Spartan-6 LX150T Development Kit

[heedaf]

Can anyone tell me how to reset bit 2 (BB - Bus Busy) in the CR register (I2C core) when a stop condition doesn't occur? I would like the configuration untouched so I don't have to re-initialize the core.

[npoureh]

BB is in Status Register (SR), which is a Read only register.

[heedaf]

Correct, but how do I reset the core to clear the BB?

[npoureh]

Writre to the SOFTR register (this is documented in the I2C core datasheet).

[heedaf]

I read about that but I wasn't sure if the core needed to re-initialized.  Do you know?  I looked through the .c .h files and I couldn't find anything on how to write to the SOFTR register.  Can you point me in the right direction on how to do this?

[npoureh]

According to the datasheet, the SOFTR register offset is 0x040, so simply do a memory write to the (I2C BASEADDR)+0x040.

[heedaf]

Thank you.  Do you know if it clears the core initialization?

[npoureh]

It forces all core registers to their default values (you can take a look at the default values in the datasheet).

[heedaf]

Bummer!  I was hoping to avoid that.  Thanks for you help.