settings() / Libraries / Processing.org

Name

settings()

Class

SPI

Description

Configures the SPI interface

The default setting is: 500000, SPI.MSBFIRST, SPI.MODE0

Examples

import processing.io.*;
SPI adc;

void setup() {
  //printArray(SPI.list());
  adc = new SPI(SPI.list()[0]);
  adc.settings(500000, SPI.MSBFIRST, SPI.MODE0);
}

void draw() {
  // read in values over SPI from an analog-to-digital
  // converter
  // dummy write, actual values don't matter
  byte[] out = { 0, 0 };
  byte[] in = adc.transfer(out);
  // some input bit shifting according to the datasheet
  int val = ((in[0] & 0x1f) << 5) | ((in[1] & 0xf8) >> 3);
  // val is between 0 and 1023
  println(val);
}

Syntax

.settings(maxSpeed, dataOrder, mode)

Parameters

maxSpeed(int)maximum transmission rate in Hz, 500000 (500 kHz) is a resonable default
dataOrder(int)whether data is send with the first- or least-significant bit first (SPI.MSBFIRST or SPI.LSBFIRST, the former is more common)
mode(int)<a href="https://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus#Clock_polarity_and_phase">,SPI.MODE0 to SPI.MODE3,</a>

Return

void

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