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products:sbc:common:applications:gpio:40pin-header
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products:sbc:common:applications:gpio:40pin-header [2026/02/03 21:14] gray update by using AI |
products:sbc:common:applications:gpio:40pin-header [2026/02/23 21:18] (current) gray old revision restored (2024/08/12 03:08) |
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| ====== GPIO Header ====== | ====== GPIO Header ====== | ||
| - | ====== GPIO Usage Examples | + | ====== GPIO usage examples |
| <WRAP important > | <WRAP important > | ||
| - | Before using a GPIO, ensure it is not configured | + | Please make sure that the GPIOs you want to use are not configured |
| </ | </ | ||
| - | Once you have identified | + | When you get the GPIO number, |
| ===== Export GPIO ===== | ===== Export GPIO ===== | ||
| - | Make the GPIO accessible to user space: | ||
| ```shell | ```shell | ||
| $ echo 465 | sudo tee / | $ echo 465 | sudo tee / | ||
| ``` | ``` | ||
| - | ===== Set GPIO Direction | + | ===== Set-up GPIO direction |
| - | Configure the GPIO as either an input or an output: | + | We can configure direction |
| ```shell | ```shell | ||
| - | # Set GPIO output | + | $ echo out | sudo tee / |
| - | $ echo out | sudo tee / | + | $ echo in | sudo tee / |
| - | + | ||
| - | # Set GPIO input | + | |
| - | $ echo in | sudo tee / | + | |
| ``` | ``` | ||
| ===== Set GPIO value ===== | ===== Set GPIO value ===== | ||
| - | If configured as an output, you can set its logic level: | ||
| ```shell | ```shell | ||
| - | # Set GPIO output high | + | $ echo 1 | sudo tee / |
| - | $ echo 1 | sudo tee / | + | $ echo 0 | sudo tee / |
| - | + | ||
| - | # Set GPIO output | + | |
| - | $ echo 0 | sudo tee / | + | |
| ``` | ``` | ||
| - | ===== Read GPIO Input value ===== | + | ===== Get GPIO value ===== |
| - | If configured as an input, read its current logic level: | ||
| ```shell | ```shell | ||
| - | $ cat / | + | $ cat / |
| ``` | ``` | ||
| - | The command returns 0 (low) or 1 (high). | ||
| ===== Unexport GPIO ===== | ===== Unexport GPIO ===== | ||
| - | When finished, release the GPIO: | ||
| ```shell | ```shell | ||
| $ echo 465 | sudo tee / | $ echo 465 | sudo tee / | ||
| Line 57: | Line 46: | ||
| ===== Troubleshooting ===== | ===== Troubleshooting ===== | ||
| - | If you encounter an error similar to the following when exporting, the GPIO pin is likely reserved | + | |
| + | If you got the similar error below, it means that the PIN you try to export | ||
| ```shell | ```shell | ||
| - | echo 465 | sudo tee / | + | $ echo 465 | sudo tee / |
| tee: / | tee: / | ||
| ``` | ``` | ||
| - | |||
| - | **Solution**: | ||
Last modified: 2026/02/03 21:14 by gray