Date
1 - 4 of 4
stm32 quadrature decoder general purpose timer functionality
|
Matias N.
Hi, I need to access STM32's general purpose timer's quadrature decoding functionality. I'm trying to understand what exactly is needed to expose this, either write a custom driver accessing arch-dependant interface directly or if there's at least some support exposed via counter API for example. I see there's specific driver for STM32 PWM functionality so I would guess a similar driver is needed. There's also STM32 counter driver but this would be a different kind of counter (requires special setup of timer). I also see bindings for other platforms which have dedicated QDEC peripherals, so I'm guessing that a similar DTS binding should also be added. What would be the proper way to do this? Best, Matias |
|
|
|
Piotr Mienkowski
Hi Matias,
On 21.06.21 20:42, Matias N. wrote: I need to access STM32's general purpose timer's quadrature decoding functionality. I'm trying to understand what exactly is needed to expose this, either write a custom driver accessing arch-dependant interface directly or if there's at least some support exposed via counter API for example.So far support for quadrature decoding functionality of a general purpose timer/counter module has been implemented as a dedicated sensor driver. You can check * drivers/sensor/qdec_nrfx * drivers/sensor/qdec_sam They use a different binding than a regular counter driver. It's the compatible property of the timer/counter DT node that decides which driver will 'own' it. There is also a basic sample app to demo the driver: samples/sensor/qdec. Regards, Piotr |
|
|
|
Matias N.
I thought I sent an answer but I don't see it here so I'll send again.
Thanks for the reply. What I was looking for is a way that could be acceptable for merging upstream, if possible. So should I add a special binding for STM32 decoder functionality? Or what would be the preferred way? Best, Matias |
|
|
|
Piotr Mienkowski
Hi Matias,
toggle quoted message
Show quoted text
The best way to get stm32 quadrature decoder driver merged into Zephyr is to follow example of qdec_nrfx.c, qdec_sam.c drivers. Check PRs that introduced the respective drivers to see what files need to be added / modified. Yes, you'll need a new binding. Regards, Piotr On 30.06.21 14:49, Matias N. wrote:
I thought I sent an answer but I don't see it here so I'll send again. |
|
|