69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
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/* Copyright 2021 Jane Bernhardt
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "gergoplex.h"
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bool i2c_initialized = 0;
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i2c_status_t mcp23018_status = 0x20;
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void matrix_init_kb(void) {
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matrix_init_user();
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}
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uint8_t init_mcp23018(void) {
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print("starting init");
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mcp23018_status = 0x20;
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// I2C subsystem
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if (i2c_initialized == 0) {
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i2c_init(); // on pins D(1,0)
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i2c_initialized = true;
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_delay_ms(1000);
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}
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// set pin direction
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// - unused : input : 1
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// - input : input : 1
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// - driving : output : 0
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mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(IODIRA, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(0b11000001, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(0b11111111, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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i2c_stop();
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// set pull-up
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// - unused : on : 1
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// - input : on : 1
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// - driving : off : 0
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mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPPUA, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(0b11000001, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(0b11111111, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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out:
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i2c_stop();
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return mcp23018_status;
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}
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