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Raspberry pi usb output from GPIO

Former Member

I've had this idea and I've googled a lot to find out if it would be possible to attatch usb cable to raspberry pi's GPIO pins. I already got an old usb cable and cutted the other end off and i tought that I just attatch the vireing to GPIOs and plug other end, whitch have still the USB A port on it, to computer and I would be able to control all data.  I mainly am trying to program it to act as HID device.... Is there any python lybrary or can i just somehow output the raw data in bytes? How would i be able to do it?image

Parents

  • Back in the day of Serial Ports and Parallel Ports on PC's you could connect the TX and RX(Serial) or the D0 (Parallel) lines to GPIO pins via a voltage shifter such as MAX232 and by sending out bytes at a low baud rate, read the Bits in as the pins went high and low, known as Bit Banging.

     

    USB is different as you cannot just simply connect the data lines and do the same. Firstly is the data being sent is probably too fast to monitor the pins and it actually does a lot of other stuff such as handshaking before it even gets to this point.

     

    If you really wanted to send data out of a USB port and read it in by monitoring the GPIO ports then you can setup your own Bit Bang Routines with FTDI modules based on the FT232 chip for serial and FT245 for parallel Data.

     

    Probably easier just to use the onboard Raspberry Pi UART and connect the FT232 module to read in the serial data, as would be much quicker than doing your own Bit Bang routines.

     

    Or just use the USB port on the Raspberry Pi to receive 64byte packets at a even faster speed.

Reply

  • Back in the day of Serial Ports and Parallel Ports on PC's you could connect the TX and RX(Serial) or the D0 (Parallel) lines to GPIO pins via a voltage shifter such as MAX232 and by sending out bytes at a low baud rate, read the Bits in as the pins went high and low, known as Bit Banging.

     

    USB is different as you cannot just simply connect the data lines and do the same. Firstly is the data being sent is probably too fast to monitor the pins and it actually does a lot of other stuff such as handshaking before it even gets to this point.

     

    If you really wanted to send data out of a USB port and read it in by monitoring the GPIO ports then you can setup your own Bit Bang Routines with FTDI modules based on the FT232 chip for serial and FT245 for parallel Data.

     

    Probably easier just to use the onboard Raspberry Pi UART and connect the FT232 module to read in the serial data, as would be much quicker than doing your own Bit Bang routines.

     

    Or just use the USB port on the Raspberry Pi to receive 64byte packets at a even faster speed.

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