images, docks, clean-up [skip ci]
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@ -29,6 +29,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "util.h"
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#include "matrix.h"
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#include "i2c.h"
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#include "serial.h"
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#include "split_util.h"
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#include "pro_micro.h"
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#include "config.h"
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@ -0,0 +1,102 @@
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Let's Split
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======
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This readme and most of the code are from https://github.com/ahtn/tmk_keyboard/
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Split keyboard firmware for Arduino Pro Micro or other ATmega32u4
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based boards.
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Features
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--------
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Some features supported by the firmware:
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* Either half can connect to the computer via USB, or both halves can be used
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independently.
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* You only need 3 wires to connect the two halves. Two for VCC and GND and one
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for serial communication.
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* Optional support for I2C connection between the two halves if for some
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reason you require a faster connection between the two halves. Note this
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requires an extra wire between halves and pull-up resistors on the data lines.
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Required Hardware
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-----------------
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Apart from diodes and key switches for the keyboard matrix in each half, you
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will need:
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* 2 Arduino Pro Micro's. You can find theses on aliexpress for ≈3.50USD each.
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* 2 TRS sockets
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* 1 TRS cable.
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Alternatively, you can use any sort of cable and socket that has at least 3
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wires. If you want to use I2C to communicate between halves, you will need a
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cable with at least 4 wires and 2x 4.7kΩ pull-up resistors
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Optional Hardware
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-----------------
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A speaker can be hooked-up to either side to the `5` (`C6`) pin and `GND`, and turned on via `AUDIO_ENABLE`.
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Wiring
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------
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The 3 wires of the TRS cable need to connect GND, VCC, and digital pin 3 (i.e.
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PD0 on the ATmega32u4) between the two Pro Micros.
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Then wire your key matrix to any of the remaining 17 IO pins of the pro micro
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and modify the `matrix.c` accordingly.
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The wiring for serial:
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![serial wiring](imgs/split-keyboard-serial-schematic.png)
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The wiring for i2c:
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![i2c wiring](imgs/split-keyboard-i2c-schematic.png)
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The pull-up resistors may be placed on either half. It is also possible
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to use 4 resistors and have the pull-ups in both halves, but this is
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unnecessary in simple use cases.
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Notes on Software Configuration
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-------------------------------
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Configuring the firmware is similar to any other TMK project. One thing
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to note is that `MATIX_ROWS` in `config.h` is the total number of rows between
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the two halves, i.e. if your split keyboard has 4 rows in each half, then
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`MATRIX_ROWS=8`.
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Also the current implementation assumes a maximum of 8 columns, but it would
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not be very difficult to adapt it to support more if required.
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Flashing
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--------
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If you define `EE_HANDS` in your `config.h`, you will need to set the
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EEPROM for the left and right halves. The EEPROM is used to store whether the
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half is left handed or right handed. This makes it so that the same firmware
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file will run on both hands instead of having to flash left and right handed
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versions of the firmware to each half. To flash the EEPROM file for the left
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half run:
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```
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make eeprom-left
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```
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and similarly for right half
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```
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make eeprom-right
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```
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After you have flashed the EEPROM for the first time, you then need to program
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the flash memory:
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```
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make program
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```
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Note that you need to program both halves, but you have the option of using
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different keymaps for each half. You could program the left half with a QWERTY
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layout and the right half with a Colemak layout. Then if you connect the left
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half to a computer by USB the keyboard will use QWERTY and Colemak when the
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right half is connected.
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@ -0,0 +1,225 @@
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/*
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* WARNING: be careful changing this code, it is very timing dependent
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*/
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#ifndef F_CPU
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#define F_CPU 16000000
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#endif
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include <stdbool.h>
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#include "serial.h"
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// Serial pulse period in microseconds. Its probably a bad idea to lower this
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// value.
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#define SERIAL_DELAY 24
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uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0};
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uint8_t volatile serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH] = {0};
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#define SLAVE_DATA_CORRUPT (1<<0)
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volatile uint8_t status = 0;
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inline static
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void serial_delay(void) {
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_delay_us(SERIAL_DELAY);
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}
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inline static
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void serial_output(void) {
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SERIAL_PIN_DDR |= SERIAL_PIN_MASK;
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}
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// make the serial pin an input with pull-up resistor
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inline static
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void serial_input(void) {
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SERIAL_PIN_DDR &= ~SERIAL_PIN_MASK;
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SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
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}
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inline static
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uint8_t serial_read_pin(void) {
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return !!(SERIAL_PIN_INPUT & SERIAL_PIN_MASK);
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}
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inline static
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void serial_low(void) {
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SERIAL_PIN_PORT &= ~SERIAL_PIN_MASK;
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}
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inline static
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void serial_high(void) {
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SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
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}
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void serial_master_init(void) {
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serial_output();
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serial_high();
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}
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void serial_slave_init(void) {
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serial_input();
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// Enable INT0
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EIMSK |= _BV(INT0);
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// Trigger on falling edge of INT0
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EICRA &= ~(_BV(ISC00) | _BV(ISC01));
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}
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// Used by the master to synchronize timing with the slave.
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static
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void sync_recv(void) {
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serial_input();
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// This shouldn't hang if the slave disconnects because the
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// serial line will float to high if the slave does disconnect.
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while (!serial_read_pin());
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serial_delay();
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}
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// Used by the slave to send a synchronization signal to the master.
