用python写通过sysfs方式实现定时读取gpio输入的值的代码
时间: 2024-05-06 16:21:24 浏览: 6
这是一个技术问题,我可以帮您回答。以下是一个简单的Python代码示例,可以实现通过sysfs方式定时读取GPIO输入的值:
```python
import time
# GPIO的编号
gpio_num = "18"
# GPIO的方向(in表示输入)
gpio_direction = "in"
# GPIO的值
gpio_value = ""
# GPIO的路径(根据不同的硬件平台可能会有所不同)
gpio_path = "/sys/class/gpio/gpio{}/value".format(gpio_num)
# 初始化GPIO
with open("/sys/class/gpio/export", "w") as f:
f.write(gpio_num)
with open("/sys/class/gpio/gpio{}/direction".format(gpio_num), "w") as f:
f.write(gpio_direction)
# 定时读取GPIO输入的值
try:
while True:
with open(gpio_path, "r") as f:
gpio_value = f.read()
print("GPIO输入的值为:{}".format(gpio_value))
time.sleep(1)
except KeyboardInterrupt:
pass
# 清除GPIO
with open("/sys/class/gpio/unexport", "w") as f:
f.write(gpio_num)
```
希望能帮助到您!