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Merge pull request #784 from Pairman/patch-1

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Also update and correct PWM fan operations for ENG
This commit is contained in:
Caize Wu
2025-04-09 18:48:10 +08:00
committed by GitHub
parent d8dfd85970 0040bb5d85
commit ebe58b4b81
1 changed files with 16 additions and 6 deletions
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22
docs/hardware/en/lichee/th1520/lpi4a/6_peripheral.md
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@@ -65,13 +65,23 @@ If it boots successfully, then you can check the following values to confirm tha
## PWM
Take PWM1 which is connected to the cooling fan as an example, you can enable the fan with the following code:
Take PWM1 which is connected to the cooling fan as an example, you can get the fan speed with the following code:
```bash
echo 1 > /sys/class/pwm/pwmchip0/export
echo 1000000 > /sys/class/pwm/pwmchip0/pwm1/period
echo 1000000 > /sys/class/pwm/pwmchip0/pwm1/duty_cycle
echo 1 > /sys/class/pwm/pwmchip0/pwm1/enable
cat /sys/class/hwmon/hwmon0/pwm1
```
The PWM speed value ranges from 0 to 255, where a higher value represents a higher fan speed. You can write ```0``` to the PWM enable control to disable automatic speed regulation, and manually set the fan speed (e.g., 255):
```
echo 0 > /sys/class/hwmon/hwmon0/pwm1_enable
echo 0 > /sys/class/hwmon/hwmon0/pwm1
```
Or you can enable automatic speed regulation with the following code:
```bash
echo 1 > /sys/class/hwmon/hwmon0/pwm1_enable
```
## GPIO
@@ -1155,4 +1165,4 @@ At this point, the HHB environment is preliminarily built. You can try the follo
For further infomation please check [hhb-tools doc](https://www.yuque.com/za4k4z).
## Other
Contributions are welcome~ You can get ￥5~150 ($1~20) coupon if your contribution is accepted!
Contributions are welcome~ You can get ￥5~150 ($1~20) coupon if your contribution is accepted!