Q&A interrupt driven serial comms

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NicFord on Mar 23, 2020

I'm using FIQ for serial comms. It works but when transmitting I'm getting extra FIQ UART interrupts at about 330KHz (consuming a lot of processing time) even though the transmitter buffer emty status is not asserted. Has anyone come across this?

0 NicFord on Mar 23, 2020 11:30 AM 11 months ago

I should add this is an ADuC 7026 and I suspect the UART interrupt bit is staying asserted all the time when a transmit is in progress, not just when the TX buffer is empty.
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0 NicFord on Mar 23, 2020 1:53 PM 11 months ago in reply to NicFord

Fixed it myself now. Was monitoring TEMT instead of THRE in the interrupt routine.
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