Search found 21 matches

If I have the Timer1 setup to trigger an interrupt when it rolls over will it still set the TMP1IF bit even if the ISR isn't called when I'm in the SPI interrupt?

I'm trying to find a way to create ...

Ttelmah,

You've got me confused regarding the timer. I'm using Timer1's interrupt to increment my Tick variable at a rate of 16.3ms/tick.

I'm lost as to what you are suggesting. Can you give m ...

Ttelmah,

Here's my timer routine where I'm incrementing the Tick variable:

//****************************************************************************
// Timer 1 Interrupt - used to setup a ...

I apologize for not giving a clear explanation of just what our SPI slave system has to do. The master sends a "command byte" and the slave has to return a "sync byte" of 0X5A. T ...

Ttelmah,

Thanks for the info. I appreciate all the help folks give on this forum. This is a great resource.

I'm still running into a real can of worms with this SPI routine. If I use this for ...

John P,

That might work but as is usual for one of our projects - we've run out of free inputs. I do like your idea though.

Richard

John P,

Unfortunately we don't (or can't) influence the customer and their comm scheme. We're just a small part of their overall system. They won't even tell us what the inter-byte delay can be. ...

Ttelmah,

I agree that my scheme isn't pretty or "proper" but it is working. We need to receive 3 bytes. We need to send 0x5A back to the master as the 1st byte is received, call this on ...

John,

The problem we're having is if the customer's computer (master) hangs during the 3 byte transmission to our slave. If we don't tickle the WDT within 1 sec it will reset our system. I'm goin ...

Thanks Telmah. I think you have made the issue more understandable. I'm now going to have to figure out how to implement the monitor code.

Thanks again,

Richard

Actually I am using the SPI interrupt. Our issue is what happens if the master stops the transmission before all 8 bits are received? If the master (customer's computer) hangs during a transmission w ...

Hi Folks,

In our application we have a PIC18F24K22 set up as the slave SPI. Our code is working fine but there is a small possibility that if the master controller (our customer's responsibility) ...

PCM,

Thanks for the heads-up. I searched the forum but didn't do a very good job. I just wanted a second opinion and you pointed me to one. That's the beauty of this forum.

Richard

I don't understand why you say it is bizarre. The hardware team designed the circuit in such a way that I am forced to use the hardware SPI function on the chip (18F24K22). We have other devices tha ...

Hi Folks,

In my application I am forced to use the HW SPI due to conditions out of my control. I need to write 10 bits to the chip 2 bits of address and 8 bits of data. I can't use the CCS suppli ...