【Luckfox RV1103】2. Basic peripheral test-gpio (python)

FFD8

【Luckfox RV1103】2. Basic peripheral test-gpio (python) [Copy link]

<div class='showpostmsg'><i class="pstatus">This post was last edited by FFD8 on 2024-2-29 10:14</i> # 【Luckfox RV1103】2. Basic peripheral test-gpio (python) Reference tutorial: https://wiki.luckfox.com/zh/Luckfox-Pico/Luckfox-Pico-GPIO Luckfox RV1103 pin diagram: 
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 ## 1. Device directory: In the /sys/class/gpio directory, each GPIO device has its own folder. The names of these folders are gpio plus the pin number, for example, /sys/class/gpio/gpio55 means the pin number is 55, that is, GPIO1_C7_d. Use the following command to view: ls /sys/class/gpio/ 
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 ## 2. Device properties: In these device directories, you can also find control files related to GPIO pins, including direction, value, and interrupts. Each GPIO device directory contains a set of property files, which are used to configure and manage GPIO pins. You can use the following command to view in the GPIO device directory: ### 1. View the property file of the gpio55 device ```xml # echo 55 > /sys/class/gpio/export # cd gpio55 # ls value power subsystem active_low uevent edge device direction ``` 
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 ### 2. Property files By using these property files, you can easily configure and control GPIO pins to adapt them to different application scenarios and requirements. Some of the key properties include: - Direction: - Configure as input: in - Configure as output: out - Value: - Output low level: 0 - Output high level: 1 - Interrupt edge: - Rising edge trigger: rising - Falling edge trigger: falling - Both edges trigger: both - Disable interrupt: none ### 3. Control the GPIO pin level The property file of the device is equivalent to the parameter interface of a function. For /sys/class/gpio/gpio55/value, each time a write operation is performed on the file, the driver code will be triggered to use the content written this time as a parameter to modify the pin level of gpio55; and each time a read operation is performed, the driver code will be triggered to update the current pin level of gpio55 to the /sys/class/gpio/gpio55/value file. ## 3. The python code program realizes input and output control by controlling the two pins 55 and 54. Find these two pins according to the pin diagram. 
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 ```python from periphery import GPIO import time Write_Pin = 55 Read_Pin = 54 Write_GPIO = GPIO(Write_Pin, "out") Read_GPIO = GPIO(Read_Pin, "in") try: while True: try: Write_GPIO.write(True) pin_state = Read_GPIO.read() print(f"Pin state: {pin_state}") Write_GPIO.write(False) pin_state = Read_GPIO.read() print(f"Pin state: {pin_state}") time.sleep(1) except KeyboardInterrupt: Write_GPIO.write(False) break except IOError: print("Error") finally: Write_GPIO.close() Read_GPIO.close() ``` Initialize pin 55 as the output port and pin 54 as the input port; The program loop sets pin 55 to pull high first, then pull low, while pin 54 continuously reads level data. ## 4. Run the program to create a py program: nano gpio.py Copy the code to py and save it 
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 Run the program: python3 gpio.py Result display: You can see that the program prints out the level value of pin 54. At the beginning, it was always false. Halfway through, 55 and 54 were short-circuited, and the level value changed, one high and one low; after disconnecting, it returned to false, and after shorting again, the high and low state was repeated. The running results show that the program meets the expected performance. 
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 <div id="player_6473d1d12619c14aee3f2b73e42e034e0" class="localvideo-box"></div><div class="localvideo-title">gpio_test</div><br/></div><script>					var loginstr = '<div class="locked">To view all the contents of the post, please <a href="/bbs/member.php?mod=logging&action=login"   style="color:#e60000" class="loginf">log in</a> or <a href="/bbs/member.php?mod=register_eeworld.php&action=wechat" style="color:#e60000" target="_blank">register</a></div>';
					
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Jacktang

The results show that the program meets the expected performance

FFD8

Jacktang posted on 2024-2-29 07:48 The results show that the program meets the expected performance

【Luckfox RV1103】2. Basic peripheral test-gpio (python) [Copy link]

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