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gfbankston
Joined: 21 Jul 2014
Posts: 35
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| pointer to ROM |
 Posted: Fri Jul 25, 2014 7:22 am |
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Hello,
THe following works in CodeVision and XC8 compiler, but not in CCS
const unsigned char Test_Msg[]={"Hello test"};
void flash2LCD(const unsigned char *);
....
flash2LCD(Test_Msg);
Of course, to print to my graphic LCD, I must do a lot. I have designed fonts as well and only send 8 bits at a time, and 'draw' the characters.
ROM pointer arithmetic is critical for this code.
I saw in the manual how to do a one time simple data access to a table, but how does one pass the pointer to a routine. The manual indicates you cannot, but other compilers do it (in PIC XC8 works fine).
TIA
GlenB |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Jul 25, 2014 7:41 am |
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The quickest way to solve this one is to add the line shown in bold below:
| Quote: |
#include <18F4520.h>
#device PASS_STRINGS=IN_RAM
#fuses INTRC_IO, BROWNOUT, PUT, NOWDT
#use delay(clock=4M)
#use rs232(baud=9600, UART1, ERRORS)
const unsigned char Test_Msg[]={"Hello test"};
void flash2LCD(unsigned char *msg)
{
printf(msg);
}
//==========================
void main()
{
flash2LCD(Test_Msg);
while(1);
} |
If you do that, it will compile and you will get this output in MPLAB simulator:
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