[Keyboard] drop unused i2c files (#4948)

The Ergodox EZ used to use twimaster.c/i2cmaster.h, but now uses
a standard centralized AVR i2c driver. Drop the now-unused files.

keyboards/ergodox_ez/i2cmaster.h

@@ -1,178 +0,0 @@
-#ifndef _I2CMASTER_H
-#define _I2CMASTER_H   1
-/************************************************************************* 
-* Title:    C include file for the I2C master interface 
-*           (i2cmaster.S or twimaster.c)
-* Author:   Peter Fleury <pfleury@gmx.ch>  http://jump.to/fleury
-* File:     $Id: i2cmaster.h,v 1.10 2005/03/06 22:39:57 Peter Exp $
-* Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
-* Target:   any AVR device
-* Usage:    see Doxygen manual
-**************************************************************************/
-
-#ifdef DOXYGEN
-/**
- @defgroup pfleury_ic2master I2C Master library
- @code #include <i2cmaster.h> @endcode
-  
- @brief I2C (TWI) Master Software Library
-
- Basic routines for communicating with I2C slave devices. This single master 
- implementation is limited to one bus master on the I2C bus. 
-
- This I2c library is implemented as a compact assembler software implementation of the I2C protocol 
- which runs on any AVR (i2cmaster.S) and as a TWI hardware interface for all AVR with built-in TWI hardware (twimaster.c).
- Since the API for these two implementations is exactly the same, an application can be linked either against the
- software I2C implementation or the hardware I2C implementation.
-
- Use 4.7k pull-up resistor on the SDA and SCL pin.
- 
- Adapt the SCL and SDA port and pin definitions and eventually the delay routine in the module 
- i2cmaster.S to your target when using the software I2C implementation ! 
- 
- Adjust the  CPU clock frequence F_CPU in twimaster.c or in the Makfile when using the TWI hardware implementaion.
-
- @note 
-    The module i2cmaster.S is based on the Atmel Application Note AVR300, corrected and adapted 
-    to GNU assembler and AVR-GCC C call interface.
-    Replaced the incorrect quarter period delays found in AVR300 with 
-    half period delays. 
-    
- @author Peter Fleury pfleury@gmx.ch  http://jump.to/fleury
-
- @par API Usage Example
-  The following code shows typical usage of this library, see example test_i2cmaster.c
-
- @code
-
- #include <i2cmaster.h>
-
-
- #define Dev24C02  0xA2      // device address of EEPROM 24C02, see datasheet
-
- int main(void)
- {
-     unsigned char ret;
-
-     i2c_init();                             // initialize I2C library
-
-     // write 0x75 to EEPROM address 5 (Byte Write) 
-     i2c_start_wait(Dev24C02+I2C_WRITE);     // set device address and write mode
-     i2c_write(0x05);                        // write address = 5
-     i2c_write(0x75);                        // write value 0x75 to EEPROM
-     i2c_stop();                             // set stop conditon = release bus
-
-
-     // read previously written value back from EEPROM address 5 
-     i2c_start_wait(Dev24C02+I2C_WRITE);     // set device address and write mode
-
-     i2c_write(0x05);                        // write address = 5
-     i2c_rep_start(Dev24C02+I2C_READ);       // set device address and read mode
-
-     ret = i2c_readNak();                    // read one byte from EEPROM
-     i2c_stop();
-
-     for(;;);
- }
- @endcode
-
-*/
-#endif /* DOXYGEN */
-
-/**@{*/
-
-#if (__GNUC__ * 100 + __GNUC_MINOR__) < 304
-#error "This library requires AVR-GCC 3.4 or later, update to newer AVR-GCC compiler !"
-#endif
-
-#include <avr/io.h>
-
-/** defines the data direction (reading from I2C device) in i2c_start(),i2c_rep_start() */
-#define I2C_READ    1
-
-/** defines the data direction (writing to I2C device) in i2c_start(),i2c_rep_start() */
-#define I2C_WRITE   0
-
-
-/**
- @brief initialize the I2C master interace. Need to be called only once 
- @param  void
- @return none
- */
-extern void i2c_init(void);
-
-
-/** 
- @brief Terminates the data transfer and releases the I2C bus 
- @param void
- @return none
- */
-extern void i2c_stop(void);
-
-
-/** 
- @brief Issues a start condition and sends address and transfer direction 
-  
- @param    addr address and transfer direction of I2C device
- @retval   0   device accessible 
- @retval   1   failed to access device 
- */
-extern unsigned char i2c_start(unsigned char addr);
-
-
-/**
- @brief Issues a repeated start condition and sends address and transfer direction 
-
- @param   addr address and transfer direction of I2C device
- @retval  0 device accessible
- @retval  1 failed to access device
- */
-extern unsigned char i2c_rep_start(unsigned char addr);
-
-
-/**
- @brief Issues a start condition and sends address and transfer direction 
-   
- If device is busy, use ack polling to wait until device ready 
- @param    addr address and transfer direction of I2C device
- @return   none
- */
-extern void i2c_start_wait(unsigned char addr);
-
- 
-/**
- @brief Send one byte to I2C device
- @param    data  byte to be transfered
- @retval   0 write successful
- @retval   1 write failed
- */
-extern unsigned char i2c_write(unsigned char data);
-
-
-/**
- @brief    read one byte from the I2C device, request more data from device 
- @return   byte read from I2C device
- */
-extern unsigned char i2c_readAck(void);
-
-/**
- @brief    read one byte from the I2C device, read is followed by a stop condition 
- @return   byte read from I2C device
- */
-extern unsigned char i2c_readNak(void);
-
-/** 
- @brief    read one byte from the I2C device
- 
- Implemented as a macro, which calls either i2c_readAck or i2c_readNak
- 
- @param    ack 1 send ack, request more data from device<br>
-               0 send nak, read is followed by a stop condition 
- @return   byte read from I2C device
- */
-extern unsigned char i2c_read(unsigned char ack);
-#define i2c_read(ack)  (ack) ? i2c_readAck() : i2c_readNak(); 
-
-
-/**@}*/
-#endif

