programming the atmega

[bassybeats]

Hi, do you have clearer instructions on how program the chip? I don't really understand how you set the RC Oscillator. What did you use to program the chip via the pogo pins?

is there a way to program the chip out of circuit with an arduino or the tl866?

[aignatiev]

I have a custom made, 6-pin ISP connector made with pogo pins (P50-B1). The ones on the edge are the same pins turned the other way around and used as guide pins (they are nicely rounded on the other side).

For programming I used usbasp, but any ISP programmer should be fine. Arduino seems to be capable of doing that.

For calibrating I used the CKOUT fuse to output the main clock frequency to the CLKO pin (PB0) and read that with a frequency counter. It's not as easy to do if you don't have a frequency counter of any kind. The calibration is non linear so you have to set it using trial and error. I had some idea on how to do it without the frequency counter, but I never implemented that.

[adsl95]

Hello,How to set up the fuse?
Can I use an external 12m crystal oscillator without modifying the program?

I don't know English and may have some problems translating, I hope you can understand what I mean.
Thank you and wait for your reply.

[aignatiev]

Hi. Yes, you can add a 12M crystal and configure the fuses appropriately (Low Power Crystal Oscillator, CKSEL = 1111). I think no changes to the code are needed.

[adsl95]

Hello, can all the specific fuse bits be used 0xFF? That is, the high-level and low-expansion bits are all 0xFF, or should there be more specific settings? Because the link in your description uses attiny24's post, the fuse bits are all used 0XFF.
Wait for your reply, thank you.

[adsl95]

Hello, I have other questions I would like to consult.
Because you only provide the source code and don't have a .hex file, if you compile it yourself, do you use keil4 or avr studio?
What is the approximate .hex file size after compilation, for example, atmega8, a single-chip microcontroller with 8k flash space, can you use this program? Or do you need a 16k space like atmega168?
Wait for your reply, thank you.

[aignatiev]

Hi. Fuses are model specific, please read the respective datasheet. This project should not require any fuse changes from the defaults unless you want to use an external crystal. I have used Atmel Studio for compiling this project and the resulting binary should be quite small. I don't have the setup to compile this right now, but it should be less than 2k since it originally fit the attiny24.