I'm trying to create a proof of concept for Rust and C interoperability on msp430g2553 platform. The idea is Rust code calls a rudimentary UART library to send text through COM to the computer. My app compiles and links seemingly fine, but when I check with msp430-elf-size utility:

   text    data     bss     dec     hex filename
      6       0       4      10       a msp430-c-interop

And mspdebug utility flashes exactly 6 bytes to the device. The actual file size is 1952 bytes.

msp430-elf-objdump with disassembly prints:

msp430-c-interop:     file format elf32-msp430 


Disassembly of section .text: 

0000c000 <\__crt0_start>: 
    c000:       31 40 00 04     mov     #1024,  r1      ;#0x0400

Seems like it enters __crt0_start implementation from the C library and then probably can't find the main function and resets the device continuously.

I tried removing the msp430-rt crate's entry implementation and decorate the Rust main with extern "C" main() -> ! but that didn't work either.

I created a repo on GitHub. The code can be found there: GitHub - burumdev/msp430-rs-c-interop: Experimental and mental app to demonstrate Rust and C interop in msp430 embedded environment · GitHub

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