Another #BL602 trap! "vfs_spi_init_fullname" doesn't return the SPI Device ... It passes the SPI Device to AliOS! Let's create our own function to init the SPI Port without AliOS 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/spi/components/hal_drv/bl602_hal/hal_spi.c#L504-L571

Init #BL602 SPI Port ... No more traps!

https://github.com/lupyuen/bl_iot_sdk/blob/spi/customer_app/sdk_app_spi/sdk_app_spi/demo.c#L42-L69

#BL602 SPI Data Transfer needs a "void *" parameter ... Which is cast to an "spi_ioc_transfer_t" ... That belongs to AliOS 😭

https://github.com/lupyuen/bl_iot_sdk/blob/spi/components/hal_drv/bl602_hal/hal_spi.c#L464-L502

Saturday night with my lovelies ... #PineCone #RISCV #BL602 @PINE64 and BME280 ... Now connecting SPI

Hope #BL602 SPI is wired correctly to #BME280 🤔

Good Sunday Morning #PineCone #BL602 @PINE64 ... And #BME280 on SPI! Yep this looks right 👍

https://github.com/lupyuen/bl_iot_sdk/blob/spi/customer_app/sdk_app_spi/sdk_app_spi/demo.c#L49-L70

#BL602 SPI Transmit and Receive ... Hope this works 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/spi/customer_app/sdk_app_spi/sdk_app_spi/demo.c#L72-L102

Our #BL602 SPI program hangs when doing data transfer 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/spi/customer_app/sdk_app_spi/sdk_app_spi/demo.c

#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

"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

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

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

#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

#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

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

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

Let's test #BME280 SPI with #BusPirate

#BME280 SPI tests OK with #BusPirate

https://github.com/lupyuen/bl_iot_sdk/blob/spi/customer_app/sdk_app_spi/sdk_app_spi/demo.c#L157-L219

Contemplating my Life Choices ... Erm whether I should use #BusPirate to sniff the #BL602 SPI Bus 🤔

http://dangerousprototypes.com/docs/SPI#SPI_Bus_sniffer

Potential Bug in #BL602 SPI HAL

https://github.com/bouffalolab/bl_iot_sdk/blob/master/components/hal_drv/bl602_hal/hal_spi.c#L243

...Or use a real Logic Analyser ... To debug the #BL602 SPI Bus? 🤔

https://www.seeedstudio.com/LA2016-Logic-Analyzer-p-2218.html

#PineCone and #Pinenut #BL602 recommended SPI Pins ... Let's try them

https://wiki.pine64.org/wiki/Nutcracker#Pinenut-12S_Module_information

Testing the Recommended SPI Pins for #BL602 #PineCone @ThePine64

https://wiki.pine64.org/wiki/Nutcracker#Pinenut-12S_Module_information

Nope Recommended SPI Pins for #PineCone #BL602 also don't work

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

...But now we get pretty Blue and Red Lights on #PineCone #BL602! 🤩 Time to do the SPI Protocol Analyser ... My first time ever!

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

Test the Logic Analyser with #BusPirate ... Before connecting to #BL602 and BME280

http://www.qdkingst.com/en/download

Logic Analyser connected to #BusPirate and #BME280 ... Hope this works 🤔

http://www.qdkingst.com/en/download

Logic Analyser captures SPI Data between #BusPirate and #BME280 ... So cool! 🤩 Now to capture #BL602 + BME280 and compare

http://www.qdkingst.com/en/download

#PineCone #BL602 @ThePine64 connected to BME280 and LA2016 Logic Analyser ... Let's sniff the SPI Bus and find out what's wrong!

#BL602 SPI Data Pins seem to be flipped ... Based on SPI data sniffed by Logic Analyser 🤔

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

Let's try 2 #BL602 SPI Transfers instead of 1 ... First SPI Transfer transmits Register ID ... Second SPI Transfer receives the result from BME280

https://github.com/lupyuen/bl_iot_sdk/blob/spi/customer_app/sdk_app_spi/sdk_app_spi/demo.c#L70-L114

Nope #BL602 still receiving garbage from BME280 ... Let's do the #SPI Logic Analyser!

https://github.com/lupyuen/bl_iot_sdk/blob/spi/customer_app/sdk_app_spi/sdk_app_spi/demo.c#L70-L114

LA2016 Logic Analyser comes in this beautiful inspirational box ... "Embedded Development Kit: Innovative concept, win-win cooperation"

Ugh #BL602 is disrupting the two SPI Transfers ... By setting the Chip Enable Pin high ... Let's control Chip Enable Pin ourselves with GPIO

https://github.com/lupyuen/bl_iot_sdk/blob/spi/customer_app/sdk_app_spi/sdk_app_spi/demo.c#L70-L114

Thankfully #BL602 SPI HAL lets us use GPIO to control the Chip Select Pin ... But we have already configured the pin for SPI Function ... Will this conflict with the GPIO Function? 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/spi/components/hal_drv/bl602_hal/hal_spi.c#L479-L519

Nope #BL602 #SPI HAL can't control Chip Select Pin by #GPIO ... Because it has already configured the pin for SPI Port earlier ... Let's control the pin ourselves 👋

https://github.com/lupyuen/bl_iot_sdk/blob/spi/components/hal_drv/bl602_hal/hal_spi.c#L98-L122

Here's how we control #BL602 #SPI Chip Select Pin ourselves ... Using plain old BL602 GPIO

https://github.com/lupyuen/bl_iot_sdk/blob/spi/customer_app/sdk_app_spi/sdk_app_spi/demo.c#L47-L128

Why does BME280 return different results ... For Bus Pirate vs #BL602? 🤔