~ruther/qmk_firmware

c93093569ecd6024c43e9b0d2e8881e0f768c940 — Joel Challis 5 years ago fb6f581 
Refactor mint60 to use split_common (#8084)
patch browse .tar.gz 
13 files changed, 13 insertions(+), 1072 deletions(-)

M keyboards/mint60/config.h
D keyboards/mint60/i2c.c
D keyboards/mint60/i2c.h
M keyboards/mint60/keymaps/default/keymap.c
D keyboards/mint60/matrix.c
M keyboards/mint60/mint60.c
M keyboards/mint60/mint60.h
M keyboards/mint60/rules.mk
D keyboards/mint60/serial.c
D keyboards/mint60/serial.h
D keyboards/mint60/serial_config.h
D keyboards/mint60/split_util.c
D keyboards/mint60/split_util.h

M keyboards/mint60/config.h => keyboards/mint60/config.h +5 -6
@@ 18,7 18,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
#pragma once

#include "config_common.h"
#include <serial_config.h>

/* USB Device descriptor parameter */
#define VENDOR_ID       0xFEED


@@ 28,11 27,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
#define PRODUCT         Mint60
#define DESCRIPTION     A row staggered split keyboard

#define TAPPING_FORCE_HOLD
#define TAPPING_TERM 100

#define USE_SERIAL

/* key matrix size */
#define MATRIX_ROWS 10
#define MATRIX_COLS 8


@@ 54,6 48,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
/* COL2ROW, ROW2COL*/
#define DIODE_DIRECTION COL2ROW

/*
 * Split Keyboard specific options, make sure you have 'SPLIT_KEYBOARD = yes' in your rules.mk, and define SOFT_SERIAL_PIN.
 */
#define SOFT_SERIAL_PIN D2

// #define BACKLIGHT_PIN B7
// #define BACKLIGHT_BREATHING
// #define BACKLIGHT_LEVELS 3


D keyboards/mint60/i2c.c => keyboards/mint60/i2c.c +0 -162
@@ 1,162 0,0 @@
#include <util/twi.h>
#include <avr/io.h>
#include <stdlib.h>
#include <avr/interrupt.h>
#include <util/twi.h>
#include <stdbool.h>
#include "i2c.h"

#ifdef USE_I2C

// Limits the amount of we wait for any one i2c transaction.
// Since were running SCL line 100kHz (=> 10μs/bit), and each transactions is
// 9 bits, a single transaction will take around 90μs to complete.
//
// (F_CPU/SCL_CLOCK)  =>  # of μC cycles to transfer a bit
// poll loop takes at least 8 clock cycles to execute
#define I2C_LOOP_TIMEOUT (9+1)*(F_CPU/SCL_CLOCK)/8

#define BUFFER_POS_INC() (slave_buffer_pos = (slave_buffer_pos+1)%SLAVE_BUFFER_SIZE)

volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];

static volatile uint8_t slave_buffer_pos;
static volatile bool slave_has_register_set = false;

// Wait for an i2c operation to finish
inline static
void i2c_delay(void) {
  uint16_t lim = 0;
  while(!(TWCR & (1<<TWINT)) && lim < I2C_LOOP_TIMEOUT)
    lim++;

  // easier way, but will wait slightly longer
  // _delay_us(100);
}

// Setup twi to run at 100kHz or 400kHz (see ./i2c.h SCL_CLOCK)
void i2c_master_init(void) {
  // no prescaler
  TWSR = 0;
  // Set TWI clock frequency to SCL_CLOCK. Need TWBR>10.
  // Check datasheets for more info.
  TWBR = ((F_CPU/SCL_CLOCK)-16)/2;
}

// Start a transaction with the given i2c slave address. The direction of the
// transfer is set with I2C_READ and I2C_WRITE.
// returns: 0 => success
//          1 => error
uint8_t i2c_master_start(uint8_t address) {
  TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTA);

  i2c_delay();

  // check that we started successfully
  if ( (TW_STATUS != TW_START) && (TW_STATUS != TW_REP_START))
    return 1;

