Effect of DT_INT14 on Serin2 or DebugIn

[retepsnikrep]

Well my osc is 8mhz and data on serin2 or debug will be 10400,8,N,1 worst case scenario.

Hserin will be interupting every byte but only to move the data to the buffer. Have to see what happens.

[retepsnikrep]

Just resurrecting this. I'm using an 18F2620/80 chip.

Let's assume I must use serin2 and serout2 for some serial stuff so can't use DT interrupts to create a timer.

How can I implement a 100ms or 1S tick timer with the above restriction?

[mpgmike]

• ...so can't use DT interrupts to create a timer.

I guess this is a good place to start. Why not? You can use DT_INTs with every single Interrupt your PIC is capable, and all at the same time. You can have a Timer Interrupt and also multiple UART Interrupt Handlers, all with DT_INTs.

If you haven't already, read the book a few members assembled as a tutorial on DT_INTs:

http://dt.picbasic.co.uk/Site/Introduction

[retepsnikrep]

My understanding is Interrupts interrupt software based serial routines like Serin2 and break them..
Have I missed something? I can't use hardware serial in this application due to pinout constraints.

[richard]

My understanding is Interrupts interrupt software based serial routines like Serin2 and break them..
Have I missed something? I can't use hardware serial in this application due to pinout constraints

no , thats pretty right any software timed function is compromised

if you use an asm timer interrupt to set a flag to be processed in main code when needed and your serial baud rate is not too high
you may get away with it. i would use define int rather than dt ints to minimise overheads

another option is to disable the int when serial transactions are being carried out

better still use a modern chip like k42 series with peripheral pin management , nearly any pin can be any function
and they have 2 esuarts

this ticker , what sort of range does it need , i tend to use a 4mS timer counting a 16 bit counter , allows me to measure
65535x4mS periods a 4 minute-ish rollover