Help with interrupts pic18f2620

[dansagenius]

Hi there.
please could someone help !! I am pretty new to Proton and i am having troubles configuring things for an interrupt routine for a pic18f2620.
My project requires me to RSIN at 57600baud every second and then to display three bytes of the stream onto a 3dig 7seg display. I have been able to convert the RSIN data and display it but the digits do not update until a new RSIN data has been decoded. I need to use an INTERRUPT to continuously update the 7segs while the rest of the main loop waits for new RSIN data to be displayed. I have tried various code examples but nothing seems to make sense. I have the option of using either a 16F876 or 18F2620 devices and again I am not quite sure which device would be more suitable as they have different methods and requirements for interrupt routines.
I am running at 20Mhz to recieve serial data at 57600 baud which is send out from the host every second.

Advice would be greatly welcomed.

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[pverburg]

in the examples there is a buffered interrupt driven serial example just look at that and add your 7seg code to it.

Paul V.

[Tim]

For starters RSIN is a software serial command and should not be used while interrupts are running. Use Hrsin instead.

Next set up an interrupt using say TMR0, You need to have a very high refresh rate to prevent it flickering.

Here is some code you can use in the interrupt that will handle putting the data out on the display

Select LEDSegNo
    Case 0 
        LEDSeg3 = 0
        LEDPort = LED_DSPLY_DATA#0
        LEDSeg1 = 1
    Case 1
        LEDSeg1 = 0      
        LEDPort = LED_DSPLY_DATA#1
        LEDSeg2 = 1
    Case 2
        LEDSeg2 = 0
        LEDPort = LED_DSPLY_DATA#2
        LEDSeg3 = 1    
    EndSelect
    
    Inc LEDSegNo
    If LEDSegNo > 2 Then LEDSegNo = 0

[dansagenius]

Hi Paul

many thanks for your support. i have now managed to get the display working fine with an interrupt working in the back ground. i have managed to rsin the serial data from the host and decode it onto the display. however... there is one slight problem....

the 7seg display(3 digit) gives the correct values decoded from the serial stream but gives an blank blink every second. the serial stream from the host is sent every second and i am guessing that this is causing the display to blank as the rsin command waits for data.
would you have any ideas how i can keep the display constant and also monitor the serial rsin as well.

best regards

[dansagenius]

hi tim.

many thanks for the sample code.

[Tim]

You have me confused. Unless your disabling interrupts during the RSIN it should not flicker

However I have to reiterate, use HRSIN not RSIN

Can you post your code so I can do a double check on the interrupt handling?