I2c problem - rcen does not generate clock

electroRF

Member

• Oct 8, 2013

• #21

Hi Ian,
Could you please try this:

https://imageshack.us/photo/my-images/199/yx0n.jpg/

 

Last edited: Oct 8, 2013

electroRF

Member

• Oct 8, 2013

• #22

I also added the following Step: Reading the Byte from the Slave.
As you can see, the Master Generates 8 pulses, but the SDA remains Zero during these 8 pulses, and it goes up only after the 8th pulse is over.

**broken link removed**
**broken link removed**

Do you have an explanation for that?

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Oct 8, 2013

• #23

I know this is crazy but what value are you expecting..... What if the value to read IS zero???

 

electroRF

Member

• Oct 8, 2013

• #24

Hi Ian,

The value for sure is not Zero,

I wrote a cursor value - 0x15.
Then read Zero
Then wrote Text to the GLCD, and I saw it has an offset due to the 0x15 (by default it'd start at 0x00).

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Oct 8, 2013

• #25

Okay... So we know it is responding.. we need to find out what address to use... Have you tried 0x8C as a read command?

 

electroRF

Member

• Oct 8, 2013

• #26

Hi Ian,
Thank you.

Yes,
I tried 0x8C for both Write and Read (instead of just for Write).
it didn't work.
I also tried 0x00 and 0x01 (global address) for READ command, but it didn't work also.