Hello,
As part of a system selftest, I'm trying to reliably test that the speaker isn't shorted.
I'm trying to detect a shock in 2 ways:
- After I turn on the class D power stage (P1R32), I wait 500 ms and then read back P1R32 to see if D7 is set.
- I also read P0R44 an check the state of D7.
On some boards this works but on others it doesn't. How can I make my test more reliable?
As a 2nd part of my selftest a beep is emitted and I use the ADC on my microcontroller to detect a step change in the current. This works ok when no speaker / a speaker is present. However when I remove the speaker and replace it with a short there is also a step change in the current. Why is this the case?
Thanks in advance for your help with this.
Regards,
Alan
