I don't know about that compiler but perhaps an int is only 8 bits, check
the warnings, it should mention something about an overflow. TTYL

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Harold M Hallikainen
> Sent: Tuesday, April 23, 2002 12:38
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Constants in Microchip C
>
>
>         I'm messing around with the Microchip C compiler and
> having trouble with
> defining some constants to initialize the UART. Taking the formula I use
> in assembly to set the BRG, I have tried the code below. I defined an
> integer "debug" so I
> could use a watch window to see what's going on.  Stepping past the first
> instruction (debug=ProcessorClock), it seems to work fine. debug ends up
> with 0x14. Stepping past the second instruction, debug ends up with 0x00.
>
>         What am I doing wrong? Since debug is an int, and an int
> is a signed 16
> bits, it seems that this should fit fine.
>         Any ideas appreciated!!!
>
> Thanks!
>
> Harold
>
>
>
> // PIC UART Baud Rate
> #define ProcessorClock 20;      // Processor clock speed in MHz
> #define BitRate 19200;          // bits per second
> int debug;                      // Something to watch as we debug
>
>
> void main(){
>   debug=ProcessorClock;
>   debug=19200;
>   IOinit();                     // Initialize I/O
>   putrsUSART("Hello World!\r\n");
>   CloseUSART();
>   }
>
> void IOinit(){
> // Initialize all I/O
>   // Init on chip usart based on constants ProcessorClock and BitRate
> OpenUSART(USART_TX_INT_OFF&USART_RX_INT_OFF&USART_ASYNCH_MODE&USART_EIGHT
> _BIT&USART_CONT_RX&USART_BRGH_HIGH, (ProcessorClock*15625/BitRate)-1);
> }
>
>
> FCC Rules Online at http://hallikainen.com/FccRules
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>
>
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