  TWDR = address;
  TWCR = (1<<TWINT) | (1<<TWEN);

  i2c_delay();

  if ( (TW_STATUS != TW_MT_SLA_ACK) && (TW_STATUS != TW_MR_SLA_ACK) )
    return 1; // slave did not acknowledge
  else
    return 0; // success
}


// Finish the i2c transaction.
void i2c_master_stop(void) {
  TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);

  uint16_t lim = 0;
  while(!(TWCR & (1<<TWSTO)) && lim < I2C_LOOP_TIMEOUT)
    lim++;
}

// Write one byte to the i2c slave.
// returns 0 => slave ACK
//         1 => slave NACK
uint8_t i2c_master_write(uint8_t data) {
  TWDR = data;
  TWCR = (1<<TWINT) | (1<<TWEN);

  i2c_delay();

  // check if the slave acknowledged us
  return (TW_STATUS == TW_MT_DATA_ACK) ? 0 : 1;
}

// Read one byte from the i2c slave. If ack=1 the slave is acknowledged,
// if ack=0 the acknowledge bit is not set.
// returns: byte read from i2c device
uint8_t i2c_master_read(int ack) {
  TWCR = (1<<TWINT) | (1<<TWEN) | (ack<<TWEA);

  i2c_delay();
  return TWDR;
}

void i2c_reset_state(void) {
  TWCR = 0;
}

void i2c_slave_init(uint8_t address) {
  TWAR = address << 0; // slave i2c address
  // TWEN  - twi enable
  // TWEA  - enable address acknowledgement
  // TWINT - twi interrupt flag
  // TWIE  - enable the twi interrupt
  TWCR = (1<<TWIE) | (1<<TWEA) | (1<<TWINT) | (1<<TWEN);
}

ISR(TWI_vect);

ISR(TWI_vect) {
  uint8_t ack = 1;
  switch(TW_STATUS) {
    case TW_SR_SLA_ACK:
      // this device has been addressed as a slave receiver
      slave_has_register_set = false;
      break;

    case TW_SR_DATA_ACK:
      // this device has received data as a slave receiver
      // The first byte that we receive in this transaction sets the location
      // of the read/write location of the slaves memory that it exposes over
      // i2c.  After that, bytes will be written at slave_buffer_pos, incrementing
      // slave_buffer_pos after each write.
      if(!slave_has_register_set) {
        slave_buffer_pos = TWDR;
        // don't acknowledge the master if this memory loctaion is out of bounds
        if ( slave_buffer_pos >= SLAVE_BUFFER_SIZE ) {
          ack = 0;
          slave_buffer_pos = 0;
        }
        slave_has_register_set = true;
      } else {
        i2c_slave_buffer[slave_buffer_pos] = TWDR;
        BUFFER_POS_INC();
      }
      break;

    case TW_ST_SLA_ACK:
    case TW_ST_DATA_ACK:
      // master has addressed this device as a slave transmitter and is
      // requesting data.
      TWDR = i2c_slave_buffer[slave_buffer_pos];
      BUFFER_POS_INC();
      break;

    case TW_BUS_ERROR: // something went wrong, reset twi state
      TWCR = 0;
    default:
      break;
  }
  // Reset everything, so we are ready for the next TWI interrupt
  TWCR |= (1<<TWIE) | (1<<TWINT) | (ack<<TWEA) | (1<<TWEN);
}
#endif


D keyboards/mint60/i2c.h => keyboards/mint60/i2c.h +0 -49
@@ 1,49 0,0 @@
#ifndef I2C_H
#define I2C_H

