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[solved] Interrupt priorities

Question asked by Patrik Schantl on Nov 25, 2014
Latest reply on Apr 24, 2015 by Erwan Y

Yesterday, I investigated a problem with my software project for an SPC560B. There are several calculations running on the controller and it additionally communicates over UART with a PC. When I tried to increase the UART baud rate, I got the effect that the controllers "miss" some bytes sent by the PC.
I found out, that reason for that effekt has something to do with the UART RX interrupt and an interrupt created by the periodical timer PIT. After the PIT causes an interrupt, the UART RX can not trigger an interrupt. I always thought that a higher priority interrupt can break the program even when another lower prior interrupt is currently running?

Best regards,