keyboards/ergodox_ez/twimaster.c

@@ -1,208 +0,0 @@
-/*************************************************************************
-* Title:    I2C master library using hardware TWI interface
-* Author:   Peter Fleury <pfleury@gmx.ch>  http://jump.to/fleury
-* File:     $Id: twimaster.c,v 1.3 2005/07/02 11:14:21 Peter Exp $
-* Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
-* Target:   any AVR device with hardware TWI 
-* Usage:    API compatible with I2C Software Library i2cmaster.h
-**************************************************************************/
-#include <inttypes.h>
-#include <compat/twi.h>
-
-#include <i2cmaster.h>
-
-
-/* define CPU frequency in Mhz here if not defined in Makefile */
-#ifndef F_CPU
-#define F_CPU 16000000UL
-#endif
-
-/* I2C clock in Hz */
-#define SCL_CLOCK  400000L
-
-
-/*************************************************************************
- Initialization of the I2C bus interface. Need to be called only once
-*************************************************************************/
-void i2c_init(void)
-{
-  /* initialize TWI clock
-   * minimal values in Bit Rate Register (TWBR) and minimal Prescaler
-   * bits in the TWI Status Register should give us maximal possible
-   * I2C bus speed - about 444 kHz
-   *
-   * for more details, see 20.5.2 in ATmega16/32 secification
-   */
-  
-  TWSR = 0;     /* no prescaler */
-  TWBR = 10;    /* must be >= 10 for stable operation */
-
-}/* i2c_init */
-
-
-/*************************************************************************	
-  Issues a start condition and sends address and transfer direction.
-  return 0 = device accessible, 1= failed to access device
-*************************************************************************/
-unsigned char i2c_start(unsigned char address)
-{
-    uint8_t   twst;
-
-	// send START condition
-	TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
-
-	// wait until transmission completed
-	while(!(TWCR & (1<<TWINT)));
-
-	// check value of TWI Status Register. Mask prescaler bits.
-	twst = TW_STATUS & 0xF8;
-	if ( (twst != TW_START) && (twst != TW_REP_START)) return 1;
-
-	// send device address
-	TWDR = address;
-	TWCR = (1<<TWINT) | (1<<TWEN);
-
-	// wail until transmission completed and ACK/NACK has been received
-	while(!(TWCR & (1<<TWINT)));
-
-	// check value of TWI Status Register. Mask prescaler bits.
-	twst = TW_STATUS & 0xF8;
-	if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return 1;
-
-	return 0;
-
-}/* i2c_start */
-
-
-/*************************************************************************
- Issues a start condition and sends address and transfer direction.
- If device is busy, use ack polling to wait until device is ready
- 
- Input:   address and transfer direction of I2C device
-*************************************************************************/
-void i2c_start_wait(unsigned char address)
-{
-    uint8_t   twst;
-
-
-    while ( 1 )
-    {
-	    // send START condition
-	    TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
-    
-    	// wait until transmission completed
-    	while(!(TWCR & (1<<TWINT)));
-    
-    	// check value of TWI Status Register. Mask prescaler bits.
-    	twst = TW_STATUS & 0xF8;
