Serin after instant interupt?

[retepsnikrep]

Just bumping this old thread as i want to revisit the idea.

I don't have access to the transmitting device so can't add bits or change format etc.
I can't use handshaking etc.
My PIC18F2680 Hardware Usarts/hserin etc are already committed.

I want to trigger an interrupt when a pin goes low (it idles high) then receive that incoming serial data with Serin2
If it jumps to the Serin2 quickly enough will it work? Or will I lose that first bit.

The actual first byte of incoming data isn't critical (it's a header) but the next 4-5 bytes are.

[Ioannis]

Say that you use the low-going edge as an interrupt trigger.

Then you start the Serin command that waits for the negative going edge. My guess is that it will loose the first byte and then will receive next one.

So, I would make two same characters as a start, one will be lost, the second will be the wait character, and then start getting the payload.

Ioannis

[retepsnikrep]

I don't have any control over the transmitting device.. So I can't add bytes.

[mpgmike]

You could also manually read the RCREG directly.

[retepsnikrep]

I'm using software serin2 on a non usart pin.. My hardware UART are taken.

[Ioannis]

Any chance to use a PIC with two USARTs?

Ioannis