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diff --git a/keyboards/bajjak/bajjak.c b/keyboards/bajjak/bajjak.c
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+/*
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
+Copyright 2015 ZSA Technology Labs Inc (@zsa)
+Copyright 2020 Christopher Courtney <drashna@live.com> (@drashna)
+Copyright 2021 Gary Kong <kongkm88@gmail.com> (@garykong)
+
+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 "bajjak.h"
+
+extern inline void bajjak_board_led_on(void);
+extern inline void bajjak_right_led_1_on(void);
+extern inline void bajjak_right_led_2_on(void);
+extern inline void bajjak_right_led_3_on(void);
+extern inline void bajjak_right_led_on(uint8_t led);
+
+extern inline void bajjak_board_led_off(void);
+extern inline void bajjak_right_led_1_off(void);
+extern inline void bajjak_right_led_2_off(void);
+extern inline void bajjak_right_led_3_off(void);
+extern inline void bajjak_right_led_off(uint8_t led);
+
+extern inline void bajjak_led_all_on(void);
+extern inline void bajjak_led_all_off(void);
+
+extern inline void bajjak_right_led_1_set(uint8_t n);
+extern inline void bajjak_right_led_2_set(uint8_t n);
+extern inline void bajjak_right_led_3_set(uint8_t n);
+extern inline void bajjak_right_led_set(uint8_t led, uint8_t n);
+
+extern inline void bajjak_led_all_set(uint8_t n);
+
+keyboard_config_t keyboard_config;
+
+bool i2c_initialized = 0;
+i2c_status_t mcp23018_status = 0x20;
+
+void matrix_init_kb(void) {
+ // keyboard LEDs (see "PWM on ports OC1(A|B|C)" in "teensy-2-0.md")
+ TCCR1A = 0b10101001; // set and configure fast PWM
+ TCCR1B = 0b00001001; // set and configure fast PWM
+
+ // (tied to Vcc for hardware convenience)
+ DDRB &= ~(1<<4); // set B(4) as input
+ PORTB &= ~(1<<4); // set B(4) internal pull-up disabled
+
+ // unused pins - D4, D5, E6
+ // set as input with internal pull-up enabled
+ DDRD &= ~(1<<5 | 1<<4);
+ DDRE &= ~(1<<6);
+ PORTD |= (1<<5 | 1<<4);
+ PORTE |= (1<<6);
+
+ keyboard_config.raw = eeconfig_read_kb();
+ bajjak_led_all_set((uint8_t)keyboard_config.led_level * 255 / 4 );
+ bajjak_blink_all_leds();
+
+ matrix_init_user();
+}
+
+void bajjak_blink_all_leds(void)
+{
+ bajjak_led_all_off();
+ bajjak_led_all_set(LED_BRIGHTNESS_DEFAULT);
+ bajjak_right_led_1_on();
+ wait_ms(50);
+ bajjak_right_led_2_on();
+ wait_ms(50);
+ bajjak_right_led_3_on();
+ wait_ms(50);
+#ifdef LEFT_LEDS
+ bajjak_left_led_1_on();
+ wait_ms(50);
+ if (!mcp23018_status) {
+ mcp23018_status = bajjak_left_leds_update();
+ }
+ bajjak_left_led_2_on();
+ wait_ms(50);
+ if (!mcp23018_status) {
+ mcp23018_status = bajjak_left_leds_update();
+ }
+#endif
+ bajjak_right_led_1_off();
+ wait_ms(50);
+ bajjak_right_led_2_off();
+ wait_ms(50);
+ bajjak_right_led_3_off();
+#ifdef LEFT_LEDS
+ wait_ms(50);
+ bajjak_left_led_1_off();
+ if (!mcp23018_status) {
+ mcp23018_status = bajjak_left_leds_update();
+ }
+ wait_ms(50);
+ bajjak_left_led_2_off();
+ if (!mcp23018_status) {
+ mcp23018_status = bajjak_left_leds_update();
+ }
+#endif
+
+ //bajjak_led_all_on();
+ //wait_ms(333);
+ bajjak_led_all_off();
+}
+
+uint8_t init_mcp23018(void) {
+ mcp23018_status = 0x20;
+
+ // I2C subsystem
+
+ // uint8_t sreg_prev;
+ // sreg_prev=SREG;
+ // cli();
+
+ if (i2c_initialized == 0) {
+ i2c_init(); // on pins D(1,0)
+ i2c_initialized = true;
