18F26K22 with spi and I2c

cwedgwood · Joined: 16 Mar 2012 Posts: 12

Does anyone have working code for this chip with both spi and I2C working?

My config is spi_2 and I2c on 1.

It seem to hang on any write to the I2C.

Thanks for any help.

Chris

temtronic · Posted: Mon Mar 26, 2012 9:15 am

Show us your code! A small,compilable program that has the problem.
also include compiler version and what value the I2C pullups re and bus speed.
We need more information to help you.

cwedgwood · Joined: 16 Mar 2012 Posts: 12

Thanks,

No pullups, i'm using NOFLOAT_HIGH instead.

temtronic · Posted: Mon Mar 26, 2012 9:41 am

I2C devices need the correct pullups, it's in the specs

Ttelmah · Joined: 11 Mar 2010 Posts: 19504

Seriously get rid of this, and add resistors.
NOFLOAT_HIGH, can _only_ be used with slave devices that do not use NACK to mark the last transfer. It is _not_ compatible with normal I2C operation.

Best Wishes

cwedgwood · Joined: 16 Mar 2012 Posts: 12

Thanks, but would this cause the code to hang?

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

cwedgwood · Joined: 16 Mar 2012 Posts: 12

Thanks PCM, problem all fixed now.