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Apple IIgs/Standard Keyboard

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This commit is contained in:
Jeffrey Sung 2012-09-17 06:18:24 +09:00
parent f1a64fc959
commit 78bfaed0f5
9 changed files with 690 additions and 0 deletions
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#----------------------------------------------------------------------------
# On command line:
#
# make all = Make software.
#
# make clean = Clean out built project files.
#
# make coff = Convert ELF to AVR COFF.
#
# make extcoff = Convert ELF to AVR Extended COFF.
#
# make program = Download the hex file to the device.
# Please customize your programmer settings(PROGRAM_CMD)
#
# make teensy = Download the hex file to the device, using teensy_loader_cli.
# (must have teensy_loader_cli installed).
#
# make dfu = Download the hex file to the device, using dfu-programmer (must
# have dfu-programmer installed).
#
# make flip = Download the hex file to the device, using Atmel FLIP (must
# have Atmel FLIP installed).
#
# make dfu-ee = Download the eeprom file to the device, using dfu-programmer
# (must have dfu-programmer installed).
#
# make flip-ee = Download the eeprom file to the device, using Atmel FLIP
# (must have Atmel FLIP installed).
#
# make debug = Start either simulavr or avarice as specified for debugging,
# with avr-gdb or avr-insight as the front end for debugging.
#
# make filename.s = Just compile filename.c into the assembler code only.
#
# make filename.i = Create a preprocessed source file for use in submitting
# bug reports to the GCC project.
#
# To rebuild project do "make clean" then "make all".
#----------------------------------------------------------------------------
# Target file name (without extension).
TARGET = IIgs_Standard
# Directory common source filess exist
TOP_DIR = ../..
# Directory keyboard dependent files exist
TARGET_DIR = .
# keyboard dependent files
SRC = keymap.c \
matrix.c \
led.c
CONFIG_H = config.h
# MCU name, you MUST set this to match the board you are using
# type "make clean" after changing this, so all files will be rebuilt
#MCU = at90usb162 # Teensy 1.0
#MCU = atmega32u4 # Teensy 2.0
#MCU = at90usb646 # Teensy++ 1.0
MCU = at90usb1286 # Teensy++ 2.0
# Processor frequency.
# Normally the first thing your program should do is set the clock prescaler,
# so your program will run at the correct speed. You should also set this
# variable to same clock speed. The _delay_ms() macro uses this, and many
# examples use this variable to calculate timings. Do not add a "UL" here.
F_CPU = 16000000
# Build Options
# comment out to disable the options.
#
MOUSEKEY_ENABLE = no # Mouse keys
#PS2_MOUSE_ENABLE = yes # PS/2 mouse(TrackPoint) support
EXTRAKEY_ENABLE = yes # Audio control and System control
#NKRO_ENABLE = yes # USB Nkey Rollover
#---------------- Programming Options --------------------------
PROGRAM_CMD = teensy_loader_cli -mmcu=$(MCU) -w -v $(TARGET).hex
# Search Path
VPATH += $(TARGET_DIR)
VPATH += $(TOP_DIR)
include $(TOP_DIR)/protocol/pjrc.mk
include $(TOP_DIR)/common.mk
include $(TOP_DIR)/rules.mk

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keyboard/IIgs_Standard/README Normal file
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Alternative Controller for Apple IIgs/Standard(M0116)
JeffreySung(nattyman@gmail.com)
===============================
Feature
-------
- Replaceable keyboard controller for Apple IIgs(A9M0330)/Standard(M0116)
- Teensy++ 2.0 required
- Some signal bypass required
- ADB keyboard doesn't use matrix for modifier keys. With virtual row for modifier keys, these keys are merged into key matrix.
- Power key couldn't be used because power key is not connected to controller.
History
=======
- 2012.09.17 First Release
Build
=====
0. Just Type "Make" and return.
Hardware
========
PJRC Teensy
-----------
0. The following ports should not be connected to board.
From top view of Teensy++, from GND and counter clock wise.
-7,26(in keyboard PCB, these pins are VDD,GND)
-30,31(in Teensy++, these pins are Ref,GND respectively)
-5,6(D2,D3 for bluetooth in future)
1. Bypass 31 pin(from board) to E4(Teensy)
2. Bypass 30 pin(from board) to F2(Teensy)
3. Refer doc directory
To Do
=====
0. Caps Lock connect
1. Layer Change by toggling Clear Key
2. Eject Key add. (following files should be modified.)
common/usb_keycodes.h
common/keyboard.c
3. Use bluetooth
EOF

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/*
Copyright 2011 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/>.
