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nina



Joined: 20 Apr 2007
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nibble
PostPosted: Sun Jul 04, 2010 9:14 pm     Reply with quote
humberto

00010011 & 0x0F (11110000) result 00010000 (16 dec).

Could you explain this math?

tks

nina
Humberto



Joined: 08 Sep 2003
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PostPosted: Mon Jul 05, 2010 9:29 am     Reply with quote
Quote:

I am not using 7445. Display one and display two are conected directly to pic. How can I display those numbers?

Use this table assignment to drive each segment of the display directly from the PIC:
Code:
//          character         0    1    2    3    4    5    6    7    8    9
byte const Digit_Map[10] = {0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xE6};

Wire the MSB of the selected port (Ex PortB: B7 to segment a, B6: seg b, B5: seg c ... B1:seg g)

Quote:

00010011 & 0x0F (11110000) result 00010000 (16 dec).
Could you explain this math?

I never post what you remark.

Binary 0b11110000 is equal to HEX 0xF0 NOT 0x0F as you post.

x = 0x13 & 0xF0 // in HEX
x = 0b000100011 & 0b11110000 // in Binary

AND two binary values
0b00010011 // 0x13
0b11110000 // 0xF0
____________
0b00010000 // 0x10

Please use MPLAB to test and simulate all this math.

Humberto

Last edited by Humberto on Mon Jul 05, 2010 10:33 am; edited 1 time in total
nina



Joined: 20 Apr 2007
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nibble
PostPosted: Mon Jul 05, 2010 10:18 am     Reply with quote
humberto

binary 0b00010000 is not 16 in dec? This point I can not understand.


bin dec hex
0000 0001 01 01
0001 0000 16 10

Tks

nina
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Mon Jul 05, 2010 10:54 am     Reply with quote
0b000100000 YES it is equal to decimal 16.

I showed you how to handle a binary number >100 using a single algoritm to convert it to BCD
in two nibbles. These two nibbles does not have any mathematical equivalent to any Decimal number,
just is a BCD value that can not be used for any math. I guess that this is what you do not figure out.
Once converted a binary value, the resulting value to drive a display segments, like 0b000100000
does not matter if is equal to a decimal number, it´s just a value that will do what you need.

Humberto
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