Remove leftover old implementations of the lily58 split code. (#12442)

5 files changed, 2 insertions, 1050 deletions

diff --git a/keyboards/lily58/rev1/config.h b/keyboards/lily58/rev1/config.h
index 39b15fc5b..24dc41151 100644
--- a/keyboards/lily58/rev1/config.h
+++ b/keyboards/lily58/rev1/config.h
@@ -35,6 +35,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define MATRIX_ROW_PINS { C6, D7, E6, B4, B5 }
 #define MATRIX_COL_PINS { F6, F7, B1, B3, B2, B6 }
 
+#define SOFT_SERIAL_PIN D2
+#define SERIAL_USE_MULTI_TRANSACTION
 
 /* define if matrix has ghost */
 //#define MATRIX_HAS_GHOST
diff --git a/keyboards/lily58/rev1/matrix.c b/keyboards/lily58/rev1/matrix.c
deleted file mode 100755
index d3ba1c924..000000000
--- a/keyboards/lily58/rev1/matrix.c
+++ /dev/null
@@ -1,357 +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 <string.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 "quantum.h"
-
-#ifdef USE_MATRIX_I2C
-#  include "i2c.h"
-#else // USE_SERIAL
-#  include "split_scomm.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)
-{
-    split_keyboard_setup();
-
-    // initialize row and col
-    unselect_rows();
-    init_cols();
-
-    setPinOutput(B0);
-    setPinOutput(D5);
-    writePinHigh(B0);
-    writePinHigh(D5);
-
-    // 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_MATRIX_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(int master_changed) {
-    int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
-#ifdef SERIAL_USE_MULTI_TRANSACTION
-    int ret=serial_update_buffers(master_changed);
-#else
-    int ret=serial_update_buffers();
-#endif
-    if (ret ) {
-        if(ret==2) writePinLow(B0);
-        return 1;
-    }
-    writePinHigh(B0);
-    memcpy(&matrix[slaveOffset],
-        (void *)serial_slave_buffer, SERIAL_SLAVE_BUFFER_LENGTH);
-    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;
-        memcpy(&matrix[offset],
-               (void *)serial_master_buffer, SERIAL_MASTER_BUFFER_LENGTH);
-        matrix_scan_quantum();
-    }
-    return 1;
-}
-
-
-uint8_t matrix_master_scan(void) {
-
-    int ret = _matrix_scan();
-    int mchanged = 1;
-
-    int offset = (isLeftHand) ? 0 : ROWS_PER_HAND;
-
-#ifdef USE_MATRIX_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
-  #ifdef SERIAL_USE_MULTI_TRANSACTION
-    mchanged = memcmp((void *)serial_master_buffer,
-                      &matrix[offset], SERIAL_MASTER_BUFFER_LENGTH);
-  #endif
-    memcpy((void *)serial_master_buffer,
-           &matrix[offset], SERIAL_MASTER_BUFFER_LENGTH);
-#endif
-
-#ifdef USE_MATRIX_I2C
-    if( i2c_transaction() ) {
-#else // USE_SERIAL
-    if( serial_transaction(mchanged) ) {
-#endif
-        // turn on the indicator led when halves are disconnected
-        writePinLow(D5);
-
-        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
-        writePinHigh(D5);
-        error_count = 0;
-    }
-    matrix_scan_quantum();
-    return ret;
-}
-
-void matrix_slave_scan(void) {
-    _matrix_scan();
-
-    int offset = (isLeftHand) ? 0 : ROWS_PER_HAND;
-
-#ifdef USE_MATRIX_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
-  #ifdef SERIAL_USE_MULTI_TRANSACTION
-    int change = 0;
-  #endif
-    for (int i = 0; i < ROWS_PER_HAND; ++i) {
-  #ifdef SERIAL_USE_MULTI_TRANSACTION
-        if( serial_slave_buffer[i] != matrix[offset+i] )
-            change = 1;
-  #endif
-        serial_slave_buffer[i] = matrix[offset+i];
-    }
-  #ifdef SERIAL_USE_MULTI_TRANSACTION
-    slave_buffer_change_count += change;
