qmk_firmware

matrix.c (6490B)

---

 /*
 
 Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
 
 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 "matrix.h"
 #include <stdint.h>
 #include <stdbool.h>
 #include <avr/io.h>
 #include "wait.h"
 #include "action_layer.h"
 #include "print.h"
 #include "debug.h"
 #include "util.h"
 #include "debounce.h"
 #include "gergoplex.h"
 
 #ifdef BALLER
 #    include <avr/interrupt.h>
 #    include "pointing_device.h"
 #endif
 
 #ifndef DEBOUNCE
 #    define DEBOUNCE 5
 #endif
 
 // ATmega pin defs
 #define COL1 (1 << 6)
 #define COL2 (1 << 5)
 #define COL3 (1 << 4)
 #define COL4 (1 << 1)
 
 /* matrix state(1:on, 0:off) */
 static matrix_row_t matrix[MATRIX_ROWS];
 /*
  * matrix state(1:on, 0:off)
  * contains the raw values without debounce filtering of the last read cycle.
  */
 static matrix_row_t raw_matrix[MATRIX_ROWS];
 
 static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
 // Right-hand side only pins, the left side is controlled my MCP
 static const pin_t row_pins[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS;
 
 // Debouncing: store for each key the number of scans until it's eligible to
 // change.  When scanning the matrix, ignore any changes in keys that have
 // already changed in the last DEBOUNCE scans.
 
 static matrix_row_t read_cols(uint8_t row);
 static void         init_cols(void);
 static void         unselect_rows(void);
 static void         select_row(uint8_t row);
 
 static uint8_t mcp23018_reset_loop;
 
 __attribute__((weak)) void matrix_init_user(void) {}
 __attribute__((weak)) void matrix_scan_user(void) {}
 __attribute__((weak)) void matrix_scan_kb(void) {
     matrix_scan_user();
 }
 
 void matrix_init(void) {
     // initialize row and col
     mcp23018_status = init_mcp23018();
     unselect_rows();
     init_cols();
 
     // initialize matrix state: all keys off
     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
         matrix[i]     = 0;
         raw_matrix[i] = 0;
     }
 
     debounce_init();
     matrix_init_kb();
 }
 void matrix_power_up(void) {
     mcp23018_status = init_mcp23018();
 
     unselect_rows();
     init_cols();
 
     // initialize matrix state: all keys off
     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
         matrix[i] = 0;
     }
 }
 
 // Reads and stores a row, returning
 // whether a change occurred.
 static inline bool store_raw_matrix_row(uint8_t index) {
     matrix_row_t temp = read_cols(index);
     if (raw_matrix[index] != temp) {
         raw_matrix[index] = temp;
         return true;
     }
     return false;
 }
 uint8_t matrix_scan(void) {
     if (mcp23018_status) { // if there was an error
         if (++mcp23018_reset_loop == 0) {
             // if (++mcp23018_reset_loop >= 1300) {
             // since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
             // this will be approx bit more frequent than once per second
             print("trying to reset mcp23018\n");
             mcp23018_status = init_mcp23018();
             if (mcp23018_status) {
                 print("left side not responding\n");
             } else {
                 print("left side attached\n");
             }
         }
     }
 
     bool changed = false;
     for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
         // select rows from left and right hands
         uint8_t left_index  = i;
         uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
         select_row(left_index);
         select_row(right_index);
 
         // we don't need a 30us delay anymore, because selecting a
         // left-hand row requires more than 30us for i2c.
 
         changed |= store_raw_matrix_row(left_index);
         changed |= store_raw_matrix_row(right_index);
 
         unselect_rows();
     }
 
     debounce(raw_matrix, matrix, changed);
     matrix_scan_kb();
 
 #ifdef DEBUG_MATRIX
     for (uint8_t c = 0; c < MATRIX_COLS; c++)
         for (uint8_t r = 0; r < MATRIX_ROWS; r++)
             if (matrix_is_on(r, c)) xprintf("r:%d c:%d \n", r, c);
 #endif
 
     return 1;
 }
 
 inline bool matrix_is_on(uint8_t row, uint8_t col) {
     return (matrix[row] & ((matrix_row_t)1 << col));
 }
 inline matrix_row_t matrix_get_row(uint8_t row) {
     return matrix[row];
 }
 
 void matrix_print(void) {
     print("\nr/c 0123456789ABCDEF\n");
     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
         print_hex8(row);
         print(": ");
         print_bin_reverse16(matrix_get_row(row));
         print("\n");
     }
 }
 
 // Remember this means ROWS
 static void init_cols(void) {
     for (uint8_t col = 0; col < MATRIX_COLS; col++) {
         gpio_set_pin_input_high(col_pins[col]);
     }
 }
 
 static matrix_row_t read_cols(uint8_t row) {
     if (row < 5) {
         if (mcp23018_status) { // if there was an error
             return 0;
         } else {
             uint8_t data    = 0;
             mcp23018_status = i2c_receive(I2C_ADDR, &data, 1, I2C_TIMEOUT);
 #ifdef DEBUG_MATRIX
             if (~data != 0x00) xprintf("I2C: %d\n", ~data);
 #endif
             return ~data;
         }
     } else {
         return ~((((PINF & COL4) >> 1) | ((PINF & (COL1 | COL2 | COL3)) >> 3)) & 0xF);
     }
 }
 
 // Row pin configuration
 static void unselect_rows(void) {
     // no need to unselect on mcp23018, because the select step sets all
     // the other row bits high, and it's not changing to a different direction
 
     for (uint8_t row = 0; row < MATRIX_ROWS_PER_SIDE; row++) {
         gpio_set_pin_input(row_pins[row]);
         gpio_write_pin_low(row_pins[row]);
     }
 }
 
 static void select_row(uint8_t row) {
     if (row < 5) {
         // select on mcp23018
         if (mcp23018_status) { // do nothing on error
         } else {               // set active row low  : 0 // set other rows hi-Z : 1
             uint8_t data;
             data            = 0xFF & ~(1 << (row + 1));
             mcp23018_status = i2c_write_register(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
         }
     } else {
         gpio_set_pin_output(row_pins[row - MATRIX_ROWS_PER_SIDE]);
         gpio_write_pin_low(row_pins[row - MATRIX_ROWS_PER_SIDE]);
     }
 }