topic Re: Middle state on I2C in Kinetis Microcontrollers

Middle state on I2C

gaelsieber — Mon, 17 Jun 2013 11:55:06 GMT

Hi,

In first, I apologize for my english, i'm not very good :smileyhappy:

I work on a K10 and i would like use I2C to communicate with an RTC (rv-3029)

When i write on the bus, it's works perfectly. But, when the RTC send à ACK or a Data, it result an middle state (like the pictures)

it's seems good, except this half state

I try to configure the Open drain on the port, but the flag busy is always set after that.

PORTB_PCR0 = 0|(PORT_PCR_MUX(0x2));

PORTB_PCR1 = 0|PORT_PCR_DSE_MASK|(PORT_PCR_MUX(0x2));

Thx for reply

Re: Middle state on I2C

dieterteuchert — Mon, 17 Jun 2013 14:09:25 GMT

Since the I2C SDA is a digital pin function, you need to make it open drain using the ODE bit in the pin configuration register. I wrote a note two weeks ago, please look for "Kinetis I2C ODE".

Re: Middle state on I2C

gaelsieber — Tue, 18 Jun 2013 08:14:39 GMT

Thanks for reply

i've read your note and i succeed to correct my code, I had a problem with the pin configuration AND with my i2c sequence but it's corrected now.