Simple single-color 8x8x8 LED Cube with AVRs
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  1. #ifndef _I2CMASTER_H
  2. #define _I2CMASTER_H 1
  3. /*************************************************************************
  4. * Title: C include file for the I2C master interface
  5. * (i2cmaster.S or twimaster.c)
  6. * Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
  7. * File: $Id: i2cmaster.h,v 1.10 2005/03/06 22:39:57 Peter Exp $
  8. * Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
  9. * Target: any AVR device
  10. * Usage: see Doxygen manual
  11. **************************************************************************/
  12. #if (__GNUC__ * 100 + __GNUC_MINOR__) < 304
  13. #error "This library requires AVR-GCC 3.4 or later, update to newer AVR-GCC compiler !"
  14. #endif
  15. #include <avr/io.h>
  16. /** defines the data direction (reading from I2C device) in i2c_start(),i2c_rep_start() */
  17. #define I2C_READ 1
  18. /** defines the data direction (writing to I2C device) in i2c_start(),i2c_rep_start() */
  19. #define I2C_WRITE 0
  20. /**
  21. @brief initialize the I2C master interace. Need to be called only once
  22. @param void
  23. @return none
  24. */
  25. extern void i2c_init(void);
  26. /**
  27. @brief Terminates the data transfer and releases the I2C bus
  28. @param void
  29. @return none
  30. */
  31. extern void i2c_stop(void);
  32. /**
  33. @brief Issues a start condition and sends address and transfer direction
  34. @param addr address and transfer direction of I2C device
  35. @retval 0 device accessible
  36. @retval 1 failed to access device
  37. */
  38. extern unsigned char i2c_start(unsigned char addr);
  39. /**
  40. @brief Issues a repeated start condition and sends address and transfer direction
  41. @param addr address and transfer direction of I2C device
  42. @retval 0 device accessible
  43. @retval 1 failed to access device
  44. */
  45. extern unsigned char i2c_rep_start(unsigned char addr);
  46. /**
  47. @brief Issues a start condition and sends address and transfer direction
  48. If device is busy, use ack polling to wait until device ready
  49. @param addr address and transfer direction of I2C device
  50. @return none
  51. */
  52. extern void i2c_start_wait(unsigned char addr);
  53. /**
  54. @brief Send one byte to I2C device
  55. @param data byte to be transfered
  56. @retval 0 write successful
  57. @retval 1 write failed
  58. */
  59. extern unsigned char i2c_write(unsigned char data);
  60. /**
  61. @brief read one byte from the I2C device, request more data from device
  62. @return byte read from I2C device
  63. */
  64. extern unsigned char i2c_readAck(void);
  65. /**
  66. @brief read one byte from the I2C device, read is followed by a stop condition
  67. @return byte read from I2C device
  68. */
  69. extern unsigned char i2c_readNak(void);
  70. /**
  71. @brief read one byte from the I2C device
  72. Implemented as a macro, which calls either i2c_readAck or i2c_readNak
  73. @param ack 1 send ack, request more data from device<br>
  74. 0 send nak, read is followed by a stop condition
  75. @return byte read from I2C device
  76. */
  77. extern unsigned char i2c_read(unsigned char ack);
  78. #define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();
  79. #endif