You did not help me. A tool is a tool. You will never know all the ways it can be used. Just watch on youtube for the hammer + drilling machine possibilities.
So far the usb serial does not work for the explained situation. It retain the last received char in the circular buffer. To use the same char for next command you have to either clear the whole rx buffer, or at least the place where the char is located. Disabling the usb interrupt during buffer clear might be usefull. On Wed, Aug 6, 2025, 11:33 'Oliver Seitz' via jallib < [email protected]> wrote: > If you go to the tool shop to have a screwdriver replaced because the nail > won't go in, whether you're hammering with the tip or the handle, you won't > succeed. You can use any tool in any way, but if you're using it in a way > it wasn't designed for, and it doesn't work as you expect, you can't call > that an error. If you want to use a ring buffer as a linear buffer, feel > free, but it's better to understand the mechanism rather than trying to > change it. > > Greets, > Kiste > > Am Mittwoch, 6. August 2025 um 09:02:11 MESZ hat vsurducan < > [email protected]> Folgendes geschrieben: > > > Oliver, that is just because else it does not work properly. > How to use the usb serial to send a single ascii command to the picmicro, > in return the microcontroller will send a burst of data and stop. > Sending again the same command, returning another burst of data. > This is not working for me. I can presume there is an interrupt issue > which interfere with my code. > > The serial int_cts does work much better (and faster) by "abusing it".:) > The usb serial unfortunately does not. > As long you have a pointer and a circular buffer, I think is not a > sacrilege trying to work directly with them. > > On Wed, Aug 6, 2025 at 8:30 AM 'Oliver Seitz' via jallib < > [email protected]> wrote: > > Hi Rob, > > we also had discussions about serial_int_cts in the past, it was mainly > due to people abusing the circular receive buffer as linear input buffer. > Instead of using the library's designated functions to read one character > from the circular buffer, they try to read directly from the circular > buffer, which is meant to be internal to the library only. > > This might be a similar issue. > > Greets, > Kiste > > Am Dienstag, 5. August 2025 um 19:11:04 MESZ hat Rob CJ < > [email protected]> Folgendes geschrieben: > > > Hi vsurducan, > > I do not understand the problem. I never had issues with the USB library > that a character is reloaded again from the receive buffer. > > Is it not a problem of the PIC you are using? Have you checked the errata > document? > > Kind regards, > > Rob > > ------------------------------ > *Van:* [email protected] <[email protected]> namens vsurducan > <[email protected]> > *Verzonden:* dinsdag 5 augustus 2025 11:09 > *Aan:* [email protected] <[email protected]> > *Onderwerp:* [jallib] Re: clear CDC buffer > > Ok, here is one solution. If I do no clear the CDC rx buffer, after the > first press of "D" or "d"character the chr value remains the same. > To clear the CDC RX buffer, the pointer must be first decremented, than > the value stored in the buffer cleared. > A new press on "D" or "d" works ok now. > > forever loop > if (chr == "d") | (chr == "D") then > for 8 using i loop > format_word_dec (usb_serial_data, some_data[i], 4, 0) > print_crlf (usb_serial_data) > end loop > print_crlf (usb_serial_data) > ; chr = 0 ; chr "D" or "d" is not cleared with this > cdc_rx_rd = cdc_rx_rd - 1 ; decrement pointer cdc_rx_rd > cdc_rx_buffer[cdc_rx_rd] = 0 ; chr is now 0 > > end if > end loop > > > On Mon, Aug 4, 2025 at 9:24 PM vsurducan <[email protected]> wrote: > > Hi, > I'm trying to clear the last received character through USB communication, > however it seems that last char is reloaded from the receiving buffer. > How can be cleared the last position of the CDC buffer? > > thank you, > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/jallib/CAM%2Bj4qsM9KHOmFegcU0GjWeRxvSggDbVz84pCeddjQbGsbj5Zw%40mail.gmail.com > <https://groups.google.com/d/msgid/jallib/CAM%2Bj4qsM9KHOmFegcU0GjWeRxvSggDbVz84pCeddjQbGsbj5Zw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/jallib/AM7PR02MB6098DEAE25DE7EA9BA4E1CFAE622A%40AM7PR02MB6098.eurprd02.prod.outlook.com > <https://groups.google.com/d/msgid/jallib/AM7PR02MB6098DEAE25DE7EA9BA4E1CFAE622A%40AM7PR02MB6098.eurprd02.prod.outlook.com?utm_medium=email&utm_source=footer> > . > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/jallib/103127088.1309355.1754458194447%40mail.yahoo.com > <https://groups.google.com/d/msgid/jallib/103127088.1309355.1754458194447%40mail.yahoo.com?utm_medium=email&utm_source=footer> > . > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/jallib/CAM%2Bj4qsC45omMCX4Hs5Vc0htZYjNb5M4-LKQkKS9-Xgb5TcBMQ%40mail.gmail.com > <https://groups.google.com/d/msgid/jallib/CAM%2Bj4qsC45omMCX4Hs5Vc0htZYjNb5M4-LKQkKS9-Xgb5TcBMQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/jallib/1218709291.1325692.1754469035911%40mail.yahoo.com > <https://groups.google.com/d/msgid/jallib/1218709291.1325692.1754469035911%40mail.yahoo.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "jallib" group. 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