5 bool i2c_initialized = 0;
6 uint8_t mcp23018_status = 0x20;
8 void matrix_init_kb(void) {
9 DDRB &= ~(1<<4); // set B(4) as input
10 PORTB &= ~(1<<4); // set B(4) internal pull-up disabled
12 // unused pins - C7, D4, D5, D7, E6
13 // set as input with internal pull-up enabled
15 DDRD &= ~(1<<5 | 1<<4);
18 PORTD |= (1<<5 | 1<<4);
24 uint8_t init_mcp23018(void) {
25 mcp23018_status = 0x20;
29 if (i2c_initialized == 0) {
30 i2c_init(); // on pins D(1,0)
31 i2c_initialized = true;
36 // - unused : input : 1
37 // - input : input : 1
38 // - driving : output : 0
39 mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
40 mcp23018_status = i2c_write(IODIRA); if (mcp23018_status) goto out;
41 mcp23018_status = i2c_write(0b00000000); if (mcp23018_status) goto out;
42 mcp23018_status = i2c_write(0b00111111); if (mcp23018_status) goto out;
48 // - driving : off : 0
49 mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
50 mcp23018_status = i2c_write(GPPUA); if (mcp23018_status) goto out;
51 mcp23018_status = i2c_write(0b00000000); if (mcp23018_status) goto out;
52 mcp23018_status = i2c_write(0b00111111); if (mcp23018_status) goto out;
57 return mcp23018_status;
61 __attribute__ ((weak))
62 // swap-hands action needs a matrix to define the swap
63 const keypos_t hand_swap_config[MATRIX_ROWS][MATRIX_COLS] = {
64 /* Left hand, matrix positions */
65 {{0,11}, {1,11}, {2,11}, {3,11}, {4,11}, {5,11}},
66 {{0,10}, {1,10}, {2,10}, {3,10}, {4,10}, {5,10}},
67 {{0,9}, {1,9}, {2,9}, {3,9}, {4,9}, {5,9}},
68 {{0,8}, {1,8}, {2,8}, {3,8}, {4,8}, {5,8}},
69 {{0,7}, {1,7}, {2,7}, {3,7}, {4,7}, {5,7}},
70 {{0,6}, {1,6}, {2,6}, {3,6}, {4,6}, {5,6}},
72 /* Right hand, matrix positions */
73 {{0,5}, {1,5}, {2,5}, {3,5}, {4,5}, {5,5}},
74 {{0,4}, {1,4}, {2,4}, {3,4}, {4,4}, {5,4}},
75 {{0,3}, {1,3}, {2,3}, {3,3}, {4,3}, {5,3}},
76 {{0,2}, {1,2}, {2,2}, {3,2}, {4,2}, {5,2}},
77 {{0,1}, {1,1}, {2,1}, {3,1}, {4,1}, {5,1}},
78 {{0,0}, {1,0}, {2,0}, {3,0}, {4,0}, {5,0}},