Posted on April 24, 2003 at 09:45Help me to optimize on speed this function of copying from internal memory to external one:
char SRAM_WriteFromBufferToSRAM(unsigned long Addr,unsigned char *buffer, unsigned int count) {
unsigned char *ptr;
ptr = (unsigned long *)&Addr;
PCDR = *(ptr+1) | 0x40;
PBDR = *(ptr+2);
PADR = *(ptr+3);
PDDDR = 0xFF; // output mode
do {
PDDR = *buffer;
buffer++;
ClrBit(PCDR,6); // WE=0
SetBit(PCDR,6); // WE=1
asm {
INC PADR
JRNE loop
INC PBDR
JRNE loop
INC PCDR
loop:
}
} while (--count != 0);
} //SRAM_WriteFromBufferToSRAM
At present moment I have received the following results with this function: A time of copying one byte - 6us.
