You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
318 lines
12 KiB
318 lines
12 KiB
/* Copyright 2023 Cipulot
|
|
*
|
|
* 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 3 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 "ec_switch_matrix.h"
|
|
#include "analog.h"
|
|
#include "atomic_util.h"
|
|
#include "math.h"
|
|
#include "print.h"
|
|
#include "wait.h"
|
|
|
|
#if defined(__AVR__)
|
|
# error "AVR platforms not supported due to a variety of reasons. Among them there are limited memory, limited number of pins and ADC not being able to give satisfactory results."
|
|
#endif
|
|
|
|
#define OPEN_DRAIN_SUPPORT defined(PAL_MODE_OUTPUT_OPENDRAIN)
|
|
|
|
eeprom_ec_config_t eeprom_ec_config;
|
|
ec_config_t ec_config;
|
|
|
|
// Pin and port array
|
|
const pin_t row_pins[] = MATRIX_ROW_PINS;
|
|
const pin_t amux_sel_pins[] = AMUX_SEL_PINS;
|
|
const pin_t amux_en_pins[] = AMUX_EN_PINS;
|
|
const pin_t amux_n_col_sizes[] = AMUX_COL_CHANNELS_SIZES;
|
|
const pin_t amux_n_col_channels[][AMUX_MAX_COLS_COUNT] = {AMUX_COL_CHANNELS};
|
|
|
|
#define AMUX_SEL_PINS_COUNT ARRAY_SIZE(amux_sel_pins)
|
|
#define EXPECTED_AMUX_SEL_PINS_COUNT ceil(log2(AMUX_MAX_COLS_COUNT)
|
|
// Checks for the correctness of the configuration
|
|
_Static_assert(ARRAY_SIZE(amux_en_pins) == AMUX_COUNT, "AMUX_EN_PINS doesn't have the minimum number of bits required to enable all the multiplexers available");
|
|
// Check that number of select pins is enough to select all the channels
|
|
_Static_assert(AMUX_SEL_PINS_COUNT == EXPECTED_AMUX_SEL_PINS_COUNT), "AMUX_SEL_PINS doesn't have the minimum number of bits required address all the channels");
|
|
// Check that number of elements in AMUX_COL_CHANNELS_SIZES is enough to specify the number of channels for all the multiplexers available
|
|
_Static_assert(ARRAY_SIZE(amux_n_col_sizes) == AMUX_COUNT, "AMUX_COL_CHANNELS_SIZES doesn't have the minimum number of elements required to specify the number of channels for all the multiplexers available");
|
|
|
|
static uint16_t sw_value[MATRIX_ROWS][MATRIX_COLS];
|
|
|
|
static adc_mux adcMux;
|
|
|
|
// Initialize the row pins
|
|
void init_row(void) {
|
|
// Set all row pins as output and low
|
|
for (uint8_t idx = 0; idx < MATRIX_ROWS; idx++) {
|
|
setPinOutput(row_pins[idx]);
|
|
writePinLow(row_pins[idx]);
|
|
}
|
|
}
|
|
|
|
// Initialize the multiplexers
|
|
void init_amux(void) {
|
|
for (uint8_t idx = 0; idx < AMUX_COUNT; idx++) {
|
|
setPinOutput(amux_en_pins[idx]);
|
|
writePinLow(amux_en_pins[idx]);
|
|
}
|
|
for (uint8_t idx = 0; idx < AMUX_SEL_PINS_COUNT; idx++) {
|
|
setPinOutput(amux_sel_pins[idx]);
|
|
}
|
|
}
|
|
|
|
// Select the multiplexer channel of the specified multiplexer
|
|
void select_amux_channel(uint8_t channel, uint8_t col) {
|
|
// Get the channel for the specified multiplexer
|
|
uint8_t ch = amux_n_col_channels[channel][col];
|
|
// momentarily disable specified multiplexer
|
|
gpio_write_pin_high(amux_en_pins[channel]);
|
|
// Select the multiplexer channel
|
|
for (uint8_t i = 0; i < AMUX_SEL_PINS_COUNT; i++) {
|
|
writePin(amux_sel_pins[i], ch & (1 << i));
|
|
}
|
|
// re enable specified multiplexer
|
|
writePinLow(amux_en_pins[channel]);
|
|
}
|
|
|
|
// Disable all the unused multiplexers
|
|
void disable_unused_amux(uint8_t channel) {
|
|
// disable all the other multiplexers apart from the current selected one
|
|
for (uint8_t idx = 0; idx < AMUX_COUNT; idx++) {
|
|
if (idx != channel) {
|
|
gpio_write_pin_high(amux_en_pins[idx]);
|
|
}
|
|
}
|
|
}
|
|
// Discharge the peak hold capacitor
|
|
void discharge_capacitor(void) {
|
|
#ifdef OPEN_DRAIN_SUPPORT
|
|
writePinLow(DISCHARGE_PIN);
|
|
#else
|
|
writePinLow(DISCHARGE_PIN);
|
|
setPinOutput(DISCHARGE_PIN);
|
|
#endif
|
|
}
|
|
|
|
