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/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <https://github.com/KarlK90> wrote this file. As long as you retain this
* notice you can do whatever you want with this stuff. If we meet some day, and
* you think this stuff is worth it, you can buy me a beer in return. KarlK90
* ----------------------------------------------------------------------------
*/
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include "util.h"
#include "matrix.h"
#include "debounce.h"
#include "quantum.h"
#include "split_util.h"
#include "config.h"
#include "transactions.h"
#define ERROR_DISCONNECT_COUNT 5
#define ROWS_PER_HAND (MATRIX_ROWS / 2)
static const pin_t row_pins[ROWS_PER_HAND] = MATRIX_ROW_PINS;
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
/* matrix state(1:on, 0:off) */
extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
// row offsets for each hand
uint8_t thisHand, thatHand;
// user-defined overridable functions
__attribute__((weak)) void matrix_slave_scan_kb(void) { matrix_slave_scan_user(); }
__attribute__((weak)) void matrix_slave_scan_user(void) {}
static void init_pins(void) {
for (size_t i = 0; i < MATRIX_COLS; i++) {
setPinInputHigh(col_pins[i]);
}
for (size_t i = 0; i < ROWS_PER_HAND; i++) {
setPinOutput(row_pins[i]);
writePinHigh(row_pins[i]);
}
}
void matrix_init(void) {
split_pre_init();
thisHand = isLeftHand ? 0 : (ROWS_PER_HAND);
thatHand = ROWS_PER_HAND - thisHand;
// initialize key pins
init_pins();
// initialize matrix state: all keys off
memset(raw_matrix, 0, sizeof(raw_matrix));
memset(matrix, 0, sizeof(matrix));
debounce_init(ROWS_PER_HAND);
matrix_init_quantum();
split_post_init();
}
bool matrix_post_scan(void) {
bool changed = false;
if (is_keyboard_master()) {
static uint8_t error_count;
matrix_row_t slave_matrix[ROWS_PER_HAND] = {0};
if (!transport_master(matrix + thisHand, slave_matrix)) {
error_count++;
if (error_count > ERROR_DISCONNECT_COUNT) {
// reset other half if disconnected
memset(&matrix[thatHand], 0, sizeof(slave_matrix));
memset(slave_matrix, 0, sizeof(slave_matrix));
changed = true;
}
} else {
error_count = 0;
if (memcmp(&matrix[thatHand], slave_matrix, sizeof(slave_matrix)) != 0) {
memcpy(&matrix[thatHand], slave_matrix, sizeof(slave_matrix));
changed = true;
}
}
matrix_scan_quantum();
} else {
transport_slave(matrix + thatHand, matrix + thisHand);
matrix_slave_scan_kb();
}
return changed;
}
uint8_t matrix_scan(void) {
bool local_changed = false;
matrix_row_t current_matrix[ROWS_PER_HAND];
for (size_t row_idx = 0; row_idx < ROWS_PER_HAND; row_idx++) {
/* Drive row pin low. */
ATOMIC_BLOCK_FORCEON { writePinLow(row_pins[row_idx]); }
matrix_output_select_delay();
/* Read all columns in one go, aka port scanning. */
uint16_t porta = palReadPort(GPIOA);
uint16_t portb = palReadPort(GPIOB);
/* Order of pins on the mun is: A0, B11, B0, B10, B12, B2, A8
Pin is active low, therefore we have to invert the result. */
matrix_row_t cols = ~(((porta & (0x1 << 0)) >> 0) // A0 (0)
| ((portb & (0x1 << 11)) >> 10) // B11 (1)
| ((portb & (0x1 << 0)) << 2) // B0 (2)
| ((portb & (0x1 << 10)) >> 7) // B10 (3)
| ((portb & (0x1 << 12)) >> 8) // B12 (4)
| ((portb & (0x1 << 2)) << 3) // B2 (5)
| ((porta & (0x1 << 8)) >> 2)); // A8 (6)
/* Reverse the order of columns for left hand as the board is flipped. */
// if (isLeftHand) {
// #if defined(__arm__)
// /* rbit assembly reverses bit order of 32bit registers. */
// uint32_t temp = cols;
// __asm__("rbit %0, %1" : "=r"(temp) : "r"(temp));
// cols = temp >> 24;
// #else
// /* RISC-V bit manipulation extension not present. Use bit-hack.
// https://graphics.stanford.edu/~seander/bithacks.html#ReverseByteWith32Bits */
// cols = (matrix_row_t)(((cols * 0x0802LU & 0x22110LU) | (cols * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16);
// #endif
// }
current_matrix[row_idx] = cols;
/* Drive row pin high again. */
ATOMIC_BLOCK_FORCEON { writePinHigh(row_pins[row_idx]); }
matrix_output_unselect_delay(row_idx, row_pins[row_idx] != 0);
}
if (memcmp(raw_matrix, current_matrix, sizeof(current_matrix)) != 0) {
memcpy(raw_matrix, current_matrix, sizeof(current_matrix));
local_changed = true;
}
debounce(raw_matrix, matrix + thisHand, ROWS_PER_HAND, local_changed);
bool remote_changed = matrix_post_scan();
return (uint8_t)(local_changed || remote_changed);
}
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