*/
#ifndef CONFIG_H
#define CONFIG_H
/* controller configuration */
#include "controller_teensy.h"
/* USB Device descriptor parameter */
/* for Apple
#define VENDOR_ID 0x05AC
#define PRODUCT_ID 0xBEE0
*/
#define VENDOR_ID 0xFEED
#define PRODUCT_ID 0xBEE0
#define DEVICE_VER 0x0202
#define MANUFACTURER t.m.k.
#define PRODUCT Apple Desktop Bus Keyboard
/* message strings */
#define DESCRIPTION Apple M0116/A9M0660 keyboard firmware
/* matrix size */
#define MATRIX_ROWS 11 // last row is virtual for modifier
#define MATRIX_COLS 8
/* define if matrix has ghost */
#define MATRIX_HAS_GHOST
/* Set 0 if need no debouncing */
#define DEBOUNCE 5
/* key combination for command */
#define IS_COMMAND() ( \
keyboard_report->mods == (MOD_BIT(KB_LSHIFT) | MOD_BIT(KB_LCTRL) | MOD_BIT(KB_LALT) | MOD_BIT(KB_LGUI)) || \
keyboard_report->mods == (MOD_BIT(KB_LSHIFT) | MOD_BIT(KB_RSHIFT)) \
)
/* layer switching */
#define LAYER_SWITCH_DELAY 100
#define LAYER_SEND_FN_TERM 300
/* mouse keys */
#ifdef MOUSEKEY_ENABLE
# define MOUSEKEY_DELAY_TIME 192
#endif
#endif

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/*
Copyright 2012 Jeffrey Sung <nattyman@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/>.
*/
/*
* Keymap for Apple IIgs/Standard Keyboard
*/
#include <stdint.h>
#include <stdbool.h>
#include <avr/pgmspace.h>
#include "usb_keycodes.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "keymap.h"
// Convert physical keyboard layout to matrix array.
// This is a macro to define keymap easily in keyboard layout form.
#define KEYMAP( \
R3C7, R3C6, R3C5, R3C4, R3C3, R3C2, R3C1, R8C1, R8C0, R3C0, R0C0, R0C1, R0C2, R0C3, R4C4, R4C5, R4C6, R4C7, \
R9C7, R9C6, R9C5, R9C4, R9C3, R9C2, R9C1, R9C0, R1C0, R1C1, R1C2, R1C3, R1C4, R2C4, R2C5, R2C6, R2C3, \
R10C0,R7C7, R7C6, R7C5, R7C4, R7C3, R7C2, R7C1, R7C0, R0C4, R1C6, R1C7, R1C5, R2C0, R2C1, R2C2, R2C7, \
R10C1,R6C7, R6C6, R6C5, R6C4, R6C3, R6C2, R6C1, R6C0, R0C5, R0C6, R4C0, R4C1, R4C2, \
R10C4,R10C2,R10C3,R5C4, R5C7, R5C5, R5C6, R5C0, R5C2, R0C7, R5C1, R5C3, R4C3 \
) { \
{ R0C0, R0C1, R0C2, R0C3, R0C4, R0C5, R0C6, R0C7 }, \
{ R1C0, R1C1, R1C2, R1C3, R1C4, R1C5, R1C6, R1C7 }, \
{ R2C0, R2C1, R2C2, R2C3, R2C4, R2C5, R2C6, R2C7 }, \
{ R3C0, R3C1, R3C2, R3C3, R3C4, R3C5, R3C6, R3C7 }, \
{ R4C0, R4C1, R4C2, R4C3, R4C4, R4C5, R4C6, R4C7 }, \
{ R5C0, R5C1, R5C2, R5C3, R5C4, R5C5, R5C6, R5C7 }, \
{ R6C0, R6C1, R6C2, R6C3, R6C4, R6C5, R6C6, R6C7 }, \
{ R7C0, R7C1, R7C2, R7C3, R7C4, R7C5, R7C6, R7C7 }, \
{ R8C0, R8C1, KB_NO, KB_NO, KB_NO,KB_NO, KB_NO, KB_NO }, \
{ R9C0, R9C1, R9C2, R9C3, R9C4, R9C5, R9C6, R9C7 }, \
{ R10C0,R10C1, R10C2, R10C3, R10C4,KB_NO, KB_NO, KB_NO} \
}
#define KEYCODE(layer, row, col) (pgm_read_byte(&keymaps[(layer)][(row)][(col)]))
// Assign Fn key(0-7) to a layer to which switch with the Fn key pressed.
static const uint8_t PROGMEM fn_layer[] = {
0, // Fn0
1, // Fn1
2, // Fn2
3, // Fn3
4, // Fn4
0, // Fn5
3, // Fn6
3 // Fn7
};
// Assign Fn key(0-7) to a keycode sent when release Fn key without use of the layer.
