Commit 051a2b6c authored by Pierrick Curt's avatar Pierrick Curt Committed by Benjamin Cabé
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samples: drivers: adc: example to use AD4114 on stm32f3_disco 

This examples shows how to use the AD4114 ADC on a
stm32f3_disco board.
As the AD4114 is a 24bits ADC resolution we need to be able
to pass 32bits buffer to get the samples.
CONFIG_SEQUENCE_RESOLUTION is set to 12 instead of 24, and the
gain zephyr,vref-mv is adapted to avoid overflows using the
exisiting adc_raw_to_millivolts function.

Signed-off-by: default avatarPierrick Curt <pierrickcurt@gmail.com>
parent 8250cc68

samples/drivers/adc/adc_sequence/Kconfig

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Changes for samples/drivers/adc/adc_sequence/Kconfig: 4 added lines, 0 removed lines.
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@@ -9,4 +9,8 @@ config SEQUENCE_RESOLUTION 
	int "Set the resolution of the sequence readings."

	default 12



config SEQUENCE_32BITS_REGISTERS

	bool "ADC data sequences are on 32bits"

	default n



source "Kconfig.zephyr"

samples/drivers/adc/adc_sequence/boards/stm32f3_disco.conf

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Changes for samples/drivers/adc/adc_sequence/boards/stm32f3_disco.conf: 4 added lines, 0 removed lines.
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# A4114 driver can only acquire one sequence sample

CONFIG_SEQUENCE_SAMPLES=1

CONFIG_SEQUENCE_RESOLUTION=12

CONFIG_SEQUENCE_32BITS_REGISTERS=y

samples/drivers/adc/adc_sequence/boards/stm32f3_disco.overlay

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+146 −0
Changes for samples/drivers/adc/adc_sequence/boards/stm32f3_disco.overlay: 146 added lines, 0 removed lines.
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/*

 * Copyright (c) 2024 Pierrick Curt

 *

 * SPDX-License-Identifier: Apache-2.0

 */



/ {

	aliases {

		adc0 = &adc_ad4114;

	};

};



&spi1 {

	pinctrl-0 = <&spi1_nss_pa4 &spi1_sck_pa5

		     &spi1_miso_pa6 &spi1_mosi_pa7>;

	pinctrl-names = "default";

	status = "okay";



	adc_ad4114: adc_ad4114@0 {

		compatible = "adi,ad4114-adc";

		spi-max-frequency = <DT_FREQ_M(1)>;

		status = "okay";

		reg = <0>;

		#io-channel-cells = <1>;

		#address-cells = <1>;

		#size-cells = <0>;



		/* INPUTx mapping bits [9:0] for CH0 to CH15 */

		map-inputs = <0x10 0x30 0x50 0x70 0x90 0xB0 0xD0 0xF0 0x110 \

					0x130 0x150 0x170 0x190 0x1B0 0x1D0 0x1F0>;





		channel@0 {

			reg = <0x0>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@1 {

			reg = <1>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@2 {

			reg = <2>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@3 {

			reg = <3>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@4 {

			reg = <4>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@5 {

			reg = <5>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@6 {

			reg = <6>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@7 {

			reg = <7>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@8 {

			reg = <8>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@9 {

			reg = <9>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@a {

			reg = <0xa>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@b {

			reg = <0xb>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@c {

			reg = <0xc>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@d {

			reg = <0xd>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@e {

			reg = <0xe>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

		channel@f {

			reg = <0xf>;

			zephyr,gain = "ADC_GAIN_1";

			zephyr,reference = "ADC_REF_EXTERNAL0";

			zephyr,vref-mv = <8>;

			zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;

		};

	};

};

samples/drivers/adc/adc_sequence/sample.yaml

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Changes for samples/drivers/adc/adc_sequence/sample.yaml: 1 added line, 0 removed lines.
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ tests: 
      - nrf54h20dk/nrf54h20/cpuapp

      - ucans32k1sic

      - frdm_mcxc242

      - stm32f3_disco

    integration_platforms:

      - nrf52840dk/nrf52840

    harness: console

samples/drivers/adc/adc_sequence/src/main.c

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Changes for samples/drivers/adc/adc_sequence/src/main.c: 4 added lines, 0 removed lines.
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@@ -30,7 +30,11 @@ int main(void) 
{

	int err;

	uint32_t count = 0;

#ifdef CONFIG_SEQUENCE_32BITS_REGISTERS

	uint32_t channel_reading[CONFIG_SEQUENCE_SAMPLES][CHANNEL_COUNT];

#else

	uint16_t channel_reading[CONFIG_SEQUENCE_SAMPLES][CHANNEL_COUNT];

#endif



	/* Options for the sequence sampling. */

	const struct adc_sequence_options options = {

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