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
11 // unused pins - C7, D4, D5, D7, E6
12 // set as input with internal pull-up enabled
14 DDRD &= ~(1<<5 | 1<<4 | 1<<6 | 1<<7);
17 PORTD |= (1<<5 | 1<<4 | 1<<6 | 1<<7);
24 uint8_t init_mcp23018(void) {
25 print("starting init");
26 mcp23018_status = 0x20;
34 if (i2c_initialized == 0) {
35 i2c_init(); // on pins D(1,0)
36 i2c_initialized = true;
39 // i2c_init(); // on pins D(1,0)
43 // - unused : input : 1
44 // - input : input : 1
45 // - driving : output : 0
46 mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
47 mcp23018_status = i2c_write(IODIRA, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
48 mcp23018_status = i2c_write(0b10000000, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
49 mcp23018_status = i2c_write(0b11111111, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
50 i2c_stop(ERGODOX_EZ_I2C_TIMEOUT);
55 // - driving : off : 0
56 mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
57 mcp23018_status = i2c_write(GPPUA, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
58 mcp23018_status = i2c_write(0b10000000, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
59 mcp23018_status = i2c_write(0b11111111, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
62 i2c_stop(ERGODOX_EZ_I2C_TIMEOUT);
64 //uprintf("Init %x\n", mcp23018_status);
65 return mcp23018_status;