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I already have an alternative solution based on a pair of OS_SEM that explicitly blocks/unblocks the threads to alternate between them. Again, to be clear, no spacing out of DACout calls was necessary in 1.6, no delays, no explicit blocking/unblocking. All that was needed was a critical section ...

Yes I understand that an unblocked higher priority thread will immediately be scheduled and run, preempting any lower priority thread.

Perhaps the code outline was a little too brief, DACout's critical section is inside a for loop. Actually there are two for loops, one for the rising edge and one ...

Randy is about to get on a plane for vacation. So naturally this is when problems are found. :-)

I'm working with Randy and I'll fill in. Be warned, I am new to NetBurner and µC/OS. NDK 2.9.5 is my starting point. Randy and I both have MOD54415, his is revision 1.something I believe, mine 2.2.

The ...

The conversion of old code seems to be unnecessary. Implementation (ucos.h) calls class members.

inline BYTE OSCritInit( OS_CRIT *pCrit ) { return pCrit->Init(); }
inline BYTE OSCritEnter( OS_CRIT *pCrit, WORD timeout ) { return pCrit->Enter(timeout); }
inline BYTE OSCritLeave( OS_CRIT *pCrit ...

I converted

OS_CRIT i2cCS;
OSCritInit( &i2cCS );
OSCritEnter( &i2cCS, 0 );
OSCritLeave( &i2cCS );

to

OS_CRIT i2cCS;
i2cCS.Init();
i2cCS.Enter( WAIT_FOREVER );
i2cCS.Leave();

Still doesn't work. Using 2.9.5.

Both compile and run, they just fail differently. Only one thread runs in the old ...