ezri/qmk_firmware
1
0
Fork 0
Code Issues Pull Requests Actions 2 Packages Projects Releases Wiki Activity

fl16: Dynamic threshold

Browse Source 
based on keys pressed in one row of the matrix

Signed-off-by: Daniel Schaefer <dhs@frame.work>
This commit is contained in:
Daniel Schaefer 2023-11-10 12:48:25 +08:00
parent ff5e181afd
commit 771d183c1a
1 changed files with 34 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
keyboards/framework/matrix.c
View File

@ -126,7 +126,7 @@ static void mux_select_row(int row) {
/**
* Based on the ADC value, update the matrix for this column
* */
static bool interpret_adc_row(matrix_row_t cur_matrix[], adc10ksample_t voltage, int col, int row) {
static bool interpret_adc_row(matrix_row_t cur_matrix[], adc10ksample_t voltage, int col, int row, adc10ksample_t threshold) {
bool changed = false;
// By default the voltage is high (3.3V)
@ -135,7 +135,7 @@ static bool interpret_adc_row(matrix_row_t cur_matrix[], adc10ksample_t voltage,
// changes the voltage at every key again. So we can't check for a specific
// voltage but need to have a threshold.
bool key_state = false;
if (voltage < ADC_THRESHOLD) {
if (voltage < threshold) {
key_state = true;
}
@ -314,6 +314,8 @@ bool handle_idle(void) {
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
bool changed = false;
adc10ksample_t voltages[MATRIX_ROWS][MATRIX_COLS] = {};
if (handle_idle()) {
return false;
}
@ -338,14 +340,42 @@ bool matrix_scan_custom(matrix_row_t current_matrix[]) {
// Wait for column select to settle and propagate to ADC
//wait_us(500 * 1000);
// Interpret ADC value as rows
changed |= interpret_adc_row(current_matrix, read_adc(), col, row);
voltages[row][col] = read_adc();
}
// Drive column high again
drive_col(col, true);
}
for (int row = 0; row < MATRIX_ROWS; row++) {
uint8_t pressed_in_row = 0;
for (int col = 0; col < MATRIX_COLS; col++) {
if (voltages[row][col] < ADC_THRESHOLD) {
pressed_in_row += 1;
}
}
for (int col = 0; col < MATRIX_COLS; col++) {
adc10ksample_t threshold = ADC_THRESHOLD;
switch (pressed_in_row) {
case 0:
case 1:
threshold = 10000; // 1.0V
break;
case 2:
threshold = 20000; // 2.0V
break;
case 3:
threshold = 25000; // 2.5V
break;
default:
threshold = ADC_THRESHOLD;
break;
}
// Interpret ADC value as rows
changed |= interpret_adc_row(current_matrix, voltages[row][col], col, row, threshold);
}
}
return changed;
}