7.6 KiB
Maix Go / K210 stuff
Some demo projects (mostly in rust) for the Maix Go.
Building the C projects
First, get the Kendryte C toolchain and copy or symlink the contents of the
src/ folder to a checkout of https://github.com/sipeed/LicheeDan_K210_examples.git.
Then to build a certain project do:
mkdir build && cd build
cmake .. -DPROJ=<ProjectName> -DTOOLCHAIN=/opt/riscv-toolchain/bin && make
You will get 2 files, build/<ProjectName> and build/<ProjectName>.bin. The former
is an ELF executable, the latter a raw binary that can be flashed or written to
address 0x80000000 in SRAM and directly executed.
Building the Rust projects
Note: it's possible that these projects require Rust nightly to build. I don't intentially use nightly features, however, I always test only using the latest one so it's likely that something will sneak in
Make sure the appropriate target has been added to the toolchain that you wish to use:
rustup target add riscv64gc-unknown-none-elf
Target configuration is set up in .cargo/config, so building is a matter of:
cd rust/<name_of_project>
cargo build --release
This will produce an ELF executable in the workspace's target directory named
rust/target/riscv64gc-unknown-none-elf/release/<name_of_project>.
If you have openocd working for the board, the below should work:
cargo run
Otherwise, see next section.
Running ELF
There is no need anymore to convert to raw binary, as ELF executables can be executed directly on the device (without flashing) using a recent checkout of kflash
kflash.py -t -s -p /dev/ttyUSB1 -B goE "${ELF_NAME}"
This works for both the C and Rust-produced executables. It is also possible to upload and run code on the device through JTAG and OpenOCD, but I have never got this to work myself (openocd cannot find the device).
Currently, rust generates ELF executables based at address 0xffffffff80000000
instead of the expected 0x80000000, to work around lack of medany memory
model support in LLVM (this has ben fixed but hasn't reached stable yet at the
time of writing). To make this work with kflash I had to patch the
following:
diff --git a/kflash.py b/kflash.py
index c092d08..b3bc457 100755
--- a/kflash.py
+++ b/kflash.py
@@ -976,7 +976,7 @@ class KFlash:
if segment['p_type']!='PT_LOAD' or segment['p_filesz']==0 or segment['p_vaddr']==0:
print("Skipped")
continue
- self.flash_dataframe(segment.data(), segment['p_vaddr'])
+ self.flash_dataframe(segment.data(), segment['p_vaddr'] & 0xffffffff)
def flash_firmware(self, firmware_bin, aes_key = None, address_offset = 0, sha256Prefix = True):
# type: (bytes, bytes, int, bool) -> None
Documentation
Additional register documentation that is not in the datasheet can be found here:
- K210 memory map - A rough memory map for the Kendryte K210 (as used on the Sipeed Maix boards)
- OTP memory map - Some random notes about the layout of the Kendryte K210 OTP memory
- LicheeDan / MaixGo on-board peripherals - List of on-board peripherals and chips for the various boards with a K210
External:
- k210.svd - Peripheral description for rust K210 BSP (k210-pac project)
Projects
This is a general random sandbox with silly projects for me to play around with the Maix Go, some are in C and some are in Rust. It turns out that this cheap board is great for playing around with Rust embedded in an environment that has a fair amount of memory and number of peripherals available by default!
glyph_mapping
Variation of the DVP sample that processes the camera input through a simple
DOS 8×8 font glyph-mapping algorithm and shows it on the display.
dump_otp
Dumps the contents of the OTP (One-Time Programmable memory) of the K210 CPU to serial output in Intel HEX format.
secp256k1_{tests,bench}
Run tests and benchmarks for the secp256k1 elliptic curve cryptographic library on this RISC-V CPU.
rust/accelerometer
Read measurements from MSA300 accelerometer. Display a dot on the screen to visualize the current orientation and magnitude.
rust/k210-console
Console emulator written in Rust for the Maix Go.
Barely functional at the moment. This is really a test for some functionality like SPI and driving the display from Rust, and for playing with Rust RISC-V 64 in general.
rust/mandelbrot
Mandelbrot fractal zoom.
rust/game-of-life
"Game of life" cellular automata simulation. The state can be manipulated through the touch screen. The amount of pressure applied determines the radius of the state change.
rust/uart-passthrough
Pass through UART from host to the ESP8285 WIFI chip.
rust/rgbcontrol
Control the color of the RGB LED from the touch screen.
rust/esp8266at
A crate for communicating with WiFi using the ESP8266 using AT commands. TODO: move this to its own repository.
rust/weather
Uses the ESP8285 WiFi chip of the Maix Go to fetch weather data from
wttr.in and print it to the display using k210-console.
rust/dvp-ov
A straightforward passthrough test for video handling, based on dvp_ov in the
SDK: read frames from the OV2640 image sensor and display them on the LCD.
rust/glyph-mapping
Rust port of the glyph mapping demo.
rust/term-server
Uses the ESP8285 WiFi chip of the Maix Go to listen for incoming connections, displaying the data on the terminal.
rust/secp256k1-test
Test for using the elliptic curve cryptography library secp256k1, written in C,
from rust on a RISC-V device.
rust/sdtest
Read and write to a SD card using SPI.
rust/emdgfx
Experiments with embedded-graphics crate.
rust/voxel
Old-school voxel-based landscape renderer.
rust/cryptest
Test the cryptographic acceleration engines of the K210.
ROM re'ing
Annotated radare2 config files for the Boot ROM and OTP can be found under r2.
Other projects
Some interesting K210-based projects and demos by other people:
-
accelerometer - Example of using the MSA300 accelerometer on the MAIX Go board, by GitJer
-
quake1 - Quake 1 on K210. Requires wiring up a PS2 controller.
-
doom1 - Doom 1 on K210