The sdk_config.h file is not being parsed by the compiler

[apdobaj]

I cannot get the scope of the sdk_config.h file to encompass all modules. Process

• Start with example project using the file system as per the install.
• After compiling and running on the DK, copy the example files over to a new folder for inclusion into revision control.
• Edit the project file to make sure the relative paths have been properly modified to reflect the new project folder
• Make sure the project still compiles and runs.
• Make an edit that includes a new module, in this case the TWIM
• dutifully edit the sdk_config.h file to enable the TWIM module
• Compiler error in main at this line: static const nrfx_twim_t twi0 = NRFX_TWIM_INSTANCE(TWI_INSTANCE_ID);
• When expanding the macro the compiler cannot find a definition for "NRFX_TWIM0_INST_IDX" because it is not enumerated in nrfx_twim.h because NRFX_TWIM0_ENABLED is not defined
• Go back and check the nrf_config.h file and it is indeed enabled.
• Find out that disabling other modules in the nrf_config.h file doesn't have an effect, ergo the nrf_config.h file is not being used.
• To make sure the pathways are not pointing to another version, disable (rename) all other nrf_config.h files in the file system - no effect.
• Explicitly define NRFX_TWIM0_ENABLED in nrfx_twim.h and everything compiles fine.
• make a test header file with just that line and include it in main - no effect.
• include that same test header file in nrfx_twim.h file, everything compiles fine
• remove the test include and include the sdk_config.h file in the nrfx_twim.h file, compile fails again

What on earth is going on? I've searched up and down the project settings thinking that the config file is disabled somehow, but nothing. 

[Vidar Berg]

Hi,

It sounds like the problem may be caused by the "apply_old_config" header located in the /<SDK>/integration directory. This file is responsible for making sure NRFX_ configurations correspond to their respective legacy NRF_ configurations. I.e.,  override the NRFX_ setting whenever the legacy setting is different. 

TWI legacy settings

// <e> TWI_ENABLED - nrf_drv_twi - TWI/TWIM peripheral driver - legacy layer
//==========================================================
#ifndef TWI_ENABLED
#define TWI_ENABLED 1
#endif
// <o> TWI_DEFAULT_CONFIG_FREQUENCY  - Frequency
 
// <26738688=> 100k 
// <67108864=> 250k 
// <104857600=> 400k 

#ifndef TWI_DEFAULT_CONFIG_FREQUENCY
#define TWI_DEFAULT_CONFIG_FREQUENCY 26738688
#endif

// <q> TWI_DEFAULT_CONFIG_CLR_BUS_INIT  - Enables bus clearing procedure during init
 

#ifndef TWI_DEFAULT_CONFIG_CLR_BUS_INIT
#define TWI_DEFAULT_CONFIG_CLR_BUS_INIT 0
#endif

// <q> TWI_DEFAULT_CONFIG_HOLD_BUS_UNINIT  - Enables bus holding after uninit
 

#ifndef TWI_DEFAULT_CONFIG_HOLD_BUS_UNINIT
#define TWI_DEFAULT_CONFIG_HOLD_BUS_UNINIT 0
#endif

// <o> TWI_DEFAULT_CONFIG_IRQ_PRIORITY  - Interrupt priority
 

// <i> Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice
// <0=> 0 (highest) 
// <1=> 1 
// <2=> 2 
// <3=> 3 
// <4=> 4 
// <5=> 5 
// <6=> 6 
// <7=> 7 

#ifndef TWI_DEFAULT_CONFIG_IRQ_PRIORITY
#define TWI_DEFAULT_CONFIG_IRQ_PRIORITY 6
#endif

// <e> TWI0_ENABLED - Enable TWI0 instance
//==========================================================
#ifndef TWI0_ENABLED
#define TWI0_ENABLED 1
#endif
// <q> TWI0_USE_EASY_DMA  - Use EasyDMA (if present)
 

#ifndef TWI0_USE_EASY_DMA
#define TWI0_USE_EASY_DMA 1
#endif

// </e>

// <e> TWI1_ENABLED - Enable TWI1 instance
//==========================================================
#ifndef TWI1_ENABLED
#define TWI1_ENABLED 0
#endif
// <q> TWI1_USE_EASY_DMA  - Use EasyDMA (if present)
 

#ifndef TWI1_USE_EASY_DMA
#define TWI1_USE_EASY_DMA 0
#endif

// </e>

// <q> TWIM_NRF52_ANOMALY_109_WORKAROUND_ENABLED  - Enables nRF52 anomaly 109 workaround for TWIM.
 

// <i> The workaround uses interrupts to wake up the CPU by catching
// <i> the start event of zero-frequency transmission, clear the 
// <i> peripheral, set desired frequency, start the peripheral, and
// <i> the proper transmission. See more in the Errata document or
// <i> Anomaly 109 Addendum located at https://infocenter.nordicsemi.com/

#ifndef TWIM_NRF52_ANOMALY_109_WORKAROUND_ENABLED
#define TWIM_NRF52_ANOMALY_109_WORKAROUND_ENABLED 0
#endif

And the corresponding TWI NRFX settings

 

// <e> NRFX_TWIM_ENABLED - nrfx_twim - TWIM peripheral driver
//==========================================================
#ifndef NRFX_TWIM_ENABLED
#define NRFX_TWIM_ENABLED 1
#endif
// <q> NRFX_TWIM0_ENABLED  - Enable TWIM0 instance
 

#ifndef NRFX_TWIM0_ENABLED
#define NRFX_TWIM0_ENABLED 0
#endif

// <q> NRFX_TWIM1_ENABLED  - Enable TWIM1 instance
 

#ifndef NRFX_TWIM1_ENABLED
#define NRFX_TWIM1_ENABLED 0
#endif

// <o> NRFX_TWIM_DEFAULT_CONFIG_FREQUENCY  - Frequency
 
// <26738688=> 100k 
// <67108864=> 250k 
// <104857600=> 400k 

#ifndef NRFX_TWIM_DEFAULT_CONFIG_FREQUENCY
#define NRFX_TWIM_DEFAULT_CONFIG_FREQUENCY 26738688
#endif

// <q> NRFX_TWIM_DEFAULT_CONFIG_HOLD_BUS_UNINIT  - Enables bus holding after uninit
 

#ifndef NRFX_TWIM_DEFAULT_CONFIG_HOLD_BUS_UNINIT
#define NRFX_TWIM_DEFAULT_CONFIG_HOLD_BUS_UNINIT 0
#endif

// <o> NRFX_TWIM_DEFAULT_CONFIG_IRQ_PRIORITY  - Interrupt priority
 
// <0=> 0 (highest) 
// <1=> 1 
// <2=> 2 
// <3=> 3 
// <4=> 4 
// <5=> 5 
// <6=> 6 
// <7=> 7 

#ifndef NRFX_TWIM_DEFAULT_CONFIG_IRQ_PRIORITY
#define NRFX_TWIM_DEFAULT_CONFIG_IRQ_PRIORITY 6
#endif

Is the TWI_ENABLED symbol defined in your sdk_config file, and is it set to '1'? In any case, If you are not using the legacy APIs for the TWI driver, I would suggest that you instead remove the legacy symbols from your configuration file and only use the NRFX_TWIM_ configurations. That will prevent the settings from being overridden. 

Best regards,

Vidar

[apdobaj]

TWI_ENABLED was indeed set but unsetting it didnt help and there is no TWI_present setting.

[Vidar Berg]

It should be defined in the nrf52840_peripherals.h header located in /modules/nrfx/mdk/