64 lines
2.9 KiB
C
64 lines
2.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006 by Linus Nielsen Feltzing
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef _GEN_I2C_
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#define _GEN_I2C_
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#include <stdbool.h>
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struct i2c_interface
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{
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void (*scl_dir)(bool out); /* Set SCL as input or output */
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void (*sda_dir)(bool out); /* Set SDA as input or output */
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void (*scl_out)(bool high); /* Drive SCL, might sleep on clk stretch */
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void (*sda_out)(bool high); /* Drive SDA */
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bool (*scl_in)(void); /* Read SCL, returns true if high */
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bool (*sda_in)(void); /* Read SDA, returns true if high */
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void (*delay)(int delay); /* Delay for the specified amount */
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/* These are the delays specified in the I2C specification, the
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time pairs to the right are the minimum 100kHz and 400kHz specs */
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int delay_hd_sta; /* START SDA hold (tHD:SDA) 4.0us/0.6us */
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int delay_hd_dat; /* SDA hold (tHD:DAT) 5.0us/0us */
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int delay_su_dat; /* SDA setup (tSU:DAT) 250ns/100ns */
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int delay_su_sto; /* STOP setup (tSU:STO) 4.0us/0.6us */
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int delay_su_sta; /* Rep. START setup (tSU:STA) 4.7us/0.6us */
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int delay_thigh; /* SCL high period (tHIGH) 4.0us/0.6us */
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};
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int i2c_add_node(const struct i2c_interface *iface);
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int i2c_write_data(int bus_index, int bus_address, int address,
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const unsigned char* buf, int count);
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int i2c_read_data(int bus_index, int bus_address, int address,
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unsigned char* buf, int count);
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/* Special function for devices that can appear on I2C bus but do not
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* comply to I2C specification. Such devices include AT88SC6416C crypto
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* memory. To read data from AT88SC6416C, a write I2C transaction starts,
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* 3 bytes are written and then, in the middle of transaction, the device
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* starts sending data.
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*/
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int i2c_write_read_data(int bus_index, int bus_address,
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const unsigned char* buf_write, int count_write,
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unsigned char* buf_read, int count_read);
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#endif /* _GEN_I2C_ */
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