#include <stdint.h>

#ifndef F_CPU
#define F_CPU 16000000UL
#endif

#define I2C_READ 1
#define I2C_WRITE 0

#define I2C_ACK 1
#define I2C_NACK 0

#define SLAVE_BUFFER_SIZE 0x10

// i2c SCL clock frequency 400kHz
#define SCL_CLOCK  400000L

extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];

void i2c_master_init(void);
uint8_t i2c_master_start(uint8_t address);
void i2c_master_stop(void);
uint8_t i2c_master_write(uint8_t data);
uint8_t i2c_master_read(int);
void i2c_reset_state(void);
void i2c_slave_init(uint8_t address);


static inline unsigned char i2c_start_read(unsigned char addr) {
  return i2c_master_start((addr << 1) | I2C_READ);
}

static inline unsigned char i2c_start_write(unsigned char addr) {
  return i2c_master_start((addr << 1) | I2C_WRITE);
}

// from SSD1306 scrips
extern unsigned char i2c_rep_start(unsigned char addr);
extern void i2c_start_wait(unsigned char addr);
extern unsigned char i2c_readAck(void);
extern unsigned char i2c_readNak(void);
extern unsigned char i2c_read(unsigned char ack);

#define i2c_read(ack)  (ack) ? i2c_readAck() : i2c_readNak();

#endif


M keyboards/mint60/keymaps/default/keymap.c => keyboards/mint60/keymaps/default/keymap.c +0 -28
@@ 14,22 14,11 @@
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include QMK_KEYBOARD_H
#ifdef PROTOCOL_LUFA
#include "lufa.h"
#include "split_util.h"
#endif


#ifdef RGBLIGHT_ENABLE
//Following line allows macro to read current RGB settings
extern rgblight_config_t rgblight_config;
#endif

enum custom_keycodes {
  RGBRST = SAFE_RANGE
};


const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [0] = LAYOUT( \
    KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,      KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,    KC_BSPC,  \


@@ 47,10 36,6 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  )
};

// define variables for reactive RGB
bool TOG_STATUS = false;
int RGB_current_mode;

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  switch (keycode) {
    case RGBRST:


@@ 58,22 43,9 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
        if (record->event.pressed) {
          eeconfig_update_rgblight_default();
          rgblight_enable();
          RGB_current_mode = rgblight_config.mode;
        }
      #endif
      break;
  }
  return true;
}

void matrix_init_user(void) {

}

void matrix_scan_user(void) {

}

void led_set_user(uint8_t usb_led) {

}


D keyboards/mint60/matrix.c => keyboards/mint60/matrix.c +0 -343
@@ 1,343 0,0 @@
/*
Copyright 2012 Jun Wako <wakojun@gmail.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/*
 * scan matrix
 */
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#include "split_util.h"
#include "pro_micro.h"

#ifdef USE_I2C
#  include "i2c.h"
#else // USE_SERIAL
#  include "serial.h"
#endif

#ifndef DEBOUNCE
#  define DEBOUNCE	5
#endif

#define ERROR_DISCONNECT_COUNT 5

static uint8_t debouncing = DEBOUNCE;
static const int ROWS_PER_HAND = MATRIX_ROWS/2;
static uint8_t error_count = 0;
uint8_t is_master = 0 ;

static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
static const uint8_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;

/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];

static matrix_row_t read_cols(void);
static void init_cols(void);
static void unselect_rows(void);
static void select_row(uint8_t row);
static uint8_t matrix_master_scan(void);


__attribute__ ((weak))
void matrix_init_kb(void) {
    matrix_init_user();
}

__attribute__ ((weak))
void matrix_scan_kb(void) {
    matrix_scan_user();
}

__attribute__ ((weak))
void matrix_init_user(void) {
}

__attribute__ ((weak))
void matrix_scan_user(void) {
}

inline
uint8_t matrix_rows(void)
{
    return MATRIX_ROWS;
}

inline
uint8_t matrix_cols(void)
{
    return MATRIX_COLS;
}

void matrix_init(void)
{
    debug_enable = true;
    debug_matrix = true;
    debug_mouse = true;
    // initialize row and col
    unselect_rows();
    init_cols();

    TX_RX_LED_INIT;

