Operating NRF52 peripherals (TWI) in c++ mode

RE: Operating NRF52 peripherals (TWI) in c++ mode

Patrick — Fri, 01 Nov 2019 11:40:52 GMT

The problem you're likely running into is that C++ requires initializers to be in order whereas C will let you initialize members in any order. What this means for you, if you want to use C++ with the SDK, is that instead of using the helper macros to initialize a peripheral instance you need to explicitly initialize the structs in the correct order.

For example, in the twi_sensor example, lets look at line 80. Rather than use the macro to initialize the TWI instance you would need to do something like the following:

// Using nrf_drv
static const nrf_drv_twi_t m_twi = { .inst_idx = 0, .twi = NRF_DRV_TWI_INSTANCE_0, .use_easy_dma = true };

// If using nrfx
static const nrfx_twim_t m_twi = { .p_twim = NRF_TWIM0, .drv_inst_idx = NRFX_TWIM0_INST_IDX };

Looking further into the example you may also need to replace the function calls to nrf_drv_twi_tx and nrf_drv_twi_rx with the version that takes a transfer descriptor that you have created, initializing the members in order.

I am using the nrfx drivers in my projects so hopefully I have gotten the nrf_drv initialization correct. If nothing else you should have an idea of what you need to do now to clear your compiler errors.

*The above applies to initializing other peripherals as well. It is somewhat an inconvenience but worth the effort in my opinion.

RE: Operating NRF52 peripherals (TWI) in c++ mode

ovrebekk — Fri, 01 Nov 2019 08:25:42 GMT

mbed OS is also C++ based, and has support for the nRF52DK (not sure about the nRF52840 though..)

The problem of any third party software platform is that we don't support it, and you need to rely on whatever support/forums are available for that specific platform if you have software issues.

Best regards
Torbjørn

RE: Operating NRF52 peripherals (TWI) in c++ mode

Mojo — Thu, 31 Oct 2019 18:14:56 GMT

Try this library https://github.com/IOsonata/IOsonata

It's C++ object design.

some tutorial from these pages.

http://embeddedsoftdev.blogspot.com/2018/02/bluetooth-le-with-nordic-nrf51-nrf52.html

RE: Operating NRF52 peripherals (TWI) in c++ mode

MRK-196 — Thu, 31 Oct 2019 08:14:40 GMT

Thanks for your reply, Is there an example how I can use the TWI and Bluetooth peripheral on a C++ platform ?

RE: Operating NRF52 peripherals (TWI) in c++ mode

ovrebekk — Thu, 31 Oct 2019 07:35:31 GMT

The nRF5 SDK doesn't support C++ unfortunately.

Several of the files use features not supported by the C++ compiler, such as designated struct initializers.

Best regards
Torbjørn

RE: Operating NRF52 peripherals (TWI) in c++ mode

MRK-196 — Wed, 30 Oct 2019 11:13:08 GMT

Maybe it was not clear in my question, just to make it clear, I want the code to work in a C++ environment instead of C