Here are the Pin Definitions for #BL602 #NuttX ... We'll change this in a while

https://github.com/apache/incubator-nuttx/blob/master/boards/risc-v/bl602/bl602evb/include/board.h

Let's enable the "help" and "ls" Shell Commands in #BL602 #NuttX

https://nuttx.apache.org/docs/latest/quickstart/configuring.html

Let's test GPIO on #BL602 #NuttX ... By enabling the GPIO Driver

https://nuttx.apache.org/docs/latest/quickstart/configuring.html

After the GPIO Driver has been enabled, select the GPIO Demo in #BL602 #NuttX

https://nuttx.apache.org/docs/latest/quickstart/configuring.html

"help" shows the commands available on #BL602 #NuttX ... "ls /dev" reveals the GPIO Pins that we may control ... Yep everything looks like a file!

https://acassis.wordpress.com/2021/01/24/how-to-install-nuttx-on-bl602/

GPIO Demo calls "ioctl" to control the GPIO Pins on #BL602 #NuttX

https://github.com/apache/incubator-nuttx-apps/blob/master/examples/gpio/gpio_main.c

How shall we flip GPIO 11, the Blue LED on PineCone #BL602? We edit the #NuttX GPIO Pin Definition ... And GPIO 11 becomes "/dev/gpout1"

https://github.com/lupyuen/incubator-nuttx/blob/master/boards/risc-v/bl602/bl602evb/include/board.h#L45-L53

Flipping GPIO 11 doesn't blink the LED on #BL602 #NuttX ... Let's investigate 🤔

https://github.com/lupyuen/incubator-nuttx/blob/master/boards/risc-v/bl602/bl602evb/include/board.h#L45-L53

#NuttX writes correctly to the GPIO 11 Output Register at 0x40000188 (BL602_GPIO_CFGCTL32)

https://github.com/apache/incubator-nuttx/blob/master/arch/risc-v/src/bl602/bl602_gpio.c#L190-L209

#NuttX configures #BL602 GPIO 11 (0x40000114) with GPIO Input Disabled ... But it doesn't Enable GPIO Output 🤔

https://github.com/apache/incubator-nuttx/blob/master/arch/risc-v/src/bl602/bl602_gpio.c#L59-L133

#BL602 Reference Manual says we should set the GPIO Output Enable Register ... But it's missing from the docs ... Where is the register? 🤔

https://github.com/bouffalolab/bl_docs/tree/main/BL602_RM/en

#BL602 IoT SDK says that GPIO Output Enable Register is at 0x40000190 (GLB_GPIO_CFGCTL34) ... Let's set this register in #NuttX

https://github.com/lupyuen/bl_iot_sdk/blob/master/components/bl602/bl602_std/bl602_std/StdDriver/Src/bl602_glb.c#L1990-L2010

We mod #BL602 #NuttX to set the GPIO Output Enable Register at 0x40000190 (BL602_GPIO_CFGCTL34)

https://github.com/lupyuen/incubator-nuttx/pull/1/files

After fixing GPIO Output, #NuttX now blinks the Blue LED (GPIO 11) on PineCone #BL602! 🎉

https://github.com/lupyuen/incubator-nuttx/pull/1/files

Blinking the #BL602 LED ... Works on #NuttX BASIC too! 🎉

https://github.com/lupyuen/incubator-nuttx-apps/tree/master/interpreters/bas

As we've seen, #NuttX has its own HAL for #BL602 ... Which differs from BL602 IoT SDK ... So we expect some quirks

https://github.com/apache/incubator-nuttx/tree/master/arch/risc-v/src/bl602

Testing Apache #NuttX OS on #RISCV #BL602 and BL604 ... All shall be explained in this article

https://lupyuen.github.io/articles/nuttx?1

How we build Apache #NuttX OS for #BL602 and BL604

https://lupyuen.github.io/articles/nuttx?2#build-nuttx

Booting #NuttX OS on #BL602 and BL604

https://lupyuen.github.io/articles/nuttx?3#boot-nuttx

"Hello World" on #BL602 #NuttX ... Looks just like Linux!

https://lupyuen.github.io/articles/nuttx?4#hello-demo

Accessing the System Timer on #NuttX #BL602 ... Everything is a file!

https://lupyuen.github.io/articles/nuttx?5#timer-demo

How we configure the #NuttX Build for #BL602

https://lupyuen.github.io/articles/nuttx?6#configure-nuttx

How we enable "help" and "ls" in #NuttX #BL602

https://lupyuen.github.io/articles/nuttx?7#enable-help-and-ls

Enabling the GPIO Driver for #NuttX #BL602

https://lupyuen.github.io/articles/nuttx?8#enable-gpio-driver

Finally we enable the GPIO Demo App for #BL602 #NuttX

https://lupyuen.github.io/articles/nuttx?9#enable-gpio-demo

Here are the Hardware Devices on #BL602 #NuttX

https://lupyuen.github.io/articles/nuttx?10#gpio-demo

Setting the GPIO Output on #BL602 #NuttX

https://lupyuen.github.io/articles/nuttx?11#write-to-gpio

Here's how we configure the Pin Numbers for #BL602 #NuttX

https://lupyuen.github.io/articles/nuttx?12#configure-pins

There's a glitch in the #NuttX #BL602 GPIO Driver ... Will submit a PR shortly 👍

https://lupyuen.github.io/articles/nuttx?15#gpio-glitch

Blinking the LED on PineCone #BL602 @PINE64 with #NuttX OS

https://lupyuen.github.io/articles/nuttx?16#test-the-led

What's inside the #NuttX GPIO Driver

https://lupyuen.github.io/articles/nuttx?17#gpio-driver

GPIO Interface and Board-Specific Drivers for #NuttX #BL602

https://lupyuen.github.io/articles/nuttx?18#gpio-interface

#BL602 GPIO Driver for #NuttX OS

https://lupyuen.github.io/articles/nuttx?19#bl602-driver

BASIC Interpreter on #BL602 #NuttX 🥲

https://lupyuen.github.io/articles/nuttx?20#basic-interpreter

"Peek" and "Poke" will Blink the LED ... On #BL602 #NuttX

https://lupyuen.github.io/articles/nuttx?21#blink-the-led

Why use Apache #NuttX OS on #BL602 and BL604?

https://lupyuen.github.io/articles/nuttx?22#why-nuttx

#RustLang on Apache #NuttX OS? Might be possible! 🤔

https://lupyuen.github.io/articles/nuttx?23#rust-on-nuttx

#NuttX PR that fixes GPIO Output on #BL602 and BL604

https://github.com/apache/incubator-nuttx/pull/4875