AVR-Chat

You will need to the I/O library
#include <stdio.h>

You will need to link printf to the USART
fdevopen((void*) Usart_Tx, (void*) Usart_Rx);

You will then need to provide the low level "get a byte to/from the USART
routines (called Usart_Tx and Usart_Rx above)

You will also need to init the USART to the correct baud rate.

You might want to get a copy of the AVR Butterfly demo program that was 
ported to WinAVR and look at UART.h and UART.c for examples of Usart_TX, 
Usart_Rx, and the USART init routine.

After that code like

unsigned char a = 0xA;
printf("\r\nThe value of a = %d", a);

will cause printf to produce the string "\r\nThe value of a = 10" and send 
the string one character at a time to the low level routine Usart_Tx which 
is responsible for sending the characters to the USART.  An example of a 
polled Usart_Tx routine is

void Usart_Tx(char data)
{
    while (!(UCSRA & (1<<UDRE)));  // Wait for the USART to become ready
    UDR = data;                                   // Put the character into 
the Usart
}

-Mike



----- Original Message ----- 
From: "Mike" <k5atm@comcast.net>
To: <AVR-Chat@yahoogroups.com>
Sent: Wednesday, January 23, 2008 6:50 PM
Subject: Re: [AVR-Chat] Simple casting winavr


> You will need to the I/O library
> #include <stdio.h>
>
> You will need to link printf to the USART
> fdevopen((void*) Usart_Tx, (void*) Usart_Rx);
>
> You will then need to provide the low level "get a byte to/from the USART
> routines (called Usart_Tx and Usart_Rx above)
>
> You will also need to init the USART to the correct baud rate.
>
>
> You might want to get a copy of the AVR Butterfly demo program that was
> ported to WinAVR and look at UART.h and UART.c for examples of Usart_TX,
> Usart_Rx, and the USART init routine.
>
>
> -Mike
>
>
>
>
> ----- Original Message ----- 
> From: "Bryan Martin" <registration@myplaceinspace.com>
> To: <AVR-Chat@yahoogroups.com>
> Sent: Wednesday, January 23, 2008 6:04 PM
> Subject: [AVR-Chat] Simple casting winavr
>
>
>>I am attempting to move to C (winavr) from bascom for programming but
>> getting hung up on some fundamentals.
>>
>> Given the following
>>
>> unsigned char byte_in = 0xA;
>>
>> I need to print the decimal value to UART so I want to see 10.  Similar 
>> to
>> printf("%d", byte_in).  Lord I hope this makes sense.
>>
>> Poor planning on your part does not constitute an emergency on my part.
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>
>
>
>
> Yahoo! Groups Links
>
>
>