Lup Yuen Lee 李立源 @lupyuen@qoto.org

Our #NuttX App runs OK on PineDio Stack BL604 with onboard SX1262! 🎉

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test2/spi_test2_main.c

Here are the #NuttX Pin Definitions for PineDio Stack BL604 with onboard SX1262 ... As derived from the schematic

https://github.com/lupyuen/incubator-nuttx/blob/pinedio/boards/risc-v/bl602/bl602evb/include/board.h#L42-L95

Here's how Semtech SX1262 is wired onboard #PineDio Stack #BL604 ... Let's update the Pin Definitions in NuttX

Will #NuttX run on #Pine64's PineDio Stack BL604 with onboard Semtech SX1262? Let's find out!

https://lupyuen.github.io/articles/pinedio

Our #NuttX App now reads the SX1262 Register correctly! 🎉

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test2/spi_test2_main.c

BL602 vs ESP32 🤔

For #NuttX on #BL602, we use SPI Mode 1 instead of Mode 0 ... To work around the SPI Mode Quirk

https://github.com/lupyuen/incubator-nuttx/blob/spi_test/drivers/rf/spi_test_driver.c#L51-L57

Let's use an NB-IoT Antenna ... As the #LoRa Antenna for #PineDio Stack BL604 @PINE64 ... For now

https://lupyuen.github.io/articles/pinedio

#BL602 has an SPI Quirk ... We must use SPI Mode 1 instead of Mode 0 ... Let's fix this in #NuttX

https://lupyuen.github.io/articles/spi#spi-phase-looks-sus

Our #NuttX App reads an SX1262 Register ... But it returns garbage! There's a workaround for this #BL602 SPI Quirk

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test2/spi_test2_main.c#L90-L119

Now our #NuttX App is ready to read an SX1262 Register over SPI!

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test2/spi_test2_main.c#L90-L119

Here's our #NuttX App controlling SPI Chip Select via GPIO

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test2/spi_test2_main.c#L42-L74

#BL602 SPI Chip Select has a problem ... It goes High after EVERY byte ... Which is no-no for SX1262 ... Solution: We control Chip Select via GPIO

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test2/spi_test2_main.c#L42-L74

Our #NuttX App transmits an SPI Command to SX1262 ... And reads the SPI Response from SX1262

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test2/spi_test2_main.c#L54-L84

We implement the Read Operation for our #NuttX SPI Driver ... So that we can fetch the SPI Response from SX1262

https://github.com/lupyuen/incubator-nuttx/blob/spi_test/drivers/rf/spi_test_driver.c#L210-L233

Let's test #NuttX SPI with #BL602 and Semtech SX1262 LoRa Transceiver

https://www.semtech.com/products/wireless-rf/lora-core/sx1262

After swapping #BL602 MISO and MOSI at #NuttX startup ... Logic Analyser shows that the SPI Pins are now consistent with BL602 Reference Manual! 🎉

https://github.com/lupyuen/incubator-nuttx/blob/swap_miso_mosi/arch/risc-v/src/bl602/bl602_spi.c#L1080-L1140

Here's how we swap #BL602 MOSI and MISO on #NuttX ... So that the SPI Pins are consistent with the BL602 Reference Manual

https://github.com/lupyuen/incubator-nuttx/blob/swap_miso_mosi/arch/risc-v/src/bl602/bl602_spi.c#L1080-L1140

Yep it works fine with #BL602 Firmware 👍

#PineDio Stack #BL604 now comes with an interesting Baseboard 🤔