Hello, fellow enthusiasts! I wanted to share my recent journey working with the NRF54L15 development kit and Zephyr SDK 3.0.2. It’s been an exciting project, but not without its challenges. My goal was to create a system that controls a DC motor using PWM outputs and measures its current using an ADC input. However, I encountered an issue while setting up the ADC channel, which led to an error code of -134. After spending considerable time troubleshooting, I thought it would be helpful to document my experience and findings for anyone else facing similar issues.
The Setup
I started by defining the necessary variables for the ADC setup, including the current threshold, resistance value, and gain factor. The ADC channel was set up using the adc_dt_spec_get function, and I included logging statements to monitor the process. The motor control involved two PWM outputs for IN1 and IN2, with buttons to adjust the PWM pulse width for speed control. Additionally, an LED was used as an indicator when the motor current exceeded the threshold.
The Challenge
Despite configuring the ADC channel and ensuring the device was ready, I consistently received an error message indicating that the ADC channel setup had failed. I tried adjusting the pin configuration and gain settings, but the issue persisted. This was frustrating, as the ADC functionality was crucial for the motor current monitoring feature.
The Solution
After extensive research and debugging, I realized that the issue might be related to the Device Tree (DT) configuration. I revisited my .overlay file and ensured that the ADC channel was correctly specified. I also double-checked the compatibility of the ADC settings with the NRF54L15 hardware. By carefully reviewing the Zephyr documentation and comparing my setup with working examples, I identified a missing configuration parameter in the DT file. Adding this parameter resolved the issue, and the ADC channel was successfully initialized.
Lessons Learned
This experience taught me the importance of meticulous configuration and the value of thorough documentation. It also highlighted the significance of community support and resources like the Zephyr project forums. By sharing my journey, I hope to help others avoid similar pitfalls and encourage a collaborative approach to overcoming technical challenges.
If anyone has additional insights or alternative solutions, I’d love to hear them! Let’s continue to learn and grow together in the world of embedded systems and IoT.
Cheers,
[Your Name]