/*
  NLSF595 Arduino Shift Register example for Wokwi
  Copyright (C) 2021, Uri Shaked
  
  License: MIT.
*/

//===============================================
/* Usando registrador de deslocamento
//===============================================
const int dataPin = 2;   // SI
const int clockPin = 3;  // SCK
const int latchPin = 4;  // RCK

void setup() {
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
}

void sendData(uint8_t pattern) {
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, LSBFIRST, pattern); //MSBFIRST ou LSBFIRST
  digitalWrite(latchPin, HIGH);
}

void loop() {
  // Red
  sendData(0b11011011); //Envia o LSB primeiro
  delay(500);

  // Green
  sendData(0b10110111);
  delay(500);

  // Purple
  sendData(0b01001011);
  delay(500);
}
//===============================================
// Fim - Usando registrador de deslocamento
//=============================================*/

//===============================================
//* Usando hardware SPI
//===============================================

#include <SPI.h>
//https://docs.arduino.cc/learn/communication/spi

//CS    - pino 10 - RCL (register clock)
//MOSI  - pino 11 - SI (serial input)
//MISO  - pino 12
//CLK   - pino 13 - SCL (shift clock)

//Mode	    Clock Polarity (CPOL)	Clock Phase (CPHA)	Output Edge	Data Capture
//SPI_MODE0	0	                    0	                  Falling	    Rising
//SPI_MODE1	0	                    1	                  Rising	    Falling
//SPI_MODE2	1	                    0	                  Rising	    Falling
//SPI_MODE3	1	                    1	                  Falling	    Rising

//Is data shifted in:
//MSBFIRST Most Significant Bit (MSB) first
//LSBFIRST Least Significant Bit (LSB) first


const int slaveSelectPin = 10;

void setup() {
  pinMode(slaveSelectPin, OUTPUT);
  //Inicializa a SPI
  //Modo básico padrão
  SPI.begin();
  //Modo comppleto - SPISettings mySetting(speedMaximum, dataOrder, dataMode)
  //SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE0));
  //SPI.beginTransaction(SPISettings(1000000, LSBFIRST, SPI_MODE0));  //Não auterou o código
  //Neste modo, por razões desconhecidas o clock voltava para nível alto alguns microssegundos após encerrar o dado
}

void sendData(uint8_t dado) {
  // take the SS pin low to select the chip:
  digitalWrite(slaveSelectPin, LOW);  //Está no Latch Clock
  delayMicroseconds(20);
  //  send in the address and value via SPI:
  SPI.transfer(dado);
  delayMicroseconds(20);
  // take the SS pin high to de-select the chip:
  digitalWrite(slaveSelectPin, HIGH);
}

void loop() {
  // Red
  //sendData(0b11011011);
  sendData(0b11011011);   //DBh Envia MSB primeiro
  delay(500);             //Comentar para análise-lógica no pulse
  delayMicroseconds(20);

  // Green
  //sendData(0b10110111);
  sendData(0b11101101);   //EDh
  delay(500);             //Comentar para análise-lógica no pulse
  delayMicroseconds(20);

  // Purple
  //sendData(0b01001011);
  sendData(0b11110110);   //F6h
  delay(500);             //Comentar para análise-lógica no pulse
  delayMicroseconds(20);
}

//===============================================
// Fim - Usando hardware SPI
//=============================================*/