-  #endif
-#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++) {
-        print_hex8(row); print(": ");
-        print_bin_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);
-}
diff --git a/keyboards/lily58/rev1/serial_config.h b/keyboards/lily58/rev1/serial_config.h
deleted file mode 100755
index 4fab8e8dd..000000000
--- a/keyboards/lily58/rev1/serial_config.h
+++ /dev/null
@@ -1,4 +0,0 @@
-#ifndef SOFT_SERIAL_PIN
-#define SOFT_SERIAL_PIN D2
-#define SERIAL_USE_MULTI_TRANSACTION
-#endif
diff --git a/keyboards/lily58/rev1/split_util.c b/keyboards/lily58/rev1/split_util.c
deleted file mode 100755
index 316c1c389..000000000
--- a/keyboards/lily58/rev1/split_util.c
+++ /dev/null
@@ -1,100 +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"
-#include "wait.h"
-
-#ifdef USE_MATRIX_I2C
-#  include "i2c.h"
-#else
-#  include "split_scomm.h"
-#endif
-
-#ifndef SPLIT_USB_TIMEOUT
-#    define SPLIT_USB_TIMEOUT 2500
-#endif
-
-volatile bool isLeftHand = true;
-
-bool waitForUsb(void) {
-    for (uint8_t i = 0; i < (SPLIT_USB_TIMEOUT / 100); i++) {
-        // This will return true of a USB connection has been established
-        if (UDADDR & _BV(ADDEN)) {
-            return true;
-        }
-        wait_ms(100);
-    }
-
-    // Avoid NO_USB_STARTUP_CHECK - Disable USB as the previous checks seem to enable it somehow
-    (USBCON &= ~(_BV(USBE) | _BV(OTGPADE)));
-
-    return false;
-}
-
-__attribute__((weak)) bool is_keyboard_left(void) {
-#if defined(SPLIT_HAND_PIN)
-    // Test pin SPLIT_HAND_PIN for High/Low, if low it's right hand
-    setPinInput(SPLIT_HAND_PIN);
-    return readPin(SPLIT_HAND_PIN);
-#elif defined(EE_HANDS)
-    return eeconfig_read_handedness();
-#elif defined(MASTER_RIGHT)
-    return !has_usb();
-#endif
-
-    return has_usb();
-}
-
-__attribute__((weak)) bool has_usb(void) {
-    static enum { UNKNOWN, MASTER, SLAVE } usbstate = UNKNOWN;
-
-    // only check once, as this is called often
-    if (usbstate == UNKNOWN) {
-#if defined(SPLIT_USB_DETECT)
-        usbstate = waitForUsb() ? MASTER : SLAVE;
-#elif defined(__AVR__)
-        USBCON |= (1 << OTGPADE);  // enables VBUS pad
-        wait_us(5);
-
-        usbstate = (USBSTA & (1 << VBUS)) ? MASTER : SLAVE;  // checks state of VBUS
-#else
-        usbstate = MASTER;
-#endif
-    }
-
-    return (usbstate == MASTER);
-}
-
-static void keyboard_master_setup(void) {
-
-#ifdef USE_MATRIX_I2C
-    i2c_master_init();
-#else
-    serial_master_init();
-#endif
-}
-
-static void keyboard_slave_setup(void) {
-
-#ifdef USE_MATRIX_I2C
-    i2c_slave_init(SLAVE_I2C_ADDRESS);
-#else
-    serial_slave_init();
-#endif
-}
-
-void split_keyboard_setup(void) {
-   isLeftHand = is_keyboard_left();
-
-   if (has_usb()) {
-      keyboard_master_setup();
-   } else {
-      keyboard_slave_setup();
-   }
-   sei();
-}
diff --git a/keyboards/lily58/serial.c b/keyboards/lily58/serial.c
deleted file mode 100755
index f6293c3dc..000000000
--- a/keyboards/lily58/serial.c
+++ /dev/null
@@ -1,589 +0,0 @@
-/*
- * WARNING: be careful changing this code, it is very timing dependent
- *
- * 2018-10-28 checked
- *  avr-gcc 4.9.2
- *  avr-gcc 5.4.0
- *  avr-gcc 7.3.0
- */
-
-#ifndef F_CPU
-#define F_CPU 16000000
-#endif
-
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <util/delay.h>
-#include <stddef.h>
-#include <stdbool.h>
-#include "serial.h"
-
-#ifdef SOFT_SERIAL_PIN
-
-#ifdef __AVR_ATmega32U4__
-  // if using ATmega32U4 I2C, can not use PD0 and PD1 in soft serial.
