PIC16F84 Clock Character table

[Pappee]

Hi All!

I found a schematic and a source code here:**broken link removed**.It is a propeller clock. It includes a asm, and the author had defined the following character table:

ignore high bit. set=LED off, clear=LED on, bit0=bottom LED, bit6=top LED

Char_tbl
		addwf	PCL,f
		dt	0xC1,0xBE,0xBE,0xBE,0xC1	;"O"
		dt	0xFF,0xDE,0x80,0xFE,0xFF	;"1"
		dt	0xDE,0xBC,0xBA,0xB6,0xCE	;"2"
		dt	0xBD,0xBE,0xAE,0x96,0xB9	;"3"
		dt	0xF3,0xEB,0xDB,0x80,0xFB	;"4"
		dt	0x8D,0xAE,0xAE,0xAE,0xB1	;"5"
		dt	0xE1,0xD6,0xB6,0xB6,0xF9	;"6"
		dt	0xBF,0xB8,0xB7,0xAF,0x9F	;"7"
		dt	0xC9,0xB6,0xB6,0xB6,0xC9	;"8"
		dt	0xCF,0xB6,0xB6,0xB5,0xC3	;"9"
		dt	0xFF,0xC9,0xC9,0xFF,0xFF	;":"

I would like to write a sort word : "GABOR",and the defined numbers doesn't fit me. Could someone tell me how "makes" for example: 0xC1,0xBE,0xBE,0xBE,0xC1 = 0 ?? And so one?And how can I define a,b,c....?

Thanx a lot:

 

[Nigel Goodwin]

Presumably it's the binary bit patterns used to display each number, you would need to design the binary bit patterns for any characters you wanted. Looking at the example for the ':' it seems obvious that the table is inverted, each '0' in the bit pattern signifies a lit LED.

 

[Pommie]

If you convert the hex numbers in the table into binary you end up with a bit pattern.

I.E. For character 5

dt   0x8D,0xAE,0xAE,0xAE,0xB1   ;"5"

0x8D = 10001101
0xAE = 10101110
0xAE = 10101110
0xAE = 10101110
0xB1 = 10110001

If you look at the zeroes then you will see that it is a 5 on it’s side backward. You now just need to work out the bit pattern for the alphabet :lol: . Actually, if you look around you should find a 7*5 character set somewhere on the web.

Mike.