Confusing bug

hi everyone,

i'm hardware designer, project i'm working on @ work requires me write software. i've got small snippit of code not working, , have no idea why.

code: [select]

  if (receivedchars[7] != 66 || receivedchars[7] != 68)     //66 = change disp, 68 = change brightness
  {
    serial.print("invalid command");
    serial.print('\n');
    serial.write(receivedchars[7]);
  }
  else

when run code, get;

code: [select]

invalid command
66

"invalid command" not appear anywhere else in code, must entering if statement. however, if entering if, receivedchars[7] couldn't 66, is.

does have idea might going on?

thank you!

i'm using hterm input , output data on usb arduino

quote from: ace1719 on jan 15, 2017, 12:05 am

however, if entering if, receivedchars[7] couldn't 66, is.

consider logic:

code: [select]

if (receivedchars[7] != 66 || receivedchars[7] != 68)
since receivedchars[7] can never 66 , 68 simultaneously true. think meant:

code: [select]

if (receivedchars[7] != 66 && receivedchars[7] != 68)

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