qmk_firmware/keyboards/handwired/dactyl/i2cmaster.h

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Handwired/Dactyl keyboard (#2058) * Copy the ergodox_ez code to handwired/dactyl Differences from the Ergodox: * Use QMK_SUBPROJECT_H instead of QMK_KEYBOARD_H, since it's under handwired * Omitted several keymaps. They'll eventually be broken (since the Dactyl has fewer keys), and I don't want to try to fix them. * Omitted the keymap images for the default layout, since they depict a different keyboard. * Everything that said Ergodox now says Dactyl, naturally. * [whitespace] Delete trailing whitespace My editor does this automatically so it's just gonna keep cropping up... * Cut the dactyl down to the right number of columns (Remember, throughout matrix.c, everything called "row" is really a column, and vice-versa). * Remove LED-related code * Tighten up the Dactyl's build options * Whitespace cleanup in twimaster.c * Hardtabs -> spaces * No more trailing whitespace * Typo fix * Correct the CPU frequency units The Teensy's CPU definitely doesn't run at 16 petahertz... * Restore access to ONEHAND_ENABLE I turned it off in 26d47cb42622d990a7c3335e7fcc151aa3edfbf0 while desperately debugging; I just wanted to ensure it wasn't causing the problem I was seeing. It was not, in fact, causing the problem, so it's back. Also fixed the swap matrix in dactyl.c, since it still referred to columns that exist in the Ergodox but not the Dactyl. * Clearer phrasing about TWI's effect on scan rate * Fix up the Dactyl's firmware-loading instructions Sadly, the Dactyl has no hole for the onboard reset button. * Dvorak keymap for the Dactyl * The Erincalling Layout * Erincalling layout: Add a := key I've been working in Go, which uses := a lot, and it's awkward to type in this layout. * Dactyl README: link to the dactyl-keyboard repo * Add a missing copyright line I don't know how much this matters? Honestly, it's enough for me that my name is on the git commit. But hey, let's be consistent until there's a specific reason not to be, right? * Dactyl: remove commented-out code I hate it I hate it I hate it There's not even any information about what it was trying to do!!!! >:( * Add a note about the row/column ridiculousness * [whitespace] realign some constants * Don't claim B4 is tied to VCC It doesn't matter at all? I honestly don't know what the reason ever was. It looks like it dates back to the original ErgoDox and I've never seen one sentence about the purpose. I've been skipping that wire for some time, and I promise it works fine. * Dactyl keymaps: Send RALT for right-hand alt key Not terribly important but I just like things tidy OK * typo fix * Refer to "dactyl.h" explicitly QMK_SUBPROJECT_H has been working locally, but fails in CI. Strange! * Dactyl: Don't use QMK_SUBPROJECT_H at all It's still breaking in CI, even though it was a never a problem locally.
2017-11-26 07:18:59 +00:00
#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