Serin2 data bits
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  1. #1
    Join Date
    Feb 2009
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    Southern California
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    Default Serin2 data bits

    Does anyone know how to change the serin2 bits without using the DEFINE SER2_BITS command?

    Almost 100% of the time I am receiving 8-none, 7 odd, or 7 even, so I use the regular commands and just clear the parity bit. I would like to add the option of selecting at run time either 7-None or 8-odd/Even, and again I would ignore the parity.

    Also, once I'm in 9 bit mode, and I'm receiving data into a byte array, how is the 9th bit handled. I know the HSERIN command has a special register for the 9th bit.

    Thanks, David

  2. #2
    Join Date
    Feb 2009
    Location
    Southern California
    Posts
    85

    Default Re: Serin2 data bits

    Almost 10 years to the day I decide to go to the forum to see if I can find help with this problem and find my old empty thread. Can anyone direct me to a way to change to 7 none, 8 odd or 8 even for serial data. I use Serin2 with 8 databit no parity almost all the time but I would like to give my customers the option to do the less common stuff if they want to change it in the field. The only thought I have so far is use my normal commands unless the option is set and then I can use HSERIN instead, but even then I think that only allows me to add the ability to do 8 data bits with aprity not 7 with none. Anyone else do something similar where they allow the customer to select their baud databits and parity at run time?

  3. #3
    Join Date
    Apr 2014
    Location
    Northeast
    Posts
    289

    Default Re: Serin2 data bits

    Within PBP you can manually manipulate SFRs, read and write to UART registers, etc. If the PIC you are using has EEPROM, you can set up an array of sequential EEPROM addresses with SFR settings. It would default to address 0 of the array. If different settings are desired, a SELECT CASE can find the EEPROM address that matches the settings, then a READ from the EEPROM to the UART SFR would configure appropriately. If you need to add a 9th bit, or something else that won't automatically convert when you reconfigure the UART register, manually loading the TXREG and reading the RXREG will enable full flexibility.

    Here is a piece of code I use to talk with a Nextion display screen using UART on a PIC18F47K42:

    Code:
    for b0 = 0 to 6                         ;Send 7 ASCii Characters via UART
            LOOKUP b0,["n0.val="],b1            ;Rotate through text
            DO
                LOOP UNTIL U1FIFO.5 = 1         ;Wait until TXREG is empty
            U1TXB = b1                          ;Send next character
        next b0
        DO
            LOOP UNTIL U1FIFO.5 = 1             ;Wait until TXREG is empty
        U1TXB = $22                             ;ASCii Double Quotes: "
        ARRAYWRITE HhDcA, [#HhDc]
        IF HhDc < 100 THEN
            HhDcA[2] = HhDcA[1]
            HhDcA[1] = HhDcA[0]
            HhDcA[0] = " "
        ENDIF
        IF HhDc < 10 THEN
            HhDcA[2] = HhDcA[1]
            HhDcA[1] = " "
            HhDcA[0] = " "
        ENDIF
        DO
            LOOP UNTIL U1FIFO.5 = 1             ;Wait until TXREG is empty
        U1TXB = HhDcA[0]
        DO
            LOOP UNTIL U1FIFO.5 = 1             ;Wait until TXREG is empty
        U1TXB = HhDcA[1]
        DO
            LOOP UNTIL U1FIFO.5 = 1             ;Wait until TXREG is empty
        U1TXB = HhDcA[2]
        DO
            LOOP UNTIL U1FIFO.5 = 1             ;Wait until TXREG is empty
        U1TXB = $22                             ;ASCii Double Quotes: "
        for b0 = 1 to 3
            DO
                LOOP UNTIL U1FIFO.5 = 1         ;Wait until TXREG is empty
            U1TXB = $FF                         ;$FF, $FF, $FF; End of Transmission
        next b0

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