Lpc2000

I thought vectors are DWords and not Bytes?

--- In lpc2000@yahoogroups.com, "carlosahsilva" <carlosahsilva@t...> 
wrote:
>
> I have made some tests on the Program CheckSum generated by IAR 
> compiler and there is realy something fish.
> 
> First I edited the segmentation to place the CheckSum as first 
byte 
> after the end of my code:
> -------------------------------------------------------------------
-- 
> ?CHECKSUM   CHECKSUM          __checksum       00037FFF  
> Program     Relative 
> module      segment 
>             00037FFF - 
>             00037FFF
>             Segment part 1. 
>             ROOT.  
> -------------------------------------------------------------------
-
> 
> The IAR compiler informed me the value and calculation range
> -------------------------------------------------------------------
---
> Checksums
> 
> Symbol      Checksum  Memory  Start      End 
> __checksum  0xcc      CODE    00000000 - 00037FFE 
> 
> -------------------------------------------------------------------
----
> 
> I selected the simple checksum (not any CRC) and wrote the code 
below 
> to test it
> 
> /*-----------------------------------------------------------------
> CheckSum calculation routine
> -----------------------------------------------------------------*/
> void CalcCheckSum(void)
> {
>    unsigned char *pby;
>    unsigned char *pCksGen;
>    unsigned char CksGen;
>    char STRCksCalc[] = "AAAAAAAAAAAAAAAAA";
>    char STRCksGen[] = "AAAAAAAAAAAAAAAA";
> 
>    // Indicate start of the calculation
>    UART_PutStringByPolling (UART0, "\n\rCalculation 
Start.\n\r"); /**/
>    UART_PutStringByPolling (UART0, "\n\r\n\r");
> 
>    // Point to Address 0x00000000
>    pby = (unsigned char *)0x00000000;
>    // Start the Sum with zero
>    unsigned char ValCheckSum = 0;	
>    // Sum all bytes between 0x00000000 and 0x00037FFF.
>    for (long byte = 0; byte < 0x00037FFF-0x00000000; byte++) {
>      // Read a byte and sum it
>      ValCheckSum += *pby;
>      // Increment pointer
>      pby++;
>    }
> 
>    // Indicates the end of the calculation
>    UART_PutStringByPolling (UART0, "\n\rCalculation 
End.\n\r"); /**/
> 
>    // Get the value of the CheckSum stored in the firmware
>    pCksGen = (unsigned char *)0x00037FFF;
>    CksGen = *pCksGen;
> 
>    // Transform both values in string
>    sprintf (STRCksCalc, "%x", ValCheckSum);
>    sprintf (STRCksGen, "%x", CksGen);
>    // Send the Vavlues by the serial
>    UART_PutStringByPolling (UART0, "\n\r\n\r");
>    UART_PutStringByPolling(UART0, STRCksCalc);
>    UART_PutStringByPolling (UART0, "\n\r\n\r");
>    UART_PutStringByPolling(UART0, STRCksGen);
>    UART_PutStringByPolling (UART0, "\n\r\n\r");
> }
> 
> How ever when I runned the code the genarate value and calculated 
> values are different:
> 
> ==============================================================
> Calculation Start.
> 
> Calculation End.
> 
> 22 - Calculated
> cc - Generated by the compiler
> ===============================================================
> 
> Does any one call tell me what I do wrong or provide me a sample?
> 
> Thanks
>