NIBObee Library: nibobee/i2cmaster.h Quellcode

NIBObee Library 1.4
00001 /*  BSD-License:
00002 
00003 Copyright (c) 2007 by Nils Springob, nicai-systems, Germany
00004 
00005 All rights reserved.
00006 
00007 Redistribution and use in source and binary forms, with or without modification,
00008 are permitted provided that the following conditions are met:
00009 
00010   * Redistributions of source code must retain the above copyright notice,
00011     this list of conditions and the following disclaimer.
00012   * Redistributions in binary form must reproduce the above copyright notice,
00013     this list of conditions and the following disclaimer in the documentation
00014     and/or other materials provided with the distribution.
00015   * Neither the name nicai-systems nor the names of its contributors may be
00016     used to endorse or promote products derived from this software without
00017     specific prior written permission.
00018 
00019 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00020 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00021 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00022 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
00023 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00024 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00025 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00026 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00027 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00028 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00029 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00030 
00031 */
00032 
00039 #ifndef NIBOBEE_I2CMASTER_H_
00040 #define NIBOBEE_I2CMASTER_H_
00041 
00042 #include <stdint.h>
00043 
00044 #ifdef __cplusplus
00045 extern "C" {
00046 #endif
00047 
00048 #define I2C_BUF_SIZE 0x25
00049 #define NIBO_I2C_TXRX 1
00050 #define I2C_TWBR_INIT 100
00051 
00052 
00053 #ifdef NIBO_I2C_TXRX
00054 
00058 extern volatile uint8_t i2c_tx_size;
00059 
00063 extern volatile uint8_t i2c_rx_size;
00064 
00065 #else
00066 
00070 extern volatile uint8_t i2c_size;
00071 
00072 #endif
00073 
00074 
00078 extern uint8_t i2c_buf[I2C_BUF_SIZE];
00079 
00083 enum {
00084   I2C_BUSY,
00085   I2C_IDLE,
00086   I2C_SUCCESS,
00087   I2C_ERROR=0x10
00088 };
00089 
00093 void i2c_init(void);
00094 
00098 uint8_t i2c_start_transmission(void);
00099 
00103 uint8_t i2c_status(void);
00104 
00105 extern volatile uint8_t i2c_last_TWSR;
00106 extern volatile uint8_t i2c_pos;
00107 
00111 uint8_t i2c_wait_transmission(void);
00112 
00113 #define I2C_TX(ADDR) ((ADDR)<<1)
00114 #define I2C_RX(ADDR) (((ADDR)<<1)+1)
00115 
00116 #ifdef __cplusplus
00117 } // extern "C"
00118 #endif
00119 
00120 #endif // NIBOBEE_I2CMASTER_H_