nRF52 SAADC, which timer

[wpb3dm]

Hi,

nRF5_SDK_11.0.0_89a8197\examples\peripheral\saadc\pca10040\arm5_no_packs

Which timer is used in this example? RTC timer or Timer0-4 ? I can not find it.

Thanks!

[Jui-Chou (Rick) Chung]

This example using Timer0 to generate regular compare event. At the beginning of the code, it declared a timer instance using NRF_DRV_TIMER_INSTANCE(0). Take a look at this macro:

/**
 * @brief Macro for creating a timer driver instance.
 */
#define NRF_DRV_TIMER_INSTANCE(id) \
{                                                             \ 
    .p_reg            = CONCAT_2(NRF_TIMER, id),              \ 
    .instance_id      = CONCAT_3(TIMER, id, _INSTANCE_INDEX), \ 
    .cc_channel_count = NRF_TIMER_CC_CHANNEL_COUNT(id),       \ 
} 

And also, in the config/nrf_drv_config.h, you can find:

/* TIMER */
#define TIMER0_ENABLED 1

#if (TIMER0_ENABLED == 1)
#define TIMER0_CONFIG_FREQUENCY    NRF_TIMER_FREQ_16MHz
#define TIMER0_CONFIG_MODE         TIMER_MODE_MODE_Timer
#define TIMER0_CONFIG_BIT_WIDTH    TIMER_BITMODE_BITMODE_32Bit
#define TIMER0_CONFIG_IRQ_PRIORITY APP_IRQ_PRIORITY_LOW

#define TIMER0_INSTANCE_INDEX      0
#endif

[wpb3dm]

Thanks! I find it.