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diff --git a/keyboards/frenchdev/v1/v1.h b/keyboards/frenchdev/v1/v1.h
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+++ b/keyboards/frenchdev/v1/v1.h
@@ -0,0 +1,116 @@
+#ifndef FRENCHDEV_V1_H
+#define FRENCHDEV_V1_H
+
+#include "quantum.h"
+#include <stdint.h>
+#include <stdbool.h>
+#include "i2cmaster.h"
+#include <util/delay.h>
+
+#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
+#define CPU_16MHz 0x00
+
+// I2C aliases and register addresses (see "mcp23018.md")
+#define I2C_ADDR 0b0100000
+#define I2C_ADDR_WRITE ( (I2C_ADDR<<1) | I2C_WRITE )
+#define I2C_ADDR_READ ( (I2C_ADDR<<1) | I2C_READ )
+#define IODIRA 0x00 // i/o direction register
+#define IODIRB 0x01
+#define GPPUA 0x0C // GPIO pull-up resistor register
+#define GPPUB 0x0D
+#define GPIOA 0x12 // general purpose i/o port register (write modifies OLAT)
+#define GPIOB 0x13
+#define OLATA 0x14 // output latch register
+#define OLATB 0x15
+
+extern uint8_t mcp23018_status;
+
+void init_ergodox(void);
+void ergodox_blink_all_leds(void);
+uint8_t init_mcp23018(void);
+uint8_t ergodox_left_leds_update(void);
+
+#define LED_BRIGHTNESS_LO 15
+#define LED_BRIGHTNESS_HI 255
+
+
+inline void ergodox_board_led_on(void) { DDRD |= (1<<6); PORTD |= (1<<6); }
+inline void ergodox_right_led_1_on(void) { DDRB |= (1<<5); PORTB |= (1<<5); }
+inline void ergodox_right_led_2_on(void) { DDRB |= (1<<6); PORTB |= (1<<6); }
+inline void ergodox_right_led_3_on(void) { DDRB |= (1<<7); PORTB |= (1<<7); }
+inline void ergodox_right_led_on(uint8_t led) { DDRB |= (1<<(led+4)); PORTB |= (1<<(led+4)); }
+
+inline void ergodox_board_led_off(void) { DDRD &= ~(1<<6); PORTD &= ~(1<<6); }
+inline void ergodox_right_led_1_off(void) { DDRB &= ~(1<<5); PORTB &= ~(1<<5); }
+inline void ergodox_right_led_2_off(void) { DDRB &= ~(1<<6); PORTB &= ~(1<<6); }
+inline void ergodox_right_led_3_off(void) { DDRB &= ~(1<<7); PORTB &= ~(1<<7); }
+inline void ergodox_right_led_off(uint8_t led) { DDRB &= ~(1<<(led+4)); PORTB &= ~(1<<(led+4)); }
+
+inline void ergodox_led_all_on(void)
+{
+ ergodox_board_led_on();
+ ergodox_right_led_1_on();
+ ergodox_right_led_2_on();
+ ergodox_right_led_3_on();
+}
+
+inline void ergodox_led_all_off(void)
+{
+ ergodox_board_led_off();
+ ergodox_right_led_1_off();
+ ergodox_right_led_2_off();
+ ergodox_right_led_3_off();
+}
+
+inline void ergodox_right_led_1_set(uint8_t n) { OCR1A = n; }
+inline void ergodox_right_led_2_set(uint8_t n) { OCR1B = n; }
+inline void ergodox_right_led_3_set(uint8_t n) { OCR1C = n; }
+inline void ergodox_right_led_set(uint8_t led, uint8_t n) {
+ (led == 1) ? (OCR1A = n) :
+ (led == 2) ? (OCR1B = n) :
+ (OCR1C = n);
+}
+
+inline void ergodox_led_all_set(uint8_t n)
+{
+ ergodox_right_led_1_set(n);
+ ergodox_right_led_2_set(n);
+ ergodox_right_led_3_set(n);
+}
+
+#define KEYMAP( \
+ \
+ k01, k02, k03, k04, k05, k06, k09, k0a, k0b, k0c, k0d, k0e, \
+ k10, k11, k12, k13, k14, k15, k16, k19, k1a, k1b, k1c, k1d, k1e, k1f, \
+ k20, k21, k22, k23, k24, k25, k26, k29, k2a, k2b, k2c, k2d, k2e, k2f, \
+ k30, k31, k32, k33, k34, k35, k36, k39, k3a, k3b, k3c, k3d, k3e, k3f, \
+ k40, k41, k42, k43, k44, k45, k46, k47, k37, k38, k48, k49, k4a, k4b, k4c, k4d, k4e, k4f, \
+ k50, k51, k52, k53, k54, k55, k56, k57, k58, k59, k5a, k5b, k5c, k5d, k5e, k5f, \
+ \
+ PL1, PL2, PL3, \
+ PR1, PR2, PR3 \
+ ) \
+ \
+ /* matrix positions, inverted left and right for I2C to be on row 0-7 */\
+ { \
+ \
+ { k5f, k4f, k3f, k2f, k1f, KC_NO}, \
+ { k5e, k4e, k3e, k2e, k1e, k0e }, \
+ { k5d, k4d, k3d, k2d, k1d, k0d }, \
+ { k5c, k4c, k3c, k2c, k1c, k0c }, \
+ { k5b, k4b, k3b, k2b, k1b, k0b }, \
+ { k5a, k4a, k3a, k2a, k1a, k0a }, \
+ { k59, k49, k39, k29, k19, k09 }, \
+ { k58, k48, k38, PR1, PR2, PR3 }, \
+ \
+ { k57, k47, k37, PL1, PL2, PL3 }, \
+ { k56, k46, k36, k26, k16, k06 }, \
+ { k55, k44, k35, k25, k15, k05 }, \
+ { k54, k44, k34, k24, k14, k04 }, \
+ { k53, k43, k33, k23, k13, k03 }, \
+ { k52, k42, k32, k22, k12, k02 }, \
+ { k51, k41, k31, k21, k11, k01 }, \
+ { k50, k40, k30, k20, k10, KC_NO } \
+ }
+
+#endif