Hi i have got code for an assembler software UART in c51. normally putchar() is of type unsigned char but with the assembler code how do i do this?
void putc() { #pragma asm * Transmit character in A via TXD line * putc CLR TXD Drop line for start bit MOV R0,#BITTIM Wait full bit-time DJNZ R0,* For START bit MOV R1,#8 Send 8 bits putc1 RRC A Move next bit into carry MOV TXD,C Write next bit MOV R0,#BITTIM Wait full bit-time DJNZ R0,* For DATA bit DJNZ R1,putc1 write 8 bits SETB TXD Set line high RRC A Restore ACC contents MOV R0,#BITTIM Wait full bit-time DJNZ R0,* For STOP bit RET * #pragma endasm }
my UARTS have failed....granted my fault most probably but im learning.
What does that mean? that when your code does not work, instead of fixing it, you try another approach?
That, dear friend, is the road to abject failure.
Erik