HAL NO! Unleashing microcontrollers by making an SDK from the bottom up.
Charles L
Long talk
Time
June 21, 2025 4:00-4:50 PM
Location
Talk Track One
ch32fun is an embedded SDK for the CH32 series of RISC-V microcontrollers with a focus on transparency between code and hardware to help maximize the value you can get out of your chips. In developing this SDK, a broad set of knowledge also had to be developed having to do with the way processors process, compilers compile and programming interfaces program. This talk will go into all the details you would need if you wanted to develop an SDK for another chip or some toy architecture, especially if it’s based on RISC-V or ARM.
Specifically we will be going through the following topics:
- Startup code
- Linker scripts
- Assembler directives
- Inline assembly
- Registers (and their use, with structs)
- Programming interfaces
- How GDB Works
- Semihosting
- Trade-offs, code size/speed
- Crash handling
- ABIs