/*
  Wokwi Custom SPI Chip example

  The chip implements a simple ROT13 letter substitution cipher:
  https://en.wikipedia.org/wiki/ROT13

  See https://docs.wokwi.com/chips-api/getting-started for more info about custom chips
*/

#include <SPI.h>

#define CS 10
#define LATCH 9

void setup() {
  char buffer[] = "Uryyb, FCV! ";

  Serial.begin(115200);
  pinMode(CS, OUTPUT);
  pinMode(LATCH, OUTPUT);

  // SPI Transaction: sends the contents of buffer, and overwrites it with the received data.

  SPI.begin();
  int16_t speed = 1000;
  byte lowByteA = speed & 0xff;
  byte highByteA = ((speed >> 8) & 0xff) | 0 << 7 | 1 << 4;

  SPI.beginTransaction(SPISettings(20000000, MSBFIRST, SPI_MODE0));
  digitalWrite(LATCH, 1); digitalWrite(CS, 0);
  SPI.transfer(highByteA); SPI.transfer(lowByteA);
  digitalWrite(CS, 1); digitalWrite(LATCH, 0);
  SPI.endTransaction();
  lowByteA = speed & 0xff;
  highByteA = ((speed >> 8) & 0xff) | 1 << 7 | 1 << 4;

  SPI.beginTransaction(SPISettings(20000000, MSBFIRST, SPI_MODE0));
  digitalWrite(LATCH, 1); digitalWrite(CS, 0);
  SPI.transfer(highByteA); SPI.transfer(lowByteA);
  digitalWrite(CS, 1); digitalWrite(LATCH, 0);
  SPI.endTransaction();
  
  
  SPI.end();

}

void loop() {
}