-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
2 changed files
with
168 additions
and
3 deletions.
There are no files selected for viewing
165 changes: 165 additions & 0 deletions
165
Firmware/Example2_InterruptRead_Output_LEDs/Example2_InterruptRead_Output_LEDs.ino
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| /* | ||
| Using the PCA9554 with Interrupts | ||
| Modified by: Ho Yun "Bobby" Chan | ||
| Orignally Written By: Nathan Seidle | ||
| SparkFun Electronics | ||
| Date: November 22nd, 2024 | ||
| License: This code is public domain but you buy me a beer if you use this and we meet someday (Beerware license). | ||
| Feel like supporting our work? Buy a board from SparkFun! | ||
| https://www.sparkfun.com/products/17047 - Qwiic GPIO | ||
| https://www.sparkfun.com/products/26784 - Qwiic Power Switch | ||
| https://www.sparkfun.com/products/26851 - Qwiic Directional Pad | ||
| This example demonstrates how to use interrupts to check for new pin changes on the Qwiic Directional Pad | ||
| and turn on/off the RGB LED channels | ||
| Hardware Connections: | ||
| Plug the Qwiic Directional Pad into a Qwiic enabled board (SparkFun Thing Plus C, RedBoard, RedBoard IoT, etc) | ||
| If you don't have a platform with a Qwiic connection use the SparkFun Qwiic Breadboard Jumper (https://www.sparkfun.com/products/17912) | ||
| Connect a wire from a GPIO pin that is interrupt capable to the !INT pin on the Qwiic Directional Pad | ||
| Open the serial monitor at 115200 baud to see the output. | ||
| */ | ||
|
|
||
| #include <SparkFun_I2C_Expander_Arduino_Library.h> // Click here to get the library: http://librarymanager/All#SparkFun_I2C_Expander_Arduino_Library | ||
|
|
||
| //SFE_PCA95XX io(PCA95XX_PCA9534); // Create a PCA9534 - Has interrupt pin | ||
| //SFE_PCA95XX io(PCA95XX_PCA9536); // Create a PCA9536 - Has optional interrupt pin | ||
| //SFE_PCA95XX io(PCA95XX_PCA9537); // Create a PCA9537 - Has interrupt pin | ||
| SFE_PCA95XX io(PCA95XX_PCA9554); // Create a PCA9554 - Has interrupt pin | ||
| //SFE_PCA95XX io(PCA95XX_PCA9556); // Create a PCA9556 - No interrupt pin / Not compatible with this code | ||
| //SFE_PCA95XX io(PCA95XX_PCA9557); // Create a PCA9557 - No interrupt pin / Not compatible with this code | ||
|
|
||
| int buttonUp = 0; | ||
| int buttonDown = 1; | ||
| int buttonRight = 2; | ||
| int buttonLeft = 3; | ||
| int buttonCenter = 4; | ||
| int ledBlue = 5; | ||
| int ledGreen = 6; | ||
| int ledRed = 7; | ||
|
|
||
| int gpioExpander_interrupt = 4; //INT of PCA9554 is connected to ESP pin 4. Goes low when an input pin changes. | ||
|
|
||
| bool buttonPressed = false; | ||
|
|
||
| //Interrupt that is called when INT pin goes low | ||
| void IRAM_ATTR gpioExpanderISR() { | ||
| buttonPressed = true; | ||
| } | ||
|
|
||
| void setup() { | ||
| Serial.begin(115200); | ||
| delay(250); | ||
| Serial.println("Qwiic Directional Pad Example"); | ||
|
|
||
| Wire.begin(); | ||
|
|
||
| // Initialize the PCA95xx with its default I2C address | ||
| if (io.begin() == false) { | ||
| Serial.println("PCA9554 not detected. Please check wiring. Freezing..."); | ||
| while (1) | ||
| ; | ||
| } | ||
| pinMode(gpioExpander_interrupt, INPUT_PULLUP); | ||
|
|
||
| io.pinMode(buttonUp, INPUT); | ||
| io.pinMode(buttonDown, INPUT); | ||
| io.pinMode(buttonLeft, INPUT); | ||
| io.pinMode(buttonRight, INPUT); | ||
| io.pinMode(buttonCenter, INPUT); | ||
| io.pinMode(ledRed, OUTPUT); | ||
| io.pinMode(ledGreen, OUTPUT); | ||
| io.pinMode(ledBlue, OUTPUT); | ||
|
|
||
| //By default, on the PA9557, IO 4567 are inverted | ||
| /*io.revert(buttonCenter); //Set to not inverted | ||
| io.revert(ledRed); //Set to not inverted | ||
| io.revert(ledGreen); //Set to not inverted | ||
| io.revert(ledBlue); //Set to not inverted*/ | ||
|
|
||
| redOff(); | ||
| greenOff(); | ||
| blueOff(); | ||
|
|
||
| Serial.println("Qwiic Directional Pad online!"); | ||
|
|
||
| attachInterrupt(gpioExpander_interrupt, gpioExpanderISR, CHANGE); | ||
| } | ||
|
|
||
| void loop() { | ||
| //Wait for interrupt to fire | ||
| if (buttonPressed == true) { | ||
| Serial.println("Interrupt! "); | ||
| //Get all the pins in one read to save time | ||
| uint8_t currentState = io.getInputRegister(); | ||
| // Pins are pulled high so when we see low, button is being pressed | ||
| if ((currentState & (1 << buttonUp)) == 0) { | ||
| Serial.println("Up"); | ||
|
|
||
| //RED | ||
| redOn(); | ||
| greenOff(); | ||
| blueOff(); | ||
| } else if ((currentState & (1 << buttonDown)) == 0) { | ||
| Serial.println("Down"); | ||
|
|
||
| //GREEN | ||
| redOff(); | ||
| greenOn(); | ||
| blueOff(); | ||
| } else if ((currentState & (1 << buttonLeft)) == 0) { | ||
| Serial.println("Left"); | ||
|
|
||
| //MAGENTA | ||
| redOn(); | ||
| greenOff(); | ||
| blueOn(); | ||
| } else if ((currentState & (1 << buttonRight)) == 0) { | ||
| Serial.println("Right"); | ||
|
|
||
| //CYAN | ||
| redOff(); | ||
| greenOn(); | ||
| blueOn(); | ||
| } else if ((currentState & (1 << buttonCenter)) == 0) { | ||
| Serial.println("Center"); | ||
|
|
||
| //WHITE | ||
| redOn(); | ||
| greenOn(); | ||
| blueOn(); | ||
| } else { | ||
| Serial.println(" None"); | ||
|
|
||
| //OFF | ||
| redOff(); | ||
| greenOff(); | ||
| blueOff(); | ||
| } | ||
|
|
||
| buttonPressed = false; | ||
| } | ||
| } | ||
|
|
||
|
|
||
|
|
||
| void redOn() { | ||
| io.digitalWrite(ledRed, LOW); | ||
| } | ||
| void redOff() { | ||
| io.digitalWrite(ledRed, HIGH); | ||
| } | ||
| void greenOn() { | ||
| io.digitalWrite(ledGreen, LOW); | ||
| } | ||
| void greenOff() { | ||
| io.digitalWrite(ledGreen, HIGH); | ||
| } | ||
| void blueOn() { | ||
| io.digitalWrite(ledBlue, LOW); | ||
| } | ||
| void blueOff() { | ||
| io.digitalWrite(ledBlue, HIGH); | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters