Hello
I got an interest on LPC55S14 Microcontroller. I'm using keil uvision 5 IDE. I would like to try programming this chip using assembly language. Can I have a sample startup file and a simple main file just to begin with?
By the way, I'm already familiar with arm cortex m3/m4 instructions.
Thanks and best regards.
As far as I can see, the default startup file shipped by NXP in their LPC55S14_DFP version 18 is still in assembler. So you can have a look there (_YOUR_PACK_ROOT_\NXP\LPC55S14_DFP\18.0.0\devices\LPC55S14\gcc\startup_LPC55S14.S) for refence.
For other examples it is probably best, you use the compiler to let it produce assembly code (https://developer.arm.com/documentation/ka003163/latest/) and then use the generated assembler file from a simple C module as starting point.
These might also be useful for you:
https://learn.arm.com/learning-paths/microcontrollers/asm/
https://learn.arm.com/learning-paths/microcontrollers/efficient_embedded/coding/
***Note: for Cortex-M devices, be careful of bit[0]
Bit[0] being zero can clear the T-bit in the Program Status Registers (xPSR). If this happens, the device will halt.
https://developer.arm.com/documentation/ddi0337/h/programmers-model/exceptions?lang=en
https://developer.arm.com/documentation/ka001193/latest/
You might run into this with:
vector table entries Reset vector valueAddress for Jump instructions