Let's learn MPLAB X

Status
Not open for further replies.
Thats pretty bad, in the C handbook it states that XC 8 dosnt use any of the extended code set, I wonder if thats just the free (lite) version. Bit of a dirty trick though, dosnt bode well for Atmel does it.
 
I've just checked a disassembly of xc8 and there is no padding that I can see. Maybe Microchip removed it as the code looks pretty efficient to me.

Mike.
Example,
Code: 
!            buffer[buflen-1]=GetRXFifo();
0x186: CALL 0x1DF
0x187: MOVLB 0x0
0x188: MOVWF 0x5C
0x189: MOVF 0x5C, W
0x18A: MOVWF 0x2D
!            if(buffer[buflen-1]=='E'){
0x18B: MOVLW 0x45
0x18C: XORWF 0x2D, W
0x18D: BTFSS STATUS, 0x2
0x18E: GOTO 0x192
!                //we have colour info
!                parse();
0x18F: CALL 0x36
//I'm particularly impressed with the next 3 lines. Very efficient.
!                buffer[buflen-1]=0;
0x190: MOVLB 0x0
0x191: CLRF 0x2D
!            }
!        }
!        if(CCP1IF!=0){
0x192: MOVLB 0x0
0x193: BTFSS PIR4, 0x0
0x194: GOTO 0x167
!            CCP1IF=0;
0x195: BCF PIR4, 0x0
!            Count++;
0x196: MOVLW 0x1
0x197: ADDWF Count, F
0x198: MOVLW 0x0
0x199: ADDWFC 0x2F, F
!            if(Count==500){
0x19A: MOVLW 0xF4
0x19B: XORWF Count, W
0x19C: BTFSS STATUS, 0x2
0x19D: GOTO 0x167
0x19E: DECF 0x2F, W
0x19F: BTFSS STATUS, 0x2
0x1A0: GOTO 0x167
!                Count=0;
0x1A1: CLRF Count
0x1A2: CLRF 0x2F
0x1A3: GOTO 0x167
 
Are you on the 60 day trial version though? (well that code example). The article nigel linked to does say, the guy think MC will remove the padding at some point. I didnt look when it was written though, the conclusion was MC was holding off as a favour to companies that had supplied compilers when they didnt have any. I find it hard to believe MC would give a rats about anyone else's business though, but I might just be cynical seeing as I hang out with you lot .
 
Nigel Goodwin said:
I tried my IR tutorial, which Ian had converted to C - and it didn't work at all. I looked into why, and the loops take too long to read the IR pulses.
Click to expand...
Thanks for testing.... I'll re-write to use the CCP module.... Then it will work... I'm sure I compiled it in "free" mode... Perhaps not!!
 
Looks like I may have spoke too soon. It looks like some padding has been removed but I just tried the example linked above with the following result.
Code: 
!    maxDev=CCPR1L>>4;
0x167: MOVLB 0x5
0x168: MOVF CCPR1, W
0x169: MOVLB 0x0
0x16A: MOVWF 0x5D
0x16B: MOVLW 0x4
0x16C: LSRF 0x5D, F
0x16D: DECFSZ WREG, F
0x16E: GOTO 0x16C
0x16F: MOVF 0x5D, W
0x170: MOVWF 0x5E         // superfluous code
0x171: MOVF 0x5E, W
0x172: MOVWF maxDev

Mike.
 
Actually scrub that, the price with the compiler and debugger isnt that bad, way cheaper than MC.....
 
What a lot of people don't know is that you can install and use the compiler in free mode and once your project is complete you can reinstall (just xc8) and activate the 60 day free trial.

Mike.
 
This really doesn't look that bad figure I post it here too $29 when you need the full xc8
 
Hi Burt...

That is a monthly subscription... When I tried to buy it, it wouldn't allow me to.. It was £24.00, but I had to pay at least 12 of them...
 
Ian Rogers said:
Hi Burt...

That is a monthly subscription... When I tried to buy it, it wouldn't allow me to.. It was £24.00, but I had to pay at least 12 of them...
Click to expand...
LOL I have seen shared server hosting packages like that. ONLY £12 a month (but you pay 24 months upfront).
 
Status
Not open for further replies.

Similar threads

P
  • Question
MPLAB X How do I make a release version?
Replies
15
Views
3K
granddad
P
  • Question
MPLAB X pulling my hair out again.
Replies
5
Views
5K
Pommie
P
S
PICKIT3 not recognised in MPLAB
Replies
11
Views
3K
tumbleweed
T
P
  • Question
None existant errors (MPLAB X)
2
Replies
20
Views
4K
Pommie
P
Mplab X 6.0 now what
Replies
10
Views
2K
be80be
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…