-  #ifdef USE_I2C
-    #if SOFT_SERIAL_PIN == D0 || SOFT_SERIAL_PIN == D1
-      #error Using ATmega32U4 I2C, so can not use PD0, PD1
-    #endif
-  #endif
-
-  #if SOFT_SERIAL_PIN >= D0 && SOFT_SERIAL_PIN <= D3
-    #define SERIAL_PIN_DDR   DDRD
-    #define SERIAL_PIN_PORT  PORTD
-    #define SERIAL_PIN_INPUT PIND
-    #if SOFT_SERIAL_PIN == D0
-      #define SERIAL_PIN_MASK _BV(PD0)
-      #define EIMSK_BIT       _BV(INT0)
-      #define EICRx_BIT       (~(_BV(ISC00) | _BV(ISC01)))
-      #define SERIAL_PIN_INTERRUPT INT0_vect
-    #elif  SOFT_SERIAL_PIN == D1
-      #define SERIAL_PIN_MASK _BV(PD1)
-      #define EIMSK_BIT       _BV(INT1)
-      #define EICRx_BIT       (~(_BV(ISC10) | _BV(ISC11)))
-      #define SERIAL_PIN_INTERRUPT INT1_vect
-    #elif  SOFT_SERIAL_PIN == D2
-      #define SERIAL_PIN_MASK _BV(PD2)
-      #define EIMSK_BIT       _BV(INT2)
-      #define EICRx_BIT       (~(_BV(ISC20) | _BV(ISC21)))
-      #define SERIAL_PIN_INTERRUPT INT2_vect
-    #elif  SOFT_SERIAL_PIN == D3
-      #define SERIAL_PIN_MASK _BV(PD3)
-      #define EIMSK_BIT       _BV(INT3)
-      #define EICRx_BIT       (~(_BV(ISC30) | _BV(ISC31)))
-      #define SERIAL_PIN_INTERRUPT INT3_vect
-    #endif
-  #elif  SOFT_SERIAL_PIN == E6
-    #define SERIAL_PIN_DDR   DDRE
-    #define SERIAL_PIN_PORT  PORTE
-    #define SERIAL_PIN_INPUT PINE
-    #define SERIAL_PIN_MASK  _BV(PE6)
-    #define EIMSK_BIT        _BV(INT6)
-    #define EICRx_BIT        (~(_BV(ISC60) | _BV(ISC61)))
-    #define SERIAL_PIN_INTERRUPT INT6_vect
-  #else
-  #error invalid SOFT_SERIAL_PIN value
-  #endif
-
-#else
- #error serial.c now support ATmega32U4 only
-#endif
-
-//////////////// for backward compatibility ////////////////////////////////
-#ifndef SERIAL_USE_MULTI_TRANSACTION
-/* --- USE Simple API (OLD API, compatible with let's split serial.c) */
-  #if SERIAL_SLAVE_BUFFER_LENGTH > 0
-  uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0};
-  #endif
-  #if SERIAL_MASTER_BUFFER_LENGTH > 0
-  uint8_t volatile serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH] = {0};
-  #endif
-  uint8_t volatile status0 = 0;
-
-SSTD_t transactions[] = {
-    { (uint8_t *)&status0,
-  #if SERIAL_MASTER_BUFFER_LENGTH > 0
-      sizeof(serial_master_buffer), (uint8_t *)serial_master_buffer,
-  #else
-      0, (uint8_t *)NULL,
-  #endif
-  #if SERIAL_SLAVE_BUFFER_LENGTH > 0
-      sizeof(serial_slave_buffer), (uint8_t *)serial_slave_buffer
-  #else
-      0, (uint8_t *)NULL,
-  #endif
-  }
-};
-
-void serial_master_init(void)
-{ soft_serial_initiator_init(transactions, TID_LIMIT(transactions)); }
-
-void serial_slave_init(void)
-{ soft_serial_target_init(transactions, TID_LIMIT(transactions)); }
-
-// 0 => no error
-// 1 => slave did not respond
-// 2 => checksum error
-int serial_update_buffers()
