96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
|
// Copyright 2023 Kyle McCreery
|
||
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
|
||
|
|
#include "matrix.h"
|
||
|
|
#include "mcp23018.h"
|
||
|
|
#include "wait.h"
|
||
|
|
#include "debug.h"
|
||
|
|
#include "encoder.h"
|
||
|
|
|
||
|
|
#define I2C_ADDR 0x20
|
||
|
|
#define ROW_POS { 0b01000000, 0b10000000, 0b01000000, 0b10000000, 0b00000100, 0b00010000, 0b00100000, 0b00000010, 0b00001000 }
|
||
|
|
|
||
|
|
static uint8_t mcp23018_errors = 0;
|
||
|
|
|
||
|
|
static void mcp23018_init_cols(void) {
|
||
|
|
mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTA, ALL_INPUT);
|
||
|
|
mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTB, ALL_INPUT);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void mcp23018_scan(void) {
|
||
|
|
if (!mcp23018_errors) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
static uint16_t mcp23018_reset_loop = 0;
|
||
|
|
if (++mcp23018_reset_loop > 0x1FFF) {
|
||
|
|
// tuned to about 5s given the current scan rate
|
||
|
|
dprintf("trying to reset mcp23018\n");
|
||
|
|
mcp23018_reset_loop = 0;
|
||
|
|
mcp23018_errors = 0;
|
||
|
|
mcp23018_init_cols();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static matrix_row_t read_cols(void) {
|
||
|
|
if (mcp23018_errors) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint8_t ret = 0xFF; // sets all to 1
|
||
|
|
mcp23018_errors += !mcp23018_readPins(I2C_ADDR, mcp23018_PORTB, &ret); // will update with values 0 = pulled down by connection, 1 = pulled up by pullup resistors
|
||
|
|
|
||
|
|
return (~ret) & 0b00111111; // Clears out the two row bits in the B buffer.
|
||
|
|
}
|
||
|
|
|
||
|
|
static void select_row(uint8_t row) {
|
||
|
|
uint8_t row_pos[MATRIX_ROWS] = ROW_POS;
|
||
|
|
if (mcp23018_errors) {
|
||
|
|
// wait to mimic i2c interactions
|
||
|
|
//wait_us(100);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (row > 1) {
|
||
|
|
mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTB, ALL_INPUT);
|
||
|
|
mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTA, ~(row_pos[row]));
|
||
|
|
} else {
|
||
|
|
mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTA, ALL_INPUT);
|
||
|
|
mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTB, ~(row_pos[row]));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
|
||
|
|
// Store last value of row prior to reading
|
||
|
|
matrix_row_t last_row_value = current_matrix[current_row];
|
||
|
|
|
||
|
|
// Clear data in matrix row
|
||
|
|
current_matrix[current_row] = 0;
|
||
|
|
|
||
|
|
// Select row and wait for row selection to stabilize
|
||
|
|
select_row(current_row);
|
||
|
|
// Skip the wait_us(30); as i2c is slow enough to debounce the io changes
|
||
|
|
|
||
|
|
current_matrix[current_row] = read_cols();
|
||
|
|
|
||
|
|
return (last_row_value != current_matrix[current_row]);
|
||
|
|
}
|
||
|
|
|
||
|
|
void matrix_init_custom(void) {
|
||
|
|
mcp23018_init(I2C_ADDR);
|
||
|
|
mcp23018_init_cols();
|
||
|
|
}
|
||
|
|
|
||
|
|
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
|
||
|
|
mcp23018_scan();
|
||
|
|
|
||
|
|
bool changed = false;
|
||
|
|
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
|
||
|
|
changed |= read_cols_on_row(current_matrix, current_row);
|
||
|
|
#ifdef ENCODER_ENABLE
|
||
|
|
encoder_read();
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
return changed;
|
||
|
|
}
|