AD75019 Crosspoint Switch Library for Arduino

This library is intended to simplfy use of the Analog Devices AD75019 analog crosspoint switch. For more information about this chip, see the AD75019 datasheet.

Written by Dan Mowehhuk (danmowehhuk@gmail.com)
BSD license, check license.txt for more information
All text above must be included in any redistribution

Installation

To install, use the Arduino IDE Library Manager. Just search for AD75019!

Quick Start

Simply instantiate the AD75019 class with the Arduino pin numbers for PCLK, SCLK and SIN. The chip works just like a 256-bit shift register, where bits are clocked in serially, then applied by setting the PCLK pin HIGH then back to LOW.

#include <AD75019.h>

// Connect PCLK, SCLK and SIN to pins 5, 6 and 7
AD75019 xptSwitch(5, 6, 7);

void setup() {
  Serial.begin(9600);
  while (!Serial);

  // Initialize the AD75019
  if (!xptSwitch.begin()) {
    Serial.println("AD75019 initialization failed")
    while(1);
  }

  // Configure routes
  xptSwitch.addRoute(0, 3); // X0 to Y3
  xptSwitch.addRoute(3, 4); // X3 to Y4
  // all other crosspoints left unconnected

  // Send the route configuration to the AD75019
  xptSwitch.flush();
}

Using Callbacks

If you are using a port expander such as the MCP23017, you will need to provide callback functions to the AD75019 class telling it how to perform a pinMode and digitalWrite.

See the callback example example for more details.

Pin Remapping

PCB layout considerations may require X and Y pins to be used non-sequentially, while your code would prefer sequential numbers. You can provide xMapping and yMapping arrays to let the library take care of this remapping for you.

NOTE: The remapping arrays must be 16 elements in size, with values between 0-15, and without repeats. If a remapping array is invalid, the begin(xMapping, yMapping) method will return false and calling flush() will be disabled.

See the remapping example example for more details.