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static
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void sync_send(void) {
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serial_output();
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serial_low();
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serial_delay();
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serial_high();
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}
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// Reads a byte from the serial line
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static
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uint8_t serial_read_byte(void) {
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uint8_t byte = 0;
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serial_input();
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for ( uint8_t i = 0; i < 8; ++i) {
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byte = (byte << 1) | serial_read_pin();
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serial_delay();
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_delay_us(1);
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}
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return byte;
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}
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// Sends a byte with MSB ordering
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static
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void serial_write_byte(uint8_t data) {
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uint8_t b = 8;
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serial_output();
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while( b-- ) {
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if(data & (1 << b)) {
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serial_high();
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} else {
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serial_low();
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}
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serial_delay();
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}
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}
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// interrupt handle to be used by the slave device
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ISR(SERIAL_PIN_INTERRUPT) {
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sync_send();
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uint8_t checksum = 0;
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for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
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serial_write_byte(serial_slave_buffer[i]);
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sync_send();
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checksum += serial_slave_buffer[i];
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}
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serial_write_byte(checksum);
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sync_send();
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// wait for the sync to finish sending
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serial_delay();
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// read the middle of pulses
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_delay_us(SERIAL_DELAY/2);
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uint8_t checksum_computed = 0;
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for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
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serial_master_buffer[i] = serial_read_byte();
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sync_send();
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checksum_computed += serial_master_buffer[i];
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}
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uint8_t checksum_received = serial_read_byte();
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sync_send();
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serial_input(); // end transaction
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if ( checksum_computed != checksum_received ) {
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status |= SLAVE_DATA_CORRUPT;
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} else {
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status &= ~SLAVE_DATA_CORRUPT;
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}
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}
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inline
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bool serial_slave_DATA_CORRUPT(void) {
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return status & SLAVE_DATA_CORRUPT;
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}
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// Copies the serial_slave_buffer to the master and sends the
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// serial_master_buffer to the slave.
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//
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// Returns:
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// 0 => no error
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// 1 => slave did not respond
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int serial_update_buffers(void) {
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// this code is very time dependent, so we need to disable interrupts
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cli();
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// signal to the slave that we want to start a transaction
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serial_output();
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serial_low();
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_delay_us(1);
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// wait for the slaves response
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serial_input();
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serial_high();
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_delay_us(SERIAL_DELAY);
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// check if the slave is present
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if (serial_read_pin()) {
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// slave failed to pull the line low, assume not present
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sei();
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return 1;
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}
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// if the slave is present syncronize with it
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sync_recv();
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uint8_t checksum_computed = 0;
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// receive data from the slave
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for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
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serial_slave_buffer[i] = serial_read_byte();
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sync_recv();
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checksum_computed += serial_slave_buffer[i];
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}
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uint8_t checksum_received = serial_read_byte();
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sync_recv();
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if (checksum_computed != checksum_received) {
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sei();
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return 1;
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}
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uint8_t checksum = 0;
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// send data to the slave
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for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
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serial_write_byte(serial_master_buffer[i]);
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sync_recv();
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checksum += serial_master_buffer[i];
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}
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serial_write_byte(checksum);
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sync_recv();
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// always, release the line when not in use
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serial_output();
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serial_high();
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sei();
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return 0;
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}
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@ -0,0 +1,26 @@
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#ifndef MY_SERIAL_H
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#define MY_SERIAL_H
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#include "config.h"
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#include <stdbool.h>
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/* TODO: some defines for interrupt setup */
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#define SERIAL_PIN_DDR DDRD
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#define SERIAL_PIN_PORT PORTD
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#define SERIAL_PIN_INPUT PIND
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#define SERIAL_PIN_MASK _BV(PD0)
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#define SERIAL_PIN_INTERRUPT INT0_vect
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#define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2
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#define SERIAL_MASTER_BUFFER_LENGTH 1
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// Buffers for master - slave communication
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extern volatile uint8_t serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH];
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extern volatile uint8_t serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH];
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void serial_master_init(void);
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void serial_slave_init(void);
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int serial_update_buffers(void);
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bool serial_slave_data_corrupt(void);
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#endif
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@ -7,13 +7,22 @@
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#include "split_util.h"
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#include "matrix.h"
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#include "i2c.h"
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#include "serial.h"
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#include "keyboard.h"
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#include "config.h"
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volatile bool isLeftHand = true;
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static void setup_handedness(void) {
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#ifdef EE_HANDS
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isLeftHand = eeprom_read_byte(EECONFIG_HANDEDNESS);
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#else
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#ifdef I2C_MASTER_RIGHT
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isLeftHand = !has_usb();
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#else
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isLeftHand = has_usb();
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#endif
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#endif
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}
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static void keyboard_master_setup(void) {
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@ -3,8 +3,10 @@
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#include <stdbool.h>
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#define EECONFIG_BOOTMAGIC_END (uint8_t *)10
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#define EECONFIG_HANDEDNESS EECONFIG_BOOTMAGIC_END
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#ifdef EE_HANDS
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#define EECONFIG_BOOTMAGIC_END (uint8_t *)10
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#define EECONFIG_HANDEDNESS EECONFIG_BOOTMAGIC_END
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#endif
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#define SLAVE_I2C_ADDRESS 0x32
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