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Content preview: Dear All, i've had some trouble debugging my TinyOS 2.1.1
application today. I've had some code that essentially was the same as:
uint8_t
a = 5; [...]
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--- Begin Message ---
Dear All,
i've had some trouble debugging my TinyOS 2.1.1 application today. I've had
some code that essentially was the same as:
uint8_t a = 5;
what struck me, was that the following returned FALSE:
(~a == (255-a))
{ Note:
b00000101 = 5
b11111010 = ~5 = 250 = (255-5)
}
Did i miss something or is this a (un-)known problem?
I ended up using (255-b) instead of ~b.
regards,
Bruno Juchli
PS: this is an excerpt from the actual code:
uint8_t rxLength;
async event void UartStream.receivedByte( uint8_t byte ) {
(...)
case STATE_WAIT_FOR_LEN:
rxLength = byte;
mReceiveState = STATE_WAIT_FOR_NLEN;
break;
case STATE_WAIT_FOR_NLEN:
//if (byte == ~rxLength) { //not working
if ((255-byte) == rxLength) { //working just
fine
mReceiveState = STATE_WAIT_FOR_MESSAGE;
rxBytesToRead = rxLength + 4; //+
address + contentType + CRC16
messageBuffer[0] = rxLength;
rxBufferBegin = 1;
} else {
mReceiveState = STATE_WAIT_FOR_ALERT;
}
break;
(...)
}
________________________________________
Bruno Juchli
University of Applied Sciences Lucerne, Switzerland
--- End Message ---
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