5775B flexCan_A failed to start (when MDIS is set to 0)

[wxf]

dear all,

When I debug online, after I configure FlexCan_A, I set FRZ=0, HALT=0, MDIS=1 in MCR. Then I want to start CAN by setting MDIS=0, but at this time FRZ and HALT are automatically set to 1. .

Why does this problem occur, can you give me some suggestions

thank you

XiufengWang

[PetrS · Accepted solution]

Hi,

this could be caused by FlexCAN's ECC mechanism, which is by default enabled and in case of non-correctable error module is put into a Freeze mode (see ECCDIS and NCFEFAFRZ bits of MECR register).
So it depends on your initialization, try to disable ECC at all and see if you see this still.

BR, Petr