ch32v103
ch32v307
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ch32v103
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What are some cheap alternatives to Atmega32u4?
WCH CH32V203 (approx. $0.50) with RT-Thread? There are no examples for it on Github but you can use the V307 and V103 repos.: https://github.com/openwch/ch32v103
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Useful Tools and Resources for RISC-V development
https://github.com/openwch/ch32v103 and https://github.com/openwch/ch32v307 For those tracking such things (Bruce), they are using Qingke V4F core in '307, V4C in '208, V4B in '203 and V4A in '103 and the older, more dedicated parts like the BLE parts like CH57x and CH58x. Source I know of no other parts using those cores, so they may be focusing on the Chinese market or even an internal brand.
ch32v307
- My alpha Pico-based CH32V003 debug tool is ready for a few testers
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Hardware/software to run RISC-V ASM?
VCC-GND Studio is about to launch similar boards based on CH32V307.
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EPS32 but for wired Ethernet instead?
But if you're looking for RISC-V + integrated PHY, take a look at WCH's CH32V307 - just add magnetics, termination and an RJ45 jack and you've got 10BaseT.
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MCU dev board with 5 UARTs?
Yes, English datasheets can be found - along with code examples, board schematics etc - at the openwch/ch32v307 Github repo.
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Useful Tools and Resources for RISC-V development
More realistically, I DO think there's value for a terminal server that's just an ethernet connection (even one that's ancient) with some amount of programmability that's connected to 80 GPIO pins, some of which may be serial ports. I could imagine testing 1-2 Raspberry Pi-class with a bed of nails style test jig that confirms that all the GPIO, JTAG, and such are at least toggleable by sending synchronized signals to the BeagleBone/VisionFive/ESP32-C3/ whatever to confirm that all the I/O pins survived the fine wires from the wafer to the package plus all intervening PCB vias and soldering and so on. (Maybe you can't test board X with another board X because there's a different number of inputs and outputs.)
- The RISC-V MCU CH32V307 is a bad boy
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New $10 Risc-V development board
looks to be IMAFC from the PDF on their github (https://github.com/openwch/ch32v307/blob/main/Datasheet/CH32V20x_30xDS0.PDF)
What are some alternatives?
RISC-V-Guide - RISC-V Guide. Learn all about the RISC-V computer architecture along with the Development Tools and Operating Systems to develop on RISC-V hardware.
pico-examples
uni-STC - SDCC support + HAL + drivers for STC 8051 MCU
ch32-rs - Embedded Rust device crates for WCH's RISC-V and Cortex-M microcontrollers
stcgal-patched - stcgal patched to support STC8G, STC8H, STC8A8K64D4 and STC32G.
Energia - Fork of Arduino for the Texas Instruments LaunchPad's
freedom-tools - Tools for SiFive's Freedom Platform
Awesome_STC - How-To style documentation on STC MCU
riscv-openocd-wch - This is the OpenOCD source code modified to support WCHlink and CH32Vxxx MCUs, received from MounRiver after my GPL request, and published here as a service for everyone interested, BTW: 8bitgeek is putting in a lot of effort to make it workable on Linux, check their fork! I claim no copyright on any of it, and I'm only exercising the rights granted by the GPL.
picorvd - GDB-compatible RISC-V Debugger for CH32V003 that runs on a Raspberry Pi Pico