mirror of
https://github.com/nicolai86/ErgoDox-EZ.git
synced 2026-05-06 03:18:58 -07:00
Raphael Randschau
ae746b27b2
the atmega168 acts as the FPGA used in the original ErgoDox EZ shine. It reads the RGBW data via I2C and sets it to the LEDs once all data is received.
124 lines
6.2 KiB
C
Executable File
124 lines
6.2 KiB
C
Executable File
/*****************************************************************************
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*
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* Atmel Corporation
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*
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* File : TWI_Slave.h
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* Compiler : IAR EWAAVR 2.28a/3.10c
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* Revision : $Revision: 2475 $
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* Date : $Date: 2007-09-20 12:00:43 +0200 (to, 20 sep 2007) $
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* Updated by : $Author: mlarsson $
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*
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* Support mail : avr@atmel.com
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*
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* Supported devices : All devices with a TWI module can be used.
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* The example is written for the ATmega16
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*
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* AppNote : AVR311 - TWI Slave Implementation
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*
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* Description : Header file for TWI_slave.c
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* Include this file in the application.
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*
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****************************************************************************/
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/*! \page MISRA
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*
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* General disabling of MISRA rules:
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* * (MISRA C rule 1) compiler is configured to allow extensions
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* * (MISRA C rule 111) bit fields shall only be defined to be of type unsigned int or signed int
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* * (MISRA C rule 37) bitwise operations shall not be performed on signed integer types
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* As it does not work well with 8bit architecture and/or IAR
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* Other disabled MISRA rules
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* * (MISRA C rule 109) use of union - overlapping storage shall not be used
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* * (MISRA C rule 61) every non-empty case clause in a switch statement shall be terminated with a break statement
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*/
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/****************************************************************************
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TWI Status/Control register definitions
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****************************************************************************/
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#ifndef TWI_BUFFER_SIZE
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#define TWI_BUFFER_SIZE 8
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#endif // Reserves memory for the drivers transceiver buffer. \
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// Set this to the largest message size that will be sent including address byte.
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/****************************************************************************
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Global definitions
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****************************************************************************/
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union TWI_statusReg_t // Status byte holding flags.
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{
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unsigned char all;
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struct
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{
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unsigned char lastTransOK : 1;
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unsigned char RxDataInBuf : 1;
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unsigned char genAddressCall : 1; // TRUE = General call, FALSE = TWI Address;
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unsigned char unusedBits : 5;
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};
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};
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extern union TWI_statusReg_t TWI_statusReg;
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static unsigned char dont_sleep = 0;
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/****************************************************************************
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Function definitions
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****************************************************************************/
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void TWI_Slave_Initialise(unsigned char);
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unsigned char TWI_Transceiver_Busy(void);
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unsigned char TWI_Get_State_Info(void);
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void TWI_Start_Transceiver_With_Data(unsigned char *, unsigned char);
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void TWI_Start_Transceiver(void);
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unsigned char TWI_Get_Data_From_Transceiver(unsigned char *, unsigned char);
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/****************************************************************************
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Bit and byte definitions
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****************************************************************************/
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#define TWI_READ_BIT 0 // Bit position for R/W bit in "address byte".
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#define TWI_ADR_BITS 1 // Bit position for LSB of the slave address bits in the init byte.
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#define TWI_GEN_BIT 0 // Bit position for LSB of the general call bit in the init byte.
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#define TRUE 1
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#define FALSE 0
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/****************************************************************************
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TWI State codes
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****************************************************************************/
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// General TWI Master status codes
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#define TWI_START 0x08 // START has been transmitted
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#define TWI_REP_START 0x10 // Repeated START has been transmitted
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#define TWI_ARB_LOST 0x38 // Arbitration lost
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// TWI Master Transmitter status codes
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#define TWI_MTX_ADR_ACK 0x18 // SLA+W has been transmitted and ACK received
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#define TWI_MTX_ADR_NACK 0x20 // SLA+W has been transmitted and NACK received
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#define TWI_MTX_DATA_ACK 0x28 // Data byte has been transmitted and ACK received
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#define TWI_MTX_DATA_NACK 0x30 // Data byte has been transmitted and NACK received
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// TWI Master Receiver status codes
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#define TWI_MRX_ADR_ACK 0x40 // SLA+R has been transmitted and ACK received
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#define TWI_MRX_ADR_NACK 0x48 // SLA+R has been transmitted and NACK received
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#define TWI_MRX_DATA_ACK 0x50 // Data byte has been received and ACK transmitted
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#define TWI_MRX_DATA_NACK 0x58 // Data byte has been received and NACK transmitted
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// TWI Slave Transmitter status codes
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#define TWI_STX_ADR_ACK 0xA8 // Own SLA+R has been received; ACK has been returned
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#define TWI_STX_ADR_ACK_M_ARB_LOST 0xB0 // Arbitration lost in SLA+R/W as Master; own SLA+R has been received; ACK has been returned
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#define TWI_STX_DATA_ACK 0xB8 // Data byte in TWDR has been transmitted; ACK has been received
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#define TWI_STX_DATA_NACK 0xC0 // Data byte in TWDR has been transmitted; NOT ACK has been received
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#define TWI_STX_DATA_ACK_LAST_BYTE 0xC8 // Last data byte in TWDR has been transmitted (TWEA = �0�); ACK has been received
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// TWI Slave Receiver status codes
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#define TWI_SRX_ADR_ACK 0x60 // Own SLA+W has been received ACK has been returned
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#define TWI_SRX_ADR_ACK_M_ARB_LOST 0x68 // Arbitration lost in SLA+R/W as Master; own SLA+W has been received; ACK has been returned
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#define TWI_SRX_GEN_ACK 0x70 // General call address has been received; ACK has been returned
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#define TWI_SRX_GEN_ACK_M_ARB_LOST 0x78 // Arbitration lost in SLA+R/W as Master; General call address has been received; ACK has been returned
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#define TWI_SRX_ADR_DATA_ACK 0x80 // Previously addressed with own SLA+W; data has been received; ACK has been returned
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#define TWI_SRX_ADR_DATA_NACK 0x88 // Previously addressed with own SLA+W; data has been received; NOT ACK has been returned
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#define TWI_SRX_GEN_DATA_ACK 0x90 // Previously addressed with general call; data has been received; ACK has been returned
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#define TWI_SRX_GEN_DATA_NACK 0x98 // Previously addressed with general call; data has been received; NOT ACK has been returned
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#define TWI_SRX_STOP_RESTART 0xA0 // A STOP condition or repeated START condition has been received while still addressed as Slave
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// TWI Miscellaneous status codes
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#define TWI_NO_STATE 0xF8 // No relevant state information available; TWINT = �0�
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#define TWI_BUS_ERROR 0x00 // Bus error due to an illegal START or STOP condition
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