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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: Pierrick Curt <[email protected]>
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‎samples/drivers/adc/adc_sequence/Kconfig

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@@ -9,4 +9,8 @@ config SEQUENCE_RESOLUTION
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int "Set the resolution of the sequence readings."
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default 12
1111

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config SEQUENCE_32BITS_REGISTERS
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bool "ADC data sequences are on 32bits"
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default n
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source "Kconfig.zephyr"

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

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# A4114 driver can only acquire one sequence sample
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CONFIG_SEQUENCE_SAMPLES=1
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CONFIG_SEQUENCE_RESOLUTION=12
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CONFIG_SEQUENCE_32BITS_REGISTERS=y

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

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/*
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* Copyright (c) 2024 Pierrick Curt
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/ {
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aliases {
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adc0 = &adc_ad4114;
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};
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};
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&spi1 {
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pinctrl-0 = <&spi1_nss_pa4 &spi1_sck_pa5
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&spi1_miso_pa6 &spi1_mosi_pa7>;
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pinctrl-names = "default";
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status = "okay";
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adc_ad4114: adc_ad4114@0 {
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compatible = "adi,ad4114-adc";
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spi-max-frequency = <DT_FREQ_M(1)>;
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status = "okay";
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reg = <0>;
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#io-channel-cells = <1>;
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#address-cells = <1>;
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#size-cells = <0>;
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/* INPUTx mapping bits [9:0] for CH0 to CH15 */
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map-inputs = <0x10 0x30 0x50 0x70 0x90 0xB0 0xD0 0xF0 0x110 \
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0x130 0x150 0x170 0x190 0x1B0 0x1D0 0x1F0>;
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channel@0 {
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reg = <0x0>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@1 {
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reg = <1>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@2 {
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reg = <2>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@3 {
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reg = <3>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@4 {
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reg = <4>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@5 {
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reg = <5>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@6 {
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reg = <6>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@7 {
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reg = <7>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@8 {
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reg = <8>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@9 {
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reg = <9>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@a {
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reg = <0xa>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@b {
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reg = <0xb>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@c {
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reg = <0xc>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@d {
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reg = <0xd>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@e {
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reg = <0xe>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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channel@f {
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reg = <0xf>;
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zephyr,gain = "ADC_GAIN_1";
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zephyr,reference = "ADC_REF_EXTERNAL0";
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zephyr,vref-mv = <8>;
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zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
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};
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};
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};

‎samples/drivers/adc/adc_sequence/sample.yaml

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- nrf54h20dk/nrf54h20/cpuapp
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- ucans32k1sic
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- frdm_mcxc242
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- stm32f3_disco
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integration_platforms:
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- nrf52840dk/nrf52840
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harness: console

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

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{
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int err;
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uint32_t count = 0;
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#ifdef CONFIG_SEQUENCE_32BITS_REGISTERS
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uint32_t channel_reading[CONFIG_SEQUENCE_SAMPLES][CHANNEL_COUNT];
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#else
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uint16_t channel_reading[CONFIG_SEQUENCE_SAMPLES][CHANNEL_COUNT];
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#endif
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/* Options for the sequence sampling. */
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const struct adc_sequence_options options = {

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