Kinetis Microcontrollers中的主题 Re: Reading Analog Input from FRDM-K22F

Reading Analog Input from FRDM-K22F

xhr1s — Fri, 25 Nov 2022 15:10:23 GMT

Hello, I'm trying to read the value of the A0 pin from the FRDM-K22F development board as an analog input. I have defined it as a input GPIO pin using the pin configuration tool in MCUXpresso. Is this the way to do it? GPIO_ReadPinInput(BOARD_A0_GPIO, BOARD_A0_PORT, BOARD_A0_PIN);

Re: Reading Analog Input from FRDM-K22F

ErichStyger — Fri, 25 Nov 2022 15:41:50 GMT

GPIO_ReadPinInput() reads the pin as digital (high, low) input pin, not as analog pin. I suggest you have a look at the analog examples in the SDK how to configure and read the pin as analog pin?

Re: Reading Analog Input from FRDM-K22F

xhr1s — Fri, 25 Nov 2022 16:29:42 GMT

Yup. You're right. After reading the documentation at https://mcuxpresso.nxp.com/api_doc/dev/329/group__lpc__gpio.html it is obvious, sorry. It's a bit difficult making sense of the ADC sdk examples, I only need to read one value at a time. The API calls are also not very friendly. Perhaps there is an easier way to do it? I can't seem to figure out any other analog pin read examples.

Re: Reading Analog Input from FRDM-K22F

xhr1s — Thu, 08 Dec 2022 15:46:49 GMT

So, I still am not able to figure out how to read analog data from an input pin. Which example should I look at?

Any help is appreciated.

Re: Reading Analog Input from FRDM-K22F

_Leo_ — Tue, 13 Dec 2022 22:09:37 GMT

The SDK examples that you can use as a reference are the following: