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TMS570LC4357: TMS570LC4357

Part Number: TMS570LC4357

We've had Interrupts working for a few years, but we are now adding additional functionality and when we add two MIBSPI interfaces with many continuous transactions that have end of transmission interrupts, interrupts eventually stop.  We have code monitoring the RTIs and we see that the RTIs stop occurring after several minutes. Any ideas on where I could look to resolve this issue?