Has anyone tried using the touchscreen IRQ to trigger an action on an esp32? I've been unsuccessful despite much effort. I would greatly appreciate another set of eyes over all of this. I'm assuming something obvious is missing, but can't figure it out.
Here's what I have:
-esp32 Devkit
-STMPE610 on a 7789 TFT
-1Mohm Pullup resistor on the IRQ circuit
I have only been able to get a constant repeating IRQ trigger with 1Mohm Pullup attached and the following code: ANY changes results in no IRQ triggering. Have exhaustively tried many combinations of settings for the STMPE610
#include "Adafruit_STMPE610.h" //https://github.com/adafruit/Adafruit_STMPE610
#include <Arduino.h>
unsigned long pTime1 = millis(); //For delays
unsigned long pTime2 = millis();
#define TSINT 26 //esp32 GPIO26 - TS IRQ Input from STMPE610
volatile int IRQTrigger = 0; //Flag for IRQ occurance
Adafruit_STMPE610 touch = Adafruit_STMPE610();
portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED;
void IRAM_ATTR TSisr() {
detachInterrupt(TSINT);
portENTER_CRITICAL_ISR(&mux);
IRQTrigger = 1; //IRQ Flag
portEXIT_CRITICAL_ISR(&mux);
// attachInterrupt(TSINT, TSisr, FALLING); //Reattach here or later?
}
void setup() {
Serial.begin(115200);
touch.begin(0x41);
pinMode(TSINT, INPUT_PULLUP); //ALSO tried 1M Ohm to 3V3
Serial.println("Starting");
touch.writeRegister8(STMPE_INT_STA, 0xFF); // reset all ints
//Following are for TESTING
// touch.writeRegister8(STMPE_INT_CTRL, STMPE_INT_CTRL_POL_LOW); //Set Low on INT
// touch.writeRegister8(STMPE_INT_CTRL, STMPE_INT_CTRL_POL_HIGH); //Set High on INT
// touch.writeRegister8(STMPE_INT_CTRL, STMPE_INT_CTRL_EDGE); //SET INT output to Edge
// touch.writeRegister8(STMPE_INT_CTRL, STMPE_INT_CTRL_LEVEL); //SET INT output to Level
// touch.writeRegister8(STMPE_INT_CTRL, STMPE_INT_EN);
attachInterrupt(TSINT, TSisr, FALLING);
}
void loop() {
unsigned long cTime = millis();
uint16_t x, y;
uint8_t z;
if (touch.touched()) {
// read x & y & z;
while (!touch.bufferEmpty()) {
Serial.print(touch.bufferSize());
touch.readData(&x, &y, &z);
Serial.print("->(");
Serial.print(x); Serial.print(", ");
Serial.print(y); Serial.print(", ");
Serial.print(z);
Serial.print(") ");
Serial.println(analogRead(TSINT));
touch.writeRegister8(STMPE_INT_STA, 0xFF);
}
touch.writeRegister8(STMPE_INT_STA, 0xFF);
}
if (IRQTrigger == 1) { //Action when IRQ triggered
Serial.println(" IRQ Triggered");
IRQTrigger = 0;
touch.writeRegister8(STMPE_INT_STA, 0xFF);
attachInterrupt(TSINT, TSisr, FALLING); //re-attach IRQ
}
if (cTime - pTime2 >= 300) {
Serial.println(analogRead(TSINT));
pTime2 = cTime;
}
}