// See layer.c for details.
static const uint8_t PROGMEM fn_keycode[] = {
KB_NO, // Fn0
KB_NO, // Fn1
KB_SLSH, // Fn2
KB_SCLN, // Fn3
KB_SPC, // Fn4
KB_NO, // Fn5
KB_NO, // Fn6
KB_NO // Fn7
};
static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
/* Layer 0: Default Layer
* ,-----------------------------------------------------------. ,---------------,
* |Esc| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =|Backsp | |FN0| = | / | * |
* |-----------------------------------------------------------| |---------------|
* |Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]| | | 7 | 8 | 9 | + |
* |-----------------------------------------------------' | |---------------|
* |Contro| A| S| D| F| G| H| J| K| L|Fn3| '|Return | | 4 | 5 | 6 | - |
* |-----------------------------------------------------------| |---------------|
* |Shift | Z| X| C| V| B| N| M| ,| .| / |Shift | | 1 | 2 | 3 | E |
* |-----------------------------------------------------------| |-----------| N |
* |CAPS|Alt |Gui |` |SPC |BSLS |LFT|RGT|DN|UP| | 0 | . | T |
* `-----------------------------------------------------------' |---------------'
*/
KEYMAP(KB_ESC, KB_1, KB_2, KB_3, KB_4, KB_5, KB_6, KB_7, KB_8, KB_9, KB_0, KB_MINS,KB_EQL, KB_BSPC, KB_FN1, KB_PEQL, KB_PSLS, KB_PAST, \
KB_TAB, KB_Q, KB_W, KB_E, KB_R, KB_T, KB_Y, KB_U, KB_I, KB_O, KB_P, KB_LBRC,KB_RBRC, KB_P7, KB_P8, KB_P9, KB_PPLS, \
KB_LCTL,KB_A, KB_S, KB_D, KB_F, KB_G, KB_H, KB_J, KB_K, KB_L, KB_SCLN, KB_QUOT,KB_ENT, KB_P4, KB_P5, KB_P6, KB_PMNS, \
KB_LSFT,KB_Z, KB_X, KB_C, KB_V, KB_B, KB_N, KB_M, KB_COMM,KB_DOT, KB_SLSH, KB_P1, KB_P2, KB_P3, \
KB_CAPS,KB_LALT,KB_LGUI,KB_GRV, KB_SPC, KB_BSLS,KB_LEFT,KB_RGHT,KB_DOWN,KB_UP, KB_P0, KB_PDOT, KB_PENT),
/* Layer 1: Tenkey use Layer
* ,-----------------------------------------------------------. ,---------------,
* |Esc| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =|Backsp | |NLK| = | / | * |
* |-----------------------------------------------------------| |---------------|
* |Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]| | |INS| 8 |PGU|V+ |
* |-----------------------------------------------------' | |---------------|
* |Contro| A| S| D| F| G| H| J| K| L|Fn3| '|Return | |DEL|UP |PGD|V- |
* |-----------------------------------------------------------| |---------------|
* |Shift | Z| X| C| V| B| N| M| ,| .| / |Shift | |LFT|DN |RGT| E |
* |-----------------------------------------------------------| |-----------| N |
* |CAPS|Alt |Gui |` |SPC |BSLS |LFT|RGT|DN|UP| | 0 | . | T |
* `-----------------------------------------------------------' `---------------'
*/
KEYMAP(KB_ESC, KB_1, KB_2, KB_3, KB_4, KB_5, KB_6, KB_7, KB_8, KB_9, KB_0, KB_MINS,KB_EQL, KB_BSPC, KB_FN0, KB_PEQL, KB_PSLS, KB_MUTE, \
KB_TAB, KB_Q, KB_W, KB_E, KB_R, KB_T, KB_Y, KB_U, KB_I, KB_O, KB_P, KB_LBRC,KB_RBRC, KB_INS, KB_P8, KB_PGUP, KB_VOLU, \
KB_LCTL,KB_A, KB_S, KB_D, KB_F, KB_G, KB_H, KB_J, KB_K, KB_L, KB_SCLN, KB_QUOT,KB_ENT, KB_DEL, KB_UP, KB_PGDN, KB_VOLD, \
KB_LSFT,KB_Z, KB_X, KB_C, KB_V, KB_B, KB_N, KB_M, KB_COMM,KB_DOT, KB_SLSH, KB_LEFT, KB_DOWN, KB_RIGHT, \
KB_CAPS,KB_LALT,KB_LGUI,KB_GRV, KB_SPC, KB_BSLS,KB_LEFT,KB_RGHT,KB_DOWN,KB_UP, KB_P0, KB_PDOT, KB_PENT),
};
uint8_t keymap_get_keycode(uint8_t layer, uint8_t row, uint8_t col)
{
return KEYCODE(layer, row, col);
}
uint8_t keymap_fn_layer(uint8_t fn_bits)
{
return pgm_read_byte(&fn_layer[biton(fn_bits)]);
}
uint8_t keymap_fn_keycode(uint8_t fn_bits)
{
return pgm_read_byte(&fn_keycode[(biton(fn_bits))]);
}

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/*
Copyright 2011 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/>.
