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hi all can the USART of PIC 18f252 transmit only signed char or does it even transmit unsigned char. i am checking the serial communication by sending a few HEX values through the PIC through a MAX232 to my PC,but when i send hex values above 0x80 ie(128 d) i donot get the desired byte on my PC. waiting for an reply anxiously krishna -------------------------------- mail2web - Check your email from the web at http://mail2web.com/ . |
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pic18f252 usart char
Started by ●December 29, 2003
Reply by ●December 29, 20032003-12-29
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Check to make sure you are using 8-bit no
parity settings on the USART of both the PC and PIC. I can't speak
for the 18F252, as I've not used it, but the pic's I've used will
do 8-bit no parity just fine. If you are using 7-bit with parity, then you
can't do unsigned chars as they won't fit in 7 bits, and the USART
will chop off the 8th bit and replace it with the parity bit.
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Reply by ●December 29, 20032003-12-29
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also, check the pc side of things. some serial I/O libraries whack the 8th bit. there is nothing in the PIC USART that precludes 8 bit I/O. --- In , "Bert Drake" <Bert@D...> wrote: > Check to make sure you are using 8-bit no parity settings on the USART of both the PC and PIC. I can't speak for the 18F252, as I've not used it, but the pic's I've used will do 8-bit no parity just fine. If you are using 7-bit with parity, then you can't do unsigned chars as they won't fit in 7 bits, and the USART will chop off the 8th bit and replace it with the parity bit. > ----- Original Message ----- > From: krishnap@m... > To: > Sent: Monday, December 29, 2003 1:37 PM > Subject: [piclist] pic18f252 usart char > hi all > can the USART of PIC 18f252 transmit only signed char or does it even > transmit unsigned char. > i am checking the serial communication by sending a few HEX values through > the PIC through a MAX232 to my PC,but when i send hex values above 0x80 > ie(128 d) i donot get the desired byte on my PC. > waiting for an reply anxiously > > krishna > > ------------------------------ -- > mail2web - Check your email from the web at > http://mail2web.com/ . > > > to unsubscribe, go to http://www.yahoogroups.com and follow the instructions > > > -------------------------------- ---------- > Yahoo! Groups Links > > a.. To |