-    	if ( (twst != TW_START) && (twst != TW_REP_START)) continue;
-    
-    	// send device address
-    	TWDR = address;
-    	TWCR = (1<<TWINT) | (1<<TWEN);
-    
-    	// wail until transmission completed
-    	while(!(TWCR & (1<<TWINT)));
-    
-    	// check value of TWI Status Register. Mask prescaler bits.
-    	twst = TW_STATUS & 0xF8;
-    	if ( (twst == TW_MT_SLA_NACK )||(twst ==TW_MR_DATA_NACK) ) 
-    	{    	    
-    	    /* device busy, send stop condition to terminate write operation */
-	        TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
-	        
-	        // wait until stop condition is executed and bus released
-	        while(TWCR & (1<<TWSTO));
-	        
-    	    continue;
-    	}
-    	//if( twst != TW_MT_SLA_ACK) return 1;
-    	break;
-     }
-
-}/* i2c_start_wait */
-
-
-/*************************************************************************
- Issues a repeated start condition and sends address and transfer direction 
-
- Input:   address and transfer direction of I2C device
- 
- Return:  0 device accessible
-          1 failed to access device
-*************************************************************************/
-unsigned char i2c_rep_start(unsigned char address)
-{
-    return i2c_start( address );
-
-}/* i2c_rep_start */
-
-
-/*************************************************************************
- Terminates the data transfer and releases the I2C bus
-*************************************************************************/
-void i2c_stop(void)
-{
-    /* send stop condition */
-	TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
-	
-	// wait until stop condition is executed and bus released
-	while(TWCR & (1<<TWSTO));
-
-}/* i2c_stop */
-
-
-/*************************************************************************
-  Send one byte to I2C device
-  
-  Input:    byte to be transfered
-  Return:   0 write successful 
-            1 write failed
-*************************************************************************/
-unsigned char i2c_write( unsigned char data )
-{	
-    uint8_t   twst;
-    
-	// send data to the previously addressed device
-	TWDR = data;
-	TWCR = (1<<TWINT) | (1<<TWEN);
-
-	// wait until transmission completed
-	while(!(TWCR & (1<<TWINT)));
-
-	// check value of TWI Status Register. Mask prescaler bits
-	twst = TW_STATUS & 0xF8;
-	if( twst != TW_MT_DATA_ACK) return 1;
-	return 0;
-
-}/* i2c_write */
-
-
-/*************************************************************************
- Read one byte from the I2C device, request more data from device 
- 
- Return:  byte read from I2C device
-*************************************************************************/
-unsigned char i2c_readAck(void)
-{
-	TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWEA);
-	while(!(TWCR & (1<<TWINT)));    
-
-    return TWDR;
-
-}/* i2c_readAck */
-
-
-/*************************************************************************
- Read one byte from the I2C device, read is followed by a stop condition 
- 
- Return:  byte read from I2C device
-*************************************************************************/
-unsigned char i2c_readNak(void)
-{
-	TWCR = (1<<TWINT) | (1<<TWEN);
-	while(!(TWCR & (1<<TWINT)));
-	
-    return TWDR;
-
-}/* i2c_readNak */