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things i do not know , of which there are many - here are 2

 
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asmboy



Joined: 20 Nov 2007
Posts: 2128
Location: albany ny

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things i do not know , of which there are many - here are 2
PostPosted: Wed Jun 03, 2015 2:10 pm     Reply with quote
I'm trying to improve a storage efficent data structure using
an INT1 sparse array to record fault states in 1536 different
addressable locations.
presently the results of a scan are stored in this:

INT1 missing[96][16]

which fits in 192 BYTES of an 18F4620 PIC

at start of a 'run' all elements set to 0. With nested loops. ;-((

Then , When external devices are scanned a single array element at

missing[address][excite]=1;

is set true if one of 96 addresses when cross tested by
one of 16 line-exciters is not responding.

After a complete 1536 scan, only a very few or sometimes NONE of the bits will be set in 'missing[][]'

Without using nested loops i'd like to be able to also view the 1536
locations as 192 bytes , testing each byte for non-zero and THEN decoding
what actual bit is "it" with a bit of bit-shifting.

I'd also like to be able to RAPIDLY rezero the 192 bytes without loops too.

Ideally i would aim a pointer somewhere and stuff++ 192 ASCIIZ's
down it's throat ;-))

I have not figured out the appropriate structure to do it with.
Ideas welcome.
-------
And then there is this:

I ONLY use the command line.

I have long wanted to add a default alternative
at compile time for code libraries of my own
outside the current project folder and outside the CCS mothership
version folder as well

i have struck out completely with making
I=" path data ......"
work by creating a like named .PJT or .CCSPJT file with the
prefix of my source that contains

I="C:\....path ......;" line in it.

Is there a known "works in the source file itself " compiler directive
that basically does an
I+=" more path info;"
type of function in my source file header right at line #1 ??

so i can ADD to the CCS intrinsics ??
and not replace it ?
Is there such a directive i can add to my source file ?

I just can't locate it , if it is real .
Ttelmah



Joined: 11 Mar 2010
Posts: 19439

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PostPosted: Wed Jun 03, 2015 2:26 pm     Reply with quote
Union.....
Or use #byte.

So:
Code:

union {
   int1 missing[96][16];
   int8 b[192];
} data;


data.missing[x][y] accesses the bits just as missing does, but data.b[n] accesses the bytes.

This is generic C, as opposed to any 'special' CCS feature. The next is an alternative CCS way of doing this:
Code:

int1 missing[96][16];
int8 b[192];
#byte b=missing //this locates 'b' into the same memory space as missing


One of the features of #byte, is that if called with an already declared variable, it locates this at the given address. In this case the address of 'missing'.

On zeroing, memset:
Code:

memset(b,0,192);


Using the byte declarations, will set all 192 bytes to zero.

Use the PATH.

Have a .CMD file to set his so the default search location at the start is where you want.
Do your compile.
Reset PATH
jeremiah



Joined: 20 Jul 2010
Posts: 1335

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PostPosted: Wed Jun 03, 2015 2:41 pm     Reply with quote
EDIT: Just saw I was beaten to the punch but anyways I was gonna say:

Code:

#case
#include <24EP512GU810.h>

typedef struct{
   int8 b0 : 1;
   int8 b1 : 1;
   int8 b2 : 1;
   int8 b3 : 1;
   int8 b4 : 1;
   int8 b5 : 1;
   int8 b6 : 1;
   int8 b7 : 1;
} bits_t;

typedef union{
   int1 missing[96][16];
   unsigned int8 bytes[192];
   bits_t bits[192];
} view_t;

view_t view;

void main()
{

   view.missing[0][0] = 1;
   view.bytes[1] = 0x23;
   view.bits[2].b1 = 1;
   memset(&view,0,sizeof(view_t));
}




LST file results:
Code:

....................    view.missing[0][0] = 1;
00288:  BSET.B  1000.0
....................    view.bytes[1] = 0x23;
0028A:  MOV.B   #23,W0L
0028C:  MOV.B   W0L,1001
....................    view.bits[2].b1 = 1;
0028E:  BSET.B  1002.1
....................    memset(&view,0,sizeof(view_t));
00290:  MOV     #1000,W1
00292:  MOV     #0,W2
00294:  REPEAT  #BF
00296:  CLR.B   [W1++]


Nothing new new though as Ttelmah already covered that.

That's with 5.044

EDIT: sorry still had my pic24 in there, here is the output for yours
Code:

....................    view.missing[0][0] = 1;
00030:  BSF    04.0
....................    view.bytes[1] = 0x23;
00032:  MOVLW  23
00034:  MOVWF  05
....................    view.bits[2].b1 = 1;
00036:  BSF    06.1
....................    memset(&view,0,sizeof(view_t));
00038:  CLRF   FEA
0003A:  MOVLW  04
0003C:  MOVWF  FE9
0003E:  CLRF   00
00040:  CLRF   02
00042:  MOVLW  C0
00044:  MOVWF  01
00046:  BRA    0004


Last edited by jeremiah on Wed Jun 03, 2015 4:18 pm; edited 1 time in total
asmboy



Joined: 20 Nov 2007
Posts: 2128
Location: albany ny

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PostPosted: Wed Jun 03, 2015 3:10 pm     Reply with quote
Thanks for the assist to you both.

I don't mind admitting ignorance, but i try hard not to be wrong. Very Happy
Your generosity with good advice is much appreciated

-d-
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