PB7, FSMC and I2C

smuraski · ‎2009-09-24

Posted on September 24, 2009 at 18:19

PB7, FSMC and I2C

smuraski · ‎2011-05-17

Posted on May 17, 2011 at 13:23

Is it possible to utilize I2C.SDA at the same time as the FSMC on PB7...I do not need the FSMC.nADV signal, but apparently whenever the FSMC is active it takes ownership of pin PB7 thereby disabling the functionality of the I2C.SDA signal???

After reading many other messages...if the FSMC is non-muxed nor mode the nADV signal is not used...Does this mean that there will be no interference with the I2C.sda without having to turn off the FSMC clock?

[ This message was edited by: smuraski on 12-09-2009 18:23 ]

guyvo67 · ‎2011-05-17

Posted on May 17, 2011 at 13:23

smuraski,

I have actually no idea if it's possible to use that pin for that double function (SDA/FSMC) but it's seems logic to me that two functions on the same pin isn't a good design anyway.

Therefore you better can remap I2C1 to PB8/9. Or use I2C2 on PB10/11.

-G

tomas23 · ‎2011-05-17

Posted on May 17, 2011 at 13:23

No hope, nADV is overriding the signal from I2C in the AFIO unit. Please remap I2C pins if possible.