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I am having trouble knowing how to code this for the Sparkfun SX1509 multiplexer board. I have successfully changed I2C ports for OLED displays by changing &Wire to &Wire2 for example, but doing this doesn't work for the SX1509.
In the Sparkfun code, see below, they use io.begin(SX1509_ADDRESS) to initialise the board with the default being wire (SDA 19 and SCL 18) on the Teensy 4.1.
I would like to use SDA1 and SCL1 instead.
According to their GitHub io.begin() can have the following parameters which to me looks like I can choose a different I2C port. I am not sure how to implement this in code. Any help would be appreciated.
Here is some code from their website that I have been using to test this:
In the Sparkfun code, see below, they use io.begin(SX1509_ADDRESS) to initialise the board with the default being wire (SDA 19 and SCL 18) on the Teensy 4.1.
I would like to use SDA1 and SCL1 instead.
According to their GitHub io.begin() can have the following parameters which to me looks like I can choose a different I2C port. I am not sure how to implement this in code. Any help would be appreciated.
Code:
uint8_t SX1509::begin(uint8_t address, TwoWire &wirePort, uint8_t resetPin)45 {
46 // Store the received parameters into member variables
47 _i2cPort = &wirePort;
48 deviceAddress = address;
49 pinReset = resetPin;Here is some code from their website that I have been using to test this:
Code:
/************************************************************* analogWrite.ino
SparkFun SX1509 I/O Expander Example: pwm output (analogWrite)
Jim Lindblom @ SparkFun Electronics
Original Creation Date: September 21, 2015
https://github.com/sparkfun/SparkFun_SX1509_Arduino_Library
This example demonstrates the SX1509's analogWrite function.
Connect an LED to the SX1509's pin 15 (or any other pin, they
can all PWM!). The SX1509 can either sink or source current,
just don't forget your limiting resistor!
Hardware Hookup:
SX1509 Breakout ------ Arduino -------- Breadboard
GND -------------- GND
3V3 -------------- 3.3V
SDA ------------ SDA (A4)
SCL ------------ SCL (A5)
15 -------------------------------- LED+
LED- -/\/\/\- GND
330
Development environment specifics:
IDE: Arduino 1.6.5
Hardware Platform: Arduino Uno
SX1509 Breakout Version: v2.0
This code is beerware; if you see me (or any other SparkFun
employee) at the local, and you've found our code helpful,
please buy us a round!
Distributed as-is; no warranty is given.
*************************************************************/
#include <Wire.h> // Include the I2C library (required)
#include <SparkFunSX1509.h> //Click here for the library: http://librarymanager/All#SparkFun_SX1509
// SX1509 I2C address (set by ADDR1 and ADDR0 (00 by default):
const byte SX1509_ADDRESS = 0x3E; // SX1509 I2C address
SX1509 io; // Create an SX1509 object to be used throughout
// SX1509 Pin definition:
const byte SX1509_LED_PIN = 15; // LED to SX1509's pin 15
void setup()
{
Serial.begin(115200);
Serial.println("SX1509 Example");
Wire.begin();
// Call io.begin(<address>) to initialize the SX1509. If it
// successfully communicates, it'll return 1.
if (io.begin(SX1509_ADDRESS) == false)
{
Serial.println("Failed to communicate. Check wiring and address of SX1509.");
while (1)
; // If we fail to communicate, loop forever.
}
// Use the pinMode(<pin>, <mode>) function to set our led
// pin as an ANALOG_OUTPUT, which is required for PWM output
io.pinMode(SX1509_LED_PIN, ANALOG_OUTPUT);
}
void loop()
{
// Ramp brightness up, from 0-255, delay 2ms in between
// analogWrite's
for (int brightness = 0; brightness < 256; brightness++)
{
// Call io.analogWrite(<pin>, <0-255>) to configure the
// PWM duty cycle
io.analogWrite(SX1509_LED_PIN, brightness);
delay(2); // Delay 2 milliseconds
}
delay(500); // Delay half-a-second
// Ramp brightness down, from 255-0, delay 2ms in between
// analogWrite's
for (int brightness = 255; brightness >= 0; brightness--)
{
io.analogWrite(SX1509_LED_PIN, brightness);
delay(2); // Delay 2 milliseconds
}
delay(500); // Delay half-a-second
}