Writing 2 bytes to EEPROM

[wuchy143]

Hi,

I need to write a 2 byte number to Esquared. For example I'm able to write the first 8 bits but am confused on how to write the first 8 bits and also tell the microcontroller to write the more significant byte as well. I"m using the PIC12F675 using HIgh Tech C lite. Any thoughts?

Thanks

-mike

 

[birdman0_o]

Do you mean I2C instead of Esquared?

 

[wuchy143]

Nope. I'm referring to the 128bytes of EEPROM available on the PIC12F675

 

[birdman0_o]

Just write the lower byte, then shift your number over to the right 8 times then write that.

 

[wuchy143]

lol. Thanks. Sometimes I feel like a box of hammers

 

[wuchy143]

birdman,

I got this to work fine. Though, when I try and read it back from the EEPROM I do it the same way that I wrote it but this is what happens. So I read in the most significant byte. Shift it over 8 times in my 16 bit variable "hour". Then i read the lower byte from EEPROM set that equal to hour but that clears hour to just the lower byte and blows away the upper byte. hmmmm

 

[wuchy143]

Figured it out. I just add what's in the EEDATA register and what's already in hour after I read the least significant byte. Works great now

 

[birdman0_o]

be careful about shifting the carry

 

[wuchy143]

Thx.

I checked out your webpage. you got some pretty cool projects up there. Do you do everything in assembly?

 

[birdman0_o]

Yes, I do love my op codes ever so much! I've learned C and Java at school and C# on my own as well as assembly. Assembly is what I started with, but I love it's simplicity and it's always a challenge so I always code with it