*/
#include "stdint.h"
#include "led.h"
void led_set(uint8_t usb_led)
{
}

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/*
Copyright 2011 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 <util/delay.h>
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#if (MATRIX_COLS > 16)
# error "MATRIX_COLS must not exceed 16"
#endif
#if (MATRIX_ROWS > 255)
# error "MATRIX_ROWS must not exceed 255"
#endif
#ifndef DEBOUNCE
# define DEBOUNCE 0
#endif
static uint8_t debouncing = DEBOUNCE;
// matrix state buffer(1:on, 0:off)
#if (MATRIX_COLS <= 8)
static uint8_t *matrix;
static uint8_t *matrix_prev;
static uint8_t _matrix0[MATRIX_ROWS];
static uint8_t _matrix1[MATRIX_ROWS];
#else
static uint16_t *matrix;
static uint16_t *matrix_prev;
static uint16_t _matrix0[MATRIX_ROWS];
static uint16_t _matrix1[MATRIX_ROWS];
#endif
#ifdef MATRIX_HAS_GHOST
static bool matrix_has_ghost_in_row(uint8_t row);
#endif
static uint8_t read_col(uint8_t row);
static void unselect_rows(void);
static void select_row(uint8_t row);
inline
uint8_t matrix_rows(void)
{
return MATRIX_ROWS;
}
inline
uint8_t matrix_cols(void)
{
return MATRIX_COLS;
}
void matrix_init(void)
{
// initialize row and col
unselect_rows();
// Input with pull-up(DDR:0, PORT:1)
// Column C1 ~ C7 (PortC0-6)
// Column C0(Port E1)
DDRC &= ~0b01111111;
PORTC |= 0b01111111;
DDRE &= ~0b00000010;
PORTE |= 0b00000010;
// modifier B3/4,F4/5,E4 always input
DDRB |= 0b00011000;
PORTB &= 0b00011000;
DDRF |= ~0b00110000;
PORTF &= 0b00110000;
//DDRB &= ~0b00011000;
//PORTB |= 0b00011000;
//DDRF &= ~0b00110000;
//PORTF |= 0b00110000;
//DDRE &= ~0b00010000;
//PORTE |= 0b00010000;
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
matrix = _matrix0;
matrix_prev = _matrix1;
}
uint8_t matrix_scan(void)
{
if (!debouncing) {
uint8_t *tmp = matrix_prev;
matrix_prev = matrix;
matrix = tmp;
}
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
unselect_rows();
select_row(i);
_delay_us(30); // without this wait read unstable value.
