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In keymap_common.h :
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#define KEYMAP( \
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    K00, K01, K02, K03, \
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    K10, K11, K12, \
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    K20, K21, K22, K23, \
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    K30, K31, K32, \
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    K40, K41, K42, \
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) { \
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    { KC_##K00, KC_##K01, KC_##K02, KC_##K03 }, \
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    { KC_##K10, KC_##K11, KC_##K12, KC_NO}, \
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    { KC_##K20, KC_##K21, KC_##K22, KC_##K23 }, \
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    { KC_##K30, KC_##K31, KC_##K32, KC_NO }, \
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    { KC_##K40, KC_NO, KC_##K41, KC_##K42}  \
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}
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#endif
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-----------------------
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In config.h :
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/* key matrix size */
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#define MATRIX_ROWS 5
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#define MATRIX_COLS 4
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-----------------------
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In keymap_poker.h :
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#include "keymap_common.h"
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const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
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		   KEYMAP(KC_ESCAPE,KC_KP_SLASH,KC_KP_ASTERISK,KC_KP_MINUS, \
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		   KC_KP_7,KC_KP_8,KC_KP_9, \
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		   KC_KP_4,KC_KP_5,KC_KP_6,KC_KP_PLUS, \
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		   KC_KP_1,KC_KP_2,KC_KP_3, \
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		   KC_KP_ENTER,KC_KP_DOT,KC_KP_0),
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};
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const uint16_t PROGMEM fn_actions[] = {
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};
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----------------------
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In config.h :
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/* Column pin configuration
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 * col: 0   1   2   3
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 * pin: F4  F1  F5  F6 
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*/
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static void  init_cols(void)
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{
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	DDRF &= ~(1<<4 | 1<<1 | 1<<5 | 1<<6);
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	PORTF |= (1<<4 | 1<<1 | 1<<5 | 1<<6);
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    // Input with pull-up(DDR:0, PORT:1)
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}
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static matrix_row_t read_cols(void)
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{
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	return (PINF&(1<<4) ? 0 : (1<<0)) |
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		   (PINF&(1<<1) ? 0 : (1<<1)) |
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		   (PINF&(1<<5) ? 0 : (1<<2)) |
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		   (PINF&(1<<6) ? 0 : (1<<3));
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}
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/* Row pin configuration
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 * row: 0   1   2   3   4
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 * pin: B1  B2  B3  B7  B0
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 */
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static void unselect_rows(void)
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{
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    // Hi-Z(DDR:0, PORT:0) to unselect
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    DDRB  &= ~0b10001111;
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    PORTB &= ~0b00001111;
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}
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static void select_row(uint8_t row)
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{
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    // Output low(DDR:1, PORT:0) to select
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    switch (row) {
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        case 0:
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            DDRB  |= (1<<1);
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            PORTB &= ~(1<<1);
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            break;
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        case 1:
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            DDRB  |= (1<<2);
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            PORTB &= ~(1<<2);
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            break;
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        case 2:
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            DDRB  |= (1<<3);
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            PORTB &= ~(1<<3);
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            break;
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        case 3:
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            DDRB  |= (1<<7);
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            PORTB &= ~(1<<7);
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            break;
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        case 4:
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            DDRB  |= (1<<0);
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            PORTB &= ~(1<<0);
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            break;
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    }
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}
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----------------------
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Full error from cygwin64 :
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mkdir -p obj_gh60_lufa
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Compiling C: keymap_poker.c
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avr-gcc -c -mmcu=atmega32u4 -gdwarf-2 -DF_CPU=16000000UL -DINTERRUPT_CONTROL_ENDPOINT -DBOOTLOADER_SIZE=4096 -DF_USB=16000000UL -DARCH=ARCH_AVR8 -DUSB_DEVICE_ONLY -DUSE_FLASH_DESCRIPTORS -DUSE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)" -DFIXED_CONTROL_ENDPOINT_SIZE=8  -DFIXED_NUM_CONFIGURATIONS=1 -DPROTOCOL_LUFA -DBOOTMAGIC_ENABLE -DMOUSEKEY_ENABLE -DMOUSE_ENABLE -DEXTRAKEY_ENABLE -DCONSOLE_ENABLE -DCOMMAND_ENABLE -DNKRO_ENABLE -DVERSION=unknown -Os -funsigned-char -funsigned-bitfields -ffunction-sections -fno-inline-small-functions -fpack-struct -fshort-enums -fno-strict-aliasing -Wall -Wstrict-prototypes -Wa,-adhlns=obj_gh60_lufa/keymap_poker.lst -I. -I../.. -I../../protocol/lufa -I../../protocol/lufa/LUFA-120730 -I../../common -std=gnu99 -include config.h -MMD -MP -MF .dep/obj_gh60_lufa_keymap_poker.o.d  keymap_poker.c -o obj_gh60_lufa/keymap_poker.o
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In file included from keymap_poker.c:1:0:
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keymap_common.h:46:1: error: parameter name missing
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 ) { \
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 ^
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keymap_poker.c:4:6: warning: implicit declaration of function 'KEYMAP' [-Wimplicit-function-declaration]
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      KEYMAP(KC_ESCAPE,KC_KP_SLASH,KC_KP_ASTERISK,KC_KP_MINUS, \
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      ^
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keymap_poker.c:4:6: warning: missing braces around initializer [-Wmissing-braces]
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keymap_poker.c:4:6: warning: (near initialization for 'keymaps[0]') [-Wmissing-braces]
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keymap_poker.c:4:6: error: initializer element is not constant
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keymap_poker.c:4:6: error: (near initialization for 'keymaps[0][0][0]')
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../../rules.mk:541: recipe for target 'obj_gh60_lufa/keymap_poker.o' failed
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make: *** [obj_gh60_lufa/keymap_poker.o] Error 1