Linking error with SAADC driver

[michael1]

I am getting the linking error seen in the uploaded image. I am using segger embedded studio with SDK 15.3.0. I have already added the nrfx_saadc.c file to the project folder as well as enabled saadc in the config file.

#define SAMPLES_IN_BUFFER 1
static nrf_saadc_value_t     m_buffer_pool[2][SAMPLES_IN_BUFFER];

void saadc_callback(nrf_drv_saadc_evt_t const * p_event)
{
    if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
    {
        ret_code_t err_code;

        err_code = nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, SAMPLES_IN_BUFFER);
        APP_ERROR_CHECK(err_code);
    }
}
void saadc_init(void)
{
    ret_code_t err_code;
    nrf_saadc_channel_config_t channel_config =
        NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN0);

    err_code = nrf_drv_saadc_init(NULL, saadc_callback);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_saadc_channel_init(0, &channel_config);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[0], SAMPLES_IN_BUFFER);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[1], SAMPLES_IN_BUFFER);
    APP_ERROR_CHECK(err_code);

}

code error points to

[Jørgen Holmefjord]

Hi,

Have you enabled the SAADC legacy driver by setting the following define in your sdk_config.h file?

// <e> SAADC_ENABLED - nrf_drv_saadc - SAADC peripheral driver - legacy layer
//==========================================================
#ifndef SAADC_ENABLED
#define SAADC_ENABLED 1
#endif

Best regards,
Jørgen

[michael1]

Hi,

I have enabled the SAADC in the sdk_config.h file. The error still persist? Is there any else I am missing when adding a driver other than adding the driver file to the project and enabling in sdk_config.h?

Thanks

[Jørgen Holmefjord]

Adding the source file and enabling the module should be sufficient. Are you sure that you did not include multiple sdk_config.h files, or if there is something else in the project that overwrites the config?

Can you upload the project for debugging?

[Chris_Dev]

Hi Michaell,

I had the same issue, even after changing the sdk_config.h file and adding the source files to my project.

Jorgen is correct, this should be sufficient.

A temporary fix for this is to go to the nrfx_saadc.c file and add #define NRFX_SAADC_ENABLED 1 to the top of the file. See below:

Regards

Chris

[michael1]

Hi,

I actually fixed the problem using the method you suggested after looking at Jorgen's and Chris's answer. I realized that there is actually two saadc enables and I only enabled the nrfx_saadc_enabled. 

#ifndef SAADC_ENABLED
#define SAADC_ENABLED 1
#endif

#ifndef NRFX_SAADC_ENABLED
#define NRFX_SAADC_ENABLED 1
#endif

However, I am wondering if you can help with a very similar linking issue with the PPI driver. I have added the PPI driver file and enabled it in the sdk_config.h file. However, I am getting a linking error seen below. I have attached the project files for the attached a link for the project. 

github.com/.../ble_app_template copy

Building ‘ble_app_template_pca10056_s140’ from solution ‘ble_app_template_pca10056_s140’ in configuration ‘Release’
  Compiling ‘main.c’
  Linking ble_app_template_pca10056_s140.elf
    Output/ble_app_template_pca10056_s140 Release/Obj/main.o: in function `saadc_sampling_event_init':
    undefined reference to `nrf_drv_ppi_init'
Build failed