I'm trying to send a low signal to the buzzer when I'm not using pwm.

RE: I'm trying to send a low signal to the buzzer when I'm not using pwm.

hmolesworth — Tue, 01 Dec 2020 01:34:15 GMT

Yes, but where - ie in what order?

"To ensure correct behaviour in the PWM module, the pins used by the PWM module must be configured in the GPIO peripheral as described in Table 118: Recommended GPIO configuration before starting PWM generation on page 504 before enabling the PWM module. The pins' idle state is defined by the OUT registers in the GPIO module. This is to ensure that the pins used by the PWM module are driven correctly, if PWM generation is stopped through a STOP task, the PWM module itself is temporarily disabled, or the device temporarily enters System OFF. This configuration must be retained in the GPIO for the selected IOs as long as the PWM module is supposed to be connected to an external PWM circuit"

RE: I'm trying to send a low signal to the buzzer when I'm not using pwm.

schosdas — Tue, 01 Dec 2020 00:43:37 GMT

Oh, I'm sorry.
The code above omitted the main(), but the gpio_init() is in the main().

Thank you.

RE: I'm trying to send a low signal to the buzzer when I'm not using pwm.

hmolesworth — Mon, 30 Nov 2020 18:32:54 GMT

I don't see the background port pin setting function you have being called; try adding this before running, it might fix your issue:

  gpio_init();

RE: I'm trying to send a low signal to the buzzer when I'm not using pwm.

Edvin — Mon, 30 Nov 2020 15:09:07 GMT

My electronics diagram reading is a bit rusty. What is the voltage at 2 when the nRF sets the output pin to low, and what is the volate at 2 when the nRF sets the output pin to high?

Basically, how does this behave? What is it? Is it an NMOSFET?

If I remember correctly, when you set the pin from the nRF to low, the transistor is open, right? So the voltage at 2 should be VDD (3.3V)? Have you tried to measure the voltage at the nRF to check whether it is set to low or not?

BR,

Edvin