Error en registro TIFR del attiny2313. rev 2278

#1 · April 16, 2024, 4:43 pm

¿El registro TIFR debería de estar inicialmente en ceros?

Cuando subo el programa al attiny2313, el osiloscopio no produce una señal PWM. Tampoco el led alterna de encendido a apagado.

Pero al subir este mismo programa "físicamente" al attiny2313APU el led sí alterna de encendido a apagado.

Yo utilizo linux y avrdude 6.3

#2 · April 16, 2024, 4:56 pm

Hi, thanks for reporting.
Can you share your code and circuit?

And please use english in this forum.

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#3 · April 16, 2024, 8:59 pm

I copied the sketch from this page: https://startingelectronics.com/tutorials/AVR-8-microcontrollers/ATtiny2313-tutorial/P8-TC0-polled-timer/

#include <avr/io.h>

int main(void)
{
    char toggle = 0;

    DDRD |= (1 << PD6); // LED on PD6
    
    TCCR0A = 0x02;      // Clear Timer on Compare Match (CTC) mode
    OCR0A  = 0xFF;      // number to count up to
    TCCR0B = 0x05;      // clock source CLK/1024, start timer

    while(1)
    {
        if (TIFR & 0x01) {      // timer timed out?
            TIFR |= 0x01;       // reset timer flag
            // toggle LED each time the timer times out
            if (toggle) {
                toggle = 0;
                PORTD &= ~(1 << PD6);
            }
            else {
                toggle = 1;
                PORTD |=  (1 << PD6);
            }
        }
    }
}

#4 · April 16, 2024, 9:01 pm

#makefile attiny2313

AVR         = attiny2313
COMPILE    = avr-gcc -Wall -O3 -mmcu=$(AVR)

SOURCES     = main.c 
OUTPUT_HEX  = main.hex
OBJETCS     = $(patsubst %.c, %.o, $(SOURCES))
OUTPUT_ELF  = $(patsubst %.hex, %.elf, $(OUTPUT_HEX))

all: $(OUTPUT_HEX)

%.o: %.c
	$(COMPILE) -c $<

$(OUTPUT_HEX): $(OBJETCS)
	$(COMPILE) $^ -o $(OUTPUT_ELF)
	avr-objcopy -O ihex $(OUTPUT_ELF) $@

clean:
	rm -f *.o *.elf *.hex

#5 · April 16, 2024, 9:29 pm

When I load the program C into the attiny2313APU. LED toggle.

I don't have an osiloscope. But doing the math with an OC0RA of 255 the result is 1.92 Hz

#6 · April 16, 2024, 10:53 pm

Thanks for all the information.

Seems that this issue is alredy solved in development version.
This fix will be included in next "tester builds" for 1.1.0.
Have a look here for an update in next days:
https://simulide.com/p/testers/

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