How can I set and retrieve bitwise in uVision C? Similar to assembler P1.0 addresses Bit0 in Port P0. I could not find any possiblility to do so unless I take the usual Bitaddressing techniques (masking and shifting) Please answer to andreas.alef@web.de Regards, A. Alef
sfr P0 = 0x80; sbit P0_0 = P0^0;
"Not sure if there's a way to access it as P0.0 or not." Not in C51. Note that it would generally be better to give the bit a more meaningful name than just "P0_0" - make it reflect the function of that bit; eg, door_open or tank_full
Note that it would generally be better to give the bit a more meaningful name than just "P0_0" - make it reflect the function of that bit; eg, door_open or tank_full Agreed. I was just reflecting the name he chose.
Robert, I dont't understand that. sbit P0_0 = P0^0; With P0 I identify Port 0 as ist ist defined in <reg515c.h>. Ok: I want to set Bit 0. So that is for the name I chose. If I want to set Bit0 I can do it in C like P0 = 0x01; or if I want to let the other 7 Bits as they are: P0 = ( P0 | 0x01 ); in Assembler it would be much easier: P0.0 = 1 I understand your code obviously that I can set and address one bit in P0 with ^ (that is in my opinion exclusive or). If I want to set Bit0 of P0, I can take P0_0 = 1; or P0 = P0 ^ 1; // for the 0th bit P0 = P0 ^ 5; // for the 4th bit ???
As with any other variable in 'C', you have to define the bit variable first; only then you can you use it
sbit P0_0 = P0^0;
Andrew and the others: I finally got it. Thanks from DE!