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#include QMK_KEYBOARD_H
bool i2c_initialized = 0;
i2c_status_t mcp23018_status = 0x20;
void matrix_init_kb(void) {
// (tied to Vcc for hardware convenience)
//DDRB &= ~(1<<4); // set B(4) as input
//PORTB &= ~(1<<4); // set B(4) internal pull-up disabled
// unused pins
// set as input with internal pull-up enabled
DDRB &= ~(1<<4 | 1<<5 | 1<<6 | 1<<7);
PORTB |= (1<<4 | 1<<5 | 1<<6 | 1<<7);
DDRC &= ~(1<<7 | 1<<6);
PORTC |= (1<<7 | 1<<6);
DDRD &= ~(1<<4 | 1<<5 | 1<<6 | 1<<7);
PORTD |= (1<<4 | 1<<5 | 1<<6 | 1<<7);
DDRE &= ~(1<<6);
PORTE |= (1<<6);
DDRF &= ~(1<<0 | 1<<1 | 1<<4 | 1<<6 | 1<<7);
PORTF |= (1<<0 | 1<<1 | 1<<4 | 1<<6 | 1<<7);
matrix_init_user();
}
uint8_t init_mcp23018(void) {
print("starting init");
mcp23018_status = 0x20;
// I2C subsystem
// uint8_t sreg_prev;
// sreg_prev=SREG;
// cli();
if (i2c_initialized == 0) {
i2c_init(); // on pins D(1,0)
i2c_initialized = true;
_delay_ms(1000);
}
// set pin direction
// - unused : input : 1
// - input : input : 1
// - driving : output : 0
mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(IODIRA, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0b00000000, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0b11111111, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
i2c_stop();
// set pull-up
// - unused : on : 1
// - input : on : 1
// - driving : off : 0
mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(GPPUA, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0b00000000, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0b11111111, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
out:
i2c_stop();
// SREG=sreg_prev;
//uprintf("Init %x\n", mcp23018_status);
return mcp23018_status;
}
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