nrf_drv_twi.c - many warnings about the order of volatile accesses is undefined

[C0oo1D]

Warning[Pa082]: undefined behavior: the order of volatile accesses is undefined in this statement C:\Projects\..\lib\nrf_drv_twi.c 273 

21 the same warnings. No errors. I believe, I forgot to connect one of the headers? But which one?

main.c headers

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "app_uart.h"
#include "app_error.h"
#include "nrf_delay.h"
#include "nrf.h"
#include "bsp.h"
#include "nordic_common.h"
#include "nrf_drv_twi.h"

libs:

softdevice S210 are programmed.

Thanks for answers!

[Susheel Nuguru]

This seems standard IAR behavior when you have two or more volatile variable access in the same C statement.

supp.iar.com/.../

[C0oo1D]

Yes, but.. it's a standard library (from SDK 9.0.0), I have not changed anything in it, and I doubt that in the library did not exclude possible warnings. More like a curvature of my hands :)

[Alex]

I used Nordic sample project for IAR and see that Pe301,Pa082 suppressed. It is in Project Options->C/C++Compiler->Diagnostics

[C0oo1D]

Where you find a sample TWI project for IAR? (i mean new nrf_drv_twi, not incubated twi_master). If so, then the problem is exhausted. I thought the problem was on my side.. Anyway - thanks! I relaxed :)

[Alex]

It wasn't TWI project. I took first found IAR project, can't remember now, probably heart rate monitor. And it was from SDK7. I doubt anything changed regarding Pa082 in SDK9 since then