// Charge the peak hold capacitor
|
|
void charge_capacitor(uint8_t row) {
|
|
#ifdef OPEN_DRAIN_SUPPORT
|
|
gpio_write_pin_high(DISCHARGE_PIN);
|
|
#else
|
|
setPinInput(DISCHARGE_PIN);
|
|
#endif
|
|
gpio_write_pin_high(row_pins[row]);
|
|
}
|
|
|
|
// Initialize the peripherals pins
|
|
int ec_init(void) {
|
|
// Initialize ADC
|
|
palSetLineMode(ANALOG_PORT, PAL_MODE_INPUT_ANALOG);
|
|
adcMux = pinToMux(ANALOG_PORT);
|
|
|
|
// Dummy call to make sure that adcStart() has been called in the appropriate state
|
|
adc_read(adcMux);
|
|
|
|
// Initialize discharge pin as discharge mode
|
|
writePinLow(DISCHARGE_PIN);
|
|
#ifdef OPEN_DRAIN_SUPPORT
|
|
setPinOutputOpenDrain(DISCHARGE_PIN);
|
|
#else
|
|
setPinOutput(DISCHARGE_PIN);
|
|
#endif
|
|
|
|
// Initialize drive lines
|
|
init_row();
|
|
|
|
// Initialize AMUXs
|
|
init_amux();
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Get the noise floor
|
|
void ec_noise_floor(void) {
|
|
// Initialize the noise floor
|
|
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
|
|
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
|
|
ec_config.noise_floor[row][col] = 0;
|
|
}
|
|
}
|
|
|
|
// Sample the noise floor
|
|
for (uint8_t i = 0; i < DEFAULT_NOISE_FLOOR_SAMPLING_COUNT; i++) {
|
|
for (uint8_t amux = 0; amux < AMUX_COUNT; amux++) {
|
|
disable_unused_amux(amux);
|
|
for (uint8_t col = 0; col < amux_n_col_sizes[amux]; col++) {
|
|
uint8_t sum = 0;
|
|
for (uint8_t i = 0; i < (amux > 0 ? amux : 0); i++)
|
|
sum += amux_n_col_sizes[i];
|
|
uint8_t adjusted_col = col + sum;
|
|
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
|
|
ec_config.noise_floor[row][adjusted_col] += ec_readkey_raw(amux, row, col);
|
|
}
|
|
}
|
|
}
|
|
wait_ms(5);
|
|
}
|
|
|
|
// Average the noise floor
|
|
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
|
|
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
|
|
ec_config.noise_floor[row][col] /= DEFAULT_NOISE_FLOOR_SAMPLING_COUNT;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Scan key values and update matrix state
|
|
bool ec_matrix_scan(matrix_row_t current_matrix[]) {
|
|
bool updated = false;
|
|
|
|
for (uint8_t amux = 0; amux < AMUX_COUNT; amux++) {
|
|
disable_unused_amux(amux);
|
|
for (uint8_t col = 0; col < amux_n_col_sizes[amux]; col++) {
|
|
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
|
|
uint8_t sum = 0;
|
|
for (uint8_t i = 0; i < (amux > 0 ? amux : 0); i++)
|
|
sum += amux_n_col_sizes[i];
|
|
uint8_t adjusted_col = col + sum;
|
|
sw_value[row][adjusted_col] = ec_readkey_raw(amux, row, col);
|
|
|
|
if (ec_config.bottoming_calibration) {
|
|
if (ec_config.bottoming_calibration_starter[row][adjusted_col]) {
|
|
ec_config.bottoming_reading[row][adjusted_col] = sw_value[row][adjusted_col];
|
|
ec_config.bottoming_calibration_starter[row][adjusted_col] = false;
|
|
} else if (sw_value[row][adjusted_col] > ec_config.bottoming_reading[row][adjusted_col]) {
|
|
ec_config.bottoming_reading[row][adjusted_col] = sw_value[row][adjusted_col];
|
|
}
|
|
} else {
|
|
updated |= ec_update_key(¤t_matrix[row], row, adjusted_col, sw_value[row][adjusted_col]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return ec_config.bottoming_calibration ? false : updated;
|
|
}
|
|
|
|
// Read the capacitive sensor value
|
|
uint16_t ec_readkey_raw(uint8_t channel, uint8_t row, uint8_t col) {
|
|
uint16_t sw_value = 0;
|
|
|
|
// Select the multiplexer
|
|
select_amux_channel(channel, col);
|
|
|
|
// Set the row pin to low state to avoid ghosting
|
|
writePinLow(row_pins[row]);
|
|
|
|
ATOMIC_BLOCK_FORCEON {
|
|
// Set the row pin to high state and have capacitor charge
|
|
charge_capacitor(row);
|
|
// Read the ADC value
|
|
sw_value = adc_read(adcMux);
|
|
}
|
|
// Discharge peak hold capacitor
|
|
discharge_capacitor();
