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memcopy problem

 
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karthickiw



Joined: 09 Aug 2007
Posts: 82
Location: TN, India

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memcopy problem
PostPosted: Sat Jun 20, 2009 8:59 am     Reply with quote
Dear CCS friends,

i use memcopy command for 128 x64 display program.. if try to copy 5 variable from Font2[] array into pixaldata[5] array. so that i use following code..

Code:
void glcd_text57(int8 x, int8 y, char textptr, int8 size, int1 color)
{
   unsigned char j, k, l, m;                       // Loop counters
   unsigned char pixelData[5];                     // Stores character data

 k=0;
memcpy(pixelData,FONT2[textptr[k]-'S'], 5);

   for ( j =0; j<5;j++)
    {
       printf("Font2[%u]=%X\n\r",j,pixelData[j]);
    }

}


Font2 array is

Code:
const int8 FONT2[44][5]={0x26, 0x49, 0x49, 0x49, 0x32, // S
                         0x01, 0x01, 0x7F, 0x01, 0x01, // T
                         0x3F, 0x40, 0x40, 0x40, 0x3F, // U
                         0x1F, 0x20, 0x40, 0x20, 0x1F, // V
                         0x7F, 0x20, 0x10, 0x20, 0x7F, // W
                         0x41, 0x22, 0x1C, 0x22, 0x41, // X
                         0x07, 0x08, 0x70, 0x08, 0x07, // Y
                         0x61, 0x51, 0x49, 0x45, 0x43, // Z
                         0x00, 0x7F, 0x41, 0x00, 0x00, // [
                         0x02, 0x04, 0x08, 0x10, 0x20, // \
                         0x00, 0x00, 0x41, 0x7F, 0x00, // ]
                         0x04, 0x02, 0x01, 0x02, 0x04, // ^
                         0x40, 0x40, 0x40, 0x40, 0x40, // _
                         0x00, 0x01, 0x02, 0x04, 0x00, // `
                         0x20, 0x54, 0x54, 0x54, 0x78, // a
                         0x7F, 0x44, 0x44, 0x44, 0x38, // b
                         0x38, 0x44, 0x44, 0x44, 0x44, // c
                         0x38, 0x44, 0x44, 0x44, 0x7F, // d
                         0x38, 0x54, 0x54, 0x54, 0x18, // e
                         0x04, 0x04, 0x7E, 0x05, 0x05, // f
                         0x08, 0x54, 0x54, 0x54, 0x3C, // g
                         0x7F, 0x08, 0x04, 0x04, 0x78, // h
                         0x00, 0x44, 0x7D, 0x40, 0x00, // i
                         0x20, 0x40, 0x44, 0x3D, 0x00, // j
                         0x7F, 0x10, 0x28, 0x44, 0x00, // k
                         0x00, 0x41, 0x7F, 0x40, 0x00, // l
                         0x7C, 0x04, 0x78, 0x04, 0x78, // m
                         0x7C, 0x08, 0x04, 0x04, 0x78, // n
                         0x38, 0x44, 0x44, 0x44, 0x38, // o
                         0x7C, 0x14, 0x14, 0x14, 0x08, // p
                         0x08, 0x14, 0x14, 0x14, 0x7C, // q
                         0x00, 0x7C, 0x08, 0x04, 0x04, // r
                         0x48, 0x54, 0x54, 0x54, 0x20, // s
                         0x04, 0x04, 0x3F, 0x44, 0x44, // t
                         0x3C, 0x40, 0x40, 0x20, 0x7C, // u
                         0x1C, 0x20, 0x40, 0x20, 0x1C, // v
                         0x3C, 0x40, 0x30, 0x40, 0x3C, // w
                         0x44, 0x28, 0x10, 0x28, 0x44, // x
                         0x0C, 0x50, 0x50, 0x50, 0x3C, // y
                         0x44, 0x64, 0x54, 0x4C, 0x44, // z
                         0x00, 0x08, 0x36, 0x41, 0x41, // {
                         0x00, 0x00, 0x7F, 0x00, 0x00, // |
                         0x41, 0x41, 0x36, 0x08, 0x00, // }
                         0x02, 0x01, 0x02, 0x04, 0x02};// ~



when exectu the code, my result is like below

Font2[0]=00
Font2[1]=00
Font2[2]=00
Font2[3]=00
Font2[4]=00

instant of

Font2[0]=26
Font2[1]=49
Font2[2]=49
Font2[3]=49
Font2[4]=32

i dont know what is problem with memcopy command..

i check below command

Code:
memcpy(pixelData,FONT2[0], 5);


its give correct answer...
Guest
PostPosted: Sat Jun 20, 2009 9:16 am     Reply with quote
Just wonder what this is?
Code:
FONT2[textptr[k]-'S']


textptr is a int8/char but you access it as an array?
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Sun Jun 21, 2009 2:07 am     Reply with quote
Yes, it isn't a memcopy problem. The code works when defining textptr correctly
Quote:
void glcd_text57(int8 x, int8 y, char *textptr, int8 size, int1 color)
karthickiw



Joined: 09 Aug 2007
Posts: 82
Location: TN, India

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thank you
PostPosted: Sun Jun 21, 2009 6:54 am     Reply with quote
FvM wrote:
Yes, it isn't a memcopy problem. The code works when defining textptr correctly
Quote:
void glcd_text57(int8 x, int8 y, char *textptr, int8 size, int1 color)


Thank you FvM. I finished my function using other method. Cool
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