I want to use the STM32G474VET6 in a robotic application with 3 motors and a diff GPS. Can I program it in Assembly or do I use C? If the latter is Keil a good compiler?

[KDIAS.2340]

..

[berendi]

You can program it in assembly or in C, or mix them as you like, even within one function.

Keil is a very good compiler if you can afford it, or you are confident that the code size will never reach 32 kilobytes. Otherwise, STM32CubeIDE or Eclipse CDT with the GNU-MCU-Eclipse plugin are good choices. All of them support both C and assembly.

[KDIAS.2340]

I assume the latter 2 are free. How to get them? Thanks

[Clive1 (HNL)]

There were links, click them

[S.Ma]

Embedded C compilers are good enough that 98% of the time you won't need to down to ASM level.

When knowing how the compiler works and knowing how the core function helps you to write C style with predictable ASM code generation.

And you shall have 20% more flash that needed to disable the compiler optimisations so you can easily put breakpoint and look at human readable ASM code in the debug window when necessary.

The only ASM instruction I use is NOP to place breakpoint hooks (for example in switch case places) and SW delays, and to temporarily disable interrupt (save the interrrupt level in stack, disable, then pop it.

[Piranha]

DMB, DSB, WFI, CLZ, REV, REV16, REVSH, RBIT are also quite necessary in non-trivial projects.

[Pavel A.]

> DMB, DSB, WFI ....

You don't need assembly, all these are CMSIS -defined intrinsics for all major compilers. -- pa

[KDIAS.2340]

Just wonder - is there sample code already available to do this - it is trivial i.e. controls 3 motors only. which is better for a beginner ~STM32CubeIDE or ECLIPSE CDT?

[Tesla DeLorean]

Most places engage an engineer or developer to code the trivial and assembler based stuff.. I use Google to mine the interwebs and git.

CubeIDE is presumably where all the resources are being thrown, forum traffic indicates a mixed level of success, as the teething issues are resolved, and projects/importation issues are addressed.

[KDIAS.2340]

Doesn't answer my question i.e. is there sample code in the public domain that I can modify and use in my application?

[Tesla DeLorean]

It is a relatively new part, and the "motor nuts" aren't huge into community, as most of what they build is work product.

The CubeG4 repository should have what ST is offering.

https://www.st.com/en/embedded-software/stm32cubeg4.html

Look at some of the motor dev boards, and chat with the FAE's covering motor topic.

[KDIAS.2340]

Thanks. I tried contacting AVNET here in Toronto and although within working hours no one picked up. If you can suggest motor dev boards, would appreciate.

[Piranha]

Also, saying only "robotic application with 3 motors" and not mentioning what type of motors and drivers, does make it impossible to suggest anything useful...

[KDIAS.2340]

These are regular brush dc motors 12 V, 2 are the same around 2A each , third is smaller 1.6A

[KDIAS.2340]

A beginner's question; How to program the 32G4, is it through the UART and if so which terminals to use?

[Tesla DeLorean]

Should be some JTAG/SWD pins you can use with an ST-LINK or similar pod

AN2606 should cover USART options https://www.st.com/content/ccc/resource/technical/document/application_note/b9/9b/16/3a/12/1e/40/0c/CD00167594.pdf/files/CD00167594.pdf/jcr:content/translations/en.CD00167594.pdf

Tool, STM32 Cube Programmer https://www.st.com/en/development-tools/stm32cubeprog.html

[KDIAS.2340]

Thanks. Still trying to figure it out. Here is a pic, I think it is the 2-row connector to the left of the micro.

[Tesla DeLorean]

The connector and silk-screen suggest it is a 20-pin JTAG header, would connect to an ST-LINK/V2 or J-LINK type pod.

[KDIAS.2340]

sorry, but what is ST-LINK/V2 or j-LINK

[KDIAS.2340]

How to find out if it is ST-LINK or J-LINK?

[Tesla DeLorean]

Either, should I Google this stuff for you?

It is a header you'd plug the aforementioned debug pods into.

Perhaps you could refer to the schematic for your board, of docs from its manufacturer.​

[KDIAS.2340]

tHANKS