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lotus: Basic ADC threshold

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Signed-off-by: Daniel Schaefer <dhs@frame.work>
This commit is contained in:
Daniel Schaefer 2022-12-26 00:56:05 +08:00
parent 74c4f623e1
commit 6f638fccf8
1 changed files with 15 additions and 3 deletions
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18
keyboards/lotus/matrix.c
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@ -8,6 +8,8 @@
#include "print.h"
#include "quantum.h"
#define ADC_THRESHOLD 3
/**
* Tell RP2040 ADC controller to initialize a specific GPIO for ADC input
*/
@ -78,10 +80,20 @@ static uint16_t adc_read(void) { return 0; }
static bool interpret_adc_row(matrix_row_t cur_matrix[], uint16_t adc_value, int col, int row) {
bool changed = false;
// TODO: Decode adc_value and set each row in this column
uint8_t key_state = 0;
// TODO: Convert adc value to voltage
uint16_t voltage = adc_value;
printf("Col %d - Row %d - ADC value:%04X\n", col, row, adc_value);
// By default the voltage is high (3.3V)
// When a key is pressed it causes the voltage to go down.
// But because every key is connected in a matrix, pressing multiple keys
// changes the voltage at every key again. So we can't check for a specific
// voltage but need to have a threshold.
uint8_t key_state = 0;
if (voltage < ADC_THRESHOLD) {
key_state = 1;
}
printf("Col %d - Row %d - ADC value:%04X, Voltage: %d\n", col, row, adc_value, voltage);
cur_matrix[row] |= key_state ? 0 : (1 << col);
return changed;