SPI_MISO pull down (P5)

Question

Hello,

I try to put the atcmd P5 (=SPI_MISO) at "4" (i.e. pull down) status before entering cyclic sleep mode (because I have a LED connected to this I/O that I would like to turn OFF during sleep)

But as soon as the cyclic sleep is activated, the led blinks a little bit, as if the associated I/O was in high-Z (or disabled) mode, and not in pull down.

This is the only one I/O which I am not able to control before entering sleep mode...

Any help?

Thanks

Answer 1

Hello,

This question can be closed. It was due to a bug in the xbee firmware that has been corrected in version 100B. In the changelog, the corresponding line is the following :

==> Fixed issue when P5 - P9 are set as digital outputs were being pulled up instead of driven high or low
during sleep.[XBHAWK-524]

After firmware update, everything is OK.

Maybe this topic will help some other users...

Regards,

Sam

Answer 2

You are probably inadvertently forcing SPI mode. Try using one of the other pins for this function.