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bells_electronics
Joined: 05 Dec 2009
Posts: 40
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| Store Table in ROM with dsPIC30F |
 Posted: Sun Apr 22, 2012 9:46 am |
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Hello guys
hope all of you are good, sir i have a problem i want to store a static Table in the ROM then i want to call its element during execution,
by using the key word "const" i can achieve my goals in 16F / 18F PICs but in dsPIC30F it shows garbage values, please help me
| Code: |
#include <30F4012.h>
#FUSES NOWDT, NOPROTECT,NODEBUG, NOBROWNOUT, HS, NOPUT, PR
#use delay(clock=20M, crystal)
unsigned int16 const Table[50] = {500, 600, 700, 100, .... 4000}; // gives garbage Values
//const unsigned int16 Table[] = {500, 600, 700, 100, .... 4000}; // gives garbage Values
//unsigned int16 Table[] = {500, 600, 700, 100, .... 4000}; // Works Perfect but it consumes all the RAM Space
unsigned int16 x;
unsigned int8 i;
void main()
{
i=10;
while(TRUE)
{
x = Table[i];
}
}
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bells_electronics
Joined: 05 Dec 2009
Posts: 40
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| Posted: Sun Apr 22, 2012 10:21 am |
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it works fine when i use data type "unsigned int8"
| Code: |
const unsigned int8 Table[] = {50, 60, 70, 100, .... 200}; //50 elements
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again it works when i don't use "Const" with "unsigned int16"
| Code: |
unsigned int16 Table[] = {50, 60, 70, 100, .... 200}; //50 elements
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never runs on dsPIC30F
| Code: |
const unsigned int16 Table[] = {50, 60, 70, 100, .... 200}; //50 elements
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but the Problem is that my Table elements are 16bit.
my compiler version is 4.057 |
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bells_electronics
Joined: 05 Dec 2009
Posts: 40
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| Posted: Sun Apr 22, 2012 8:44 pm |
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any one? please Sir i need the solution  |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Apr 23, 2012 8:43 pm |
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You didn't give us enough information to work on your problem. Your
test program is incomplete, and it's not compilable. You didn't tell us
exactly how the program fails. You just said "never runs on dsPIC30F "
or "in dsPIC30F it shows garbage values".
Post a short, complete, compilable test program. Example:
| Code: |
#include <18F4520.H>
#fuses INTRC_IO, NOWDT, BROWNOUT, PUT, NOLVP
#use delay(clock=4M)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
int16 const Table[4] = {0x0123, 0x4567, 0x89AB, 0xCDEF};
//================================
void main()
{
int8 i;
for(i = 0; i < 4; i++)
printf("%lx \n\r", Table[i]);
while(1);
}
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That program displays the following output (it's correct):
| Code: |
0123
4567
89ab
cdef
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Post your test program, very similar to the one shown above.
Post the output that it displays. |
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bells_electronics
Joined: 05 Dec 2009
Posts: 40
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| Posted: Mon Apr 23, 2012 10:13 pm |
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this code displays correct values up to 2165 after that it starts showing garbage values
| Code: |
#include <30F4012.h>
#FUSES NOWDT, NOPROTECT,NODEBUG, NOBROWNOUT, HS, NOPUT, PR
#use delay(clock=20M, crystal)
#use rs232(baud=9600,parity=N,xmit=PIN_C13,rcv=PIN_C14,bits=8)
const unsigned int16 Table[256] = {
624, 661, 697, 734, 771, 808, 844, 881, 918, 954, 991,1028,1064,1101,1138,1175,
1211,1248,1285,1321,1358,1395,1431,1468,1505,1542,1578,1615,1652,1688,1725,1762,
