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Raspberry pi zero

patil.sunny9999

Hello There,

Please help me out. I am using Raspbeery Pi zero and Raspberry pi Zero W. Currently I am working on Serial Transmission on it. First the Serial Transmission was working well on raspberry pi zero. but all of a sudden it stops receiving data.so i checked the TTL voltage level , on RX pin it showing only 0.35 volts. As i checked more i got to know that my RX pin and Ground are shorted. What should i do now ? please suggest.

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  • in reply to patil.sunny9999

    The GPIO pins are "general purpose".... you can do anything with them. But you have to write software to do that. And  often what you want to do is easy to do in hardware and many people use it, so they make a hardware module that can do it.


    This is the case for the serial port. The protocol (start out with the line high, then pulse it low for one period, then pulse each of the bits and then go high again for at least one bit period) is common and easy enough to warrant hardware. Now they COULD make the chip so that you can route all pins to each of the hardware modules. (besides "serial" there is SPI and I2C for example). But that's expensive in terms of chip space. And in most cases not necessary.

     

    So as an example the chip maker may tell you: If you want serial that can be on pins 1 and 2 or 4 and 5. SPI can be on 4-5-6, or on 7-8-9. If now I2C can go on 1-2 or 7-8, you'd have the situation that you can chose any two of these modules but not all three. Of course in practice, things are more complex, with more options and more peripherals things get more complex. But also you get the situation that almost always you can find a solution provided you don't need ALL peripherals at the same time.

    Anway..... I looked up the options for your RX signal. It is normally on pin GPIO15. pin 10 of the P1 connector. But you can also configure it on pin GPIO33, GPIO37 or GPIO41. None of these are broken out on the P1 connector. :-(