1 #include QMK_KEYBOARD_H
3 bool i2c_initialized = 0;
4 i2c_status_t mcp23018_status = 0x20;
6 void matrix_init_kb(void) {
7 // (tied to Vcc for hardware convenience)
8 //DDRB &= ~(1<<4); // set B(4) as input
9 //PORTB &= ~(1<<4); // set B(4) internal pull-up disabled
12 // set as input with internal pull-up enabled
13 DDRB &= ~(1<<4 | 1<<5 | 1<<6 | 1<<7);
14 PORTB |= (1<<4 | 1<<5 | 1<<6 | 1<<7);
16 DDRC &= ~(1<<7 | 1<<6);
17 PORTC |= (1<<7 | 1<<6);
19 DDRD &= ~(1<<4 | 1<<5 | 1<<6 | 1<<7);
20 PORTD |= (1<<4 | 1<<5 | 1<<6 | 1<<7);
25 DDRF &= ~(1<<0 | 1<<1 | 1<<4 | 1<<6 | 1<<7);
26 PORTF |= (1<<0 | 1<<1 | 1<<4 | 1<<6 | 1<<7);
32 uint8_t init_mcp23018(void) {
33 print("starting init");
34 mcp23018_status = 0x20;
42 if (i2c_initialized == 0) {
43 i2c_init(); // on pins D(1,0)
44 i2c_initialized = true;
49 // - unused : input : 1
50 // - input : input : 1
51 // - driving : output : 0
52 mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
53 mcp23018_status = i2c_write(IODIRA, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
54 mcp23018_status = i2c_write(0b00000000, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
55 mcp23018_status = i2c_write(0b11111111, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
61 // - driving : off : 0
62 mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
63 mcp23018_status = i2c_write(GPPUA, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
64 mcp23018_status = i2c_write(0b00000000, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
65 mcp23018_status = i2c_write(0b11111111, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
70 //uprintf("Init %x\n", mcp23018_status);
71 return mcp23018_status;