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Pic24 int8 int16 int32 problem

 
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pieter



Joined: 16 Jan 2011
Posts: 27

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Pic24 int8 int16 int32 problem
PostPosted: Thu Apr 07, 2011 8:15 am     Reply with quote
Hi all,
Using PCD 4.118
problem is persistent
when i transfer data from int8 to int16, the msw result bits are set
same problem with int16 to int32
Code below simplified to illustrate the problem

Code:

int32 address;
int16 HighAddr;
int16 LowAddr;
int32 Rcxx;

   HighAddr=0x0003;
   LowAddr=0x8230;


   HighAddr&=0x0007;          // int16
   address=HighAddr;      // load int32 with int16
   address <<= 16;      // shift ls16 to ms16 in int32
   address += LowAddr;      // add ls16 to ls32


   Rcxx=address;
   printf(lcd_putc, "Addr=%LX",Rcxx);   // the result = 0xFFFF8230
                                 // should be    0x00038230


or

Code:

int8   Ral:
int16   Raa:

   Ral=0x84;
   Raa=0x0000;
   Raa+=Ral;          // Raa = 0xFF84 instead of 0x0084



Any ideas?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Apr 07, 2011 10:07 am     Reply with quote
Unlike PCB, PCM, and PCH, the data types in PCD are 'signed' by default.
This is in the PCD manual, this section:
Quote:
Data Definitions / Basic and Special Types

http://www.ccsinfo.com/downloads/PCDReferenceManual.pdf
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