I was wondering how I could send a byte array of 16 or more bytes from the pi to a computer, where the computer would receive it via USB. Could UART send a byte array of this length? If yes, how can I arrange them? I have sent them over via wifi, using sockets on python, now I need to send them over USB, as it is faster and more reliable. Thanks! NB: I am using Raspberry Pi3, model B.
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Does it have to be pure USB, or an USB/Serial adapter would work too? Because this is the easiest way.– RaduJan 22, 2018 at 16:58
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USB on the PC end is a must, I am allowed to be flexible on the other side.– rpi350Jan 22, 2018 at 17:01
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It's a must to use the USB stack on the PC, or what?– RaduJan 22, 2018 at 17:06
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I have to use a USB cable on the PC side.– rpi350Jan 22, 2018 at 17:23
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So then do what I said, get an USB/serial adapter. They are pretty cheap.– RaduJan 22, 2018 at 19:11
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1 Answer
Yes you can.
Use a USB serial dongle. One end will be USB to plug into a USB port. The other end should be pins to connect with wires to the Pi's TXD, RXD, and ground pins. Make sure the dongle works with 3V3 TTL (i.e. can talk to the Pi GPIO).
The device will be seen as a serial device at the PC and Pi ends.
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Thanks, but how exactly do I arrange a 16 byte array in UART? As far as I understand, UART only sends 8 bits of information.– rpi350Jan 22, 2018 at 18:08
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Linux uses a function called write (man 2 write) to send data to a device. You specify the number of bytes to write.– joanJan 22, 2018 at 18:12