5 ms·

The Rover is not connected to the internet. Do you know what subset of C NASA limits itself to? Or hw architecture? The rigour of their testing? Should all C d

The Rover is not connected to the internet. Do you know what subset of C NASA limits itself to? Or hw architecture? The rigour of their testing? Should all C developers follow the same restrictions as NASA?

peterburkimsher 6y ago
The rover was built by NASA JPL, and they have their own coding standard based on MISRA 2004. https://andrewbanks.com/wp-content/uploads/2019/07/JPL_Coding_Standard_C.pdf https://andrewbanks.com/wp-content/uploads/2019/07/JPL_Codin... https://nodis3.gsfc.nasa.gov/displayAll.cfm?Internal_ID=N_PR_7150_002A_&page_name=all https://nodis3.gsfc.nasa.gov/displayAll.cfm?Internal_ID=N_PR... Hardware (according to Wikipedia) is a BAE Systems RAD750 radiation-hardened single board computer based on a ruggedized PowerPC G3 microprocessor (PowerPC 750). The computer contains 128 megabytes of volatile DRAM, and runs at 133 MHz. https://en.wikipedia.org/wiki/Perseverance_(rover) https://en.wikipedia.org/wiki/Perseverance_(rover) Testing sounds pretty rigorous, at least for large projects. https://www.quora.com/What-does-a-software-engineer-do-at-the-NASA-JPL https://www.quora.com/What-does-a-software-engineer-do-at-th... Personally I firmly believe that "all C developers" do not need to follow these regulations. It might even be counter-productive to slow down the development process for some clients. For safety-critical systems, these rules make sense. For little startups, they don't. Developers are smart enough to learn these rules, so HR shouldn't ask for "5 years MISRA experience". It's really a choice of business model, time to market, and risk management. If you're a big company looking to cut costs, be careful about outsourcing firmware development to a little startup who might not follow these rules so strictly. I won't follow these rules for the stuff I throw together in my free time and put on Github, but I will be careful before committing code to master for medical device firmware.
jimbob45 6y ago
His point is moot anyway. They could have written the entire code base in Rust and compiled it down to C for all we know.
taharvey 6y ago
C is already a subset. It's basically one step above assembly.

peterburkimsher 6y ago

The rover was built by NASA JPL, and they have their own coding standard based on MISRA 2004. https://andrewbanks.com/wp-content/uploads/2019/07/JPL_Coding_Standard_C.pdf https://andrewbanks.com/wp-content/uploads/2019/07/JPL_Codin... https://nodis3.gsfc.nasa.gov/displayAll.cfm?Internal_ID=N_PR_7150_002A_&page_name=all https://nodis3.gsfc.nasa.gov/displayAll.cfm?Internal_ID=N_PR... Hardware (according to Wikipedia) is a BAE Systems RAD750 radiation-hardened single board computer based on a ruggedized PowerPC G3 microprocessor (PowerPC 750). The computer contains 128 megabytes of volatile DRAM, and runs at 133 MHz. https://en.wikipedia.org/wiki/Perseverance_(rover) https://en.wikipedia.org/wiki/Perseverance_(rover) Testing sounds pretty rigorous, at least for large projects. https://www.quora.com/What-does-a-software-engineer-do-at-the-NASA-JPL https://www.quora.com/What-does-a-software-engineer-do-at-th... Personally I firmly believe that "all C developers" do not need to follow these regulations. It might even be counter-productive to slow down the development process for some clients. For safety-critical systems, these rules make sense. For little startups, they don't. Developers are smart enough to learn these rules, so HR shouldn't ask for "5 years MISRA experience". It's really a choice of business model, time to market, and risk management. If you're a big company looking to cut costs, be careful about outsourcing firmware development to a little startup who might not follow these rules so strictly. I won't follow these rules for the stuff I throw together in my free time and put on Github, but I will be careful before committing code to master for medical device firmware.

jimbob45 6y ago

His point is moot anyway. They could have written the entire code base in Rust and compiled it down to C for all we know.

taharvey 6y ago

C is already a subset. It's basically one step above assembly.