If SQL_DET is set to GPIO this configuration variable is used to choose which GPIO pin to use for squelch input. The most common name is gpio, like gpio4. Some GPIO drivers use more complex names, like gpio33_pe11. If inverted operation is desired, prefix the pin name with an exclamation mark (!).
Use this configuration variable to specify which type of hardware to use to control the PTT. Specify "SerialPin" for using a pin in the serial port, "GPIO" to use a pin in a GPIO port, "PTY" if you want to use an external interface script via a pseudo tty port or "Hidraw" to use the linux/hidraw driver to support hidraw devices like CM108 sound card, e.g. URI device from DMK.
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If GPIO was specified in PTT_TYPE, set the PTT_PIN config variable to the pin name of the GPIO-pin to use. The most common name is gpio, like gpio3. Some GPIO drivers use more complex pin names like gpio33_pe11. Have a look at the USING GPIO section for information on how to set up the operating system. Normally, the pin will be active high but if the pin name is prefixed with an exclamation mark it will be active low instead. For some hardware platforms you may need to also set the GPIO_PATH configuration variable. 2ff7e9595c
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