-{
-    int result;
-    result = soft_serial_transaction();
-    return result;
-}
-
-#endif // end of Simple API (OLD API, compatible with let's split serial.c)
-////////////////////////////////////////////////////////////////////////////
-
-#define ALWAYS_INLINE __attribute__((always_inline))
-#define NO_INLINE __attribute__((noinline))
-#define _delay_sub_us(x)    __builtin_avr_delay_cycles(x)
-
-// parity check
-#define ODD_PARITY 1
-#define EVEN_PARITY 0
-#define PARITY EVEN_PARITY
-
-#ifdef SERIAL_DELAY
-  // custom setup in config.h
-  // #define TID_SEND_ADJUST 2
-  // #define SERIAL_DELAY 6             // micro sec
-  // #define READ_WRITE_START_ADJUST 30 // cycles
-  // #define READ_WRITE_WIDTH_ADJUST 8 // cycles
-#else
-// ============ Standard setups ============
-
-#ifndef SELECT_SOFT_SERIAL_SPEED
-#define SELECT_SOFT_SERIAL_SPEED 1
-//  0: about 189kbps
-//  1: about 137kbps (default)
-//  2: about 75kbps
-//  3: about 39kbps
-//  4: about 26kbps
-//  5: about 20kbps
-#endif
-
-#if __GNUC__ < 6
-  #define TID_SEND_ADJUST 14
-#else
-  #define TID_SEND_ADJUST 2
-#endif
-
-#if SELECT_SOFT_SERIAL_SPEED == 0
-  // Very High speed
-  #define SERIAL_DELAY 4             // micro sec
-  #if __GNUC__ < 6
-    #define READ_WRITE_START_ADJUST 33 // cycles
-    #define READ_WRITE_WIDTH_ADJUST 3 // cycles
-  #else
-    #define READ_WRITE_START_ADJUST 34 // cycles
-    #define READ_WRITE_WIDTH_ADJUST 7 // cycles
-  #endif
-#elif SELECT_SOFT_SERIAL_SPEED == 1
-  // High speed
-  #define SERIAL_DELAY 6             // micro sec
-  #if __GNUC__ < 6
-    #define READ_WRITE_START_ADJUST 30 // cycles
-    #define READ_WRITE_WIDTH_ADJUST 3 // cycles
-  #else
-    #define READ_WRITE_START_ADJUST 33 // cycles
-    #define READ_WRITE_WIDTH_ADJUST 7 // cycles
-  #endif
-#elif SELECT_SOFT_SERIAL_SPEED == 2
-  // Middle speed
-  #define SERIAL_DELAY 12            // micro sec
-  #define READ_WRITE_START_ADJUST 30 // cycles
-  #if __GNUC__ < 6
-    #define READ_WRITE_WIDTH_ADJUST 3 // cycles
-  #else
-    #define READ_WRITE_WIDTH_ADJUST 7 // cycles
-  #endif
-#elif SELECT_SOFT_SERIAL_SPEED == 3
-  // Low speed
-  #define SERIAL_DELAY 24            // micro sec
-  #define READ_WRITE_START_ADJUST 30 // cycles
-  #if __GNUC__ < 6
-    #define READ_WRITE_WIDTH_ADJUST 3 // cycles
-  #else
-    #define READ_WRITE_WIDTH_ADJUST 7 // cycles
-  #endif
-#elif SELECT_SOFT_SERIAL_SPEED == 4
-  // Very Low speed
-  #define SERIAL_DELAY 36            // micro sec
-  #define READ_WRITE_START_ADJUST 30 // cycles
-  #if __GNUC__ < 6
-    #define READ_WRITE_WIDTH_ADJUST 3 // cycles
-  #else
-    #define READ_WRITE_WIDTH_ADJUST 7 // cycles
-  #endif
-#elif SELECT_SOFT_SERIAL_SPEED == 5
-  // Ultra Low speed
-  #define SERIAL_DELAY 48            // micro sec
-  #define READ_WRITE_START_ADJUST 30 // cycles
