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allenhuffman
Joined: 17 Jun 2019
Posts: 540
Location: Des Moines, Iowa, USA
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| Passing address of rom array into a function. |
 Posted: Tue Feb 04, 2020 9:41 am |
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Based on other threads in this forum dealing with strings, I think this is the way to do it... Am I close? I wasn't able to printf() the ptr[x] value as a number directly, so maybe there's a trick with that.
| Code: | #include <main.h>
#include <stddef.h> // NULL
// Store this in ROM.
rom int8 data1[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
rom int8 data2[] = { 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 };
void function(rom int8 *ptr, int size)
{
printf ("function(0x%x, %d)\r\n", ptr, size);
if (ptr != NULL)
{
for (int idx=0; idx < size; idx++)
{
// Load value from ROM.
int8 value = ptr[idx];
printf ("%d ", value);
}
printf ("\r\n");
}
}
void main()
{
// Call function.
function (data1, 10);
function (data2, 10);
while(TRUE)
{
//TODO: User Code
}
}
// End of main.c
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_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ? |
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allenhuffman
Joined: 17 Jun 2019
Posts: 540
Location: Des Moines, Iowa, USA
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| Posted: Tue Feb 04, 2020 10:45 am |
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We already ran into a snag. How do I move the ROM array to its own file, and "extern" it? I tried variations of "extern", "rom extern", "extern rom", etc.
If we have something like this...
romarrays.c:
| Code: | #include <main.h>
// Store this in ROM.
rom int8 data1[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
rom int8 data2[] = { 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 };
// End of romarrays.c
|
...what lets us access that in other files?
I tried this, and while it compiles, it doesn't work.
| Code: | extern rom int8 data1[];
extern rom int8 data2[]; |
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ? |
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ralph79
Joined: 29 Aug 2007
Posts: 87
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| Posted: Tue Feb 04, 2020 11:15 am |
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My suggestion IMHO (based in some work already made and situations I had to change according to CCS versions) is:
Declare the const variables directly in the main.h file (putting these arrays as globals) and acessing it from other files. |
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allenhuffman
Joined: 17 Jun 2019
Posts: 540
Location: Des Moines, Iowa, USA
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| Posted: Tue Feb 04, 2020 11:24 am |
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Ah, CCS reports I should try "const" right now as there are some issues with "rom" they are working on.
I still had no luck with an extern of a const:
extern const int8 data1[];
extern const int8 data2[];
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ? |
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allenhuffman
Joined: 17 Jun 2019
Posts: 540
Location: Des Moines, Iowa, USA
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| Posted: Tue Feb 04, 2020 11:25 am |
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| ralph79 wrote: | my suggestion IMHO (based in some work already made and situations I had to change according to CCS versions) is:
declare the const variables directly in the main.h file (putting these arrays as globals) and acessing it from other files... |
Yes, doing a #include of the .c or .h file appears to work. All roads always seem to lead back to "put everything in one file using include" to make it go 
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ? |
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