|
|
// Waiting for the ghost capacitor to discharge fully
|
|
wait_us(DISCHARGE_TIME);
|
|
|
|
return sw_value;
|
|
}
|
|
|
|
// Update press/release state of key
|
|
bool ec_update_key(matrix_row_t* current_row, uint8_t row, uint8_t col, uint16_t sw_value) {
|
|
bool current_state = (*current_row >> col) & 1;
|
|
|
|
// Real Time Noise Floor Calibration
|
|
if (sw_value < (ec_config.noise_floor[row][col] - NOISE_FLOOR_THRESHOLD)) {
|
|
uprintf("Noise Floor Change: %d, %d, %d\n", row, col, sw_value);
|
|
ec_config.noise_floor[row][col] = sw_value;
|
|
ec_config.rescaled_mode_0_actuation_threshold[row][col] = rescale(ec_config.mode_0_actuation_threshold, 0, 1023, ec_config.noise_floor[row][col], eeprom_ec_config.bottoming_reading[row][col]);
|
|
ec_config.rescaled_mode_0_release_threshold[row][col] = rescale(ec_config.mode_0_release_threshold, 0, 1023, ec_config.noise_floor[row][col], eeprom_ec_config.bottoming_reading[row][col]);
|
|
ec_config.rescaled_mode_1_initial_deadzone_offset[row][col] = rescale(ec_config.mode_1_initial_deadzone_offset, 0, 1023, ec_config.noise_floor[row][col], eeprom_ec_config.bottoming_reading[row][col]);
|
|
}
|
|
|
|
// Normal board-wide APC
|
|
if (ec_config.actuation_mode == 0) {
|
|
if (current_state && sw_value < ec_config.rescaled_mode_0_release_threshold[row][col]) {
|
|
*current_row &= ~(1 << col);
|
|
uprintf("Key released: %d, %d, %d\n", row, col, sw_value);
|
|
return true;
|
|
}
|
|
if ((!current_state) && sw_value > ec_config.rescaled_mode_0_actuation_threshold[row][col]) {
|
|
*current_row |= (1 << col);
|
|
uprintf("Key pressed: %d, %d, %d\n", row, col, sw_value);
|
|
return true;
|
|
}
|
|
}
|
|
// Rapid Trigger
|
|
else if (ec_config.actuation_mode == 1) {
|
|
// Is key in active zone?
|
|
if (sw_value > ec_config.rescaled_mode_1_initial_deadzone_offset[row][col]) {
|
|
// Is key pressed while in active zone?
|
|
if (current_state) {
|
|
// Is the key still moving down?
|
|
if (sw_value > ec_config.extremum[row][col]) {
|
|
ec_config.extremum[row][col] = sw_value;
|
|
uprintf("Key pressed: %d, %d, %d\n", row, col, sw_value);
|
|
}
|
|
// Has key moved up enough to be released?
|
|
else if (sw_value < ec_config.extremum[row][col] - ec_config.mode_1_release_offset) {
|
|
ec_config.extremum[row][col] = sw_value;
|
|
*current_row &= ~(1 << col);
|
|
uprintf("Key released: %d, %d, %d\n", row, col, sw_value);
|
|
return true;
|
|
}
|
|
}
|
|
// Key is not pressed while in active zone
|
|
else {
|
|
// Is the key still moving up?
|
|
if (sw_value < ec_config.extremum[row][col]) {
|
|
ec_config.extremum[row][col] = sw_value;
|
|
}
|
|
// Has key moved down enough to be pressed?
|
|
else if (sw_value > ec_config.extremum[row][col] + ec_config.mode_1_actuation_offset) {
|
|
ec_config.extremum[row][col] = sw_value;
|
|
*current_row |= (1 << col);
|
|
uprintf("Key pressed: %d, %d, %d\n", row, col, sw_value);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
// Key is not in active zone
|
|
else {
|
|
// Check to avoid key being stuck in pressed state near the active zone threshold
|
|
if (sw_value < ec_config.extremum[row][col]) {
|
|
ec_config.extremum[row][col] = sw_value;
|
|
*current_row &= ~(1 << col);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Print the matrix values
|
|
void ec_print_matrix(void) {
|
|
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
|
|
for (uint8_t col = 0; col < MATRIX_COLS - 1; col++) {
|
|
uprintf("%4d,", sw_value[row][col]);
|
|
}
|
|
uprintf("%4d\n", sw_value[row][MATRIX_COLS - 1]);
|
|
}
|
|
print("\n");
|
|
}
|
|
|
|
// Rescale the value to a different range
|
|
uint16_t rescale(uint16_t x, uint16_t in_min, uint16_t in_max, uint16_t out_min, uint16_t out_max) {
|
|
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
|
|
}
|