chandlerbing65nm
Member level 5
I am running a simple blink program in an ATmega2560 with external 8MHz crystal. When I run it in Proteus, the LEDs do not blink. Refer to my files below.
This is the simple blink code. I just add prescaler bits to verify its functionality.
I correctly choose the ATmega2560 with external 8MHz.
And this is my circuit in Proteus: (Removing the VDD in reset, AVCC, AREF doesn't help.)
And I set the fuse bits to work with external crystal:
I don't know where I went wrong. Please help.
Problem already solved. Pinning in Arduino Mega does not follow actual pinning in ATmega2560. I found the pin map here: Arduino Mega - ATMega2560 Pin Mapping
This is the simple blink code. I just add prescaler bits to verify its functionality.
Code:
void setup() {
noInterrupts();
CLKPR = 0x80; /*Enabling the clock prescaler function*/
CLKPR = 0x00; /*Setting the prescaler to div by 1*/
interrupts();
pinMode(13, OUTPUT);
}
void loop() {
digitalWrite(13, HIGH); // turn the LED on (HIGH is the voltage level)
delay(500); // wait for a second
digitalWrite(13, LOW); // turn the LED off by making the voltage LOW
delay(500); // wait for a second
}I correctly choose the ATmega2560 with external 8MHz.
And this is my circuit in Proteus: (Removing the VDD in reset, AVCC, AREF doesn't help.)
And I set the fuse bits to work with external crystal:
I don't know where I went wrong. Please help.
--- Updated ---
Problem already solved. Pinning in Arduino Mega does not follow actual pinning in ATmega2560. I found the pin map here: Arduino Mega - ATMega2560 Pin Mapping
Last edited: