RA-FSP-SYS

This is a basic wrapper over Flexible Software Package, a bare minimum to correctly compile and run basic Rust program.

This crate should be used instead of cortex-m-rt, but it makes a best effort to mimic it's interface. This way, you can use Embassy and RTIC wihout any problems.

Runtime

• Applies a manufacturer‑provided linker script to support features like ID code protection.
• Basic vector table is provided by FSP, including Reset_Handler, which will call SystemInit (to configure C runtime, clocks etc) and then main.
• Application specific vector table may be provided by the user using .application_vectors section. Associated PACs do provide it.

What you must provide

• FSP_CFG env variable with header files to configure FSP.
  • Contains all r_.*_cfg.h coniguration files.
  • Containst /bsp directory witb bsp configurations, like bsp_cfg.h, board_cfg.h, bsp_clock_cfg.h etc.
• FSP_PATH env variable provides the source code for FSP.
• CMSIS_PATH env variable provides the source code for CMSIS.
• memory.x.
• fsp_base.ld, linker script provided by FSP for your MCU.
• Use PAC crate, which will have device.x and export IV.
• Add -C link-arg=-Tra-fsp-sys.x (as -Tlink.x with cortex-m-rt).

Footgun

Renesas devices support ID code protection via the OSIS register:

• The OSIS register stores a 128-bit ID code used for authentication when connecting a debugger or serial programmer.
• If the ID codes do not match, the device remains locked and prohibits external access.
• A special linker script and startup procedure are required to configure the OSIS register safely and avoid accidental locking of the MCU.

Manufacturer‑provided FSP to handles ID code setup in SystemInit and linker script. Do not rewrite or bypass this logic unless you fully understand the implications. Authour of this crate killed several MCUs to figure it out.

License

By using this software, you agree to the additonal terms and conditions found at: http://www.renesas.com/disclaimer.

All Rust source code exept generated module is licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.