Using IAR, nRF52810, and C++

RE: Using IAR, nRF52810, and C++

Mojo — Fri, 20 Dec 2019 17:44:05 GMT

Yes, you can handle all the interrupt in C++. No need to change anything.

See the UART implementations github.com/.../uart_nrf5x.cpp

It is full C++ object oriented design

RE: Using IAR, nRF52810, and C++

Definitely Confused — Fri, 20 Dec 2019 17:40:43 GMT

It was, but I wanted to be able to define some interrupt handlers in C++, so I just went down the full CPP startup file route.

RE: Using IAR, nRF52810, and C++

Mojo — Fri, 20 Dec 2019 17:38:54 GMT

Well, the library I pointed to you have done all that for you already. The only thing you need to do is replace the Vector_xxx.c for the 810, only the vector table and the linker script with correct memory size.

RE: Using IAR, nRF52810, and C++

Definitely Confused — Fri, 20 Dec 2019 17:35:01 GMT

So I'm gonna answer my own question. Big thanks to Mojo for pointing me in the direction he went.

Basically, you have to define your own startup file because you need to make sure the interrupts are provided with C linkage (so they need 'extern "C"' prefixed before the forward declarations. If you do this you can also overwrite any of the handlers you want with a class and static member functions if you so desire.

The starting point I used is here:

https://www.iar.com/support/tech-notes/compiler/cortex-m-interrupt-vector-in-c-ewarm-6.21/

I also used the latest (as of posting) CMSIS v5.6.0 compiler abstraction macros to make things more portable. They define things like __PROGRAM_START and __VECTOR_TABLE so you can write one startup file and use it for any compiler (in theory).

Overall a bit of a pain, but hopefully this helps people so they don't have to go through this hunting.

RE: Using IAR, nRF52810, and C++

Mojo — Fri, 20 Dec 2019 15:51:36 GMT

Can't say if that is the cause. I don't like assembly and never used nordic startup code. I used code from that library in multiple projects on different mcu. Moving from one mcu to another with minimum code changes. Code reuse works great in C++.

RE: Using IAR, nRF52810, and C++

Definitely Confused — Fri, 20 Dec 2019 15:43:05 GMT

So I had been using the iar_startup_nrf52810.s file as my vector table. Do you think that might be the cause of the problem?

RE: Using IAR, nRF52810, and C++

Mojo — Fri, 20 Dec 2019 15:11:52 GMT

This library has the full C++ supports with startup code that works with any Cortex MCU. Although it has implementations for 832 and 840, you can easily adapt it for 810 with minimum changes. It's all C/C+++ code no assembly

linker script : https://github.com/IOsonata/IOsonata/tree/master/ARM/Nordic/nRF52/nRF52832/ldscript modify this for the 810

startup generic to all Cortex MCU : github.com/.../ResetEntry.c

832 implementation specific : https://github.com/IOsonata/IOsonata/tree/master/ARM/Nordic/nRF52/nRF52832/lib/src modify this for the 810