Tool/software: Code Composer Studio
Hello,
I am trying to detect a rising edge from an input signal using the Tiva C, I am trying to do this using loops.
I am running into a problem with the variables for the loop, I am trying to keep the input pin on read for loop by anding it with a binary value, however, I am not sure if I am doing this correctly.
These are the variables that I am using:
#define PIND 0x00000010 #define SIGANLIN_PIN GPIO_PIN_4
And here is the loop that I am calling to detect the rising and falling edge:
if (pulsevalue != 0)
{
UARTprintf("Pulses detected\n");
//this will enable the pulses to be read
SafteyCountdown(); //Will blink the LED to show the program will start running
while(1) {
last = 0;
now = PIND & (1<<SIGNALIN_PIN);
if (now != last) {
if (now > 0){
bpm++;//rising edge, do something
GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_3 | GPIO_PIN_0, GPIO_PIN_3); //Need to output to the high pin
}
else
{
//need to output to the low pin
GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_3, GPIO_PIN_0);
}
last = now; //remember state for next pass
} //end of now != last
} //end of while
UARTprintf("Interrupt Conducted\n");
// InterruptEnable();
}
else
{
//This will allow the program to be run the same way if there are no pulses present
UARTprintf("Pulses not detected\n");
SafteyCountdown(); //Will blink the LED to show the program will start running
// InterruptEnable();
while(1) {
now = PIND & (1<<SIGNALIN_PIN);
if (now != last) {
if (now > 0){
bpm++;//rising edge, do something
GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_3 | GPIO_PIN_0, GPIO_PIN_3); //Need to output to the high pin
}
else
{
//Need to output to low pin
GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_3, GPIO_PIN_0);
}
}
last = now; //remember state for next pass
} //end of now != last
} //end of while
UARTprintf("Interrupt Conducted\n");
