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Digi APIX ADC Example Application

Example application to access and manage ADC channels using the Digi APIX library.

This application enables one ADC channel on the board. After that, the application takes periodic samples and prints the raw value and the value in mv.

The ADC lines used in this example are mapped as follows in the Digi boards:

  • ConnectCore MP13 DVK: ADC1_INP14 (MikroBus socket, J31, Pin 1).
  • ConnectCore MP15 DVK: AN0 (GPIO connector, J41, Pin 4).
  • ConnectCore MP25 DVK: ANA0 (GPIO connector, J8, Pin 19).
  • ConnectCore 8M Mini DVK: MCA_IO1 (channel 1) at XBEE1_UART_TX. By default this ADC channel is not enabled, you need to modify the device tree.
  • ConnectCore 8M Nano DVK: MCA_IO1 (channel 1) at XBEE1_UART_TX. By default this ADC channel is not enabled, you need to modify the device tree.
  • ConnectCore 8X SBC Pro: ADC_IN0 (Expansion connector, J27, Pin D13).
  • ConnectCore 8X SBC Express: ADC_IN0 (Expansion connector, J17, Pin 2).
  • ConnectCore 6UL SBC Pro: ADC1_IN2 (GPIO connector, J30, Pin 13).
  • ConnectCore 6UL SBC Express: ADC1_IN4 (Expansion connector, J8, Pin 7).
  • ConnectCore 6 Plus SBC: PMIC_ADCIN1 (GPIO connector, J30, Pin 1).
  • ConnectCore 6 SBC: PMIC_ADCIN1 (GPIO connector, J30, Pin 1).

Running the application

Once the binary is in the target, launch the application:

~# ./apix-adc-example
Example application using libdigiapix ADC support

Usage: apix-adc-example <adc_chip> <adc_channel> <interval> <number_of_samples>

<adc_chip>           ADC chip number or alias
<adc_channel>        ADC channel number or alias
<interval>           Time interval for sampling
<number_of_samples>  Number of samples to get

Alias for ADC can be configured in the library config file

If no arguments are provided, the example will use the default values:

  • For the interfaces, default values are configured in /etc/libdigiapix.conf.
  • Specific application default values are defined in the main file.

Compiling the application

This demo can be compiled using a Digi Embedded Yocto based toolchain. Make sure to source the corresponding toolchain of the platform you are using, for example, for ConnectCore 6UL:

~$ . <DEY-toolchain-path>/environment-setup-cortexa7t2hf-neon-dey-linux-gnueabi
~$ make

For more information, see the Digi Embedded Yocto online documentation.

License

Copyright 2017-2023, Digi International Inc.

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.