8-bit Microcontrollersのトピックdouble Rx interrupts on HCS08QG SCI

double Rx interrupts on HCS08QG SCI

TonvW — Thu, 24 Mar 2011 14:39:04 GMT

I have used the SCI intterface before and with succes but now it's nothing but trouble.

I'm expecting to receive 8 bytes, but every byte is received twice!

(when 'ABCDEFGH' is sent, 'AABBCCDD' is received.

Please give me some advise. I'm using the interrupt routine below:

__interrupt void isrVscirx(void)

{

RxBuf[RcvCount] = SCID; // store in buffer

RcvCount++;

if (RcvCount==RXMAXBYTES) {

AsuroDataValid = TRUE;

RcvCount =0;

SCIC2_RE =0;

SCIC2_RIE =0;

}

(void) SCIS1; // reset flag

}

Thank you.

Re: double Rx interrupts on HCS08QG SCI

tonyp — Thu, 24 Mar 2011 15:45:59 GMT

I believe before you read the SCID register, you must read the SCIS1 register. This is part of the flag clearing mechanism. (Simply make the last statement first.)

Re: double Rx interrupts on HCS08QG SCI

TonvW — Thu, 24 Mar 2011 22:23:57 GMT

Thank you very much for your reply!

it works fine this way.