I am using the MSP430f5529 launchpad and coding in Energia.
The goal is to make a program that can detect whether the onboard pushbutton is up or down (as part of an eventual Morse code decoder), which I planned to implement using two attachInterrupts.
If I use one, for example attachInterrupt(BUTTON, buttonPress, FALLING), it works fine and the button press is detected. If I use attachInterrupt(BUTTON, buttonRelease, RISING), the button release is detected.
However, if I have bothattachInterrupts in the same program, only one of them works; based on trial and error, it seems whichever interrupt was declared last takes precedence.
In the below code, for example, only buttonPress fires. If I swap the order of my attachInterrupts, only buttonRelease will fire.
#define BUTTON PUSH2
volatile int buttonDown = 987; // set to an arbitrary value so I can tell if the functions changed it at all
void setup() {
Serial.begin(9600);
Serial.println("Test code for buttons");
// Enable internal pullup
pinMode(BUTTON, INPUT_PULLUP);
// attaching release before press
attachInterrupt(BUTTON, buttonRelease, RISING);
attachInterrupt(BUTTON, buttonPress, FALLING);
}
void loop() {
Serial.print("buttonDown: ");
Serial.println(buttonDown);
}
void buttonPress() {
buttonDown = 1;
}
void buttonRelease() {
buttonDown = 0;
}
How can I make both buttonRelease and buttonPress work at the correct times? I tried to just check if the button state changed using a single interrupt (that detected CHANGE, not just RISING or FALLING), but that seemed to lead to even more problems down the road, since the hardware would sometimes register a change in the middle of running the code needed to process what to do with that change.
