keyboard/ergodox_ez/ergodox_ez.c

   1 #include "ergodox_ez.h"
   2 #include "i2cmaster.h"
   3
   4 bool i2c_initialized = 0;
   5 uint8_t mcp23018_status = 0x20;
   6
   7 __attribute__ ((weak))
   8 void * matrix_init_user(void) {
   9
  10 };
  11
  12 __attribute__ ((weak))
  13 void * matrix_scan_user(void) {
  14
  15 };
  16
  17 void * matrix_init_kb(void) {
  18    // keyboard LEDs (see "PWM on ports OC1(A|B|C)" in "teensy-2-0.md")
  19     TCCR1A = 0b10101001;  // set and configure fast PWM
  20     TCCR1B = 0b00001001;  // set and configure fast PWM
  21
  22     // (tied to Vcc for hardware convenience)
  23     DDRB  &= ~(1<<4);  // set B(4) as input
  24     PORTB &= ~(1<<4);  // set B(4) internal pull-up disabled
  25
  26     // unused pins - C7, D4, D5, D7, E6
  27     // set as input with internal pull-ip enabled
  28     DDRC  &= ~(1<<7);
  29     DDRD  &= ~(1<<7 | 1<<5 | 1<<4);
  30     DDRE  &= ~(1<<6);
  31     PORTC |=  (1<<7);
  32     PORTD |=  (1<<7 | 1<<5 | 1<<4);
  33     PORTE |=  (1<<6);
  34
  35     ergodox_blink_all_leds();
  36
  37         if (matrix_init_user) {
  38                 (*matrix_init_user)();
  39         }
  40 };
  41
  42 void * matrix_scan_kb(void) {
  43
  44         if (matrix_scan_user) {
  45                 (*matrix_scan_user)();
  46         }
  47 };
  48
  49
  50 void ergodox_blink_all_leds(void)
  51 {
  52     ergodox_led_all_off();
  53     ergodox_led_all_set(LED_BRIGHTNESS_HI);
  54     ergodox_led_all_on();
  55     _delay_ms(333);
  56     ergodox_led_all_off();
  57 }
  58
  59 uint8_t init_mcp23018(void) {
  60     mcp23018_status = 0x20;
  61
  62     // I2C subsystem
  63     if (i2c_initialized == 0) {
  64         i2c_init();  // on pins D(1,0)
  65         i2c_initialized++;
  66         _delay_ms(1000);
  67     }
  68
  69     // set pin direction
  70     // - unused  : input  : 1
  71     // - input   : input  : 1
  72     // - driving : output : 0
  73     mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
  74     mcp23018_status = i2c_write(IODIRA);            if (mcp23018_status) goto out;
  75     mcp23018_status = i2c_write(0b00000000);        if (mcp23018_status) goto out;
  76     mcp23018_status = i2c_write(0b00111111);        if (mcp23018_status) goto out;
  77     i2c_stop();
  78
  79     // set pull-up
  80     // - unused  : on  : 1
  81     // - input   : on  : 1
  82     // - driving : off : 0
  83     mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
  84     mcp23018_status = i2c_write(GPPUA);             if (mcp23018_status) goto out;
  85     mcp23018_status = i2c_write(0b00000000);        if (mcp23018_status) goto out;
  86     mcp23018_status = i2c_write(0b00111111);        if (mcp23018_status) goto out;
  87
  88 out:
  89     i2c_stop();
  90
  91     return mcp23018_status;
  92 }
  93
  94