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products:sbc:common:applications:gpio:pwm [2022/07/04 04:52] frank add PWM |
products:sbc:common:applications:gpio:pwm [2023/03/30 23:56] nick |
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===== Introduction ===== | ===== Introduction ===== | ||
- | This document mainly describes | + | This page introduces the usage of hardware PWM, and leads you to control the hardware PWM on the [[products: |
+ | |||
+ | ===== PWM Reference Table ===== | ||
+ | |||
+ | | | ||
+ | ^ VIM1 | ||
+ | ^ VIM2 | ||
+ | ^ VIM3 | ||
+ | ^ VIM3L | '' | ||
+ | ^ VIM4 | ||
+ | ^ VIM1S | '' | ||
===== Enable PWM ===== | ===== Enable PWM ===== | ||
- | <tabbox VIM1/3/3L/4> | + | In order to use the PWM, you need to enable the PWM function via [[products: |
- | PWM_F: | + | |
- | ```sh | + | <tabbox VIM1/2/3/Edge1> |
- | $ echo 1 | sudo tee > /sys/class/pwm/ | + | |
- | $ echo 1000000 | sudo tee > / | + | Edit '' |
- | $ echo 500000 | sudo tee > / | + | |
- | $ echo 1 | sudo tee > / | + | Take VIM3 as an example to enable '' |
+ | |||
+ | ```shell | ||
+ | overlays=uart3 pwm_f i2c3 i2s os08a10 watchdog | ||
``` | ``` | ||
+ | |||
+ | After reboot, you will see the pwm device node. | ||
+ | |||
+ | ```shell | ||
+ | $ ls / | ||
+ | device | ||
+ | ``` | ||
+ | |||
+ | <tabbox VIM3L> | ||
+ | |||
+ | Edit ''/ | ||
+ | |||
+ | Take VIM3L as an example to enable '' | ||
+ | |||
+ | ```shell | ||
+ | overlays=uart3 pwm_f i2c3 i2s watchdog | ||
+ | ``` | ||
+ | |||
+ | After reboot, you will see the pwm device node. | ||
+ | |||
+ | ```shell | ||
+ | $ ls / | ||
+ | device | ||
+ | ``` | ||
+ | |||
+ | <tabbox VIM4> | ||
+ | |||
+ | Edit ''/ | ||
+ | |||
+ | |||
+ | You need to add '' | ||
+ | |||
+ | ```shell | ||
+ | fdt_overlays=pwm_f | ||
+ | |||
+ | ``` | ||
+ | |||
+ | After reboot, you will see the pwm device node. | ||
+ | |||
+ | ```shell | ||
+ | $ ls / | ||
+ | device | ||
+ | ``` | ||
+ | |||
+ | <tabbox VIM1S> | ||
+ | |||
+ | Edit ''/ | ||
+ | |||
+ | |||
+ | You need to add '' | ||
+ | |||
+ | ```shell | ||
+ | fdt_overlays=pwm_f | ||
+ | |||
+ | ``` | ||
+ | |||
+ | After reboot, you will see the pwm device node. | ||
+ | |||
+ | ```shell | ||
+ | $ ls / | ||
+ | device | ||
+ | ``` | ||
+ | </ | ||
+ | |||
+ | ===== Disable PWM to Use GPIO ===== | ||
+ | |||
+ | If you want to use normal GPIO instead of PWM, you can remove the PWM node in [[products: | ||
+ | |||
+ | ===== Control PWM ===== | ||
+ | |||
+ | **Enable PWM:** | ||
+ | |||
+ | <tabbox VIM1/ | ||
+ | |||
+ | ```shell | ||
+ | echo 1 | sudo tee / | ||
+ | echo 1000000 | sudo tee / | ||
+ | echo 500000 | sudo tee / | ||
+ | echo 1 | sudo tee / | ||
+ | ``` | ||
+ | |||
<tabbox VIM2> | <tabbox VIM2> | ||
- | PWM_D: | + | |
- | ```sh | + | ```shell |
- | $ echo 1 | sudo tee > / | + | echo 1 | sudo tee / |
- | $ echo 1000000 | sudo tee > / | + | echo 1000000 | sudo tee / |
- | $ echo 500000 | sudo tee > / | + | echo 500000 | sudo tee / |
- | $ echo 1 | sudo tee > / | + | echo 1 | sudo tee / |
+ | ``` | ||
+ | |||
+ | <tabbox VIM3L/ | ||
+ | |||
+ | ```shell | ||
+ | echo 1 | sudo tee / | ||
+ | echo 1000000 | sudo tee / | ||
+ | echo 500000 | sudo tee / | ||
+ | echo 1 | sudo tee / | ||
``` | ``` | ||
</ | </ | ||
Line 33: | Line 137: | ||
</ | </ | ||
- | ===== Disable PWM ===== | + | **Disable PWM:** |
- | <tabbox VIM1/3/3L/4> | + | <tabbox VIM1/ |
- | ```sh | + | ```shell |
- | $ echo 0 | sudo tee > / | + | echo 0 | sudo tee / |
``` | ``` | ||
<tabbox VIM2> | <tabbox VIM2> | ||
- | ```sh | + | ```shell |
- | $ echo 0 | sudo tee > / | + | echo 0 | sudo tee / |
+ | ``` | ||
+ | <tabbox VIM3L/ | ||
+ | ```shell | ||
+ | echo 0 | sudo tee / | ||
``` | ``` | ||
</ | </ | ||