+ wait_ms(1000);
+ }
+ // i2c_init(); // on pins D(1,0)
+ // wait_ms(1000);
+
+ // set pin direction
+ // - unused : input : 1
+ // - input : input : 1
+ // - driving : output : 0
+ mcp23018_status = i2c_start(I2C_ADDR_WRITE, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(IODIRA, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(0b00000000, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(0b00111111, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ i2c_stop();
+
+ // set pull-up
+ // - unused : on : 1
+ // - input : on : 1
+ // - driving : off : 0
+ mcp23018_status = i2c_start(I2C_ADDR_WRITE, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(GPPUA, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(0b00000000, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(0b01111111, BAJJAK_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+
+out:
+ i2c_stop();
+
+#ifdef LEFT_LEDS
+ if (!mcp23018_status) mcp23018_status = bajjak_left_leds_update();
+#endif // LEFT_LEDS
+
+ // SREG=sreg_prev;
+
+ return mcp23018_status;
+}
+
+#ifdef LEFT_LEDS
+uint8_t bajjak_left_leds_update(void) {
+ if (mcp23018_status) { // if there was an error
+ return mcp23018_status;
+ }
+#define LEFT_LED_1_SHIFT 7 // in MCP23018 port A
+#define LEFT_LED_2_SHIFT 7 // in MCP23018 port B
+
+ // set logical value (doesn't matter on inputs)
+ // - unused : hi-Z : 1
+ // - input : hi-Z : 1
+ // - driving : hi-Z : 1
+ mcp23018_status = i2c_start(I2C_ADDR_WRITE, BAJJAK_EZ_I2C_TIMEOUT);
+ if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(OLATA, BAJJAK_EZ_I2C_TIMEOUT);
+ if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(0b11111111
+ & ~(bajjak_left_led_1<<LEFT_LED_1_SHIFT),
+ BAJJAK_EZ_I2C_TIMEOUT);
+ if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(0b11111111
+ & ~(bajjak_left_led_2<<LEFT_LED_2_SHIFT),
+ BAJJAK_EZ_I2C_TIMEOUT);
+ if (mcp23018_status) goto out;
+
+ out:
+ i2c_stop();
+ return mcp23018_status;
+}
+#endif
+
+
+#ifdef SWAP_HANDS_ENABLE
+__attribute__ ((weak))
+// swap-hands action needs a matrix to define the swap
+const keypos_t hand_swap_config[MATRIX_ROWS][MATRIX_COLS] = {
+ /* Left hand, matrix positions */
+ {{0, 13}, {1, 13}, {2, 13}, {3, 13}, {4, 13}, {5, 13}, {6, 13}},
+ {{0, 12}, {1, 12}, {2, 12}, {3, 12}, {4, 12}, {5, 12}, {6, 12}},
+ {{0, 11}, {1, 11}, {2, 11}, {3, 11}, {4, 11}, {5, 11}, {6, 11}},
+ {{0, 10}, {1, 10}, {2, 10}, {3, 10}, {4, 10}, {5, 10}, {6, 10}},
+ {{0, 9}, {1, 9}, {2, 9}, {3, 9}, {4, 9}, {5, 9}, {6, 9}},
+ {{0, 8}, {1, 8}, {2, 8}, {3, 8}, {4, 8}, {5, 8}, {6, 8}},
+ {{0, 7}, {1, 7}, {2, 7}, {3, 7}, {4, 7}, {5, 7}, {6, 7}},
+ /* Right hand, matrix positions */
+ {{0, 6}, {1, 6}, {2, 6}, {3, 6}, {4, 6}, {5, 6}, {6, 6}},
+ {{0, 5}, {1, 5}, {2, 5}, {3, 5}, {4, 5}, {5, 5}, {6, 5}},
+ {{0, 4}, {1, 4}, {2, 4}, {3, 4}, {4, 4}, {5, 4}, {6, 4}},
+ {{0, 3}, {1, 3}, {2, 3}, {3, 3}, {4, 3}, {5, 3}, {6, 3}},
+ {{0, 2}, {1, 2}, {2, 2}, {3, 2}, {4, 2}, {5, 2}, {6, 2}},
+ {{0, 1}, {1, 1}, {2, 1}, {3, 1}, {4, 1}, {5, 1}, {6, 1}},
+ {{0, 0}, {1, 0}, {2, 0}, {3, 0}, {4, 0}, {5, 0}, {6, 0}},
+};
+#endif
+
+void eeconfig_init_kb(void) { // EEPROM is getting reset!
+ keyboard_config.raw = 0;
+ keyboard_config.led_level = 4;
+ eeconfig_update_kb(keyboard_config.raw);
+ eeconfig_init_user();
+}
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