if (matrix[i] != (uint8_t)~read_col(i)) {
matrix[i] = (uint8_t)~read_col(i);
if (debouncing) {
debug("bounce!: "); debug_hex(debouncing); print("\n");
}
debouncing = DEBOUNCE;
}
}
unselect_rows();
if (debouncing) {
debouncing--;
}
return 1;
}
bool matrix_is_modified(void)
{
if (debouncing) return false;
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
if (matrix[i] != matrix_prev[i]) {
return true;
}
}
return false;
}
inline
bool matrix_has_ghost(void)
{
#ifdef MATRIX_HAS_GHOST
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
if (matrix_has_ghost_in_row(i))
return true;
}
#endif
return false;
}
inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
return (matrix[row] & (1<<col));
}
inline
#if (MATRIX_COLS <= 8)
uint8_t matrix_get_row(uint8_t row)
#else
uint16_t matrix_get_row(uint8_t row)
#endif
{
return matrix[row];
}
void matrix_print(void)
{
print("\nr/c 01234567\n");
for (uint8_t row = 0; row < matrix_rows(); row++) {
phex(row); print(": ");
#if (MATRIX_COLS <= 8)
pbin_reverse(matrix_get_row(row));
#else
pbin_reverse16(matrix_get_row(row));
#endif
#ifdef MATRIX_HAS_GHOST
if (matrix_has_ghost_in_row(row)) {
print(" <ghost");
}
#endif
print("\n");
}
}
uint8_t matrix_key_count(void)
{
uint8_t count = 0;
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
#if (MATRIX_COLS <= 8)
count += bitpop(matrix[i]);
#else
count += bitpop16(matrix[i]);
#endif
}
return count;
}
#ifdef MATRIX_HAS_GHOST
inline
static bool matrix_has_ghost_in_row(uint8_t row)
{
// no ghost exists in case less than 2 keys on
if (((matrix[row] - 1) & matrix[row]) == 0)
return false;
// ghost exists in case same state as other row
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
if (i != row && (matrix[i] & matrix[row]) == matrix[row])
return true;
}
return false;
}
#endif
inline
static uint8_t read_col(uint8_t row)
{
// For normal : Column C1 ~ C7 (PortC0-6), C0(Port E1)
// For modifier : B3(CNTRL)/4(SHIFT),F4(CMD/GUI)/5(OPTION,ALT)
// Modifier would be copied to report->mods except E4(CAPSLOCK)
uint8_t tmp;
if ( row == 10 ) {
tmp = 0xF0;
tmp |= (PINB >> 3 ) & 0b00000011; // LEFT CTRL is 0bit in modifier (HID Spec)
// LEFT SHIFT is 1bit in modifier (HID Spec)
tmp |= (PINF >> 3 ) & 0b00000100; // LEFT ALT is 2bit in modifier (HID Spec)
tmp |= (PINF >> 1 ) & 0b00001000; // LEFT GUI is 3bit in modifier (HID Spec)
//tmp |= (PINE << 1 ) & 0b00010000; // Caps Lock(Should not be in modifier
} else {
tmp = 0x00;
tmp = (PINE >> 1)&0b00000001;
tmp |= PINC << 1 ;
}
return tmp;
}
inline
static void unselect_rows(void)
{
// Hi-Z(DDR:0, PORT:0) to unselect
// DDR : 1, output 0, input
DDRB &= ~0b00000011; // PB: 1,0
PORTB &= ~0b00000011;
DDRD &= ~0b00010000; // PD: 4
PORTD &= ~0b00010000;
DDRE &= ~0b11000000; // PE: 7,6
PORTE &= ~0b11000000;
DDRF &= ~0b11000111; // PF: 7,6,2,1,0
PORTF &= ~0b11000111;
// to unselect virtual row(modifier), set port to output with low
DDRB |= 0b00011000; // PB: 3,4 for modifier(row10)
PORTB &= ~0b00011000;
DDRF |= 0b00110000; // PF: 4,5 for modifier
PORTF &= ~0b00110000;
}
inline
static void select_row(uint8_t row)
{
// Output low(DDR:1, PORT:0) to select
// with row enable, column could send low to AVR when pressed
// row: 0 1 2 3 4 5 6 7 8 9
// pin: PB1, PB0, PE7, PE6, PD4, PF2, PF0, PF1, PF6 PF7
switch (row) {
case 0:
DDRB |= (1<<1);
PORTB &= ~(1<<1);
break;
case 1:
DDRB |= (1<<0);
PORTB &= ~(1<<0);
break;
case 2:
DDRE |= (1<<7);
PORTE &= ~(1<<7);
break;
case 3:
DDRE |= (1<<6);
PORTE &= ~(1<<6);
break;
case 4:
DDRD |= (1<<4);
PORTD &= ~(1<<4);
break;
case 5:
DDRF |= (1<<2);
PORTF &= ~(1<<2);
break;
case 6:
DDRF |= (1<<0);
PORTF &= ~(1<<0);
break;
case 7:
DDRF |= (1<<1);
PORTF &= ~(1<<1);
break;
case 8:
DDRF |= (1<<6);
PORTF &= ~(1<<6);
break;
case 9:
DDRF |= (1<<7);
PORTF &= ~(1<<7);
break;
case 10:
// modifier has no row enable
// to select virtual row, set port as input
DDRB &= ~0b00011000;
PORTB |= 0b00011000;
DDRF &= ~0b00110000;
PORTF |= 0b00110000;
break;
}
}