    // initialize matrix state: all keys off
    for (uint8_t i=0; i < MATRIX_ROWS; i++) {
        matrix[i] = 0;
        matrix_debouncing[i] = 0;
    }

    is_master = has_usb();

    matrix_init_quantum();
}

uint8_t _matrix_scan(void)
{
    // Right hand is stored after the left in the matirx so, we need to offset it
    int offset = isLeftHand ? 0 : (ROWS_PER_HAND);

    for (uint8_t i = 0; i < ROWS_PER_HAND; i++) {
        select_row(i);
        _delay_us(30);  // without this wait read unstable value.
        matrix_row_t cols = read_cols();
        if (matrix_debouncing[i+offset] != cols) {
            matrix_debouncing[i+offset] = cols;
            debouncing = DEBOUNCE;
        }
        unselect_rows();
    }

    if (debouncing) {
        if (--debouncing) {
            _delay_ms(1);
        } else {
            for (uint8_t i = 0; i < ROWS_PER_HAND; i++) {
                matrix[i+offset] = matrix_debouncing[i+offset];
            }
        }
    }

    return 1;
}

#ifdef USE_I2C

// Get rows from other half over i2c
int i2c_transaction(void) {
    int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;

    int err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
    if (err) goto i2c_error;

    // start of matrix stored at 0x00
    err = i2c_master_write(0x00);
    if (err) goto i2c_error;

    // Start read
    err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ);
    if (err) goto i2c_error;

    if (!err) {
        int i;
        for (i = 0; i < ROWS_PER_HAND-1; ++i) {
            matrix[slaveOffset+i] = i2c_master_read(I2C_ACK);
        }
        matrix[slaveOffset+i] = i2c_master_read(I2C_NACK);
        i2c_master_stop();
    } else {
i2c_error: // the cable is disconnceted, or something else went wrong
        i2c_reset_state();
        return err;
    }

    return 0;
}

#else // USE_SERIAL

int serial_transaction(void) {
    int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
    int ret=serial_update_buffers();
    if (ret ) {
        if(ret==2)RXLED1;
        return 1;
    }
RXLED0;
    for (int i = 0; i < ROWS_PER_HAND; ++i) {
        matrix[slaveOffset+i] = serial_slave_buffer[i];
    }
    return 0;
}
#endif

uint8_t matrix_scan(void)
{
    if (is_master) {
        matrix_master_scan();
    }else{
        matrix_slave_scan();

          int offset = (isLeftHand) ? ROWS_PER_HAND : 0;

          for (int i = 0; i < ROWS_PER_HAND; ++i) {
              matrix[offset+i] = serial_master_buffer[i];
          }

        matrix_scan_quantum();
    }
    return 1;
}


uint8_t matrix_master_scan(void) {

    int ret = _matrix_scan();

#ifndef KEYBOARD_helix_rev1
    int offset = (isLeftHand) ? 0 : ROWS_PER_HAND;

#ifdef USE_I2C
//    for (int i = 0; i < ROWS_PER_HAND; ++i) {
        /* i2c_slave_buffer[i] = matrix[offset+i]; */
//        i2c_slave_buffer[i] = matrix[offset+i];
//    }
#else // USE_SERIAL
    for (int i = 0; i < ROWS_PER_HAND; ++i) {
        serial_master_buffer[i] = matrix[offset+i];
    }
#endif
#endif

#ifdef USE_I2C
    if( i2c_transaction() ) {
#else // USE_SERIAL
    if( serial_transaction() ) {
#endif
        // turn on the indicator led when halves are disconnected
        TXLED1;

        error_count++;

        if (error_count > ERROR_DISCONNECT_COUNT) {
            // reset other half if disconnected
            int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
            for (int i = 0; i < ROWS_PER_HAND; ++i) {
                matrix[slaveOffset+i] = 0;
            }
        }
    } else {
        // turn off the indicator led on no error
        TXLED0;
        error_count = 0;
    }
    matrix_scan_quantum();
    return ret;
}

void matrix_slave_scan(void) {
    _matrix_scan();

    int offset = (isLeftHand) ? 0 : ROWS_PER_HAND;

