Lup Yuen Lee 李立源 @lupyuen@qoto.org

RIOT OS powered balloon with #LoRaWAN sensors

https://www.hackster.io/project-riot-20-21-team-miniloon-haw-hamburg/miniloon-60a9c9

Let's test #BME280 SPI with #BusPirate

...And why did the #PineCone #BL602 WiFi Light (top LED) switch on? 🤔

Aha #BL602 SPI DMA is now Transmitting AND Receiving! The SPI Mode was incorrect ... Got confused between the AliOS docs and the BL602 implementation 🙁

Received SPI Data is garbage though 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/spi/customer_app/sdk_app_spi/sdk_app_spi/demo.c#L49-L67

#BL602 SPI DMA uses a Linked List of DMA requests ... Let's dump the DMA Linked List and verify the SPI Transmit and Receive requests

https://github.com/lupyuen/bl_iot_sdk/blob/spi/components/hal_drv/bl602_hal/hal_spi.c#L160-L199

#BL602 SPI Transmit seems OK but not SPI Receive ... After calling "hal_spi_init" 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/spi/components/hal_drv/bl602_hal/hal_spi.c#L826-L876

LinBits 30: Weekly #Linux Phone news

https://linmob.net/2021/01/31/linbits30-weekly-linux-phone-news-week4.html

What is #OpenSource?

https://openeveryone.substack.com/p/what-is-open-source

Building a microcluster with RockPro64

https://mattbernhard.medium.com/building-a-microcluster-812b176e2f76

These 2 #BL602 SPI Functions are begging me to call them ... Phew this SPI HAL is confusing 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/spi/components/hal_drv/bl602_hal/hal_spi.c#L405

How Singapore Street Food got recognized as UNESCO treasure

https://www.nationalgeographic.com/travel/2021/01/why-unesco-is-honoring-singapore-street-food/

500 #Sourdough Starters from 4 continents yield surprises

https://www.futurity.org/sourdough-starters-yeast-bread-microbes-2507252-2/

Commented out the waiting for #BL602 SPI DMA ... Yep no more hanging ... But no SPI Data received. Interrupt Counters show that DMA Interrupts weren't triggered.

The plot thickens ... Just like my chicken soup 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/spi/components/hal_drv/bl602_hal/hal_spi.c#L285-L353

Chicken Soup with Daikon

"hal_spi_dma_trans" hangs while doing #BL602 SPI DMA transfer because it's waiting for a FreeRTOS Event Group ... Which is supposed to be signalled by the DMA Interrupt Handler. Let's comment out the waiting and see what happens...

https://github.com/lupyuen/bl_iot_sdk/blob/spi/components/hal_drv/bl602_hal/hal_spi.c#L285-L348

#BL602 SPI DMA Transfer is hanging inside "hal_spi_dma_trans" ... According to the debug log 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/spi/components/hal_drv/bl602_hal/hal_spi.c#L472-L510

Uncanny...