RXINT and 18F4331

[Frank123]

Hello
I recently use Flowcode V4 and therefore I get .fcf Flowcode of V3.
Unable to run RXINT. I do a lot of change in the .fcd but the only one that works is to resume my old version (find on this forum) :

Code: Select all

[USART_RX]
Name="Réception USART"
UseExplicitHandlerCode=1
FlagReg=
FlagBit=
HandlerCode="if (pir1 & (1 << RCIF))\n{\n  FCM_%n(); // call selected macro\n}\n"
UseExplicitEnableCode=1
EnReg=
EnBit=
EnableCode="intcon.PEIE = 1; // Enable peripheral interrupts\nintcon.GIE = 1;  // Enable global interrupts\npie1.RCIE = 1;   // Enable USART receive interrupts\nrcsta.CREN=1;    // Enable reception\n"
DisableCode="pie1.RCIE = 0; // Disable USART receive interrupts\n" 
OptCnt=0
TmrOpt=0

[Steve]

Please post your current V4 FCD file and the old V3 FCD file (with your modifications) and we'll try to create a new V4 one for you.

[Frank123]

V3 FCD File

18F4331.fcd

PIC18F4331 V3

(12.46 KiB) Downloaded 316 times

V4 FCD File

18F4331.fcd

PIC18F4331 V4

(8.48 KiB) Downloaded 337 times

Only USART_RX (add by me) is ok on this.

[Steve]

You might want to try the st_bit() and cr_bit() functions instead of using the "dot" notation.

Do you get specific error messages when compiling, or is the program compiling ok but not working as expected?

[Frank123]

the program compiling ok but not working as expected with "RXINT" and it's working well with "Réception USART".

Is't possible to me to change in c code and recompil directly ? How to ?

Frank

[Steve]

Hi Frank,

Aaah, I see the problem now - sorry I was slow on the uptake.

It looks like the EnableCode entry of the RXINT function might need to change from this:

Code: Select all

EnableCode="st_bit(pie1, RCIE);\n"

...to this...

Code: Select all

EnableCode="st_bit(intcon, PEIE);\nst_bit(pie1, RCIE);\n"

[Frank123]

Non ça ne marche pas. C'est la première chose que j'ai essayé.

[Benj]

The RXINT interrupt allows for incoming data to interrupt the program so you can pull it from the incoming UART buffer and process it straight away ready for the next incoming byte.

When the PIC device starts up it enables the UART interface but the receive function is switched off.

Calling the ReceiveByte macro at the start of your program before enabling the interrupt will enable the receive function and your interrupts should work from then on.

[Frank123]

thank you Ben,
it works with it.
I do not understand why one RS232Send is needed before initializing the interrupt but I would look at the C.

Frank