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September 4, 2024 03:35
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python3 control gpio with sysfs
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| #!/usr/bin/python3 | |
| from time import sleep | |
| import warnings | |
| def make_wide(formatter, w=120, h=36): | |
| """Return a wider HelpFormatter, if possible.""" | |
| try: | |
| # https://stackoverflow.com/questions/5462873/ | |
| # https://stackoverflow.com/a/5464440 | |
| # beware: "Only the name of this class is considered a public API." | |
| kwargs = {"width": w, "max_help_position": h} | |
| formatter(None, **kwargs) | |
| return lambda prog: formatter(prog, **kwargs) | |
| except TypeError: | |
| warnings.warn("argparse help formatter failed, falling back.") | |
| return formatter | |
| def parse_args(): | |
| import argparse | |
| parser = argparse.ArgumentParser( | |
| description="Control GPIO pins on the uis7720 board", | |
| formatter_class=make_wide(argparse.ArgumentDefaultsHelpFormatter, w=156, h=38), | |
| ) | |
| parser.add_argument("gpio", type=int, help="The GPIO pin to control") | |
| parser.add_argument( | |
| "action", choices=["pulse", "blink", "on", "off"], help="The action to perform" | |
| ) | |
| parser.add_argument( | |
| "--pulse-time", | |
| type=float, | |
| default=1.0, | |
| help="The time to pulse the GPIO pin for in seconds", | |
| ) | |
| parser.add_argument( | |
| "--pulse-from", | |
| choices=["low", "high"], | |
| default="low", | |
| help="The starting state of the pulse", | |
| ) | |
| parser.add_argument( | |
| "--blink-time", | |
| type=float, | |
| default=1.0, | |
| help="The time to blink the GPIO pin for in seconds", | |
| ) | |
| return parser.parse_args() | |
| def export_gpio(gpio): | |
| try: | |
| with open("/sys/class/gpio/export", "w") as f: | |
| f.write(str(gpio)) | |
| except Exception as e: | |
| print("Error exporting GPIO: " + str(e)) | |
| def unexport_gpio(gpio): | |
| try: | |
| with open("/sys/class/gpio/unexport", "w") as f: | |
| f.write(str(gpio)) | |
| except Exception as e: | |
| print("Error unexporting GPIO: " + str(e)) | |
| def direction_output(gpio, val): | |
| try: | |
| with open("/sys/class/gpio/gpio" + str(gpio) + "/direction", "w") as f: | |
| f.write("out") | |
| except Exception as e: | |
| print("Error setting GPIO direction: " + str(e)) | |
| try: | |
| with open("/sys/class/gpio/gpio" + str(gpio) + "/value", "w") as f: | |
| f.write(str(val)) | |
| except Exception as e: | |
| print("Error setting GPIO value: " + str(e)) | |
| def direction_input(gpio): | |
| try: | |
| with open("/sys/class/gpio/gpio" + str(gpio) + "/direction", "w") as f: | |
| f.write("in") | |
| except Exception as e: | |
| print("Error setting GPIO direction: " + str(e)) | |
| def pulse_gpio(gpio, time, from_low): | |
| direction_output(gpio, 0 if from_low else 1) | |
| sleep(time) | |
| direction_output(gpio, 1 if from_low else 0) | |
| sleep(time) | |
| direction_output(gpio, 0 if from_low else 1) | |
| def blink_gpio(gpio, time): | |
| while True: | |
| direction_output(gpio, 1) | |
| sleep(time) | |
| direction_output(gpio, 0) | |
| sleep(time) | |
| def main(): | |
| args = parse_args() | |
| gpio = args.gpio | |
| action = args.action | |
| export_gpio(gpio) | |
| if action == "pulse": | |
| pulse_gpio(gpio, args.pulse_time, args.pulse_from == "low") | |
| elif action == "blink": | |
| blink_gpio(gpio, args.blink_time) | |
| elif action == "on": | |
| direction_output(gpio, 1) | |
| elif action == "off": | |
| direction_output(gpio, 0) | |
| unexport_gpio(gpio) | |
| if __name__ == "__main__": | |
| main() |
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