Release notes: https://techcommunity.microsoft.com/t5/Internet-of-Things/Azure-Sphere-19-09-release-is-live-in-Retail-feed/ba-p/898221
Key things from my point of view:
- Enables PWM and ADC peripherals for use on the high-level core
- I2C and SPI APIs promoted from Beta to LTS
Your device should update automatically. Use "azsphere device show-ota-status" to check.
I think you need to download and reinstall the SDK on your PC to pick up the changes. Then you'll see Target API Set options of "1, 2, 3, 3+Beta1919".
