ChibiOS Free Embedded RTOS

Hi Giovanni,
I intend to use the Hall Sensor Interface, provided by e.g. STM32F3 or F4.
To do so, an interfacing timer is needed to be configured, to capture any Hall sensor change (a Special XOR-functionality allows, to use only one channel for this purpose). This can be seen as an ICU functionality.

Furthermore, the same interfacing timer shall be used to generate a positive pulse after a programmed delay (in Output compare or PWM mode).

To implement this functions with ChibiHAL, I have to add specific low-level functions of course.
But, I generally don't know which driver (PWM, ICU, TIM) shall be used for the described interfacing timer?
Do you have any suggestions, how to deal with this problem?

Regards,
Daniel

Hi,

The solution could also be a custom driver written following the HAL templates. Could you provide some documentation about the protocol? Using the timer for capture and also pulse generation is something I never did.

Giovanni

Hi,
how to interface with Hall sensors is described e.g. in ST Reference Manual RM0316 for STM32F303... in chapter 20.3.23:

Link to Manual:
http://www.st.com/web/en/resource/technical/document/reference_manual/DM00043574.pdf

Daniel

I missed that.

It is two timers not one. I think you should create a custom driver for the interfacing timer, it just does setup because there is no API required except start(). The second timer could use the PWM driver but I am not sure about the required changes. The manual mentions some bit manipulation in an ISR, not sure if that could go into an existing callback.

Giovanni