#ifdef USE_I2C
    for (int i = 0; i < ROWS_PER_HAND; ++i) {
        /* i2c_slave_buffer[i] = matrix[offset+i]; */
        i2c_slave_buffer[i] = matrix[offset+i];
    }
#else // USE_SERIAL
    for (int i = 0; i < ROWS_PER_HAND; ++i) {
        serial_slave_buffer[i] = matrix[offset+i];
    }
#endif
}

bool matrix_is_modified(void)
{
    if (debouncing) return false;
    return true;
}

inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
    return (matrix[row] & ((matrix_row_t)1<<col));
}

inline
matrix_row_t matrix_get_row(uint8_t row)
{
    return matrix[row];
}

void matrix_print(void)
{
    print("\nr/c 0123456789ABCDEF\n");
    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
        phex(row); print(": ");
        pbin_reverse16(matrix_get_row(row));
        print("\n");
    }
}

uint8_t matrix_key_count(void)
{
    uint8_t count = 0;
    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
        count += bitpop16(matrix[i]);
    }
    return count;
}

static void  init_cols(void)
{
    for(int x = 0; x < MATRIX_COLS; x++) {
        _SFR_IO8((col_pins[x] >> 4) + 1) &=  ~_BV(col_pins[x] & 0xF);
        _SFR_IO8((col_pins[x] >> 4) + 2) |= _BV(col_pins[x] & 0xF);
    }
}

static matrix_row_t read_cols(void)
{
    matrix_row_t result = 0;
    for(int x = 0; x < MATRIX_COLS; x++) {
        result |= (_SFR_IO8(col_pins[x] >> 4) & _BV(col_pins[x] & 0xF)) ? 0 : (1 << x);
    }
    return result;
}

static void unselect_rows(void)
{
    for(int x = 0; x < ROWS_PER_HAND; x++) {
        _SFR_IO8((row_pins[x] >> 4) + 1) &=  ~_BV(row_pins[x] & 0xF);
        _SFR_IO8((row_pins[x] >> 4) + 2) |= _BV(row_pins[x] & 0xF);
    }
}

static void select_row(uint8_t row)
{
    _SFR_IO8((row_pins[row] >> 4) + 1) |=  _BV(row_pins[row] & 0xF);
    _SFR_IO8((row_pins[row] >> 4) + 2) &= ~_BV(row_pins[row] & 0xF);
}


M keyboards/mint60/mint60.c => keyboards/mint60/mint60.c +0 -27
@@ 14,30 14,3 @@
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "mint60.h"

void matrix_init_kb(void) {
	// put your keyboard start-up code here
	// runs once when the firmware starts up

	matrix_init_user();
}

void matrix_scan_kb(void) {
	// put your looping keyboard code here
	// runs every cycle (a lot)

	matrix_scan_user();
}

bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
	// put your per-action keyboard code here
	// runs for every action, just before processing by the firmware

	return process_record_user(keycode, record);
}

void led_set_kb(uint8_t usb_led) {
	// put your keyboard LED indicator (ex: Caps Lock LED) toggling code here

	led_set_user(usb_led);
}


M keyboards/mint60/mint60.h => keyboards/mint60/mint60.h +1 -18
@@ 13,25 13,10 @@
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef MINT60_H
#define MINT60_H
#pragma once

#include "quantum.h"

#ifdef RGBLIGHT_ENABLE
//rgb led driver
#include "ws2812.h"
#endif

#ifdef USE_I2C
#include <stddef.h>
#ifdef __AVR__
  #include <avr/io.h>
  #include <avr/interrupt.h>
#endif
#endif


// This a shortcut to help you visually see your layout.
// The following is an example using the Planck MIT layout
// The first section contains all of the arguments


