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Hi!

I don�t know if this is a common problem with LCD-displays, but mine is dead Laughing

. On startup It only shows one line with black squares and then nothing happens. I�ve tried my code on a LAB- ...

HARDWARE:
Nothing special, just a PIC16F877A with four (five with reset) user-buttons attached to B0,B1,B2 & B4. I also have an i2c-connection with another PIC...but that shouldn�t have anything ...

...and it doesn�t make any difference.
Please continue to share your thoughts!

Cheers!
/David

Yes I have a parallel resonant crystal.
I tried setting the HS-fuse but it doesn�t help.
All components are placed on a contact-deck and connected to each other with cables.
The PIC is capable of r ...

Hi there!

I trying to connect a 20 MHz crystal (http://www.elfa.se/elfa-bin/dyndok.pl?lang=se&vat=0&dok=2013473.htm) to a PIC16F877A-processor, but I can�t get it to start. Both the process ...

...I managed to get an acknowledge for the address-byte. I don�t know why, but it started working when I juggled with the cable that�s connected to the ICP-programmer. I suspect that there�s something ...

Hi!

Below you can see the source-code for a i2c-test-program. I�m sending two bytes of data from one master to a slave. My problem is that I don�t get an acknowledge for the first data-byte that I� ...

...I inserted it after I posted the message on this forum. But the problem still remained....

...so once again you�ve made a pretty good point. Since the SLAVE does�t ACK the address-write (which is the same as the test-write), the i2c_write()-function returns TRUE=1 and sends the two data-byt ...

...but as I said, right now I�m using the address 0x6C. This seems like a quite "normal" address, right? And the GCEN-bit is cleared right now...

If I�ve understood everything, the hardware will au ...

ok, good point......but still, the fact remains that the slave-PIC doesn�t even enter the ISR.... I tried putting the i2c_read()-function in the enternal while-loop in the main-program, but that did ...

Hi again!

Changed to address 0x6C and the slave still doesn�t pull down to data-connection (ACK)....and yes, I�ve modeled the slave code after the "ex_slave.c" code-example...

/David

...I forgot the endless loop. But it doesn�t make any difference. There�s still no ack from the slave...

The adress that I send is not 0x51, but 0x00. 0x51 is the first byte that I�m sending...

Hi!

I�m using the code below to send two bytes of data from one master-PIC to a slave-PIC. As you might have guessed...it doesn�t work. When I measure the signal with an oscilloscope I can see that ...