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Match BMC protocol: 5µs delays, read DI before CLK, WS2812+RGB, power limit

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This commit is contained in:
Ashley Strahle
2026-06-23 14:08:43 +00:00
parent 0db36a0129
commit 30b56a0b4c
1 changed files with 20 additions and 21 deletions
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src/pixel_stomp_mux.cpp
+20 -21
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@@ -1,7 +1,7 @@
#include "pixel_stomp_mux.h"
#include <Arduino.h>
#define ROXMUX_DELAY 2
#define BMC_MUX_74HC165_DELAY 5
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),
@@ -18,7 +18,8 @@ void PixelStompMux::begin() {
delay(100);
FastLED.addLeds<WS2812B, 9, GRB>(leds, NUM_LEDS);
FastLED.addLeds<WS2812, 9, RGB>(leds, NUM_LEDS);
FastLED.setMaxPowerInVoltsAndMilliamps(5, 500);
FastLED.setBrightness(128);
fill_solid(leds, NUM_LEDS, CRGB::Black);
FastLED.show();
@@ -30,20 +31,20 @@ void PixelStompMux::begin() {
uint8_t PixelStompMux::read_buttons() {
digitalWrite(pin_clk, LOW);
delayMicroseconds(ROXMUX_DELAY);
delayMicroseconds(BMC_MUX_74HC165_DELAY);
digitalWrite(pin_ld, LOW);
delayMicroseconds(ROXMUX_DELAY);
delayMicroseconds(BMC_MUX_74HC165_DELAY);
digitalWrite(pin_ld, HIGH);
delayMicroseconds(ROXMUX_DELAY);
delayMicroseconds(BMC_MUX_74HC165_DELAY);
uint8_t data = 0;
for (int i = 7; i >= 0; i--) {
digitalWrite(pin_clk, LOW);
delayMicroseconds(ROXMUX_DELAY);
bitWrite(data, i, digitalRead(pin_di));
digitalWrite(pin_clk, HIGH);
delayMicroseconds(ROXMUX_DELAY);
delayMicroseconds(BMC_MUX_74HC165_DELAY);
digitalWrite(pin_clk, LOW);
delayMicroseconds(BMC_MUX_74HC165_DELAY);
}
last_button_state = data;
@@ -90,33 +91,31 @@ void PixelStompMux::dump() {
}
void PixelStompMux::probe() {
Serial.println("[MUX] === Hardware Probe ===");
Serial.println("[MUX] === Hardware Probe (BMC Protocol) ===");
for (int round = 0; round < 5; round++) {
Serial.printf("--- Round %d ---\n", round);
digitalWrite(pin_clk, LOW);
digitalWrite(pin_ld, HIGH);
delayMicroseconds(10);
delayMicroseconds(BMC_MUX_74HC165_DELAY);
Serial.printf(" Before latch: DI=%d\n", digitalRead(pin_di));
digitalWrite(pin_ld, LOW);
delayMicroseconds(10);
Serial.printf(" LD=LOW: DI=%d\n", digitalRead(pin_di));
delayMicroseconds(BMC_MUX_74HC165_DELAY);
digitalWrite(pin_ld, HIGH);
delayMicroseconds(10);
Serial.printf(" LD=HIGH: DI=%d\n", digitalRead(pin_di));
delayMicroseconds(BMC_MUX_74HC165_DELAY);
Serial.printf(" After latch: DI=%d\n", digitalRead(pin_di));
for (int i = 0; i < 16; i++) {
digitalWrite(pin_clk, LOW);
delayMicroseconds(5);
bool bit_before = digitalRead(pin_di);
bool bit_val = digitalRead(pin_di);
digitalWrite(pin_clk, HIGH);
delayMicroseconds(5);
bool bit_after = digitalRead(pin_di);
Serial.printf(" CLK %2d: before=%d after=%d\n", i, bit_before, bit_after);
delayMicroseconds(BMC_MUX_74HC165_DELAY);
digitalWrite(pin_clk, LOW);
delayMicroseconds(BMC_MUX_74HC165_DELAY);
Serial.printf(" CLK %2d: DI=%d\n", i, bit_val);
}
delay(500);