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example_keyboards
Jack Humbert 8 years ago
parent d707738616
commit ce01f88c43

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@ -29,6 +29,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "util.h"
#include "matrix.h"
#include "i2c.h"
#include "serial.h"
#include "split_util.h"
#include "pro_micro.h"
#include "config.h"

@ -0,0 +1,102 @@
Let's Split
======
This readme and most of the code are from https://github.com/ahtn/tmk_keyboard/
Split keyboard firmware for Arduino Pro Micro or other ATmega32u4
based boards.
Features
--------
Some features supported by the firmware:
* Either half can connect to the computer via USB, or both halves can be used
independently.
* You only need 3 wires to connect the two halves. Two for VCC and GND and one
for serial communication.
* Optional support for I2C connection between the two halves if for some
reason you require a faster connection between the two halves. Note this
requires an extra wire between halves and pull-up resistors on the data lines.
Required Hardware
-----------------
Apart from diodes and key switches for the keyboard matrix in each half, you
will need:
* 2 Arduino Pro Micro's. You can find theses on aliexpress for ≈3.50USD each.
* 2 TRS sockets
* 1 TRS cable.
Alternatively, you can use any sort of cable and socket that has at least 3
wires. If you want to use I2C to communicate between halves, you will need a
cable with at least 4 wires and 2x 4.7kΩ pull-up resistors
Optional Hardware
-----------------
A speaker can be hooked-up to either side to the `5` (`C6`) pin and `GND`, and turned on via `AUDIO_ENABLE`.
Wiring
------
The 3 wires of the TRS cable need to connect GND, VCC, and digital pin 3 (i.e.
PD0 on the ATmega32u4) between the two Pro Micros.
Then wire your key matrix to any of the remaining 17 IO pins of the pro micro
and modify the `matrix.c` accordingly.
The wiring for serial:
![serial wiring](imgs/split-keyboard-serial-schematic.png)
The wiring for i2c:
![i2c wiring](imgs/split-keyboard-i2c-schematic.png)
The pull-up resistors may be placed on either half. It is also possible
to use 4 resistors and have the pull-ups in both halves, but this is
unnecessary in simple use cases.
Notes on Software Configuration
-------------------------------
Configuring the firmware is similar to any other TMK project. One thing
to note is that `MATIX_ROWS` in `config.h` is the total number of rows between
the two halves, i.e. if your split keyboard has 4 rows in each half, then
`MATRIX_ROWS=8`.
Also the current implementation assumes a maximum of 8 columns, but it would
not be very difficult to adapt it to support more if required.
Flashing
--------
If you define `EE_HANDS` in your `config.h`, you will need to set the
EEPROM for the left and right halves. The EEPROM is used to store whether the
half is left handed or right handed. This makes it so that the same firmware
file will run on both hands instead of having to flash left and right handed
versions of the firmware to each half. To flash the EEPROM file for the left
half run:
```
make eeprom-left
```
and similarly for right half
```
make eeprom-right
```
After you have flashed the EEPROM for the first time, you then need to program
the flash memory:
```
make program
```
Note that you need to program both halves, but you have the option of using
different keymaps for each half. You could program the left half with a QWERTY
layout and the right half with a Colemak layout. Then if you connect the left
half to a computer by USB the keyboard will use QWERTY and Colemak when the
right half is connected.

