Do I have to remap I2C1 when the FSMC was used?

[jfong]

Posted on July 03, 2010 at 09:51

Do I have to remap I2C1 when the FSMC was used?

#afio-i2c1-fsmc

[daviddavid92]

Posted on May 17, 2011 at 13:57 Interesting. It looks like it's what is needed, I agree. I haven't tried it myself though.

[jfong]

Posted on May 17, 2011 at 13:57

Hi!

    I try to modify the register AFIO_MAPR2 but fails, it just keep on 0. I can modify other registers such as AFIO_MAPR or AFIO_EXTICRx but not this one. It seems there are some problem there.

[damh]

Posted on May 17, 2011 at 13:57

There is no register named AFIO_MAPR2 in STM32F1xx.

[jfong]

Posted on May 17, 2011 at 13:57

Hi! damh,

    Where you get this information? It didn't say so in RM0008. I am using the STM32F103ZE. Then which one has it?

[swhite2]

Posted on May 17, 2011 at 13:57

He got the information from exactly where he said. If you don't have

http://www.st.com/stonline/products/literature/rm/13902.pdf

then get it. Section 8.4.7 (page 178) 8.4.7 AF remap and debug I/O configuration register2 (AFIO_MAPR2) Address offset: 0x1C Reset value: 0x0000 0000 Bit 10 FSMC_NADV: NADV connect/disconnect This bit is set and cleared by software. It controls the use of the optional FSMC_NADV signal. 0: The NADV signal is connected to the output (default) 1: The NADV signal is not connected. The I/O pin can be used by another peripheral.

[epassoni950]

Posted on May 17, 2011 at 13:57

Hello,

Be carefull that description of register AFIO_MAPR2 was first in rev 11 of RM008 with new informations about STM32 with 768ko and 1Mo. In previous rev 10, there is no description of AFIO_MAPR2 even if there is already description of FSMC controler for high density devices (256ko and 512ko) I am not sure that AFIO_MAPR2 is present in medium density devices and so there is no method to disable NADV function. Regards Eric

[swhite2]

Posted on May 17, 2011 at 13:57

RM008 doesn't say that AFIO_MAPR2 is specific to the XL family but that doesn't mean it isn't. Interestingly the Standard Peripheral Library v3.3.0 defines AFIO_MAPR2 (in stm32f10x.h) but doesn't reference it at all.

[jfong]

Posted on May 17, 2011 at 13:57

Hi! StuartMW,

    The AFIO_MAPR2 has been referenced at function GPIO_PinRemapConfig in v3.3.0, but in a strange way. I doubt it will work.

[damh]

Posted on May 17, 2011 at 13:57

@

Ok, new reference manual says that there is a register with this name. But in STMs interpretation of using words, it means something like there could be a register with this name ;) Fact is, there were STMs without that register. New manual doesn't say, which conditions must be met to have this register.