238 lines
6.7 KiB
C
238 lines
6.7 KiB
C
/*
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Copyright 2013 Oleg Kostyuk <cub.uanic@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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/*
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* scan matrix
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include "wait.h"
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#include "action_layer.h"
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#include "print.h"
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#include "debug.h"
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#include "util.h"
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#include "matrix.h"
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#include "debounce.h"
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#include "ergodox_ez.h"
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/*
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* This constant define not debouncing time in msecs, assuming eager_pr.
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*
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* On Ergodox matrix scan rate is relatively low, because of slow I2C.
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* Now it's only 317 scans/second, or about 3.15 msec/scan.
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* According to Cherry specs, debouncing time is 5 msec.
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*
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* However, some switches seem to have higher debouncing requirements, or
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* something else might be wrong. (Also, the scan speed has improved since
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* that comment was written.)
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*/
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/* matrix state(1:on, 0:off) */
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extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
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extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
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static matrix_row_t read_cols(uint8_t row);
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static void init_cols(void);
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static void unselect_rows(void);
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static void select_row(uint8_t row);
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static uint8_t mcp23018_reset_loop;
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void matrix_init_custom(void) {
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// initialize row and col
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mcp23018_status = init_mcp23018();
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unselect_rows();
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init_cols();
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}
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// Reads and stores a row, returning
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// whether a change occurred.
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static inline bool store_raw_matrix_row(uint8_t index) {
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matrix_row_t temp = read_cols(index);
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if (raw_matrix[index] != temp) {
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raw_matrix[index] = temp;
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return true;
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}
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return false;
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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if (mcp23018_status) { // if there was an error
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if (++mcp23018_reset_loop == 0) {
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print("trying to reset mcp23018\n");
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mcp23018_status = init_mcp23018();
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if (mcp23018_status) {
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print("left side not responding\n");
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} else {
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print("left side attached\n");
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ergodox_blink_all_leds();
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#ifdef RGB_MATRIX_ENABLE
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rgb_matrix_init(); // re-init driver on reconnect
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#endif
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}
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}
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}
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#ifdef LEFT_LEDS
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mcp23018_status = ergodox_left_leds_update();
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#endif // LEFT_LEDS
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bool changed = false;
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for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
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// select rows from left and right hands
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uint8_t left_index = i;
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uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
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select_row(left_index);
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select_row(right_index);
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changed |= store_raw_matrix_row(left_index);
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changed |= store_raw_matrix_row(right_index);
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unselect_rows();
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}
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return changed;
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}
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/* Column pin configuration
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*
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* Teensy
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* col: 0 1 2 3 4 5
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* pin: F0 F1 F4 F5 F6 F7
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*
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* MCP23018
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* col: 0 1 2 3 4 5
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* pin: B5 B4 B3 B2 B1 B0
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*/
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static void init_cols(void) {
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// init on mcp23018
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// not needed, already done as part of init_mcp23018()
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// init on teensy
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setPinInputHigh(F0);
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setPinInputHigh(F1);
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setPinInputHigh(F4);
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setPinInputHigh(F5);
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setPinInputHigh(F6);
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setPinInputHigh(F7);
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}
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static matrix_row_t read_cols(uint8_t row) {
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if (row < 7) {
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if (mcp23018_status) { // if there was an error
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return 0;
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} else {
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uint8_t data = 0;
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// reading GPIOB (column port) since in mcp23018's sequential mode
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// it is addressed directly after writing to GPIOA in select_row()
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mcp23018_status = i2c_start(I2C_ADDR_READ, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
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mcp23018_status = i2c_read_nack(ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status < 0) goto out;
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data = ~((uint8_t)mcp23018_status);
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mcp23018_status = I2C_STATUS_SUCCESS;
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out:
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i2c_stop();
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return data;
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}
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} else {
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/* read from teensy
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* bitmask is 0b11110011, but we want those all
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* in the lower six bits.
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* we'll return 1s for the top two, but that's harmless.
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*/
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return ~((PINF & 0x03) | ((PINF & 0xF0) >> 2));
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}
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}
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/* Row pin configuration
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*
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* Teensy
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* row: 7 8 9 10 11 12 13
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* pin: B0 B1 B2 B3 D2 D3 C6
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*
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* MCP23018
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* row: 0 1 2 3 4 5 6
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* pin: A0 A1 A2 A3 A4 A5 A6
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*/
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static void unselect_rows(void) {
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// no need to unselect on mcp23018, because the select step sets all
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// the other row bits high, and it's not changing to a different
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// direction
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// unselect on teensy
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setPinInput(B0);
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setPinInput(B1);
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setPinInput(B2);
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setPinInput(B3);
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setPinInput(D2);
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setPinInput(D3);
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setPinInput(C6);
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}
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static void select_row(uint8_t row) {
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if (row < 7) {
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// select on mcp23018
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if (!mcp23018_status) {
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// set active row low : 0
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// set other rows hi-Z : 1
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mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPIOA, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(0xFF & ~(1 << row), ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
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out:
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i2c_stop();
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}
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} else {
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// select on teensy
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// Output low(DDR:1, PORT:0) to select
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switch (row) {
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case 7:
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setPinOutput(B0);
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writePinLow(B0);
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break;
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case 8:
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setPinOutput(B1);
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writePinLow(B1);
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break;
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case 9:
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setPinOutput(B2);
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writePinLow(B2);
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break;
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case 10:
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setPinOutput(B3);
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writePinLow(B3);
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break;
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case 11:
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setPinOutput(D2);
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writePinLow(D2);
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break;
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case 12:
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setPinOutput(D3);
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writePinLow(D3);
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break;
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case 13:
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setPinOutput(C6);
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writePinLow(C6);
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break;
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}
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}
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}
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