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pouriap / TinyRF

A small Arduino library for using 315MHz / 433MHz RF modules with ATtiny13 and other low-memory microcontrollers.
GNU General Public License v3.0
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Usage on Attiny85 #6

Closed yannik0707 closed 2 years ago

yannik0707 commented 2 years ago

Hi, have you ever tried using the Attiny85 as a reciever? I'm trying to, but cant get it working. I already attached a 16 MHz crystal and tried different pin configurations and used the same code on a Atmega328p and it works. Is there anything left I can try to get it working?

pouriap commented 2 years ago

I have not unfortunately.

Do you get any errors?

What does your Settings.h file look like? Have you changed it?

yannik0707 commented 2 years ago

Since its hard to debug the Attiny85, I don't get anything that could be usefull, but I used some LEDs to "display" the return of getReceivedData(), so its blinks, if an error accured. But it dont blinks, so I dont think there is anything coming in. My `Settings.h´ is stock and I'm just sending some chars. The Tiny is runnin, I'm adjusting a PWM Output with the transmitted data and the output works fine, but is not adjusting. I can also see the reciever is working, because there are bits coming in on the DATA pin when I'm transmitting data (looked close with a scope). Is there any possibility that some INT-Pins are not supported or anything?

pouriap commented 2 years ago

You can only use PB2 because it has to be an external interrupt pin.

Try reducing your buffer size in Settings.h and see if that helps. Change #define TRF_RX_BUFFER_SIZE 128 to something smaller like 16

The buffer size depends on how many bytes each message contains, how many times you send each message, and how quickly you call getReceivedData() in your code. For example if you want to send a 2 byte message 4 times (using sendMulti()), the buffer size should be at least (2+3)*4 = 20 bytes. (Those 3 extra bytes are message length, crc and sequence number added by the software).

yannik0707 commented 2 years ago

Thanks, I will try it and tell you

pouriap commented 2 years ago

So I bought an ATtiny85 today! And can confirm that TinyRF does actually work on it as receiver. But you have to reduce the buffer size like I suggested. It doesn't work with the 128 byte buffer.

Other than the buffer size you have to be careful in your code to reduce your RAM usage as much as possible. That fat 30 byte buffer for instance in the receiver example is a no-no if you are using an ATtiny as receiver.

I'll update the examples and the code to add support and documentation for tiny85.

yannik0707 commented 2 years ago

Yeah it finally works, thank you very much