RISC-V GAP¶

Configuration:: platform = riscv_gap

GreenWaves GAP8 IoT application processor enables the cost-effective development, deployment and autonomous operation of intelligent sensing devices that capture, analyze, classify and act on the fusion of rich data sources such as images, sounds or vibrations.

For more detailed information please visit vendor site.

Configuration ¶

Drivers ¶

See “Drivers” section for FTDI Chip debug probe.

Running modes ¶

GAPuino supports 2 main modes:

Running from RAM, boot_mode=jtag
Running from HyperFlash, boot_mode=jtag_hyper

A running process can be controlled through the internal upload commands:

load, @TODO
reqloop, @TODO
ioloop, @TODO
start, @TODO
wait, @TODO

You can configure “boot mode” and list of upload commands using “platformio.ini” (Project Configuration File). Default values are:

board_upload.boot_mode = jtag
board_upload.commands = load reqloop ioloop start wait

Run from RAM ¶

This is a default behavior when you run “Upload” task in PlatformIO IDE or use PlatformIO Core (CLI) and platformio run --target command with upload target.

Run from RAM (without any bridge interaction)¶

Configure build environment using “platformio.ini” (Project Configuration File) as described below

[env:gapuino]
platform = riscv_gap
board = gapuino
framework = ...
board_upload.commands = load start

Run “Upload” task in PlatformIO IDE or use PlatformIO Core (CLI) and platformio run --target command with upload target.

Flash and run from RAM ¶

The same as Uploading files to HyperFlash.

Flash and run from Flash ¶

Configure build environment using “platformio.ini” (Project Configuration File) as described below

[env:gapuino]
platform = riscv_gap
board = gapuino
framework = ...
board_upload.boot_mode = jtag_hyper
board_upload.commands = reqloop ioloop start wait

Perform Uploading files to HyperFlash.

Run from Flash ¶

Note

You have to perform Uploading files to HyperFlash before.

Configure build environment using “platformio.ini” (Project Configuration File) as described below

[env:gapuino]
platform = riscv_gap
board = gapuino
framework = ...
board_upload.boot_mode = jtag_hyper
board_upload.commands = reqloop ioloop start wait

Run “Upload” task in PlatformIO IDE or use PlatformIO Core (CLI) and platformio run --target command with upload target.

Run from Flash (without any bridge interaction)¶

Note

You have to perform Uploading files to HyperFlash before.

Configure build environment using “platformio.ini” (Project Configuration File) as described below

[env:gapuino]
platform = riscv_gap
board = gapuino
framework = ...
board_upload.boot_mode = jtag_hyper
board_upload.commands = start

Run “Upload” task in PlatformIO IDE or use PlatformIO Core (CLI) and platformio run --target command with upload target.

Uploading files to HyperFlash ¶

Create new project using PlatformIO IDE or initialize project using PlatformIO Core (CLI) and platformio init (if you have not initialized it yet)
Create data folder (it should be on the same level as src folder) and put files here. Also, you can specify own location for data_dir
Run “Upload File System image” task in PlatformIO IDE or use PlatformIO Core (CLI) and platformio run --target command with uploadfs target.

Examples:

PULP OS File System

Examples ¶

Examples are listed from RISC-V GAP development platform repository:

Debugging ¶

PIO Unified Debugger - “1-click” solution for debugging with a zero configuration.

Tools & Debug Probes ¶

Supported debugging tools are listed in “Debug” column. For more detailed information, please scroll table by horizontal. You can switch between debugging Tools & Debug Probes using debug_tool option in “platformio.ini” (Project Configuration File).

Warning

You will need to install debug tool drivers depending on your system. Please click on compatible debug tool below for the further instructions.

On-Board Debug Tools ¶

Boards listed below have on-board debug probe and ARE READY for debugging! You do not need to use/buy external debug probe.

Name	MCU	Frequency	Flash	RAM
GAPuino GAP8	GAP8	250MHz	64MB	8MB

Stable and upstream versions ¶

You can switch between stable releases of RISC-V GAP development platform and the latest upstream version using platform option in “platformio.ini” (Project Configuration File) as described below.

Stable¶

; Latest stable version
[env:latest_stable]
platform = riscv_gap
board = ...

; Custom stable version
[env:custom_stable]
platform = riscv_gap@x.y.z
board = ...

Upstream¶

[env:upstream_develop]
platform = https://github.com/pioplus/platform-riscv_gap.git
board = ...

Packages ¶

Name	Description
framework-gap_sdk	The GAP8 SDK allows you to compile and execute applications on the GAP8 IoT Application Processor.
tool-pulp_tools	Top project for building PULP development tools
toolchain-riscv-pulp	RISC-V GCC toolchain for PULP platform

Warning

Linux Users:

Install “udev” rules 99-platformio-udev.rules

Raspberry Pi users, please read this article Enable serial port on Raspberry Pi.

Windows Users:

Please check that you have a correctly installed USB driver from board manufacturer

Frameworks ¶

Name	Description
mbed	The mbed framework The mbed SDK has been designed to provide enough hardware abstraction to be intuitive and concise, yet powerful enough to build complex projects. It is built on the low-level ARM CMSIS APIs, allowing you to code down to the metal if needed. In addition to RTOS, USB and Networking libraries, a cookbook of hundreds of reusable peripheral and module libraries have been built on top of the SDK by the mbed Developer Community.
PULP OS	PULP is a silicon-proven Parallel Ultra Low Power platform targeting high energy efficiencies. The platform is organized in clusters of RISC-V cores that share a tightly-coupled data memory.

Name

Description

mbed

The mbed framework The mbed SDK has been designed to provide enough hardware abstraction to be intuitive and concise, yet powerful enough to build complex projects. It is built on the low-level ARM CMSIS APIs, allowing you to code down to the metal if needed. In addition to RTOS, USB and Networking libraries, a cookbook of hundreds of reusable peripheral and module libraries have been built on top of the SDK by the mbed Developer Community.

PULP OS

PULP is a silicon-proven Parallel Ultra Low Power platform targeting high energy efficiencies. The platform is organized in clusters of RISC-V cores that share a tightly-coupled data memory.

Boards ¶

Note

You can list pre-configured boards by platformio boards command or PlatformIO Boards Explorer
For more detailed board information please scroll tables below by horizontal.

GreenWaves Technologies¶

Name	Debug	MCU	Frequency	Flash	RAM
GAPuino GAP8	On-board	GAP8	250MHz	64MB	8MB