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118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
// Copyright 2019 Mathias Andersson <wraul@dbox.se>
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "matrix.h"
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#include "pca9555.h"
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#include "wait.h"
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/*
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* IC1 (PCA9555) IC2 (PCA9555)
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* ,----------. ,----------.
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* SDA --| SDA P00 |-- P1 SDA --| SDA P00 |-- P17
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* SCL --| SCL P01 |-- P2 SCL --| SCL P01 |-- P18
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* INT --| INT P02 |-- P3 INT --| INT P02 |-- P19
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* | P03 |-- P4 | P03 |-- P20
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* GND --| A0 P04 |-- P5 VCC --| A0 P04 |-- P21
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* SJ1 --| A1 P05 |-- P6 SJ1 --| A1 P05 |-- P22
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* GND --| A2 P06 |-- P7 GND --| A2 P06 |-- P23
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* | P07 |-- P8 | P07 |-- P24
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* | | | |
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* | P10 |-- P9 | P10 |-- P25
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* | P11 |-- P10 | P11 |-- P26
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* | P12 |-- P11 | P12 |-- P27
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* | P13 |-- P12 | P13 |-- P28
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* | P14 |-- P13 | P14 |-- P29
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* | P15 |-- P14 | P15 |-- P30
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* | P16 |-- P15 | P16 |-- P31
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* | P17 |-- P16 | P17 |-- P32
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* `----------' `----------'
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*/
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/*
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* | Row | Pin | | Col | Pin |
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* | --- | --- | | --- | --- |
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* | 0 | P1 | | 0 | P25 |
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* | 1 | P2 | | 1 | P26 |
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* | 2 | P3 | | 2 | P27 |
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* | 3 | P4 | | 3 | P28 |
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* | 4 | P5 | | 4 | P29 |
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* | 5 | P6 | | 5 | P30 |
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* | 6 | P7 | | 6 | P20 |
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* | 7 | P8 | | 7 | P21 |
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* | 8 | P22 |
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* | 9 | P23 |
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* | A | P24 |
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*/
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// PCA9555 slave addresses
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#define IC1 0x20
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#define IC2 0x21
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// PCA9555 column pin masks
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#define PORT0_COLS_MASK 0b11111000
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#define PORT1_COLS_MASK 0b00111111
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#define COLS_MASK 0b0000011111111111
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static void init_pins(void) {
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// init cols - IC2 port0 & IC2 port1 input
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pca9555_set_config(IC2, PCA9555_PORT0, ALL_INPUT);
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pca9555_set_config(IC2, PCA9555_PORT1, ALL_INPUT);
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// init rows - IC1 port0 output
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pca9555_set_config(IC1, PCA9555_PORT0, ALL_OUTPUT);
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pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH);
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}
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static void select_row(uint8_t row) {
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// All rows are on the same IC and port
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uint8_t mask = 1 << row;
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// set active row low : 0
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// set other rows hi-Z : 1
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pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH & (~mask));
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}
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static uint16_t read_cols(void) {
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uint8_t state_1 = 0;
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uint8_t state_2 = 0;
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pca9555_read_pins(IC2, PCA9555_PORT0, &state_1);
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pca9555_read_pins(IC2, PCA9555_PORT1, &state_2);
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uint16_t state = (((uint16_t)state_1 & PORT0_COLS_MASK) << 3) | (((uint16_t)state_2 & PORT1_COLS_MASK));
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// A low pin indicates an active column
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return (~state) & COLS_MASK;
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}
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static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[current_row];
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// Clear data in matrix row
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current_matrix[current_row] = 0;
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// Select row and wait for row selection to stabilize
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select_row(current_row);
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wait_us(30);
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current_matrix[current_row] = read_cols();
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// No need to unselect as `select_row` sets all the pins.
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return (last_row_value != current_matrix[current_row]);
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}
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void matrix_init_custom(void) {
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pca9555_init(IC1);
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pca9555_init(IC2);
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init_pins();
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool changed = false;
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for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
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changed |= read_cols_on_row(current_matrix, current_row);
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}
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return changed;
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}
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