Would you like to write a PIC book with me? - Page 5 - Electronic Circuits Projects Diagrams Free

blueroomelectronics · 13th January 2008, 05:21 PM

I wonder how an AVR vs 18F PIC thread would look, or AVR vs dsPIC...

Thunderchild · 13th January 2008, 05:28 PM

well as I'm new to pics I don't know if 18F is more difficult to program in assembly than 16F pics
but I think one 16F should be mentioned

blueroomelectronics · 13th January 2008, 05:40 PM

Quote:

Originally Posted by Thunderchild

well as I'm new to pics I don't know if 18F is more difficult to program in assembly than 16F pics
but I think one 16F should be mentioned

Ahh there's the popular belief, IMO the 18F is no harder to learn than a modern 16F.
The minimal need for bank switching and that RAM starts at 0x00 helps.
You also never need to worry about RMW if you use LATx
The 18F was designed with C in mind and you can even get a decent free C18 compiler.
IMO the 18F1320 is a nice 18pin starter chip, it's not as fully featured as many (no comparators, no SPI, no internal clock 4xPLL

) but it's still a great chip to start with.

bananasiong · 15th January 2008, 05:32 PM

Yes, it's good to have the knowledge of 14-bit core's 35 instructions. Many of the 75 instructions in 18F are similar to 16Fs'. The bank switching in PIC18 makes my life easier. When using PIC16, I always check the datasheet for the bank of that particular register (even the 'find' of pdf can be used, but it is still time consuming).
I don't know C18, even haven't used all the 75 instructions in PIC18 :P

Thunderchild · 15th January 2008, 05:41 PM

Quote:

Originally Posted by bananasiong

Yes, it's good to have the knowledge of 14-bit core's 35 instructions. Many of the 75 instructions in 18F are similar to 16Fs'. The bank switching in PIC18 makes my life easier. When using PIC16, I always check the datasheet for the bank of that particular register (even the 'find' of pdf can be used, but it is still time consuming).
I don't know C18, even haven't used all the 75 instructions in PIC18 :P

exactly learning the 16F MCUs is 2/3 the way of learning the 18F as you already know the MCU architechture and half the instructions

blueroomelectronics · 15th January 2008, 06:12 PM

I've got to start posting 18F tips of the day.
Todays:
You can treat W just like any other file register.
Eg:

Code:

decfsz WREG

Very handy for delay routines...

Thunderchild · 15th January 2008, 06:33 PM

well have you any pages ready to show us ?

blueroomelectronics · 15th January 2008, 09:47 PM

Soon Soon, I've been so busy lately I've not had time to work on the book.

bananasiong · 16th January 2008, 04:27 PM

Quote:

Originally Posted by blueroomelectronics

I've got to start posting 18F tips of the day.
Todays:
You can treat W just like any other file register.
Eg:

Code:

decfsz WREG

Very handy for delay routines...

Oh really??!!?? I didn't know about this even I'm using a PIC18

Is this applied for all the instructions that associated with the RAM?

Is WREG defined in the include file? Or can I straight away use w?

blueroomelectronics · 16th January 2008, 04:56 PM

You can use WREG right away it is defined in the .inc file, it's just another SFR in the 18F and above PICs. I got the idea from Pommies servo program (he does it with the 16F PIC using an addlw $FF sneaky)

Code:

Delay        
    dcfsnz  WREG    
    return              
    bra     Delay

bananasiong · 16th January 2008, 05:01 PM

Oh I see, thanks

I'm using the Delay part of Pommie's servo program as well. Still remember it is 8*w instruction cycle

Didn't notice WREG in 18F, seems I have to somehow modify my program especially the delay part.

Funny NYPD · 23rd January 2008, 02:20 AM

waiting for the new book.

43617373 · 29th March 2008, 07:41 PM

This was such a great project, what ever happened to it? Is there anything I can do to help it get on track again?

blueroomelectronics · 29th March 2008, 07:46 PM

I've been so busy with the Ladybug project I've only got a little time to work on it but I'll keep going.

mashersmasher · 5th April 2008, 06:04 PM

if you guys did this i'd get it and make a donation regardless. i've found it a bit tricky finding pic info and making a free information book would be a really big help for all of us new people. i was deathly afraid of pics when i started so i went with a bs2. now i know how inefficient they are and how much cheaper/better pics alone are.

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13th January 2008, 05:21 PM	#61
blueroomelectronics	I wonder how an AVR vs 18F PIC thread would look, or AVR vs dsPIC... __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

13th January 2008, 05:28 PM	#62
Thunderchild	well as I'm new to pics I don't know if 18F is more difficult to program in assembly than 16F pics but I think one 16F should be mentioned __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) www.simonsphotography.org.uk/ - My other hobby www.rushdenrotaract.org.uk/ - make a difference and have fun ! Never buy "Trust" products, all mine broke !!!

15th January 2008, 05:32 PM	#64
bananasiong	Yes, it's good to have the knowledge of 14-bit core's 35 instructions. Many of the 75 instructions in 18F are similar to 16Fs'. The bank switching in PIC18 makes my life easier. When using PIC16, I always check the datasheet for the bank of that particular register (even the 'find' of pdf can be used, but it is still time consuming). I don't know C18, even haven't used all the 75 instructions in PIC18 :P __________________ bananasiong

15th January 2008, 06:12 PM	#66
blueroomelectronics	I've got to start posting 18F tips of the day. Todays: You can treat W just like any other file register. Eg: Code: decfsz WREG Very handy for delay routines... __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

15th January 2008, 06:33 PM	#67
Thunderchild	well have you any pages ready to show us ? __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) www.simonsphotography.org.uk/ - My other hobby www.rushdenrotaract.org.uk/ - make a difference and have fun ! Never buy "Trust" products, all mine broke !!!

15th January 2008, 09:47 PM	#68
blueroomelectronics	Soon Soon, I've been so busy lately I've not had time to work on the book. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

16th January 2008, 04:56 PM	#70
blueroomelectronics	You can use WREG right away it is defined in the .inc file, it's just another SFR in the 18F and above PICs. I got the idea from Pommies servo program (he does it with the 16F PIC using an addlw $FF sneaky) Code: Delay dcfsnz WREG return bra Delay __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

16th January 2008, 05:01 PM	#71
bananasiong	Oh I see, thanks I'm using the Delay part of Pommie's servo program as well. Still remember it is 8*w instruction cycle Didn't notice WREG in 18F, seems I have to somehow modify my program especially the delay part. __________________ bananasiong

23rd January 2008, 02:20 AM	#72
Funny NYPD	waiting for the new book. __________________ F.N.

29th March 2008, 07:41 PM	#73
43617373	This was such a great project, what ever happened to it? Is there anything I can do to help it get on track again? __________________ Mechanical Engineers make weapons. Civil Engineers make targets.

29th March 2008, 07:46 PM	#74
blueroomelectronics	I've been so busy with the Ladybug project I've only got a little time to work on it but I'll keep going. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

5th April 2008, 06:04 PM	#75
mashersmasher	if you guys did this i'd get it and make a donation regardless. i've found it a bit tricky finding pic info and making a free information book would be a really big help for all of us new people. i was deathly afraid of pics when i started so i went with a bs2. now i know how inefficient they are and how much cheaper/better pics alone are.