A simple Makefile based project for WCH's range of CH32Vxxx RISC-V uControllers.
There's not too much original work here, most of it has been collated from various file dumps etc. from WCH's own site and other pages.
Currently only supports CH32V003 devices.
FYI, the development board I have looks like this:
This whole project is really early days, so the general layout etc. could and most probably will change as bugs are fixed, and support for other devices is added.
Also PRs are always welcome.
Only tested on Ubuntu 22.04, but should work on any recent linux.
The following will install to ${HOME}/opt/riscv ensure ${HOME}/opt/riscv/bin is in ${PATH} before running.
# Prereqs
sudo apt-get install autoconf automake autotools-dev curl libmpc-dev libmpfr-dev \
libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils \
bc zlib1g-dev libexpat-dev
# Get toolchain source
mkdir ~/github.com
cd ~/github.com
git clone https://github.com/riscv/riscv-gnu-toolchain riscv/riscv-gnu-toolchain
cd riscv/riscv-gnu-toolchain
# Confure build
./configure --prefix=${HOME}/opt/riscv --with-arch=rv32g --with-abi=ilp32
# build
make -j$(nproc)WCH seems to need a modifed openocd. I've been uable to find the source code for it, but a "working binary" is provided in the run directory.
I found the easiest setup is to install the following packages first.
# Prereqs. for openocd
sudo apt install libjaylink-dev libjaylink0 libhidapi-dev libhidapi-hidraw0 libhidapi-libusb0 openocd
# udev rule for programmer
sudo cp run/60-libch32v.rules /etc/udev/rules.d/60-libch32v.rules
# reload rules
sudo udevadm control --reload-rulesOnce all of the tools above are install/configured, you can build and test a version of blinky as follows.
To build, simply run make in the root of this repo.
If all goes well, the last few lines of output shoud look something like this:
Linking...
riscv32-unknown-elf-gcc -std=gnu11 -march=rv32ec -mabi=ilp32e -ffreestanding -fno-pic -Os -Werror -g -Ilibch32v/include/libch32v -DPRINTF_INCLUDE_CONFIG_H -Wp,-M,-MP,-MT,build/ch32vtst.o,-MF,build/ch32vtst.d -ffunction-sections -fdata-sections build/libch32v/lib/src/startup.o build/libch32v/lib/src/vector_ch32v003.o build/app/main.o build/libch32v/lib/src/ch32v00x_adc.o build/libch32v/lib/src/ch32v00x_dbgmcu.o build/libch32v/lib/src/ch32v00x_dma.o build/libch32v/lib/src/ch32v00x_exti.o build/libch32v/lib/src/ch32v00x_flash.o build/libch32v/lib/src/ch32v00x_gpio.o build/libch32v/lib/src/ch32v00x_i2c.o build/libch32v/lib/src/ch32v00x_it.o build/libch32v/lib/src/ch32v00x_iwdg.o build/libch32v/lib/src/ch32v00x_misc.o build/libch32v/lib/src/ch32v00x_opa.o build/libch32v/lib/src/ch32v00x_pwr.o build/libch32v/lib/src/ch32v00x_rcc.o build/libch32v/lib/src/ch32v00x_spi.o build/libch32v/lib/src/ch32v00x_tim.o build/libch32v/lib/src/ch32v00x_usart.o build/libch32v/lib/src/ch32v00x_wwdg.o build/libch32v/lib/src/debug.o build/libch32v/lib/src/system_ch32v00x.o -Wl,-Map,build/ch32vtst.map -nostdlib -Wl,--no-relax -Wl,--gc-sections -Wl,-Tlibch32v/linker/ch32v003.ld --output build/ch32vtst.elf
riscv32-unknown-elf-size -A -x build/ch32vtst.elf
build/ch32vtst.elf :
section size addr
.vector 0xa0 0x0
.text 0x410 0xa0
.data 0x4 0x20000000
.sbss.NVIC_Priority_Group 0x4 0x20000004
.sbss.p_ms 0x2 0x20000008
.sbss.p_us 0x1 0x2000000a
.stack 0x200 0x20000600
.riscv.attributes 0x25 0x0
.comment 0xf 0x0
.debug_line 0x2796 0x0
.debug_info 0x2168 0x0
.debug_abbrev 0xb57 0x0
.debug_aranges 0x2b8 0x0
.debug_str 0xd88 0x0
.debug_ranges 0x20 0x0
.debug_rnglists 0x2b1 0x0
.debug_line_str 0x1d1 0x0
.debug_frame 0x4d4 0x0
.debug_loclists 0xd8d 0x0
Total 0x8287
riscv32-unknown-elf-objdump -h -S -C build/ch32vtst.elf > build/ch32vtst.lst
riscv32-unknown-elf-nm -n build/ch32vtst.elf > build/ch32vtst.sym
To program what's just been built, run the following:
➜ libch32v git:(main) ✗ ./run/openocd -f run/wch-riscv.cfg -c init -c halt -c "program build/ch32vtst.elf" -c exit
Open On-Chip Debugger 0.11.0+dev-02215-gcc0ecfb6d-dirty (2022-10-10-10:35)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'jtag'
Ready for Remote Connections
Info : WCH-LinkE-CH32V307 mod:RV version 2.7
Info : wlink_init ok
Info : This adapter doesn't support configurable speed
Info : JTAG tap: riscv.cpu tap/device found: 0x00000001 (mfg: 0x000 (<invalid>), part: 0x0000, ver: 0x0)
Warn : Bypassing JTAG setup events due to errors
Info : [riscv.cpu.0] datacount=2 progbufsize=8
Info : Examined RISC-V core; found 1 harts
Info : hart 0: XLEN=32, misa=0x40800014
[riscv.cpu.0] Target successfully examined.
