onetonfoot / micropython_cbor

A native c module for CBOR encoding

Micropython CBOR

A native C module for CBOR encoding

import ucbor

d = {
	"x" : 10,
	"y" : 11,
}

bs = ucbor.dumps(d)
ucbor.loads(bs)

Building

pip install pyelftools
git clone https://github.com/micropython/micropython.git /opt/micropython
ARCH=armv6 make

References

Various references used during development:

• micropython/micropython#5641
• https://github.com/jeremyherbert/micropython/blob/3a41f2e935fb33f070b77ad77fc3bd2488d4d922/examples/natmod/ucbor/ucbor.c
• micropython/micropython#5597
• micropython/micropython#8009
• https://forums.raspberrypi.com/viewtopic.php?t=305744#p1880732
• https://stackoverflow.com/questions/29344048/undefined-reference-to-memcpy-in-arm-none-eabi-link-chain
• https://clc-wiki.net/wiki/memcpy#Implementation
• https://www.openembedded.org/pipermail/openembedded-devel/2011-April/077133.html
• https://www.geeksforgeeks.org/write-memcpy/

This is built on top of tinycbor v0.6, the original source code was modified to remove large switch statements to avoid the error undefined reference to __gnu_thumb1_case_uqi when compiling for arm.