USART RX Interrupt

Widgetman · Post by **Widgetman** » Mon Mar 07, 2011 1:39 pm

Hi,
I was wondering if anyone knew how the DelayMS call worked in reference to a interrupt on the USART. I have a main loop where I use the ReadSerial call then if no charcters are coming in I proceed to toggle some leds then delay 5 seconds. My question is after I drop into the DelayMS routine will a RX Interrupt pull me out to service the incoming charcters. Any insight would be greatly appreciated.
thanks

be80be · Post by **be80be** » Mon Mar 07, 2011 2:09 pm

Yes it jump to the RX code thats set for interrupt

Jerry Messina · Post by **Jerry Messina** » Mon Mar 07, 2011 4:03 pm

It will assuming you use an interrupt-driven module like ISRRX.BAS, since the regular USART.BAS module by itself doesn't use interrupts.

gramo · Post by **gramo** » Tue Mar 08, 2011 9:37 am

Hi Widgetman,

I understand you're coming from the viewpoint of using interrupts, although I was a little confused by your example:

Widgetman wrote:I have a main loop where I use the ReadSerial call then if no charcters are coming in I proceed to toggle some leds then delay 5 seconds.

I interpret that as a quick status flag check of RCIF, without the use of an interrupt driven event...

In any case; if an interrupt was configured for USART then an incoming byte would interrupt the code while in the DelaymS call. When complete, it would return to where-ever it left off.

A caveat - the interrupt is disabled before the 5 second delay. Although you may land yourself buffer overruns or lost data with this tact. Just putting it out there

Swordfish

USART RX Interrupt

USART RX Interrupt

Re: USART RX Interrupt