88 lines
2.9 KiB
Python
88 lines
2.9 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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'''
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# @Time : 2025/2/18 17:49
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# @Author : hjw
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# @File : export_pin.py
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'''
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import os
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import time
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class GPIOChipController:
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def __init__(self, chip_path="/sys/class/gpio/gpiochip0"): # 注意引脚分组
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# 读取GPIO控制器信息
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self.base = int(self._read_file(os.path.join(chip_path, "base")))
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self.ngpio = int(self._read_file(os.path.join(chip_path, "ngpio")))
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self.label = self._read_file(os.path.join(chip_path, "label"))
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print(f"GPIO控制器信息: {self.label} (base={self.base}, ngpio={self.ngpio})")
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def _read_file(self, path):
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with open(path, 'r') as f:
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return f.read().strip()
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def _write_file(self, path, value):
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with open(path, 'w') as f:
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f.write(str(value))
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def export_gpio(self, offset):
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"""导出指定控制器的GPIO引脚"""
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if offset < 0 or offset >= self.ngpio:
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raise ValueError(f"偏移量必须在0-{self.ngpio - 1}范围内")
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gpio_number = self.base + offset
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export_path = "/sys/class/gpio/export"
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if not os.path.exists(f"/sys/class/gpio/gpio{gpio_number}"):
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try:
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self._write_file(export_path, gpio_number)
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time.sleep(0.1) # 等待系统创建目录
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except IOError as e:
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if "Device or resource busy" in str(e):
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print(f"GPIO{gpio_number} 已经导出")
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else:
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raise
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return gpio_number
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def setup_gpio(self, gpio_number, direction='out'):
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"""配置GPIO方向"""
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direction_path = f"/sys/class/gpio/gpio{gpio_number}/direction"
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self._write_file(direction_path, direction)
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def set_gpio(self, gpio_number, value):
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"""设置GPIO电平"""
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value_path = f"/sys/class/gpio/gpio{gpio_number}/value"
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self._write_file(value_path, 1 if value else 0)
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def read_gpio(self, gpio_number):
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"""读取GPIO电平"""
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value_path = f"/sys/class/gpio/gpio{gpio_number}/value"
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return int(self._read_file(value_path))
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if __name__ == "__main__":
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"""
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rk3506导出引脚
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该脚本导出扩展口引脚 SAI1_SDO0（17） 对应 GPIO0_B4_d 8 + 4 = 12
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"""
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try:
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# 初始化GPIO控制器
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ctrl = GPIOChipController()
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# 导出并配置GPIO (假设控制器的base=0，偏移量B4即12)
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gpio_num = ctrl.export_gpio(12)
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ctrl.setup_gpio(gpio_num, 'out')
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# 引脚高低电平测试
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for _ in range(10):
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ctrl.set_gpio(gpio_num, 1)
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print(f"GPIO{gpio_num} 置高")
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time.sleep(10)
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ctrl.set_gpio(gpio_num, 0)
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print(f"GPIO{gpio_num} 置低")
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time.sleep(1)
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except PermissionError:
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print("需要root权限！请使用sudo运行")
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except Exception as e:
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print(f"发生错误: {str(e)}") |