> I am trying to access a sfr with a pointer (mcs51 P2, P2MDOUT, ...)
I use the following function for reading of arbitrary SFR:
#define sfr1(A) case A&0x7F: __asm mov _SFR,A __endasm; break;
#define sfr16(A) sfr1(A) sfr1(A+1) sfr1(A+2) sfr1(A+3) sfr1(A+4)
sfr1(A+5) sfr1(A+6) sfr1(A+7) \
sfr1(A+8) sfr1(A+9) sfr1(A+10) sfr1(A+11) sfr1(A+12)
sfr1(A+13) sfr1(A+14) sfr1(A+15)
unsigned char SFR;
void getSFR(unsigned char addr)
{ switch (addr&0x7F)
{ sfr16(0x80) sfr16(0x90) sfr16(0xA0) sfr16(0xB0) sfr16(0xC0) sfr16(0xD0)
sfr16(0xE0) sfr16(0xF0) } }
Function returns value of SFR in global variable SFR.
Arnost
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