keyboards/sx60/sx60.c

   1 #include "sx60.h"
   2 #include "i2cmaster.h"
   3
   4
   5 bool i2c_initialized = 0;
   6 uint8_t mcp23018_status = 0x20;
   7
   8 uint8_t init_mcp23018(void) {
   9     mcp23018_status = 0x20;
  10
  11     /* I2C subsystem */
  12
  13     if (i2c_initialized == 0) {
  14         i2c_init();  // on pins D(1,0)
  15         i2c_initialized = true;
  16         _delay_ms(1000);
  17     }
  18
  19     /* B Pins are Row, A pins are Columns
  20        Set them to output */
  21     mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
  22     mcp23018_status = i2c_write(IODIRA);            if (mcp23018_status) goto out;
  23     mcp23018_status = i2c_write(0b11111111);        if (mcp23018_status) goto out;
  24     /* Now write to IODIRB */
  25     mcp23018_status = i2c_write(0b00000000);        if (mcp23018_status) goto out;
  26     i2c_stop();
  27
  28     mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
  29     mcp23018_status = i2c_write(GPPUA);             if (mcp23018_status) goto out;
  30     mcp23018_status = i2c_write(0b11111111);        if (mcp23018_status) goto out;
  31     /* Now write to GPPUB */
  32     mcp23018_status = i2c_write(0b00000000);        if (mcp23018_status) goto out;
  33
  34 out:
  35     i2c_stop();
  36
  37     return mcp23018_status;
  38 }