drivers: add support of pwm capture driver

[zouboan]

Summary

1. add lower half support of capture for stm32_capture, because there's no external interface for device driver in stm32_capture.c;
2. add support of pwm input capture driver in drivers/timers;
3. add setup of pwm capture device on stm32f4discovery board, for pwm input capture test;

Impact

stm32 timers and capture

Testing

Tested on custom board based on stm32f405 and stm32f4discovery board, the duty and frequence measurement result is correct.

[acassis]

Very nice @zouboan !!! Are you planing to add an app/ example to use /dev/capture0 ? Is it able to read PWM pulse used to control servo motors? I'm thinking about connecting a PWM signal from a RC receiver (i.e. I have a FrSky TFR6) and show the joystick position on NuttX

[zouboan]

Ok，i will add a capture example in apps

…

---Original--- From: "Alan Carvalho de ***@***.***> Date: Tue, Jun 28, 2022 07:10 AM To: ***@***.***>; Cc: ***@***.******@***.***>; Subject: Re: [apache/incubator-nuttx] drivers: add support of pwm capture driver (PR #6525) Very nice @zouboan !!! Are you planing to add an app/ example to use /dev/capture0 ? Is it able to read PWM pulse used to control servo motors? I'm thinking about connecting a PWM signal from a RC receiver (i.e. I have a FrSky TFR6) and show the joystick position on NuttX — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: ***@***.***>