Just an example for msp430g2231, built on
msp430-quickstart
A template for building applications for TI MSP430 microcontrollers.
This project is developed and maintained by the MSP430 team.
TEST
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Rust nightly-2022-01-24 or a newer toolchain. Only nightly compilers work for now.
The
rust-toolchain.tomlfile makes sure this step is done for you. This file tellsrustupto download and use nightly compiler for this crate, as well as download the compiler source to buildlibcore.You can manually set up a nightly compiler as the default for all MSP430 projects by running:
$ rustup default nightly $ rustup component add rust-src
Alternatively, you can manually set up overrides on a project basis using:
$ rustup override set --path /path/to/crate nightly-YYYY-MM-DD`. $ rustup component add --toolchain nightly-YYYY-MM-DD rust-src
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The
cargo generatesubcommand (Installation instructions). -
TI's MSP430 GCC Compiler, version 8.3.0 or greater.
msp430-elf-gccshould be visible on the path.
The following dependencies are required in order to generate a peripheral access crate (see Using this template below)
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svd2rust, version 0.20.0 or a newer commit. -
msp430_svd, version 0.3.0 or a newer commit. Cloning the repo and following the directions in README.md is sufficient.
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Before instantiating a project, you need to know some characteristics about your specific MSP430 device that will be used to fill in the template. In particular:
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What is the exact part number of your device? Which MSP430 family does your part belong to?
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Does your part have an already-existing peripheral access crate (PAC)?
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How much flash memory, RAM, and how many interrupt vectors does your device have?
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Where does flash memory, RAM, and interrupt vectors begin in the address space?
msp430g2553is used for the examples in this crate. Answering the first question above:msp430g2553belongs to theMSP430x2xxfamily.
The linked family manual and datasheet can be used to answer the remaining questions:
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The
msp430g2553PAC exists already and can be found on crates.io. -
msp430g2553has 16kB of flash memory, 512 bytes of RAM, and 16 vectors. -
Flash memory begins at address 0xC000. RAM begins at address 0x0200. The interrupt vectors begin at 0xFFE0.
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If your particular device does not have a PAC crate, you will need to generate one using
svd2rustand possibly publish the crate to https://crates.io. To generate an SVD file, follow the directions in themsp430_svdREADME.md for your device.In some cases like
msp430fr2355, TI's linker files are not consistent with datasheets on where interrupt vectors begin and how many interrupt vectors there are for a given device. In case of a conflict, examine the linker script to determine where to start theVECTORSsection inmemory.x. Copies of many linker scripts are kept in themsp430_svdrepository. -
Instantiate the template and follow the prompts.
$ cargo generate --git https://github.com/rust-embedded/msp430-quickstart Project Name: app Creating project called `app`... Done! New project created /tmp/app $ cd app
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If not targeting
msp430g2553, replace the PAC entry formsp430g2553inCargo.tomlwith that of your device, e.g.:# [dependencies.msp430g2553] # version = "0.3.0" # features = ["rt"] [dependencies.msp430fr2355] version = "0.4.0" features = ["rt"]
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Populate the
memory.xfile with address space layout information of your device. Note: As mentioned above, in case of a conflict between the datasheet and linker script on where interrupt vectors begin, use the linker script!$ cat memory.x MEMORY { /* These values are correct for the msp430g2553 device. You will need to modify these values if using a different device. Room must be reserved for interrupt vectors plus reset vector and the end of the first 64kB of address space. */ RAM : ORIGIN = 0x0200, LENGTH = 0x0200 ROM : ORIGIN = 0xC000, LENGTH = 0x3FE0 VECTORS : ORIGIN = 0xFFE0, LENGTH = 0x20 }
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Build the template application or one of the examples. Some examples (such as
timerortemp-hal) may not compile due to size constraints when building using thedevprofile (the default). Pass the--releaseoption tocargo buildin these cases.$ cargo build $ cargo build --examples
Note that due to
.cargo/configandrust-toolchain.toml, the above is shorthand for:$ cargo +nightly build --target=msp430-none-elf -Zbuild-std=core $ cargo +nightly build --target=msp430-none-elf -Zbuild-std=core --examples
You may wish to experiment with other commented options in
.cargo/config. -
Once you have an ELF binary built, flash it to your microcontroller. Use
mspdebugto launch a debug session andmsp430-elf-gdbwith the linked gdb script. For the msp430g2553 and the MSP-EXP430G2 launchpad board this looks like the following:In one terminal session
$ mspdebug -C mspdebug.cfg rf2500In another terminal session
$ msp430-elf-gdb -x mspdebug.gdb target/msp430-none-elf/debug/appThis will flash your Rust code to the microcontroller and open a gdb debugging session to step through it.
Licensed under either of
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Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
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MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
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