138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
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/*
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Copyright 2016 Kai Ryu <kai1103@gmail.com>
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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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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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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 <stdbool.h>
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#include "action.h"
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#include "i2cmaster.h"
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#include "expander.h"
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#include "debug.h"
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static uint8_t expander_status = 0;
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static uint8_t expander_input = 0;
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void expander_config(void);
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uint8_t expander_write(uint8_t reg, uint8_t data);
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uint8_t expander_read(uint8_t reg, uint8_t *data);
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void expander_init(void)
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{
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i2c_init();
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expander_scan();
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}
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void expander_scan(void)
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{
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dprintf("expander status: %d ... ", expander_status);
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uint8_t ret = i2c_start(EXPANDER_ADDR | I2C_WRITE);
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if (ret == 0) {
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i2c_stop();
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if (expander_status == 0) {
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dprintf("attached\n");
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expander_status = 1;
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expander_config();
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clear_keyboard();
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}
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}
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else {
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if (expander_status == 1) {
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dprintf("detached\n");
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expander_status = 0;
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clear_keyboard();
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}
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}
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dprintf("%d\n", expander_status);
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}
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void expander_read_cols(void)
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{
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expander_read(EXPANDER_REG_GPIOA, &expander_input);
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}
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uint8_t expander_get_col(uint8_t col)
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{
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if (col > 4) {
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col++;
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}
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return expander_input & (1<<col) ? 1 : 0;
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}
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matrix_row_t expander_read_row(void)
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{
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expander_read_cols();
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/* make cols */
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matrix_row_t cols = 0;
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for (uint8_t col = 0; col < MATRIX_COLS; col++) {
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if (expander_get_col(col)) {
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cols |= (1UL << col);
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}
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}
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return cols;
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}
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void expander_unselect_rows(void)
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{
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expander_write(EXPANDER_REG_IODIRB, 0xFF);
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}
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void expander_select_row(uint8_t row)
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{
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expander_write(EXPANDER_REG_IODIRB, ~(1<<(row+1)));
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}
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void expander_config(void)
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{
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expander_write(EXPANDER_REG_IPOLA, 0xFF);
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expander_write(EXPANDER_REG_GPPUA, 0xFF);
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expander_write(EXPANDER_REG_IODIRB, 0xFF);
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}
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uint8_t expander_write(uint8_t reg, uint8_t data)
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{
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if (expander_status == 0) {
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return 0;
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}
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uint8_t ret;
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ret = i2c_start(EXPANDER_ADDR | I2C_WRITE);
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if (ret) goto stop;
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ret = i2c_write(reg);
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if (ret) goto stop;
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ret = i2c_write(data);
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stop:
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i2c_stop();
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return ret;
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}
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uint8_t expander_read(uint8_t reg, uint8_t *data)
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{
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if (expander_status == 0) {
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return 0;
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}
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uint8_t ret;
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ret = i2c_start(EXPANDER_ADDR | I2C_WRITE);
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if (ret) goto stop;
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ret = i2c_write(reg);
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if (ret) goto stop;
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ret = i2c_rep_start(EXPANDER_ADDR | I2C_READ);
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if (ret) goto stop;
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*data = i2c_readNak();
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stop:
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i2c_stop();
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return ret;
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}
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