDA_HI do { /* Implement me:Set SDA High by setting SDA pin as input */ } while (0)
45 #define SDA_LO do { /* Implement me:Set SDA Low by setting SDA pin as open collector output */ } while (0)
46 #define SCL_HI do { /* Implement me:Set SCL High by setting SCL pin as input */ } while (0)
47 #define SCL_LO do { /* Implement me:Set SCL Low by setting SCL pin as open collector output */ } while (0)
50 #define SCL_IN (true) /* Implement me: read SDA pin state */
51 #define SDA_IN (true) /* Implement me: read SCL pin state */
54 * This macro should set SDA and SCL lines as input.
56 #define I2C_BITBANG_HW_INIT do { /* Implement me! */ } while (0)
59 * Half bit delay routine used to generate the correct timings.
61 #define I2C_HALFBIT_DELAY() do { /* Implement me! */ } while (0)
67 #include <cfg/compiler.h>
69 #include <cfg/macros.h>
70 #include <drv/timer.h>
75 INLINE void i2c_sdaHi(int dev)
78 /* Implement me:Set SDA High by setting SDA pin as input */
82 INLINE void i2c_sdaLo(int dev)
85 /* Implement me:Set SDA Low by setting SDA pin as open collector output */
89 INLINE void i2c_sclHi(int dev)
92 /* Implement me:Set SCL High by setting SCL pin as input */
96 INLINE void i2c_sclLo(int dev)
99 /* Implement me:Set SCL Low by setting SCL pin as open collector output */
103 INLINE bool i2c_sdaIn(int dev)
106 /* Implement me: read SDA pin state */
107 return (PIOA_PDSR & BV(SDA));
110 INLINE bool i2c_sclIn(int dev)
113 /* Implement me: read SCL pin state */
114 return (PIOA_PDSR & BV(SCL));
118 * Half bit delay routine used to generate the correct timings.
120 INLINE void i2c_halfbitDelay(int dev)
128 * This macro should set SDA and SCL lines as input.
130 INLINE void i2c_bitbangInit(int dev)
133 PIOA_ODR = BV(SDA) | BV (SCL);
134 PIOA_CODR = BV(SDA) | BV (SCL);
135 PIOA_PUER = BV(SDA) | BV (SCL);
138 #endif /* HW_I2C_BITBANG_H */