69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* 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;
|
|
}
|