Search found 17 matches

Couple of things about RS485, serial code and PICs

(a) occasionally some serial PIC code of mine would hang or freeze, usually permanently sometimes for a second or two. I think this was due to var ...

Amateur radio folk have implemented AX25, not the same thing of course but it shows it is possible to do synchronous (at the packet level) communications. ... I don't know much/anything about x25 but ...

It is VERY important that you do not use the 16(15!) byte fifo buffer which is part of the uart in most modern PCs. Make sure it is disabled.

Worst case scenario is to use big end of line delays - ...

Hi, you may be in an area were machine code is necessary to ensure the timing is correct. I have built a couple of designs using PICDREAM, this is a text generator that displays a mono colour bar, an ...

I have added RAM and Flash EEprom to a 18C801, and executed code from either. I suppose it is similar...
8-)
Ian

Actually I had posted the query on the microchip website and got this reply - I have yet to try this and will do so tomorrow...

This error message occurs when attempting to import a .HEX, .COD, ...

I use CCS's C compiler but in its own IDE, it compiles C to .hex and .cof files.

I start up MPLAB 7.10, select a device and tell it I have an ICD2. I have also tried starting a project, doesn't see ...

A really inefficient way to convert floats is to use sprintf to convert floats to an ascii string, you can then see what value you have and it may be a more convenient way to store things anyway. You ...

Many thanks, the URL was just what I was looking for.

On reflection I need to find a LLC and MAC that suits RS485 and works with the network layers and above of TCP/IP ( which I know and love)

. ...

A ling time ago, I implemented several RS485 networks using a Master-Slave approach, slow baud rates, delays to allow line turnaround, resistors to bias the line to avoid false startbits when all driv ...

Many many thanks for your reply, Jarek.

I have pasted your code into my compiler and I still get a CCS internal error 65:0:11, even after altering the memory size in the device editor.

I use PCH ...

Just spotted that #build (RESET=0xF000)
will multiply that address by 2, it assumes the operand is a word address
I guess. Now 0xF000 * 2 is 0x1E000, a byte address

And again the #build is only ...

The code below generates the machine code listed ... the #build address is 4k too low, I had expected the jump at 0xE000 to be at 0xF000.
Is there proper documentation for the #build command?

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Thanks Jarek, I have also emailed you, your advice above works great, provided the addresses are less than 64k, here is code that breaks

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// Bug/Feature in #ORG ... it is restricted to 64K
/ ...

Hi, I am currently working with a 18C801, this has no internal ROM and allows up to 2MBytes of external memory. Curent wirewrap board has 128k of flash and 128k of RAM.

I want to download executabl ...