> -----Original Message----- > On Behalf Of Cairns, Dustin > Sent: Monday, June 12, 2006 7:21 PM > To: [email protected] > Subject: [avr-libc-dev] USI to UART > > > > Has anyone used the USI as a UART based on the application note from > ATMEL AVR307? This app note uses the Tiny26 and I am trying to port > this to the Mega3250 but I cannot get it working. > > Thanks, Dustin
Hello Dustin, Not really a "avr-libc" question. I can't suggest a more applicable list but I'm sure someone else will. Anyway...I've followed this appnote to implement a UART using USI on a mega169 at 1MHz. I had to slightly modify the routines given in the appnote to suit my hardware. The 2nd "synthesised" UART was for a command interpreter. It was very flakey at 9600 baud; 1 in 3 command responses suffered corruption. Reception was OK but transmission was terrible. Interrupt latency was my problem. I had to reduce the baudrate to 2400 and modify the routines so as not to start transmitting until after the transmit buffer was filled. (Use the USI counter for this & reset it in the "Add chars to transmit buffer" routine. It is now quite reliable and my application can use it as if it were a real UART. Nigel
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