Driver SPIM receive - problem with CS

[tommasopolonelli]

I may have found an important bug in spim_receive.
With the following code:

I would expect that the CS stays low after the first function call, as described in :

Indeed, the signal generated is the following (yellow: CLK, blue: CS):

[tommasopolonelli]

A simple fix can be used to solve the problem:

edit this file: runtime/pulp-rt/drivers/spim/spim-v2.c

in function __rt_spim_receive replace the line:
rt_periph_dual_copy(copy, handle->channel, (unsigned int)cmd, 4*4, (int)data, (len+7)>>3, 2<<1, call_event);
with
rt_periph_dual_copy(copy, handle->channel, (unsigned int)cmd, cs_mode == RT_SPIM_CS_AUTO ? 4*4 : 3*4, (int)data, (len+7)>>3, 2<<1, call_event);

Then recompile with this command:
plpbuild --m pulp-rt build --stdout

[haugoug]

This has been pushed and will be in the next tag.