@@ 55,5 40,3 @@
  { R30, R31, R32, R33, R34, R35, R36, R37 }, \
  { R40, R41, KC_NO, R43, KC_NO, R45, R46, R47 }, \
}

#endif


M keyboards/mint60/rules.mk => keyboards/mint60/rules.mk +7 -12
@@ 14,16 14,17 @@ BOOTLOADER = caterina
# Build Options
#   change yes to no to disable
#
BOOTMAGIC_ENABLE = no      # Virtual DIP switch configuration
MOUSEKEY_ENABLE = no       # Mouse keys
EXTRAKEY_ENABLE = no       # Audio control and System control
CONSOLE_ENABLE = no        # Console for debug
COMMAND_ENABLE = no        # Commands for debug and configuration
BOOTMAGIC_ENABLE = no       # Virtual DIP switch configuration
MOUSEKEY_ENABLE = no        # Mouse keys
EXTRAKEY_ENABLE = no        # Audio control and System control
CONSOLE_ENABLE = no         # Console for debug
COMMAND_ENABLE = no         # Commands for debug and configuration
# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
NKRO_ENABLE = no            # USB Nkey Rollover
BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality on B7 by default
RGBLIGHT_ENABLE = yes       # Enable WS2812 RGB underlight. 
MIDI_ENABLE = no            # MIDI support
UNICODE_ENABLE = no         # Unicode
BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID


@@ 31,10 32,4 @@ AUDIO_ENABLE = no           # Audio output on port C6
FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
HD44780_ENABLE = no 		# Enable support for HD44780 based LCDs

CUSTOM_MATRIX = yes
SRC += i2c.c \
       serial.c \
       matrix.c \
       split_util.c
USE_I2C = yes
RGBLIGHT_ENABLE = yes       # Enable WS2812 RGB underlight. 
SPLIT_KEYBOARD = yes


D keyboards/mint60/serial.c => keyboards/mint60/serial.c +0 -295
@@ 1,295 0,0 @@
/*
 * 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"

#ifdef USE_SERIAL

#define _delay_sub_us(x)    __builtin_avr_delay_cycles(x)

// Serial pulse period in microseconds.
#define SELECT_SERIAL_SPEED 1
#if SELECT_SERIAL_SPEED == 0
  // Very High speed
  #define SERIAL_DELAY 4             // micro sec
  #define READ_WRITE_START_ADJUST 30 // cycles
  #define READ_WRITE_WIDTH_ADJUST 10 // cycles
#elif SELECT_SERIAL_SPEED == 1
  // High speed
  #define SERIAL_DELAY 6             // micro sec
  #define READ_WRITE_START_ADJUST 23 // cycles
  #define READ_WRITE_WIDTH_ADJUST 10 // cycles
#elif SELECT_SERIAL_SPEED == 2
  // Middle speed
  #define SERIAL_DELAY 12            // micro sec
  #define READ_WRITE_START_ADJUST 25 // cycles
  #define READ_WRITE_WIDTH_ADJUST 10 // cycles
#elif SELECT_SERIAL_SPEED == 3
  // Low speed
  #define SERIAL_DELAY 24            // micro sec
  #define READ_WRITE_START_ADJUST 25 // cycles
  #define READ_WRITE_WIDTH_ADJUST 10 // cycles
#elif SELECT_SERIAL_SPEED == 4
  // Very Low speed
  #define SERIAL_DELAY 50            // micro sec
  #define READ_WRITE_START_ADJUST 25 // cycles
  #define READ_WRITE_WIDTH_ADJUST 10 // cycles
#else
#error Illegal Serial Speed
#endif


#define SERIAL_DELAY_HALF1 (SERIAL_DELAY/2)
#define SERIAL_DELAY_HALF2 (SERIAL_DELAY - SERIAL_DELAY/2)

#define SLAVE_INT_WIDTH 1
#define SLAVE_INT_RESPONSE_TIME SERIAL_DELAY

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_delay_half1(void) {
  _delay_us(SERIAL_DELAY_HALF1);
}

inline static
void serial_delay_half2(void) {
  _delay_us(SERIAL_DELAY_HALF2);
}

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_with_pullup(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_with_pullup();

