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The limitation you’re encountering with the minimum PWM frequency of 2.5Hz on the Toradex Verdin AM62 D 1GB ET is indeed a hardware restriction. This is due to the PWM controller’s design, which has a maximum period of 469000000ns, making it impossible to achieve a 1Hz PWM signal without modifications.
Here are some potential workarounds you could consider:
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Adjusting the Base Clock: You could try modifying the Base Clock settings in the device tree. This might allow for different clock configurations that could enable lower PWM frequencies. However, be cautious as this could affect the overall system clock configuration and other components.
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Using a Larger Counter Register: If the hardware supports it, increasing the counter size might allow for finer control over the PWM period, potentially enabling a 1Hz output. This would depend on the specific capabilities of the PWM hardware in your device.
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External PWM Generators: If the above options do not work, consider using an external PWM generator or a dedicated timer. These can provide the required frequency and duty cycle with higher accuracy than software toggling of GPIO pins.
Since software toggling of a GPIO pin has proven too inaccurate for your needs, focusing on hardware-based solutions or configurations is advisable. Consulting the hardware documentation for the Verdin AM62 may provide additional insights into possible configurations or workarounds.
Please, also check if these links can help you solve your problem:
PWM switching on and off at low frequency when high frequency is set for backlight.