1798,1835,1872,1909,1945,1982,2019,2055,2092,2129,2165,2202,2239,2276,2312,2349,
2386,2422,2459,2496,2532,2569,2606,2643,2679,2716,2753,2789,2826,2863,2899,2936,
2973,3010,3046,3083,3120,3156,3193,3230,3266,3303,3340,3377,3413,3450,3487,3523,
3560,3597,3633,3670,3707,3744,3780,3817,3854,3890,3927,3964,4000,4037,4074,4111,
4147,4184,4221,4257,4294,4331,4367,4404,4441,4478,4514,4551,4588,4624,4661,4698,
4734,4771,4808,4845,4881,4918,4955,4991,5028,5065,5101,5138,5175,5212,5248,5285,
5322,5358,5395,5432,5468,5505,5542,5579,5615,5652,5689,5725,5762,5799,5835,5872,
5909,5946,5982,6019,6056,6092,6129,6166,6202,6239,6276,6313,6349,6386,6423,6459,
6496,6533,6569,6606,6643,6680,6716,6753,6790,6826,6863,6900,6936,6973,7010,7047,
7083,7120,7157,7193,7230,7267,7303,7340,7377,7414,7450,7487,7524,7560,7597,7634,
7670,7707,7744,7781,7817,7854,7891,7927,7964,8001,8037,8074,8111,8148,8184,8221,
8258,8294,8331,8368,8404,8441,8478,8515,8551,8588,8625,8661,8698,8735,8771,8808,
8845,8882,8918,8955,8992,9028,9065,9102,9138,9175,9212,9249,9285,9322,9359,9395,
9432,9469,9505,9542,9579,9616,9652,9689,9726,9762,9799,9836,9872,9909,9946,9983};
unsigned int16 i;
// ======================================
void main()
{
while(1)
{
for(i = 0; i < 256; i++)
{
printf("%lu \n\r", Table[i]);
delay_ms(500);
}
puts(" ---------- ");
}
} |
if i remove the word "const" then it shows the correct values till the end
| Code: |
#include <30F4012.h>
#FUSES NOWDT, NOPROTECT,NODEBUG, NOBROWNOUT, HS, NOPUT, PR
#use delay(clock=20M, crystal)
#use rs232(baud=9600,parity=N,xmit=PIN_C13,rcv=PIN_C14,bits=8)
unsigned int16 Table[256] = {
624, 661, 697, 734, 771, 808, 844, 881, 918, 954, 991,1028,1064,1101,1138,1175,
1211,1248,1285,1321,1358,1395,1431,1468,1505,1542,1578,1615,1652,1688,1725,1762,
1798,1835,1872,1909,1945,1982,2019,2055,2092,2129,2165,2202,2239,2276,2312,2349,
2386,2422,2459,2496,2532,2569,2606,2643,2679,2716,2753,2789,2826,2863,2899,2936,
2973,3010,3046,3083,3120,3156,3193,3230,3266,3303,3340,3377,3413,3450,3487,3523,
3560,3597,3633,3670,3707,3744,3780,3817,3854,3890,3927,3964,4000,4037,4074,4111,
4147,4184,4221,4257,4294,4331,4367,4404,4441,4478,4514,4551,4588,4624,4661,4698,
4734,4771,4808,4845,4881,4918,4955,4991,5028,5065,5101,5138,5175,5212,5248,5285,
5322,5358,5395,5432,5468,5505,5542,5579,5615,5652,5689,5725,5762,5799,5835,5872,
5909,5946,5982,6019,6056,6092,6129,6166,6202,6239,6276,6313,6349,6386,6423,6459,
6496,6533,6569,6606,6643,6680,6716,6753,6790,6826,6863,6900,6936,6973,7010,7047,
7083,7120,7157,7193,7230,7267,7303,7340,7377,7414,7450,7487,7524,7560,7597,7634,
7670,7707,7744,7781,7817,7854,7891,7927,7964,8001,8037,8074,8111,8148,8184,8221,
8258,8294,8331,8368,8404,8441,8478,8515,8551,8588,8625,8661,8698,8735,8771,8808,
8845,8882,8918,8955,8992,9028,9065,9102,9138,9175,9212,9249,9285,9322,9359,9395,
9432,9469,9505,9542,9579,9616,9652,9689,9726,9762,9799,9836,9872,9909,9946,9983};
unsigned int16 i;
// ======================================
void main()
{
while(1)
{
for(i = 0; i < 256; i++)
{
printf("%lu \n\r", Table[i]);
delay_ms(500);
}
puts(" ---------- ");
}
}
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Ttelmah
Joined: 11 Mar 2010
Posts: 19545
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| Posted: Tue Apr 24, 2012 8:58 am |
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Compiler problem.
Seriously, 4.057, was before V4 really started to work properly, It was about 4.070, before 90% of things worked right, and we are now up in the 4.124 area _over sixty releases latter_.....
Tried exactly your code on a current compiler, and it runs fine with const.
Best Wishes |
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bells_electronics
Joined: 05 Dec 2009
Posts: 40
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| Posted: Tue Apr 24, 2012 11:27 am |
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My compiler version is 4.057.
I see I need to upgrade my CCS C Complier. |
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