#if SERIAL_PIN_MASK == _BV(PD0)
  // Enable INT0
  EIMSK |= _BV(INT0);
  // Trigger on falling edge of INT0
  EICRA &= ~(_BV(ISC00) | _BV(ISC01));
#elif SERIAL_PIN_MASK == _BV(PD2)
  // Enable INT2
  EIMSK |= _BV(INT2);
  // Trigger on falling edge of INT2
  EICRA &= ~(_BV(ISC20) | _BV(ISC21));
#else
 #error unknown SERIAL_PIN_MASK value
#endif
}

// Used by the sender to synchronize timing with the reciver.
static
void sync_recv(void) {
  for (int i = 0; i < SERIAL_DELAY*5 && serial_read_pin(); i++ ) {
  }
  // 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());
}

// Used by the reciver to send a synchronization signal to the sender.
static
void sync_send(void) {
  serial_low();
  serial_delay();
  serial_high();
}

// Reads a byte from the serial line
static
uint8_t serial_read_byte(void) {
  uint8_t byte = 0;
  _delay_sub_us(READ_WRITE_START_ADJUST);
  for ( uint8_t i = 0; i < 8; ++i) {
    serial_delay_half1();   // read the middle of pulses
    byte = (byte << 1) | serial_read_pin();
    _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
    serial_delay_half2();
  }
  return byte;
}

// Sends a byte with MSB ordering
static
void serial_write_byte(uint8_t data) {
  uint8_t b = 1<<7;
  while( b ) {
    if(data & b) {
      serial_high();
    } else {
      serial_low();
    }
    b >>= 1;
    serial_delay();
  }
  serial_low(); // sync_send() / senc_recv() need raise edge
}

// interrupt handle to be used by the slave device
ISR(SERIAL_PIN_INTERRUPT) {
  serial_output();

  // slave send phase
  uint8_t checksum = 0;
  for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
    sync_send();
    serial_write_byte(serial_slave_buffer[i]);
    checksum += serial_slave_buffer[i];
  }
  sync_send();
  serial_write_byte(checksum);

  // slave switch to input
  sync_send(); //0
  serial_delay_half1(); //1
  serial_low();         //2
  serial_input_with_pullup(); //2
  serial_delay_half1(); //3

  // slave recive phase
  uint8_t checksum_computed = 0;
  for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
    sync_recv();
    serial_master_buffer[i] = serial_read_byte();
    checksum_computed += serial_master_buffer[i];
  }
  sync_recv();
  uint8_t checksum_received = serial_read_byte();

  if ( checksum_computed != checksum_received ) {
    status |= SLAVE_DATA_CORRUPT;
  } else {
    status &= ~SLAVE_DATA_CORRUPT;
  }

  sync_recv(); //weit master output to high
}

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
// 2 => checksum error
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(SLAVE_INT_WIDTH);

  // wait for the slaves response
  serial_input_with_pullup();
  _delay_us(SLAVE_INT_RESPONSE_TIME);

  // check if the slave is present
  if (serial_read_pin()) {
    // slave failed to pull the line low, assume not present
    serial_output();
    serial_high();
    sei();
    return 1;
  }

  // master recive phase
  // if the slave is present syncronize with it

  uint8_t checksum_computed = 0;
  // receive data from the slave
  for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
    sync_recv();
    serial_slave_buffer[i] = serial_read_byte();
    checksum_computed += serial_slave_buffer[i];
  }
  sync_recv();
  uint8_t checksum_received = serial_read_byte();

  if (checksum_computed != checksum_received) {
    serial_output();
    serial_high();
    sei();
    return 2;
  }

  // master switch to output
  sync_recv(); //0
  serial_delay();  //1
  serial_low();    //3
  serial_output(); // 3
  serial_delay_half1(); //4

  // master send phase
  uint8_t checksum = 0;

  for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
    sync_send();
    serial_write_byte(serial_master_buffer[i]);
    checksum += serial_master_buffer[i];
  }
  sync_send();
  serial_write_byte(checksum);

