Posted on May 23, 2006 at 04:49Hello Everyone,
I'm working on a motor control solution with the ST7 in combination with a igbt power module. I got a problem while trying to implement a simple detection of the module failure feedback signal, connected to the /MCES pin of the ST7. I simply enabled the emergency stop interrupt in the MIMR register and implemented the interrupt service routine for the emergency stop and speed error interrupts.
Everything works fine (when I pull the /MCES pin low the interrupt service routine is called), except clearing the pending interrupt flag of the emergency stop by
MISR = ((unsigned char)~MISR_EI_OR);
If I leave the /MCES pin low and clear the interrupt flag, the interrupt service routine is called again and again, even when writing MISR = 0;
According to the ST7 user manual, the emergency stop interrupt flag will only be set when detecting an edge on the /MCES pin, not when the pin is in a static low state.
I don't know what to try anymore. Can anyone help me?
Thanks in advance!