-  #if __GNUC__ < 6
-    #define READ_WRITE_WIDTH_ADJUST 3 // cycles
-  #else
-    #define READ_WRITE_WIDTH_ADJUST 7 // cycles
-  #endif
-#else
-#error invalid SELECT_SOFT_SERIAL_SPEED value
-#endif /* SELECT_SOFT_SERIAL_SPEED */
-#endif /* SERIAL_DELAY */
-
-#define SERIAL_DELAY_HALF1 (SERIAL_DELAY/2)
-#define SERIAL_DELAY_HALF2 (SERIAL_DELAY - SERIAL_DELAY/2)
-
-#define SLAVE_INT_WIDTH_US 1
-#ifndef SERIAL_USE_MULTI_TRANSACTION
-  #define SLAVE_INT_RESPONSE_TIME SERIAL_DELAY
-#else
-  #define SLAVE_INT_ACK_WIDTH_UNIT 2
-  #define SLAVE_INT_ACK_WIDTH 4
-#endif
-
-static SSTD_t *Transaction_table = NULL;
-static uint8_t Transaction_table_size = 0;
-
-inline static void serial_delay(void) ALWAYS_INLINE;
-inline static
-void serial_delay(void) {
-  _delay_us(SERIAL_DELAY);
-}
-
-inline static void serial_delay_half1(void) ALWAYS_INLINE;
-inline static
-void serial_delay_half1(void) {
-  _delay_us(SERIAL_DELAY_HALF1);
-}
-
-inline static void serial_delay_half2(void) ALWAYS_INLINE;
-inline static
-void serial_delay_half2(void) {
-  _delay_us(SERIAL_DELAY_HALF2);
-}
-
-inline static void serial_output(void) ALWAYS_INLINE;
-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) ALWAYS_INLINE;
-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) ALWAYS_INLINE;
-inline static
-uint8_t serial_read_pin(void) {
-  return !!(SERIAL_PIN_INPUT & SERIAL_PIN_MASK);
-}
-
-inline static void serial_low(void) ALWAYS_INLINE;
-inline static
-void serial_low(void) {
-  SERIAL_PIN_PORT &= ~SERIAL_PIN_MASK;
-}
-
-inline static void serial_high(void) ALWAYS_INLINE;
-inline static
-void serial_high(void) {
-  SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
-}
-
-void soft_serial_initiator_init(SSTD_t *sstd_table, int sstd_table_size)
-{
-    Transaction_table = sstd_table;
-    Transaction_table_size = (uint8_t)sstd_table_size;
-    serial_output();
-    serial_high();
-}
-
-void soft_serial_target_init(SSTD_t *sstd_table, int sstd_table_size)
-{
-    Transaction_table = sstd_table;
-    Transaction_table_size = (uint8_t)sstd_table_size;
-    serial_input_with_pullup();
-
-    // Enable INT0-INT3,INT6
-    EIMSK |= EIMSK_BIT;
-#if SERIAL_PIN_MASK == _BV(PE6)
-    // Trigger on falling edge of INT6
-    EICRB &= EICRx_BIT;
-#else
-    // Trigger on falling edge of INT0-INT3
-    EICRA &= EICRx_BIT;
-#endif
-}
-
-// Used by the sender to synchronize timing with the reciver.
-static void sync_recv(void) NO_INLINE;
-static
-void sync_recv(void) {
-  for (uint8_t i = 0; i < SERIAL_DELAY*5 && serial_read_pin(); i++ ) {
-  }
-  // This shouldn't hang if the target disconnects because the
-  // serial line will float to high if the target does disconnect.
-  while (!serial_read_pin());
-}
-
-// Used by the reciver to send a synchronization signal to the sender.
