Re: [avr-gcc-list] Small program for UART not working

[Jonathan Goldberg]

Gary Bi wrote:

> > From the scope, I can calculate the baud rate rough
> number, for example, if setting it to 9600 in MCU, on
> scope, it was around that range; setting to 57600, the
> reading from scope will be around 57600, etc. But I
> don't know the exacly reading, since there's no way to
> read it, I can only Icalculate it though the measure of
> waveform frequency. I also noticed the start bit
> (1bit) and stop bit (bit) is correctly set in the
> waveform.
>
> Thanks,
> Gary
>
>
> --- Gary Bi <address@hidden> wrote:
>  
If measuring baud rate with an o'scope, you can transmit a 0xAA 
character and measure the time delta between a rising edge and the next 
falling edge.  This should give you the bit time.  Taking the inverse of 
the bit time will give you an accurate baud rate.

Jonathan