@ -0,0 +1,225 @@
/*
* WARNING: be careful changing this code, it is very timing dependent
*/
#ifndef F_CPU
#define F_CPU 16000000
#endif
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdbool.h>
#include "serial.h"
// Serial pulse period in microseconds. Its probably a bad idea to lower this
// value.
#define SERIAL_DELAY 24
uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0};
uint8_t volatile serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH] = {0};
#define SLAVE_DATA_CORRUPT (1<<0)
volatile uint8_t status = 0;
inline static
void serial_delay(void) {
_delay_us(SERIAL_DELAY);
}
inline static
void serial_output(void) {
SERIAL_PIN_DDR |= SERIAL_PIN_MASK;
}
// make the serial pin an input with pull-up resistor
inline static
void serial_input(void) {
SERIAL_PIN_DDR &= ~SERIAL_PIN_MASK;
SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
}
inline static
uint8_t serial_read_pin(void) {
return !!(SERIAL_PIN_INPUT & SERIAL_PIN_MASK);
}
inline static
void serial_low(void) {
SERIAL_PIN_PORT &= ~SERIAL_PIN_MASK;
}
inline static
void serial_high(void) {
SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
}
void serial_master_init(void) {
serial_output();
serial_high();
}
void serial_slave_init(void) {
serial_input();
// Enable INT0
EIMSK |= _BV(INT0);
// Trigger on falling edge of INT0
EICRA &= ~(_BV(ISC00) | _BV(ISC01));
}
// Used by the master to synchronize timing with the slave.
static
void sync_recv(void) {
serial_input();
// This shouldn't hang if the slave disconnects because the
// serial line will float to high if the slave does disconnect.
while (!serial_read_pin());
serial_delay();
}
// Used by the slave to send a synchronization signal to the master.
static
void sync_send(void) {
serial_output();
serial_low();
serial_delay();
serial_high();
}
// Reads a byte from the serial line
static
uint8_t serial_read_byte(void) {
uint8_t byte = 0;
serial_input();
for ( uint8_t i = 0; i < 8; ++i) {
byte = (byte << 1) | serial_read_pin();
serial_delay();
_delay_us(1);
}
return byte;
}
// Sends a byte with MSB ordering
static
void serial_write_byte(uint8_t data) {
uint8_t b = 8;
serial_output();
while( b-- ) {
if(data & (1 << b)) {
serial_high();
} else {
serial_low();
}
serial_delay();
}
}
// interrupt handle to be used by the slave device
ISR(SERIAL_PIN_INTERRUPT) {
sync_send();
uint8_t checksum = 0;
for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
serial_write_byte(serial_slave_buffer[i]);
sync_send();
checksum += serial_slave_buffer[i];
}
serial_write_byte(checksum);
sync_send();
// wait for the sync to finish sending
serial_delay();
// read the middle of pulses
_delay_us(SERIAL_DELAY/2);
uint8_t checksum_computed = 0;
for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
serial_master_buffer[i] = serial_read_byte();
sync_send();
checksum_computed += serial_master_buffer[i];
}
uint8_t checksum_received = serial_read_byte();
sync_send();
serial_input(); // end transaction
if ( checksum_computed != checksum_received ) {
status |= SLAVE_DATA_CORRUPT;
} else {
status &= ~SLAVE_DATA_CORRUPT;
}
}
inline
bool serial_slave_DATA_CORRUPT(void) {
return status & SLAVE_DATA_CORRUPT;
}
// Copies the serial_slave_buffer to the master and sends the
// serial_master_buffer to the slave.
//
// Returns:
// 0 => no error
// 1 => slave did not respond
int serial_update_buffers(void) {
// this code is very time dependent, so we need to disable interrupts
cli();
// signal to the slave that we want to start a transaction
serial_output();
serial_low();
_delay_us(1);
// wait for the slaves response
serial_input();
serial_high();
_delay_us(SERIAL_DELAY);
// check if the slave is present
if (serial_read_pin()) {
// slave failed to pull the line low, assume not present
sei();
return 1;
}
// if the slave is present syncronize with it
sync_recv();
uint8_t checksum_computed = 0;
// receive data from the slave
for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
serial_slave_buffer[i] = serial_read_byte();
sync_recv();
checksum_computed += serial_slave_buffer[i];
}
uint8_t checksum_received = serial_read_byte();
sync_recv();
if (checksum_computed != checksum_received) {
sei();
return 1;
}
uint8_t checksum = 0;
// send data to the slave
for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
serial_write_byte(serial_master_buffer[i]);
sync_recv();
checksum += serial_master_buffer[i];
}
serial_write_byte(checksum);
sync_recv();
// always, release the line when not in use
serial_output();
serial_high();
sei();
return 0;
}

@ -0,0 +1,26 @@
#ifndef MY_SERIAL_H
#define MY_SERIAL_H
#include "config.h"
#include <stdbool.h>
/* TODO: some defines for interrupt setup */
#define SERIAL_PIN_DDR DDRD
#define SERIAL_PIN_PORT PORTD
#define SERIAL_PIN_INPUT PIND
#define SERIAL_PIN_MASK _BV(PD0)
#define SERIAL_PIN_INTERRUPT INT0_vect
#define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2
#define SERIAL_MASTER_BUFFER_LENGTH 1
// Buffers for master - slave communication
extern volatile uint8_t serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH];
extern volatile uint8_t serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH];
void serial_master_init(void);
void serial_slave_init(void);
int serial_update_buffers(void);
bool serial_slave_data_corrupt(void);
#endif

@ -7,13 +7,22 @@
#include "split_util.h"
#include "matrix.h"
#include "i2c.h"
#include "serial.h"
#include "keyboard.h"
#include "config.h"
volatile bool isLeftHand = true;
static void setup_handedness(void) {
#ifdef EE_HANDS
isLeftHand = eeprom_read_byte(EECONFIG_HANDEDNESS);
#else
#ifdef I2C_MASTER_RIGHT
isLeftHand = !has_usb();
#else
isLeftHand = has_usb();
#endif
#endif
}
static void keyboard_master_setup(void) {

@ -3,8 +3,10 @@
#include <stdbool.h>
#define EECONFIG_BOOTMAGIC_END (uint8_t *)10
#define EECONFIG_HANDEDNESS EECONFIG_BOOTMAGIC_END
#ifdef EE_HANDS
#define EECONFIG_BOOTMAGIC_END (uint8_t *)10
#define EECONFIG_HANDEDNESS EECONFIG_BOOTMAGIC_END
#endif
#define SLAVE_I2C_ADDRESS 0x32

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