How to use NRF51 DK I2C(TWI) with SDK 12.2 with Keil MDK?

[fenogy]

I need to connect VL53Xl to NRF51 DK> I am using latest 12.2 SDK with Keil MDK.I cannot find any I2C(TWI) example. I can find examples for NRF52 based devices. but not for NRF51.

I tried using Hal functions but ended up with missing definitions which are only available with NRF52 devices.

Pls help

[bjorn-spockeli]

TWI0_USE_EASY_DMA is defined in the sdk_config.h file in the twi_sensor example, but not in the sdk_config.hfile of the ble_app_uart example. You will have to copy the TWI_ENABLED section starting from line 74 to 208 into the sdk_config.h file of the ble_app_uart example.

[fenogy]

@Bjorn Thanks for the reply. I tested sdk_config.h earlier and ble_app_uart sdk_config.h had the TWI_ENABLED section already. I tested functionality of sdk_config.h by using some #warning and it was observed the TWI ENABLED section is not got executed for some weird reason. I removed definitions check points by directly defining them as below and now compilation is ok. This is bad but I cant find any other issue.

// <e> TWI_ENABLED - nrf_drv_twi - TWI/TWIM peripheral driver
//==========================================================
#ifndef TWI_ENABLED
#define TWI_ENABLED 0
#endif

//#if  TWI_ENABLED
// <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 

#ifndef TWI_DEFAULT_CONFIG_IRQ_PRIORITY
#define TWI_DEFAULT_CONFIG_IRQ_PRIORITY 3
#endif

// <e> TWI0_ENABLED - Enable TWI0 instance
//==========================================================
#ifndef TWI0_ENABLED
#define TWI0_ENABLED 0
 
#endif
//#if  TWI0_ENABLED
// <q> TWI0_USE_EASY_DMA  - Use EasyDMA (if present)


#ifndef TWI0_USE_EASY_DMA
#define TWI0_USE_EASY_DMA 0

#endif

//#endif //TWI0_ENABLED
// </e>

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

#ifndef TWI1_USE_EASY_DMA
#define TWI1_USE_EASY_DMA 0
#endif

#endif //TWI1_ENABLED
// </e>

// <e> TWI_CONFIG_LOG_ENABLED - Enables logging in the module.
//==========================================================
#ifndef TWI_CONFIG_LOG_ENABLED
#define TWI_CONFIG_LOG_ENABLED 0
#endif
#if  TWI_CONFIG_LOG_ENABLED
// <o> TWI_CONFIG_LOG_LEVEL  - Default Severity level
 
// <0=> Off 
// <1=> Error 
// <2=> Warning 
// <3=> Info 
// <4=> Debug 

#ifndef TWI_CONFIG_LOG_LEVEL
#define TWI_CONFIG_LOG_LEVEL 3
#endif

// <o> TWI_CONFIG_INFO_COLOR  - ANSI escape code prefix.
 
// <0=> Default 
// <1=> Black 
// <2=> Red 
// <3=> Green 
// <4=> Yellow 
// <5=> Blue 
// <6=> Magenta 
// <7=> Cyan 
// <8=> White 

#ifndef TWI_CONFIG_INFO_COLOR
#define TWI_CONFIG_INFO_COLOR 0
#endif

// <o> TWI_CONFIG_DEBUG_COLOR  - ANSI escape code prefix.
 
// <0=> Default 
// <1=> Black 
// <2=> Red 
// <3=> Green 
// <4=> Yellow 
// <5=> Blue 
// <6=> Magenta 
// <7=> Cyan 
// <8=> White 

#ifndef TWI_CONFIG_DEBUG_COLOR
#define TWI_CONFIG_DEBUG_COLOR 0
#endif

#endif //TWI_CONFIG_LOG_ENABLED
// </e>

//#endif //TWI_ENABLED

[bjorn-spockeli]

Did you change the

#ifndef TWI1_ENABLED
#define TWI1_ENABLED 0

to

#ifndef TWI1_ENABLED
#define TWI1_ENABLED 1 

in the ble_app_uart sdk_config.h file?

[fenogy]

@Bjorn Thanks, I removed existing TWI section from ble_app_uart sdk_config.h and pasted the same from twi_sensor sdk_config and its compile now. Thank you very much. saved hours.

[bjorn-spockeli]

Happy to help :)