Serin after instant interupt?

[HenrikOlsson]

Hi,
Can you you use the handshake feature of SERIN2?

Is there a specific range of values of the byte you are sending? I'm trying to see how the actual bitpattern looks and if it might be possible to fool it by, for example, setting up the sender to send 2 stopbits but the receiver is set to 1 stopbit or something.

That way the startbit trips the interrupts then the first databit acts as the actual startbit, seven more databits, first stopbit acts as the 8th databit and the second stopbit acts as actual stopbit.

Not saying it'll work just thinking out loud.

/Henrik.

[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