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Corrige erro de cor e brilho da matriz de LEDs RGB aplicando a reversão de byte #25

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Corrige erro de cor e brilho da matriz de LEDs RGB aplicando a reversão de byte #25

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29 changes: 26 additions & 3 deletions neopixel_pio/neopixel_pio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,25 @@ npLED_t leds[LED_COUNT];
PIO np_pio;
uint sm;

/**
* Reverte a ordem de um byte LSB -> MSB e sucessivamente.
* @param b o byte a ser revertido
*/
uint8_t reverse_byte(uint8_t b) {
uint8_t reversed = 0; // Inicializa o byte a ser revertido

// Faz a reversão bit a bit seguindo a lógica:
// 1. Captura o i-ésimo bit do byte original ((b >> i) & 0x1)
// 2. Envia-o para a variável reversed com o operador |
// 3. Arrasta o bit transferido para a esquerda (reversed << 1)
for (uint8_t i = 0; i < 8; i++) {
reversed = reversed << 1; //
reversed = (reversed | ((b >> i) & 0x1));
}

return reversed;
}

/**
* Inicializa a máquina PIO para controle da matriz de LEDs.
*/
Expand Down Expand Up @@ -55,9 +74,13 @@ void npInit(uint pin) {
* Atribui uma cor RGB a um LED.
*/
void npSetLED(const uint index, const uint8_t r, const uint8_t g, const uint8_t b) {
leds[index].R = r;
leds[index].G = g;
leds[index].B = b;
uint8_t reversed_r = reverse_byte(r);
uint8_t reversed_g = reverse_byte(g);
uint8_t reversed_b = reverse_byte(b);

leds[index].R = reversed_r;
leds[index].G = reversed_g;
leds[index].B = reversed_b;
}

/**
Expand Down