Here's how we patch the #NuttX BMP280 Driver to send the Register ID as I2C Sub Address (instead of I2C Data)
#NuttX BMP280 Driver loads OK on #BL602 ... After setting the Register ID as I2C Sub Address! 🎉
https://github.com/lupyuen/bme280-nuttx#bmp280-driver-loads-ok
#NuttX BMP280 Driver appears as "/dev/sensor/baro0" ... Let's read the device
https://github.com/lupyuen/bme280-nuttx#bmp280-driver-loads-ok
We enable the #NuttX Sensor Test App ... To test the BMP280 Driver
#NuttX BMP280 Driver says it's 29 °C with air pressure 1,006 millibars ... Yep looks right for Sunny Singapore by the Seaside 👍
#NuttX BMP280 Driver works OK with our BME280 Sensor ... But we're missing one thing: Humidity ... Can we port the BME280 Driver from Zephyr OS? 🤔
https://github.com/lupyuen/bme280-nuttx#port-bme280-driver-from-zephyr-os
Zephyr BME280 Driver looks similar to #NuttX BMP280 Driver ... So porting Zephyr BME280 Driver to NuttX might not be so hard 🤔
https://github.com/lupyuen/bme280-nuttx#port-bme280-driver-from-zephyr-os
Zephyr BME280 Driver builds OK on #NuttX (with a few tweaks) 🎉 ... Now we wrap the Zephyr Driver as a NuttX Driver
https://github.com/lupyuen/bme280-nuttx#wrap-zephyr-driver-as-nuttx-driver
Our #NuttX Driver Wrapper wraps around the Zephyr BME280 Driver ... So it works like a NuttX Driver
https://github.com/lupyuen/bme280-nuttx#wrap-zephyr-driver-as-nuttx-driver
Our #NuttX BME280 Driver reads the Sensor Data from Zephyr Driver in two steps: 1️⃣ Fetch the sensor sample 2️⃣ Get the channel data
https://github.com/lupyuen/bme280-nuttx#read-sensor-data-from-zephyr-driver
Power Management works a little differently in #NuttX vs Zephyr ... Here's how our NuttX BME280 Driver calls the Zephyr Driver to do Power Management
BME280 Standby Duration is static in Zephyr but configured at runtime in #NuttX ... So we set it in our NuttX BME280 Driver
Zephyr BME280 Driver ported to Apache #NuttX OS ... Works great on NuttX! 🎉
We made minimal changes to Zephyr BME280 Driver while porting to #NuttX OS
https://github.com/lupyuen/bme280-nuttx#zephyr-driver-modified-for-nuttx
#NuttX doesn't have a Sensor Type that supports BME280 Temperature + Humidity + Pressure ... So our NuttX BME280 Driver combines 2 Sensor Types: 1️⃣ Barometer Sensor (Pressure + Temperature) 2️⃣ Humidity Sensor
https://github.com/lupyuen/bme280-nuttx#combined-barometer-and-humidity-sensor
Each #NuttX Sensor defines its operations for 1️⃣ Activating the sensor 2️⃣ Fetching sensor data 3️⃣ Setting the standby interval
https://github.com/lupyuen/bme280-nuttx#combined-barometer-and-humidity-sensor
At #NuttX Startup we register both BME280 sensors: Barometer Sensor and Humidity Sensor
https://github.com/lupyuen/bme280-nuttx#combined-barometer-and-humidity-sensor
Our #NuttX BME280 Driver appears as 2 sensors: 1️⃣ "/dev/sensor/baro0" (Barometer Sensor) 2️⃣ "/dev/sensor/humi0" (Humidity Sensor) ... Here's how we read the Air Pressure, Temperature and Humidity
https://github.com/lupyuen/bme280-nuttx#combined-barometer-and-humidity-sensor
Here's how we connect BME280 Sensor (Temperature / Humidity / Air Pressure) ... To PineCone #BL602 @PINE64
https://lupyuen.github.io/articles/bme280?2#test-and-connect-bme280
Apache #NuttX OS doesn't have a BME280 Driver ... Let's tweak the BMP280 Driver to work with BME280
https://lupyuen.github.io/articles/bme280?3#start-with-bmp280-driver
Apache #NuttX Driver for BMP280 fails to load on #BL602 ... Let's fix this 🤔
https://lupyuen.github.io/articles/bme280?4#invalid-device-id
#BL602 has a peculiar I2C Port ... It uses I2C Sub Addresses! Here's how we fix our #NuttX Driver
https://lupyuen.github.io/articles/bme280?5#set-i2c-sub-address
Here's how we read the BMP280 Sensor on Apache #NuttX OS ... With the Sensor Test App
https://lupyuen.github.io/articles/bme280?6#run-sensor-test-app
Here's why we port the BME280 Driver from Zephyr OS to Apache #NuttX OS
https://lupyuen.github.io/articles/bme280?7#port-bme280-driver-from-zephyr-os
Mapping the BME280 Driver from Zephyr OS to Apache #NuttX OS
How our #NuttX BME280 Driver reads the Sensor Data from Zephyr BME280 Driver
https://lupyuen.github.io/articles/bme280?9#read-sensor-data-from-zephyr-driver
BME280 Standby Interval is configured by #NuttX at runtime ... Here's how we do it
https://lupyuen.github.io/articles/bme280?10#standby-interval
Our #NuttX BME280 Driver combines 2 sensors ... Here's why
https://lupyuen.github.io/articles/bme280?11#combined-barometer-and-humidity-sensor
Our #NuttX BME280 Driver defines the operations for the Barometer and Humidity Sensors
https://lupyuen.github.io/articles/bme280?12#sensor-operations
Our #NuttX BME280 Driver registers the Barometer and Humidity Sensors at startup
https://lupyuen.github.io/articles/bme280?15#register-sensors
Here's how we bundle the Zephyr BME280 Driver inside our #NuttX Driver
https://lupyuen.github.io/articles/bme280?16#bundle-nuttx-and-zephyr-drivers
What's inside our bundled BME280 Driver for #NuttX OS
https://lupyuen.github.io/articles/bme280?17#inside-the-bundle
How we minimised the changes when porting the Zephyr BME280 Driver to #NuttX OS
https://lupyuen.github.io/articles/bme280?18#zephyr-driver-modified-for-nuttx
Here's how we read the BME280 Sensor with #NuttX Sensor Test App
https://lupyuen.github.io/articles/bme280?19#run-bme280-driver
What's inside the #NuttX Sensor Test App
https://lupyuen.github.io/articles/bme280?20#sensor-test-app
#BL602 I2C Driver for Apache #NuttX RTOS ... Works in mysterious ways 🤔
https://lupyuen.github.io/articles/bme280?88#appendix-quirks-in-bl602-nuttx-i2c-driver
