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Add hardware probe and single-pixel test commands

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- probe: toggles LD/CLK, reads DI state at each step, tests single pixel
- pixel0/pixel1: single pixel at max brightness for testing
- Increased LD pulse timing to 20us
- Increased CLK timing to 2us
- NeoPixel brightness raised to 80
This commit is contained in:
Ashley Strahle
2026-06-23 13:45:37 +00:00
parent 07e5cd8994
commit 70097057fb
3 changed files with 72 additions and 10 deletions
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src/pixel_stomp_mux.cpp
+47 -8
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@@ -16,21 +16,22 @@ void PixelStompMux::begin() {
strip = new Adafruit_NeoPixel(NUM_LEDS, pin_dat, NEO_GRB + NEO_KHZ800);
strip->begin();
strip->setBrightness(50);
strip->setBrightness(80);
strip->clear();
strip->show();
Serial.printf("[MUX] Init DAT=%d LD=%d CLK=%d DI=%d\n",
pin_dat, pin_ld, pin_clk, pin_di);
Serial.printf("[MUX] 74HC165 for %d buttons, WS2812C for %d LEDs\n",
NUM_BUTTONS, NUM_LEDS);
Serial.printf("[MUX] 74HC165 x2 daisy-chain for %d buttons\n", NUM_BUTTONS);
Serial.printf("[MUX] WS2812C for %d LEDs\n", NUM_LEDS);
Serial.printf("[MUX] DI pin reads: %d\n", digitalRead(pin_di));
}
uint8_t PixelStompMux::read_buttons() {
digitalWrite(pin_ld, HIGH);
delayMicroseconds(5);
delayMicroseconds(20);
digitalWrite(pin_ld, LOW);
delayMicroseconds(5);
delayMicroseconds(20);
last_button_state = shift_in_74hc165();
return last_button_state;
@@ -65,7 +66,7 @@ void PixelStompMux::show() {
void PixelStompMux::dump() {
uint8_t buttons = read_buttons();
Serial.printf("[MUX] Buttons: 0x%02X (binary: ", buttons);
Serial.printf("[MUX] Buttons: 0x%02X (", buttons);
for (int i = 7; i >= 0; i--) {
Serial.print((buttons >> i) & 1);
}
@@ -85,10 +86,48 @@ uint8_t PixelStompMux::shift_in_74hc165() {
data |= (1 << i);
}
digitalWrite(pin_clk, HIGH);
delayMicroseconds(1);
delayMicroseconds(2);
digitalWrite(pin_clk, LOW);
delayMicroseconds(1);
delayMicroseconds(2);
}
return data;
}
void PixelStompMux::probe() {
Serial.println("[MUX] === Hardware Probe ===");
Serial.printf(" DI (GPIO %d) raw: %d\n", pin_di, digitalRead(pin_di));
Serial.println(" Testing LD pin...");
digitalWrite(pin_ld, LOW);
delayMicroseconds(10);
Serial.printf(" LD=LOW, DI=%d\n", digitalRead(pin_di));
digitalWrite(pin_ld, HIGH);
delayMicroseconds(10);
Serial.printf(" LD=HIGH, DI=%d\n", digitalRead(pin_di));
digitalWrite(pin_ld, LOW);
delayMicroseconds(10);
Serial.println(" Toggling CLK 16 times, reading DI...");
for (int i = 0; i < 16; i++) {
bool bit = digitalRead(pin_di);
Serial.printf(" CLK %2d: DI=%d\n", i, bit);
digitalWrite(pin_clk, HIGH);
delayMicroseconds(5);
digitalWrite(pin_clk, LOW);
delayMicroseconds(5);
}
Serial.println(" Testing NeoPixel DAT pin...");
if (strip) {
strip->setPixelColor(0, strip->Color(255, 255, 255));
strip->show();
Serial.println(" Set pixel 0 to WHITE - check if it lights up");
delay(1000);
strip->clear();
strip->show();
}
Serial.println("[MUX] === Probe Complete ===");
}