  // always, release the line when not in use
  sync_send();

  sei();
  return 0;
}

#endif


D keyboards/mint60/serial.h => keyboards/mint60/serial.h +0 -27
@@ 1,27 0,0 @@
#ifndef SOFT_SERIAL_H
#define SOFT_SERIAL_H

#include <stdbool.h>

// ////////////////////////////////////////////
// Need Soft Serial defines in serial_config.h
// ////////////////////////////////////////////
// ex.
//  #define SERIAL_PIN_DDR DDRD
//  #define SERIAL_PIN_PORT PORTD
//  #define SERIAL_PIN_INPUT PIND
//  #define SERIAL_PIN_MASK _BV(PD?)   ?=0,2
//  #define SERIAL_PIN_INTERRUPT INT?_vect  ?=0,2
//  #define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2
//  #define SERIAL_MASTER_BUFFER_LENGTH MATRIX_ROWS/2

// 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 /* SOFT_SERIAL_H */


D keyboards/mint60/serial_config.h => keyboards/mint60/serial_config.h +0 -16
@@ 1,16 0,0 @@
#ifndef SOFT_SERIAL_CONFIG_H
#define SOFT_SERIAL_CONFIG_H

/* Soft Serial defines */
#define SERIAL_PIN_DDR DDRD
#define SERIAL_PIN_PORT PORTD
#define SERIAL_PIN_INPUT PIND
#define SERIAL_PIN_MASK _BV(PD2)
#define SERIAL_PIN_INTERRUPT INT2_vect

#define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2
#define SERIAL_MASTER_BUFFER_LENGTH MATRIX_ROWS/2

//// #error rev2 serial config

#endif /* SOFT_SERIAL_CONFIG_H */


D keyboards/mint60/split_util.c => keyboards/mint60/split_util.c +0 -70
@@ 1,70 0,0 @@
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/power.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <avr/eeprom.h>
#include "split_util.h"
#include "matrix.h"
#include "keyboard.h"

#ifdef USE_I2C
#  include "i2c.h"
#else
#  include "serial.h"
#endif

volatile bool isLeftHand = true;

static void setup_handedness(void) {
  #ifdef EE_HANDS
    isLeftHand = eeprom_read_byte(EECONFIG_HANDEDNESS);
  #else
    // I2C_MASTER_RIGHT is deprecated, use MASTER_RIGHT instead, since this works for both serial and i2c
    #if defined(I2C_MASTER_RIGHT) || defined(MASTER_RIGHT)
      isLeftHand = !has_usb();
    #else
      isLeftHand = has_usb();
    #endif
  #endif
}

static void keyboard_master_setup(void) {

#ifdef USE_I2C
    i2c_master_init();
#else
    serial_master_init();
#endif
}

static void keyboard_slave_setup(void) {

#ifdef USE_I2C
    i2c_slave_init(SLAVE_I2C_ADDRESS);
#else
    serial_slave_init();
#endif
}

bool has_usb(void) {
   USBCON |= (1 << OTGPADE); //enables VBUS pad
   _delay_us(5);
   return (USBSTA & (1<<VBUS));  //checks state of VBUS
}

void split_keyboard_setup(void) {
   setup_handedness();

   if (has_usb()) {
      keyboard_master_setup();
   } else {
      keyboard_slave_setup();
   }
   sei();
}

// this code runs before the usb and keyboard is initialized
void matrix_setup(void) {
    split_keyboard_setup();
}


D keyboards/mint60/split_util.h => keyboards/mint60/split_util.h +0 -19
@@ 1,19 0,0 @@
#ifndef SPLIT_KEYBOARD_UTIL_H
#define SPLIT_KEYBOARD_UTIL_H

#include <stdbool.h>
#include "eeconfig.h"

#define SLAVE_I2C_ADDRESS           0x32

extern volatile bool isLeftHand;

// slave version of matix scan, defined in matrix.c
void matrix_slave_scan(void);

void split_keyboard_setup(void);
bool has_usb(void);

void matrix_master_OLED_init (void);

#endif