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I am now urgant.
Thank you. But I must need ready and tested routines for slow frequence (31kHz, 125kHz, 250kHz etc.).
Please for me.
Yes, you are urgant (sic!). But why are you urgant? Or actually arrogant! Have you not spent the last days with Google, or using the search function on this forum, or downloading example code from the chip manufacturer? Reading the chip datasheets and application notes?
Well then, exactly what have you done?
A private tutor charges money. A private contractor - consultant - charges money. Why do you think people on this forum should start jumping because you have a need? That is both rude and silly. Prove that you are not a leach: Start showing some work! People will not donate time on you, unless you show that it is worth it.
And why do you make a post that doesn't even mention the processor? Do you really think it is enough to say that you have a station wagon when you buy spare parts for a car? No need for exact make and model (and in that case also fabrication year, or serial number)?