SW006010 Microchip Technology, SW006010 Datasheet - Page 28

• Manufacturer Part Number: SW006010
• Description: MPLAB 17C SOFTWARE
• Manufacturer: Microchip Technology

Specifications of SW006010

• Tool Function: Compiler
• Tool Type: Compiler
• Processor Series: PIC17C
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: MPLAB®
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MPLAB
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C17 C Compiler User’s Guide
For example, a function to copy a string from ROM to RAM could be written as follows.
void str2ram(static char *dest, static char rom *src)
{
} /* end str2ram */
As an example, the following code will send a ROM string to USART1 on a
PIC17C756 using the PICmicro MCU C libraries. The library function to send a string
to the USART,
argument, but that string must be in RAM.
Modify the library routine to read from a ROM string.
/* The only changes required to the library routine is to change the
name so the new routine does not conflict with the original routine and
to add the rom qualifier to the parameter.
*/
void putrsUSART1_rom( static const rom char *data )
{
} /* end putrsUSART1_rom */
2.6.13
RAM pointers are either 8 or 16-bit, depending on whether they point to banked (far)
or unbanked (near) RAM.
Pointer arithmetic is affected by the ROM paging and RAM banking of the PICmicro
MCU. Pointers are assumed to be RAM pointers unless declared as ROM.
rom int *p;
char *q;
ram char *r;
2.6.14
User-defined data constructs are included in the symbolic information file from the
linker.
For MPLAB C17, structures located in program memory must have all elements word
aligned.
MPLAB C17 supports anonymous structures.
2.6.15
Bit-fields allow the specification of integer-type members of a struction, which are the
specified number of bits in size. Bit-fields cannot cross byte boundaries and,
therefore, cannot be greater than 8 bits in size.
while( (*dest++ = *src++) != '\0' )
do
{
} while(*data++);
;
while(BusyUSART1());
putcUSART1(*data);
Pointers
Structures
Bit-fields
/* Send characters up to the null */
/* Write a byte to the UASRT */
putsUSART1(const char *str)
/* ROM pointer */
/* RAM pointer (default) */
/* RAM pointer */
/* (explicitly declared) */
, takes a pointer to a string as its
 2002 Microchip Technology Inc.