Info : starting gdb server for riscv.cpu.0 on 3333
Info : Listening on port 3333 for gdb connections
Info : JTAG tap: riscv.cpu tap/device found: 0x00000001 (mfg: 0x000 (<invalid>), part: 0x0000, ver: 0x0)
Warn : Bypassing JTAG setup events due to errors
** Programming Started **
Info : device id = 0x3d05abcd
Info : flash size = 16kbytes
Info : Hart 0 unexpectedly reset!
** Programming Finished **
➜ libch32v git:(main) ✗
Just reset the target and you should be running the new code.
If you want to debug your program, first program the device as above.
Run the following
➜ libch32v git:(main) ✗ ./run/openocd -f run/wch-riscv.cfg -c init -c halt -c wlink_reset_resume
Open On-Chip Debugger 0.11.0+dev-02215-gcc0ecfb6d-dirty (2022-10-10-10:35)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'jtag'
Ready for Remote Connections
Info : WCH-LinkE-CH32V307 mod:RV version 2.7
Info : wlink_init ok
Info : This adapter doesn't support configurable speed
Info : JTAG tap: riscv.cpu tap/device found: 0x00000001 (mfg: 0x000 (<invalid>), part: 0x0000, ver: 0x0)
Warn : Bypassing JTAG setup events due to errors
Info : [riscv.cpu.0] datacount=2 progbufsize=8
Info : Examined RISC-V core; found 1 harts
Info : hart 0: XLEN=32, misa=0x40800014
[riscv.cpu.0] Target successfully examined.
Info : starting gdb server for riscv.cpu.0 on 3333
Info : Listening on port 3333 for gdb connections
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : Hart 0 unexpectedly reset!
In another terminal, you can connect a gdb session as follows:
➜ libch32v git:(main) ✗ riscv32-unknown-elf-gdb --command run/gdb-init build/ch32vtst.elf
GNU gdb (GDB) 12.1
Copyright (C) 2022 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "--host=x86_64-pc-linux-gnu --target=riscv32-unknown-elf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from build/ch32vtst.elf...
_vector_table () at libch32v/lib/src/vector_ch32v003.S:6
6 j reset_handler // No. 0 : Reset Handler
(gdb) b main
Breakpoint 1 at 0x192: file app/main.c, line 47.
Note: automatically using hardware breakpoints for read-only addresses.
(gdb) c
Continuing.
Breakpoint 1, main () at app/main.c:47
47 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
(gdb) info reg
ra 0x11e 0x11e <init_data_done+36>
sp 0x20000800 0x20000800
gp 0x20000000 0x20000000 <SystemCoreClock>
tp 0x9848402 0x9848402
t0 0x80 128
t1 0x2dc6c00 48000000
t2 0x80000 524288
fp 0xe000f000 0xe000f000
s1 0x4d269250 1294373456
a0 0x20000004 536870916
a1 0x20000004 536870916
a2 0x20000 131072
a3 0x40021000 1073876992
a4 0x8 8
a5 0x8 8
a6 0x0 0
a7 0x0 0
s2 0x0 0
s3 0x0 0
s4 0x0 0
s5 0x0 0
s6 0x0 0
s7 0x0 0
s8 0x0 0
s9 0x0 0
s10 0x0 0
s11 0x0 0
t3 0x0 0
t4 0x0 0
t5 0x0 0
t6 0x0 0
pc 0x192 0x192 <main>
(gdb)
In no particular order and just off the top of my head.
- Add examples for USART, I2C etc
- Investigate adding support for libc. picolib looks promising
- General bug fixes and tidy up
- Support other variants of WCH's CH32V range of uControllers
- Understand what changes WCH added to openocd to work with their devices
- Better documentaion