embedded-sps

This repository contains the embedded i2c driver sources for Sensirion's SPS product line.

If you just want to use the driver, it is recommended to download the release zip from https://github.com/Sensirion/embedded-sps/releases

The UART driver of the SPS is available in the embedded-uart-sps repository.

Arduino (i2c): https://github.com/Sensirion/arduino-sps

Clone this repository

git clone --recursive https://github.com/Sensirion/embedded-sps.git

Repository content

• embedded-common submodule repository for common HAL
• sps30-i2c SPS30 i2c driver

Hardware setup

• Make sure that the SPS30's Pin 4 ("Interface select") is connected to GND, on power-up of the sensor, otherwise the sensor works in UART instead of i2c mode. Note that the interface-select configuration is read on every start of the sensor including after a soft-reset.

• The i2c wires need appropriate pull-up resistors if they're not included or enabled in your microprocessor.

Collecting resources

make release

This will create a release folder with the necessary driver files in it, including a Makefile. That way, you have just ONE folder with all the sources ready to build your driver for your platform.

Files to adjust (from embedded-common)

To adapt the driver to your platform, you only need to touch the following

• sensirion_arch_config.h (architecture specifics, you need to specify the integer sizes if your compiler toolchain does not provide stdint.h)

and depending on your i2c implementation either of the following:

• embedded-common/hw_i2c/sensirion_hw_i2c_implementation.c functions for hardware i2c communication if your platform has a dedicated I2C controller.
• embedded-common/sw_i2c/sensirion_sw_i2c_implementation.c functions for software i2c communication if your platform does not have a dedicated I2C controller and communication happens with GPIOs. In this case you need to make sure that appropriate I2C pull-up resistors are used.

Building the driver

1. Adjust sensirion_arch_config.h if you don't have the <stdint.h> header file available.

2. Either use one of the provided sample implementations implement necessary functions in one of the *_implementation.c files described above (either in the hw_i2c or sw_i2c folder).

   To reuse a provided sample implementation you can specify it in a custom build configuration. For this adapt the file user_config.inc in the driver:

   user_config.inc for hardware i2c with dedicated i2c controller:

   CONFIG_I2C_TYPE=hw_i2c
   hw_i2c_impl_src = ${embedded-common}/hw_i2c/sample-implementations/linux_user_space/sensirion_hw_i2c_implementation.c

   user_config.inc for software i2c with bit-banging on GPIOs:

   CONFIG_I2C_TYPE=sw_i2c
   sw_i2c_impl_src = ${embedded-common}/sw_i2c/sample-implementations/linux_user_space/sensirion_sw_i2c_implementation.c

3. Run make

4. Run the compiled example usage with ./sps30_example_usage. Note that hardware access permissions (e.g. sudo) might be needed.

Please check the embedded-common repository for further information and sample implementations.