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rrb011270



Joined: 07 Sep 2003
Posts: 51

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Help on this...
PostPosted: Tue Sep 09, 2003 6:24 pm     Reply with quote
Mabuhay!

How can I input a hex to an eeprom? do i have to use the get_hex() function?

please provide me a sample code snippet.

thanx
Charlie U
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PostPosted: Tue Sep 09, 2003 9:36 pm     Reply with quote
:?:

Can you give us a clue as to what type of EEPROM you are interested in??

There are several types: first is internal EEPROM on your chip (which chip are you using?!?!), next is external EEPROM, and again what type; I2C serial or SPI serial?
Guest
PostPosted: Tue Sep 09, 2003 11:40 pm     Reply with quote
Charlie U wrote:
:?:

Can you give us a clue as to what type of EEPROM you are interested in??

There are several types: first is internal EEPROM on your chip (which chip are you using?!?!), next is external EEPROM, and again what type; I2C serial or SPI serial?


EEPROM type is 24LC256 or FM24C256
target chip: PIC18452
protocol: I2C

Thanx
ttelmah
Guest
Re: Help on this...
PostPosted: Wed Sep 10, 2003 8:08 am     Reply with quote
rrb011270 wrote:
Mabuhay!

How can I input a hex to an eeprom? do i have to use the get_hex() function?

please provide me a sample code snippet.

thanx

I think you need to get clear in your mind, what you actually want to do.
'Hex', is a way of representing numerical values, using conventional 'text' characters.
So, the number decimal '77', can be represented by the hex code '4D', but if stored into a single byte, displays as the ASCII character 'M'., and is held internally as the binary value '00101101'.
Now the EEPROM, stores numbers. If you have a value arriving in hex, and use the existing input functions to read this into a single byte, this byte can simply be stored to the EEPROM as a number (at this point, 'hex' doesn't come into it at all...). The code 'gethex', is a simple routine contained in one of the driver files, to convert an incoming ASCII 'hex' string, into it's numeric form. If you have a value arriving in text, and need to convert this to numeric, this is a good starting place, but has nothing to do with storing numbers in the EEPROM.
If you need to actually store an internal number, in hex, then the SPRINTF function, allows a value to be converted to the ASCII representation, and the resulting text string, could then be sent to the EEPROM, one character at a time.

Best Wishes
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