使用IAR在开发nordic的sdk的时候，官方有一段话
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Note for IAR 8 users:
(Libraries for IAR 8 require wchar_t to be of size 32 bits while IAR 7 requires 16 bits).
To run a project using IAR 8, follow these intructions:
- Open the IAR project in IAR 8. The IAR workbench will automatically generate an IAR 8 compatible project file.
- If the project contains one of the precompiled libraries listed below, replace it with the IAR 8 compatible alternative
(there are no projects targeting nRF51 in this SDK).
- Save the project.
- When building the project, you might get the warning: "The header file 'cmsis_iar.h' is obsolete and should not be used. [...]".
- The problem is described in DevZone post: https://devzone.nordicsemi.com/f/nordic-q-a/31123/iar-ewarm-8-22-1-complains-about-cmsis_iar-h
The solution is to remove all occurrences of #include <cmsis_iar.h>.
The affected libraries are:
- micro-ecc crypto:
- IAR7: Includes library located in the folder named “…_iar…”.
- IAR8: Switch to using the library from the folder named “…_armgcc…”.
- nrf_cc310, nrf_cc310_bl, and nrf_oberon:
- IAR7: Includes the library where “_short_wchar_” is part of the file name.
- IAR8: Switch to using the library with similar naming, but where the “short_wchar” is removed.
- Gazell, NFC Tag, and 802.15.4:
- IAR7: Includes the library where the file name ends with “_iar”.
- IAR8: Switch to using the library with similar file name that ends with “_gcc”.
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同时，官当sdk在下面的各个开发平台中进行验证，
，The following toolchains/devices have been used for testing and verification:
- ARM: MDK-ARM version 5.18a
- GCC: GCC ARM Embedded 6.3 2017-q2-update
- IAR: IAR Workbench 7.80.4 (IAR 8 - see note below)
- SES: SES 3.40
因此，今天特意在iar8编译hrs心率例程的时候，发现了wchar_在iar7和iar8是不同的，因此建议使用iar7.80.4进行开发比较妥当，与官方的sdk相匹配。keil的ses两个开发坏境是没有问题的。