Queue task Problem
Hallo!
I wrote a device driver which handles the SCC in UART mode of a MPC860T for a simple protocol. The protocol start with a byte, the other side send a ack, then the packet will be sent. At last an ack will be send from the receiver. My problem is, that sometimes the bottom half part of my software won't be executed.
For example I send the start character, the other side answer with an ack, but nothing else happens, I got an timeout, and there I compare counters for hardware interrupt and bottom half part of software, and they are different. With an terminal program I see, tht that is my fault (the ack would be sent). Does anyone knows this phenomenon? On transmission side I also have sometimes this problem.
Thanks in advanced
Gerhard
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Quoted 6 lines · In message <[email protected]> you wrote:
I wrote a device driver which handles the SCC in UART mode of a MPC860T for a simple protocol. The protocol start with a byte, the other side send a ack, then the packet will be sent. At last an ack will be send from the receiver. My problem is, that sometimes the bottom half part of my software won't be executed.
Ummm... is there any good reason (except maybe for a training exercise to write a new driver for that instead of using the existing (and working) SCC UART driver?
Wolfgang Denk
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Software Engineering: Embedded and Realtime Systems, Embedded Linux
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