Re: [avr-gcc-list] SOLVED: Help setting up USART on ATmega32 in C

[Rick Mann]

I was pretty stupid. I didn't realize that the 4 MHz crystal wasn't 
being used; that I'd forgotten to change the clock source from the 1MHz 
internal osc to the crystal; so my baud rate calculations were off.

Thanks to all who helped.

On Feb 13, 2004, at 11:54 PM, Jack Valmadre wrote:

> The ATmega32 datasheet contains C code to send and receive using USART.
> Try using them.
> Jack
>
>
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf Of Rick Mann
> Sent: Saturday, 14 February 2004 12:38 PM
> To: address@hidden
> Subject: [avr-gcc-list] Help setting up USART on ATmega32 in C
>
> Hi. Sorry if this really isn't the right place for this question.
>
> I'm trying to set up the USART on an ATmega32 (4.000 MHz) in C, with
> the following code:
>
> void
> sendMMCByte(char inByte)
> {
>         while (!(UCSRA & _BV(UDRE)));
>         
>         UDR = inByte;
> }
>
>
> int
> main (void)
> {
>         UBRRH = 0;                              //      Set baud rate of
> 38400
>         UBRRL = 6;
>         UCSRA = 0;
>         UCSRB = _BV(TXEN);              //      Enable the transmitter
>         UCSRC = _BV(URSEL) | _BV(UCSZ1) | _BV(UCSZ0);
>         
>         sendMMCByte(0xd0);
>         sendMMCByte(0x01);
>         sendMMCByte(0x04);
>         sendMMCByte(0xfe);
>         sendMMCByte(0x00);
>         sendMMCByte(0x02);
>         sendMMCByte(0x00);
>         sendMMCByte(0xd5);
> }
>
>
> Although I see a pulse train on the oscilloscope, I'm not sure the bit
> rate is correct. I've also tried using the speed doubling feature with
> a value of 12.
>
> Any ideas?
>
> Thanks!
>
> --
> Rick
>
>
> --
> "A facility for quotation covers the absence of original thought."
>                                                 --Lord Peter Wimsey
>
>
> _______________________________________________
> avr-gcc-list mailing list
> address@hidden
> http://www.avr1.org/mailman/listinfo/avr-gcc-list
--
"A facility for quotation covers the absence of original thought."
                                               --Lord Peter Wimsey