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/* Copyright 2021 Jane Bernhardt
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "gergoplex.h"
bool i2c_initialized = 0;
i2c_status_t mcp23018_status = 0x20;
void matrix_init_kb(void) {
matrix_init_user();
}
uint8_t init_mcp23018(void) {
print("starting init");
mcp23018_status = 0x20;
// I2C subsystem
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, I2C_TIMEOUT);
if (mcp23018_status) goto out;
mcp23018_status = i2c_write(IODIRA, I2C_TIMEOUT);
if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0b11000001, I2C_TIMEOUT);
if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0b11111111, 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, I2C_TIMEOUT);
if (mcp23018_status) goto out;
mcp23018_status = i2c_write(GPPUA, I2C_TIMEOUT);
if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0b11000001, I2C_TIMEOUT);
if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0b11111111, I2C_TIMEOUT);
if (mcp23018_status) goto out;
out:
i2c_stop();
return mcp23018_status;
}
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