-static void sync_send(void) NO_INLINE;
-static
-void sync_send(void) {
-  serial_low();
-  serial_delay();
-  serial_high();
-}
-
-// Reads a byte from the serial line
-static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) NO_INLINE;
-static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) {
-    uint8_t byte, i, p, pb;
-
-  _delay_sub_us(READ_WRITE_START_ADJUST);
-  for( i = 0, byte = 0, p = PARITY; i < bit; i++ ) {
-      serial_delay_half1();   // read the middle of pulses
-      if( serial_read_pin() ) {
-          byte = (byte << 1) | 1; p ^= 1;
-      } else {
-          byte = (byte << 1) | 0; p ^= 0;
-      }
-      _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
-      serial_delay_half2();
-  }
-  /* recive parity bit */
-  serial_delay_half1();   // read the middle of pulses
-  pb = serial_read_pin();
-  _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
-  serial_delay_half2();
-
-  *pterrcount += (p != pb)? 1 : 0;
-
-  return byte;
-}
-
-// Sends a byte with MSB ordering
-void serial_write_chunk(uint8_t data, uint8_t bit) NO_INLINE;
-void serial_write_chunk(uint8_t data, uint8_t bit) {
-    uint8_t b, p;
-    for( p = PARITY, b = 1<<(bit-1); b ; b >>= 1) {
-        if(data & b) {
-            serial_high(); p ^= 1;
-        } else {
-            serial_low();  p ^= 0;
-        }
-        serial_delay();
-    }
-    /* send parity bit */
-    if(p & 1) { serial_high(); }
-    else      { serial_low(); }
-    serial_delay();
-
-    serial_low(); // sync_send() / senc_recv() need raise edge
-}
-
-static void serial_send_packet(uint8_t *buffer, uint8_t size) NO_INLINE;
-static
-void serial_send_packet(uint8_t *buffer, uint8_t size) {
-  for (uint8_t i = 0; i < size; ++i) {
-    uint8_t data;
-    data = buffer[i];
-    sync_send();
-    serial_write_chunk(data,8);
-  }
-}
-
-static uint8_t serial_recive_packet(uint8_t *buffer, uint8_t size) NO_INLINE;
-static
-uint8_t serial_recive_packet(uint8_t *buffer, uint8_t size) {
-  uint8_t pecount = 0;
-  for (uint8_t i = 0; i < size; ++i) {
-    uint8_t data;
-    sync_recv();
-    data = serial_read_chunk(&pecount, 8);
-    buffer[i] = data;
-  }
-  return pecount == 0;
-}
-
-inline static
-void change_sender2reciver(void) {
-    sync_send();          //0
-    serial_delay_half1(); //1
-    serial_low();         //2
-    serial_input_with_pullup(); //2
-    serial_delay_half1(); //3
-}
-
-inline static
-void change_reciver2sender(void) {
-    sync_recv();     //0
-    serial_delay();  //1
-    serial_low();    //3
-    serial_output(); //3
-    serial_delay_half1(); //4
-}
-
-static inline uint8_t nibble_bits_count(uint8_t bits)
-{
-    bits = (bits & 0x5) + (bits >> 1 & 0x5);
-    bits = (bits & 0x3) + (bits >> 2 & 0x3);
-    return bits;
-}
-
-// interrupt handle to be used by the target device
-ISR(SERIAL_PIN_INTERRUPT) {
-
-#ifndef SERIAL_USE_MULTI_TRANSACTION
-  serial_low();
-  serial_output();
-  SSTD_t *trans = Transaction_table;
-#else
-  // recive transaction table index
-  uint8_t tid, bits;
-  uint8_t pecount = 0;
-  sync_recv();
-  bits = serial_read_chunk(&pecount,7);
-  tid = bits>>3;
-  bits = (bits&7) != nibble_bits_count(tid);
-  if( bits || pecount> 0 || tid > Transaction_table_size ) {
-      return;
-  }
-  serial_delay_half1();
-
-  serial_high(); // response step1 low->high
-  serial_output();
-  _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT*SLAVE_INT_ACK_WIDTH);
-  SSTD_t *trans = &Transaction_table[tid];
-  serial_low(); // response step2 ack high->low
-#endif
-
-  // target send phase
-  if( trans->target2initiator_buffer_size > 0 )
-      serial_send_packet((uint8_t *)trans->target2initiator_buffer,
-                         trans->target2initiator_buffer_size);
-  // target switch to input
-  change_sender2reciver();
-
-  // target recive phase
-  if( trans->initiator2target_buffer_size > 0 ) {
-      if (serial_recive_packet((uint8_t *)trans->initiator2target_buffer,
-                               trans->initiator2target_buffer_size) ) {
-          *trans->status = TRANSACTION_ACCEPTED;
