Hi @Tim Edwards @jeffdi, I am trying to install the riscv tool chain to my Ubuntu 22.04.1 LTS machine but currently having some errors running

make flash

for

caravel_board/stanford/blink

. I realized I needed a .c file to configure the GPIOs since they were all configured to be outputs in the

blink.c

file, and currently the blink firmware is the one on my dev board. What I did to install the toolchain:

git clone <https://github.com/riscv/riscv-gnu-toolchain>
cd riscv-gnu-toolchain
sudo apt-get install autoconf automake autotools-dev curl python3 libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev ninja-build
mkdir build && cd build
../configure --prefix=/home/rhyang/chip/riscv-tools-install --with-arch=rv32imc --enable-multilib
make

Upon successful installation, I cd'ed into

../stanford/blink

and edited the

TOOLCHAIN_PATH

to

/home/rhyang/chip/riscv-tools-install

. Am I going in the right path? Thanks.

@Raymond Yang: Yes, that's the right direction. Although currently I don't have an Ubuntu machine, as far as I know everything works well under Ubuntu. You said that you are encountering errors, but you didn't post any. What sort of issues are you seeing?

I also changed the

TOOLCHAIN_PREFIX

to

riscv32-unknown-elf-gcc

, currently the error I am seeing is:

(chip) rhyang@rhyang-ThinkPad-P1:~/chip/caravel_board/stanford/blink$ make flash
#/home/rhyang/chip/riscv-tools-install/bin/riscv32-unknown-elf-gcc -O0 -march=rv32i -Wl,-Bstatic,-T,../sections.lds,--strip-debug -ffreestanding -nostdlib -o blink.elf ../start.s ../print_io.c blink.c
/home/rhyang/chip/riscv-tools-install/bin/riscv32-unknown-elf-gcc -I../ -I../generated/ -O0 -mabi=ilp32 -march=rv32i -D__vexriscv__ -Wl,-Bstatic,-T,../sections.lds,--strip-debug -ffreestanding -nostdlib -o blink.elf ../crt0_vex.S ../isr.c ../stub.c blink.c
../crt0_vex.S: Assembler messages:
../crt0_vex.S:59: Error: unrecognized opcode `csrw mtvec,a0', extension `zicsr' required
../crt0_vex.S:87: Error: unrecognized opcode `csrw mie,a0', extension `zicsr' required
../irq_vex.h: Assembler messages:
../irq_vex.h:31: Error: unrecognized opcode `csrw 3008,a5', extension `zicsr' required
make: *** [Makefile:22: blink.elf] Error 1

@Raymond Yang: Take a look at this github issue: https://github.com/efabless/caravel_board/issues/37. If you're unsure of the solution, ask proppy (Johan Euphrosine); he can be reached in the open-source-silicon Slack workspace.

I am excited to claim that the tapeout works according to the theory. In particular: • the analog section correctly performs delta sigma modulation, however how good the performance is, is yet to be determined • the digital section is still under test

This measurement screenshot shows: • channel 2 (blue) shows the input 1 KHz sine wave • channel 1 (orange) shows the 1-bit delta-sigma modulated signal, where its average value over a "local" time window should reflect the value of the input sine wave

Image_20230508194207.jpg

Thank you both and Mohammed for the help with debugging and the test equipment

@Priyanka Raina: Do you know if there are any updates from the Grapevine team?

has renamed the channel from "chipignite2206q_bringup" to "chipignite2206q_stanford_bringup"

set the channel description: Stanford chipignite shuttle 2206q bringup