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- /*
- Copyright 2014 Kai Ryu <[email protected]>
-
- 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/>.
- */
-
- #define KIMERA_C
-
- #include <stdbool.h>
- #include <avr/eeprom.h>
- #include "kimera.h"
-
- uint8_t mux_mapping[MUX_COUNT] = {
- MUX_FOR_ROW, MUX_FOR_COL, MUX_FOR_COL, MUX_FOR_COL
- };
- uint8_t row_mapping[MATRIX_ROWS] = {
- 0, 1, 2, 3, 4, 5, 6, 7,
- UNCONFIGURED, UNCONFIGURED, UNCONFIGURED, UNCONFIGURED, UNCONFIGURED, UNCONFIGURED, UNCONFIGURED, UNCONFIGURED,
- UNCONFIGURED, UNCONFIGURED, UNCONFIGURED, UNCONFIGURED, UNCONFIGURED, UNCONFIGURED, UNCONFIGURED, UNCONFIGURED
- };
- uint8_t col_mapping[MATRIX_COLS] = {
- 8, 9, 10, 11, 12, 13, 14, 15,
- 16, 17, 18, 19, 20, 21, 22, 23,
- 24, 25, 26, 27, 28, 29, 30, 31
- };
- uint8_t row_max_count = MUX_PORTS * 1;
- uint8_t col_max_count = MUX_PORTS * (MUX_COUNT - 1);
- uint16_t shift_out_cache = 0;
-
- void kimera_init(void)
- {
- // read config
- if (read_matrix_mapping()) {
- write_matrix_mapping();
- }
-
- // init shift out pins
- MOSI_DDR |= (1<<MOSI_BIT);
- SCK_DDR |= (1<<SCK_BIT);
- RCK_DDR |= (1<<RCK_BIT);
- RCK_PORT |= (1<<RCK_BIT);
-
- // init spi
- SPCR |= ((1<<SPE) | (1<<MSTR));
- SPSR |= ((1<<SPI2X));
- }
-
- uint8_t read_matrix_mapping(void)
- {
- uint8_t error = 0;
- uint8_t mux_config = 0;
- row_max_count = 0;
- col_max_count = 0;
-
- mux_config = eeprom_read_byte(EECONFIG_MUX_MAPPING);
- if (mux_config & (1<<7)) {
- error++;
- return error;
- }
-
- for (uint8_t i = 0; i < MUX_COUNT; i++) {
- mux_mapping[i] = mux_config & (1<<i);
- if (mux_mapping[i] == MUX_FOR_COL) {
- col_max_count += MUX_PORTS;
- }
- else {
- row_max_count += MUX_PORTS;
- }
- }
- if ((col_max_count == 0) || (row_max_count == 0)) {
- error++;
- }
-
- uint8_t *mapping = EECONFIG_ROW_COL_MAPPING;
- for (uint8_t i = 0; i < row_max_count; i++) {
- row_mapping[i] = eeprom_read_byte(mapping++);
- if (row_mapping[i] != UNCONFIGURED) {
- if (mux_mapping[PX_TO_MUX(row_mapping[i])] != MUX_FOR_ROW) {
- row_mapping[i] = UNCONFIGURED;
- error++;
- }
- }
- }
- for (uint8_t i = 0; i < col_max_count; i++) {
- col_mapping[i] = eeprom_read_byte(mapping++);
- if (col_mapping[i] != UNCONFIGURED) {
- if (mux_mapping[PX_TO_MUX(col_mapping[i])] != MUX_FOR_COL) {
- col_mapping[i] = UNCONFIGURED;
- error++;
- }
- }
- }
-
- return error;
- }
-
- void write_matrix_mapping(void)
- {
- uint8_t mux_config = 0;
- row_max_count = 0;
- col_max_count = 0;
-
- for (uint8_t i = 0; i < MUX_COUNT; i++) {
- mux_config |= (mux_mapping[i] << i);
- if (mux_mapping[i] == MUX_FOR_COL) {
- col_max_count += MUX_PORTS;
- }
- else {
- row_max_count += MUX_PORTS;
- }
- }
- eeprom_write_byte(EECONFIG_MUX_MAPPING, mux_config);
-
- uint8_t *mapping = EECONFIG_ROW_COL_MAPPING;
- for (uint8_t i = 0; i < row_max_count; i++) {
- eeprom_write_byte(mapping++, row_mapping[i]);
- }
- for (uint8_t i = 0; i < col_max_count; i++) {
- eeprom_write_byte(mapping++, col_mapping[i]);
- }
- }
-
- void shift_out_word(uint16_t data)
- {
- SPDR = (data & 0xFF);
- while (!(SPSR & (1<<SPIF)));
- SPDR = ((data>>8) & 0xFF);
- while (!(SPSR & (1<<SPIF)));
- RCK_PORT &= ~(1<<RCK_BIT);
- RCK_PORT |= (1<<RCK_BIT);
- }
-
- void init_cols(void)
- {
- // init mux io pins
- for (uint8_t i = 0; i < MUX_COUNT; i++) {
- if (mux_mapping[i] == MUX_FOR_COL) {
- ZX_DDR &= ~(1 << zx_bit[i]);
- ZX_PORT |= (1 << zx_bit[i]);
- }
- else {
- ZX_DDR |= (1 << zx_bit[i]);
- ZX_PORT |= (1 << zx_bit[i]);
- }
- }
- }
-
- matrix_row_t read_cols(void)
- {
- matrix_row_t cols = 0;
- for (uint8_t i = 0; i < MATRIX_COLS; i++) {
- uint8_t px = col_mapping[i];
- if (px != UNCONFIGURED) {
- shift_out_word(shift_out_cache | px_to_shift_out[px]);
- // TODO: delay
- if (!(ZX_PIN & (1 << zx_bit[PX_TO_MUX(px)]))) {
- cols |= (1 << i);
- }
- }
- }
- return cols;
- }
-
- void unselect_rows(void)
- {
- shift_out_word(0);
- }
-
- void select_row(uint8_t row)
- {
- uint8_t px = row_mapping[row];
- if (px != UNCONFIGURED) {
- ZX_PORT &= ~(1 << zx_bit[PX_TO_MUX(px)]);
- shift_out_cache = px_to_shift_out[px] | mux_inh_to_shift_out[PX_TO_MUX(px)];
- shift_out_word(shift_out_cache);
- }
- }
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