keyboards/handwired/frenchdev/frenchdev.c

   1 #include "frenchdev.h"
   2 #include "i2cmaster.h"
   3
   4 bool i2c_initialized = 0;
   5 uint8_t mcp23018_status = 0x20;
   6
   7 void matrix_init_kb(void) {
   8    // keyboard LEDs (see "PWM on ports OC1(A|B|C)" in "teensy-2-0.md")
   9     TCCR1A = 0b10101001;  // set and configure fast PWM
  10     TCCR1B = 0b00001001;  // set and configure fast PWM
  11
  12
  13
  14     // unused pins - D4, D5, D7, E6
  15     // set as input with internal pull-ip enabled
  16     DDRD  &= ~(1<<5 | 1<<4);
  17     DDRE  &= ~(1<<6);
  18     PORTD |=  (1<<5 | 1<<4);
  19     PORTE |=  (1<<6);
  20
  21     frenchdev_blink_all_leds();
  22     frenchdev_blink_all_leds();
  23     frenchdev_blink_all_leds();
  24     frenchdev_blink_all_leds();
  25
  26     matrix_init_user();
  27 }
  28
  29 void frenchdev_blink_all_leds(void)
  30 {
  31     frenchdev_led_all_off();
  32     frenchdev_led_all_set(LED_BRIGHTNESS_HI);
  33     frenchdev_led_1_on();
  34     _delay_ms(50);
  35     frenchdev_led_2_on();
  36     _delay_ms(50);
  37     frenchdev_led_3_on();
  38     _delay_ms(50);
  39     frenchdev_led_1_off();
  40     _delay_ms(50);
  41     frenchdev_led_2_off();
  42     _delay_ms(50);
  43     frenchdev_led_3_off();
  44     frenchdev_led_all_off();
  45 }
  46
  47 uint8_t init_mcp23018(void) {
  48     mcp23018_status = 0x20;
  49
  50     // I2C subsystem
  51
  52     // uint8_t sreg_prev;
  53     // sreg_prev=SREG;
  54     // cli();
  55     if (i2c_initialized == 0) {
  56         i2c_init();  // on pins D(1,0)
  57         i2c_initialized++;
  58         _delay_ms(1000);
  59     }
  60
  61     // set pin direction
  62     // - unused  : input  : 1
  63     // - input   : input  : 1
  64     // - driving : output : 0
  65     mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
  66     mcp23018_status = i2c_write(IODIRA);            if (mcp23018_status) goto out;
  67     mcp23018_status = i2c_write(0b00000000);        if (mcp23018_status) goto out;
  68     mcp23018_status = i2c_write(0b00111111);        if (mcp23018_status) goto out;
  69     i2c_stop();
  70
  71     // set pull-up
  72     // - unused  : on  : 1
  73     // - input   : on  : 1
  74     // - driving : off : 0
  75     mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
  76     mcp23018_status = i2c_write(GPPUA);             if (mcp23018_status) goto out;
  77     mcp23018_status = i2c_write(0b00000000);        if (mcp23018_status) goto out;
  78     mcp23018_status = i2c_write(0b00111111);        if (mcp23018_status) goto out;
  79
  80 out:
  81     i2c_stop();
  82
  83     // SREG=sreg_prev;
  84
  85     return mcp23018_status;
  86 }
  87