Hello Zephyr Community,
I am trying to contribute a new sensor driver for the **AMS AS7341 Spectral Sensor** to Zephyr (using **NCS v3.2.2 / Zephyr**), and I would appreciate some guidance regarding CI/Twister failures during the contribution process.
## Environment
* NCS Version: **v3.2.2**
* Target Hardware: **nRF9151**
* Driver: **AMS AS7341 Spectral Sensor**
* Driver implemented using Zephyr Sensor API:
* `sample_fetch()`
* `channel_get()`
* `attr_set()`
* `attr_get()`
* Trigger support APIs
## Driver Integration
I added the driver under:
```text
zephyr/drivers/sensor/ams/ams_as7341/
```
Files:
```text
ams_as7341.c
ams_as7341.h
Kconfig
CMakeLists.txt
```
I also updated:
```text
zephyr/drivers/sensor/ams/Kconfig
zephyr/drivers/sensor/ams/CMakeLists.txt
```
to include the new driver.
---
## Devicetree Binding
Added:
```text
zephyr/dts/bindings/sensor/ams,as7341.yaml
```
Content:
```yaml
# Copyright (c) 2026 Dotcom IoT LLP
# SPDX-License-Identifier: Apache-2.0
description: AMS AS7341 spectral sensor
compatible: "ams,as7341"
include:
- sensor-device.yaml
- i2c-device.yaml
```
---
## Twister Test
Created:
```text
zephyr/tests/drivers/sensor/ams_as7341/
```
Files:
### src/main.c
```c
#include <zephyr/ztest.h>
#include <zephyr/drivers/sensor.h>
ZTEST_SUITE(ams_as7341_tests, NULL, NULL, NULL, NULL, NULL);
ZTEST(ams_as7341_tests, test_basic_assertions)
{
zassert_true(1, "basic assertion failed");
}
```
### CMakeLists.txt
```cmake
cmake_minimum_required(VERSION 3.20.0)
find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
project(ams_as7341_test)
FILE(GLOB app_sources src/*.c)
target_sources(app PRIVATE ${app_sources})
```
### prj.conf
```conf
CONFIG_ZTEST=y
CONFIG_SENSOR=y
CONFIG_I2C=y
CONFIG_AMS_AS7341=y
```
### testcase.yaml
```yaml
tests:
drivers.sensor.ams_as7341:
tags:
- drivers
- sensor
platform_allow:
- native_sim
integration_platforms:
- native_sim
harness: ztest
```
---
## Local Validation
### Twister
Executed:
```bash
export ZEPHYR_TOOLCHAIN_VARIANT=zephyr
export ZEPHYR_SDK_INSTALL_DIR=/home/dnk133/ncs/toolchains/927563c840/opt/zephyr-sdk
~/ncs/v3.2.2/zephyr/scripts/twister \
-T tests/drivers/sensor/ams_as7341 \
-p native_sim \
-v
```
Result:
```text
PASS
```
### Checkpatch
Executed:
```bash
./scripts/checkpatch.pl --file drivers/sensor/ams/ams_as7341/ams_as7341.c
./scripts/checkpatch.pl --file drivers/sensor/ams/ams_as7341/ams_as7341.h
./scripts/checkpatch.pl --file drivers/sensor/ams/ams_as7341/Kconfig
./scripts/checkpatch.pl --file drivers/sensor/ams/ams_as7341/CMakeLists.txt
./scripts/checkpatch.pl --file dts/bindings/sensor/ams,as7341.yaml
```
Result:
```text
No checkpatch errors reported
```
---
## CI Failure
However, after creating the pull request, CI fails during the Twister build stage.
From the CI log, I see errors similar to:
```text
error: as7341_init defined but not used [-Werror=unused-function]
```
and multiple failures such as:
```text
drivers.sensor.generic_test
drivers.sensor.no_default
drivers.sensor.pm
drivers.sensor.trigger.own
```
The failure seems to occur on the **native_sim/native** build configurations.
Screenshot attached below for reference.
--- 
## My Questions
1. Why does the driver pass local Twister testing but fail in Zephyr CI?
2. Is `as7341_init()` expected to be conditionally compiled using a DT_INST macro?
3. Could the failure be caused by:
* Missing `DT_INST_FOREACH_STATUS_OKAY()` usage?
* Missing device instantiation macros?
* Missing Kconfig dependencies?
* Driver being compiled even when no AS7341 instance exists in the build?
4. Are there additional sensor-driver tests that must be added beyond a simple ZTest application?
5. Is there any recommended checklist for contributing a new sensor driver to Zephyr/NCS?
Any suggestions on what I should inspect next would be greatly appreciated.
Thank you for your time and guidance.
Best Regards,
**Parin Baudhanwala**
Embedded Firmware Developer
Dotcom IoT LLP