Compiling C and C++ code

RE: Compiling C and C++ code

dingari — Sat, 17 Sep 2016 14:11:47 GMT

This is somewhat solved. The c++ compiler didn't like how the NRF_GPIOTE_INITIAL_VALUE_LOW was initializing structs.

Doing

// Configure output pins for LEDs
nrf_drv_gpiote_out_config_t out_config = {};
out_config.init_state = NRF_GPIOTE_INITIAL_VALUE_LOW;
out_config.task_pin = false;

instead of

nrf_drv_gpiote_out_config_t out_config = GPIOTE_CONFIG_OUT_SIMPLE(false);

allowed us to compile.

RE: Compiling C and C++ code

dingari — Sat, 17 Sep 2016 14:08:45 GMT

Hi, I solved this issue at the time by going around the GPIOTE_CONFIG_OUT_SIMPLE macro. Instead just doing

// Configure output pins for LEDs
nrf_drv_gpiote_out_config_t out_config = {};
out_config.init_state = NRF_GPIOTE_INITIAL_VALUE_LOW;
out_config.task_pin = false;

RE: Compiling C and C++ code

butch — Sat, 17 Sep 2016 10:43:50 GMT

You might try changing from an initializer to an assignment:

nrf_drv_gpiote_out_config_t out_config;
out_config = GPIOTE_CONFIG_OUT_SIMPLE(false);

You might treat this function as C: put it in a separate file and compile it as C, declare it as extern "C" in main and call it from your C++ main.

These solutions don't require changing the SDK. You should not be afraid to change the SDK (but yes, it would require a redo when a new SDK comes out.)

The SDK partially (not fully) supports C++ compilation (some #ifdef __cplusplus.) In my experience, you can (but it is not trivial) compile the SDK as C++ with just a few changes. The main thing that bit me was: if you define any IRQ handlers to override the default, make sure to declare then as extern "C" so the names aren't mangled. You can use the "nm" command to examine .o and .bin files to see what names are mangled.

RE: Compiling C and C++ code

Nguyen Hoan Hoang — Thu, 30 Jun 2016 12:36:30 GMT

Well it does not depends on Eclipse. Eclipse is just an IDE, it has nothing to do with C++. If you read the post, you'll find what needed to be changed in the SDK to make it work for C++.

RE: Compiling C and C++ code

dingari — Thu, 30 Jun 2016 09:37:21 GMT

Thanks for the reply, but I was hoping to find a solution that doesn't require an IDE like Eclipse.

Is the IDE way the only way to go for compiling C and C++ code for the NRF51822?

RE: Compiling C and C++ code

Nguyen Hoan Hoang — Wed, 29 Jun 2016 19:10:50 GMT

Have a look at this blog.