|
I am processing 4 pulse inputs on port B of a 56827, each about 200nsec and somewhat random occurance. I had been losing interrupts (missing pulses) when he pulses occurred within the interrupt processing time. The cause appears to be reseting the IPR via IESR with a BFSET vs a MOVE instruction. Non-working Code if (ArchIO.PortB.IntPendingReg & bit_1) { // a fast process ArchIO.PortB.IntEdgeSensReg |= bit_1; // generates: bfset #bit_1,X:RegAddr } // more bits tested and processed with same code different bits Working Code if (ArchIO.PortB.IntPendingReg & bit_1) { // a fast process ArchIO.PortB.IntEdgeSensReg = bit_1; // generates: movei #bit_1,X:RegAddr } // more bits tested and processed with same code different bits hmmmmm.................. |
GPIO Interrupts
Started by ●July 29, 2003