-      } else {
-          *trans->status = TRANSACTION_DATA_ERROR;
-      }
-  } else {
-      *trans->status = TRANSACTION_ACCEPTED;
-  }
-
-  sync_recv(); //weit initiator output to high
-}
-
-/////////
-//  start transaction by initiator
-//
-// int  soft_serial_transaction(int sstd_index)
-//
-// Returns:
-//    TRANSACTION_END
-//    TRANSACTION_NO_RESPONSE
-//    TRANSACTION_DATA_ERROR
-// this code is very time dependent, so we need to disable interrupts
-#ifndef SERIAL_USE_MULTI_TRANSACTION
-int  soft_serial_transaction(void) {
-  SSTD_t *trans = Transaction_table;
-#else
-int  soft_serial_transaction(int sstd_index) {
-  if( sstd_index > Transaction_table_size )
-      return TRANSACTION_TYPE_ERROR;
-  SSTD_t *trans = &Transaction_table[sstd_index];
-#endif
-  cli();
-
-  // signal to the target that we want to start a transaction
-  serial_output();
-  serial_low();
-  _delay_us(SLAVE_INT_WIDTH_US);
-
-#ifndef SERIAL_USE_MULTI_TRANSACTION
-  // wait for the target response
-  serial_input_with_pullup();
-  _delay_us(SLAVE_INT_RESPONSE_TIME);
-
-  // check if the target is present
-  if (serial_read_pin()) {
-    // target failed to pull the line low, assume not present
-    serial_output();
-    serial_high();
-    *trans->status = TRANSACTION_NO_RESPONSE;
-    sei();
-    return TRANSACTION_NO_RESPONSE;
-  }
-
-#else
-  // send transaction table index
-  int tid = (sstd_index<<3) | (7 & nibble_bits_count(sstd_index));
-  sync_send();
-  _delay_sub_us(TID_SEND_ADJUST);
-  serial_write_chunk(tid, 7);
-  serial_delay_half1();
-
-  // wait for the target response (step1 low->high)
-  serial_input_with_pullup();
-  while( !serial_read_pin() ) {
-      _delay_sub_us(2);
-  }
-
-  // check if the target is present (step2 high->low)
-  for( int i = 0; serial_read_pin(); i++ ) {
-      if (i > SLAVE_INT_ACK_WIDTH + 1) {
-          // slave failed to pull the line low, assume not present
-          serial_output();
-          serial_high();
-          *trans->status = TRANSACTION_NO_RESPONSE;
-          sei();
-          return TRANSACTION_NO_RESPONSE;
-      }
-      _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT);
-  }
-#endif
-
-  // initiator recive phase
-  // if the target is present syncronize with it
-  if( trans->target2initiator_buffer_size > 0 ) {
-      if (!serial_recive_packet((uint8_t *)trans->target2initiator_buffer,
-                                trans->target2initiator_buffer_size) ) {
-          serial_output();
-          serial_high();
-          *trans->status = TRANSACTION_DATA_ERROR;
-          sei();
-          return TRANSACTION_DATA_ERROR;
-      }
-   }
-
-  // initiator switch to output
-  change_reciver2sender();
-
-  // initiator send phase
-  if( trans->initiator2target_buffer_size > 0 ) {
-      serial_send_packet((uint8_t *)trans->initiator2target_buffer,
-                         trans->initiator2target_buffer_size);
-  }
-
-  // always, release the line when not in use
-  sync_send();
-
-  *trans->status = TRANSACTION_END;
-  sei();
-  return TRANSACTION_END;
-}
-
-#ifdef SERIAL_USE_MULTI_TRANSACTION
-int soft_serial_get_and_clean_status(int sstd_index) {
-    SSTD_t *trans = &Transaction_table[sstd_index];
-    cli();
-    int retval = *trans->status;
-    *trans->status = 0;;
-    sei();
-    return retval;
-}
-#endif
-
-#endif
-
-// Helix serial.c history
-//   2018-1-29 fork from let's split and add PD2, modify sync_recv() (#2308, bceffdefc)
-//   2018-6-28 bug fix master to slave comm and speed up (#3255, 1038bbef4)
-//             (adjusted with avr-gcc 4.9.2)
-//   2018-7-13 remove USE_SERIAL_PD2 macro (#3374, f30d6dd78)
-//             (adjusted with avr-gcc 4.9.2)
-//   2018-8-11 add support multi-type transaction (#3608, feb5e4aae)
-//             (adjusted with avr-gcc 4.9.2)
-//   2018-10-21 fix serial and RGB animation conflict (#4191, 4665e4fff)
-//             (adjusted with avr-gcc 7.3.0)
-//   2018-10-28 re-adjust compiler depend value of delay (#4269, 8517f8a66)
-//             (adjusted with avr-gcc 5.4.0, 7.3.0)