1.
QE may halt if it's clocks frequencies are out of range. Please check QE PLL and VCO frequency (and also frequencies of serial interfaces) .
2.
QE may halt because of bus error (before init_tx_rx command or as the result of this command). Check SDMA Status register SDSR. If error is set, check SDTA1/SDTA2/SDTM1/SDTM2 registers.
3.
The QE never crashes!
- It can stop completely on SDMA faults. You should always have an error handler for this!
- It works with all data/parameters you give it. Wrong parameters may cause fault!
- MURAM Parameter overlaps cause mostly very interesting effects of highly statistical nature.
- Structure alignment messups are the 2nd most common problem.
Are you sure that QE has been running before a new command was issued? Have you try other QE protocols running (e.g. UART)?
4.
Hint. On bootup with disabled QE:
Set complete MURAM to some “odd” value (not zeroes!), e.g., 0x55 that can easily be identified in broken pointers or missing initializations.
Have a great day,
Pavel
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