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Add MUX diagnostic commands and GPIO probe

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Serial commands:
- dump: show button and LED state
- ledon/ledoff: toggle all LEDs
- ledtest: sequential LED test
- read: raw button read
- probe: check pin states and test LD toggle
This commit is contained in:
Ashley Strahle
2026-06-23 13:33:00 +00:00
parent 81cd2b41fd
commit 2dfd016b76
2 changed files with 89 additions and 15 deletions
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src/pixel_stomp_mux.cpp
+34 -14
View File
@@ -1,8 +1,6 @@
#include "pixel_stomp_mux.h"
#include <Arduino.h>
static const char* TAG = "MUX";
PixelStompMux::PixelStompMux(uint8_t dat, uint8_t ld, uint8_t clk, uint8_t di)
: pin_dat(dat), pin_ld(ld), pin_clk(clk), pin_di(di),
last_button_state(0), current_led_state(0) {
@@ -20,13 +18,31 @@ void PixelStompMux::begin() {
Serial.printf("[MUX] Init DAT=%d LD=%d CLK=%d DI=%d\n",
pin_dat, pin_ld, pin_clk, pin_di);
Serial.println("[MUX] GPIO probe:");
Serial.printf(" DI (GPIO %d) reads: %d (should be 1 with pullup)\n",
pin_di, digitalRead(pin_di));
for (int i = 0; i < 3; i++) {
digitalWrite(pin_clk, HIGH);
delayMicroseconds(10);
digitalWrite(pin_clk, LOW);
delayMicroseconds(10);
}
Serial.printf(" DI after 3 CLK pulses: %d\n", digitalRead(pin_di));
digitalWrite(pin_ld, HIGH);
delayMicroseconds(10);
digitalWrite(pin_ld, LOW);
delayMicroseconds(10);
Serial.printf(" DI after LD pulse: %d\n", digitalRead(pin_di));
}
uint16_t PixelStompMux::read_buttons() {
pulse_pin(pin_ld, HIGH);
delayMicroseconds(5);
delayMicroseconds(10);
pulse_pin(pin_ld, LOW);
delayMicroseconds(5);
delayMicroseconds(10);
uint16_t state = shift_in(NUM_INPUTS);
last_button_state = state;
@@ -44,8 +60,9 @@ bool PixelStompMux::is_button_pressed(uint8_t index) {
void PixelStompMux::write_leds(uint16_t led_state) {
current_led_state = led_state;
shift_out(led_state, NUM_OUTPUTS);
pulse_pin(pin_ld, HIGH);
delayMicroseconds(5);
delayMicroseconds(10);
pulse_pin(pin_ld, LOW);
}
@@ -73,19 +90,20 @@ void PixelStompMux::dump() {
for (int i = 0; i < NUM_INPUTS; i++) {
bool pressed = !(buttons & (1 << i));
bool led_on = current_led_state & (1 << i);
if (pressed || led_on) {
Serial.printf(" [%d] Button:%s LED:%s\n", i,
pressed ? "PRESS" : "off",
led_on ? "ON" : "off");
}
Serial.printf(" [%d] Button:%s LED:%s\n", i,
pressed ? "PRESS" : "off",
led_on ? "ON" : "off");
}
}
void PixelStompMux::shift_out(uint16_t data, uint8_t bits) {
for (int i = bits - 1; i >= 0; i--) {
digitalWrite(pin_dat, (data >> i) & 1);
pulse_pin(pin_clk, HIGH);
pulse_pin(pin_clk, LOW);
delayMicroseconds(1);
digitalWrite(pin_clk, HIGH);
delayMicroseconds(1);
digitalWrite(pin_clk, LOW);
delayMicroseconds(1);
}
}
@@ -97,8 +115,10 @@ uint16_t PixelStompMux::shift_in(uint8_t bits) {
if (bit) {
data |= (1 << i);
}
pulse_pin(pin_clk, HIGH);
pulse_pin(pin_clk, LOW);
digitalWrite(pin_clk, HIGH);
delayMicroseconds(1);
digitalWrite(pin_clk, LOW);
delayMicroseconds(1);
}
return data;