Logging with timestamp on SDK 15.2

Question

i have recently upgraded to SDK 15.2, and since doing so I am struggling to get timestamps working in the logger. 
 I am initialising the logger here: 
 //Start microsecond timer:
 us_timer_config();
 ret_code_t err_code = NRF_LOG_INIT(time_us);
 APP_ERROR_CHECK(err_code);
 
 And here is my microsecond timer. 
 #include "velo_us_timer.h"
//
const nrf_drv_timer_t us_timer = NRF_DRV_TIMER_INSTANCE(1);


void us_timer_config(void)
{
	uint32_t err_code=NRF_SUCCESS;
 nrf_drv_timer_config_t timer_cfg = 
	{
 .frequency = NRF_TIMER_FREQ_1MHz,	//Sets prescaler to get a counter increment at 1MHz.
 .mode = NRF_TIMER_MODE_TIMER, // in this mode counter increments by 1 on each clock cycle (clock x prescaler actually)
 .bit_width = NRF_TIMER_BIT_WIDTH_32, 
 .interrupt_priority = TIMER_DEFAULT_CONFIG_IRQ_PRIORITY, 
 .p_context = NULL 
 
	};
 err_code=nrf_drv_timer_init(&us_timer,&timer_cfg,us_timer_event_handler);
 APP_ERROR_CHECK(err_code);
 nrf_drv_timer_enable(&us_timer);
}

// Timestamp function for logging
uint32_t time_us(void)
{
	uint32_t time = nrf_drv_timer_capture(&us_timer,NRF_TIMER_CC_CHANNEL0);
	return time;
} 
 When I log (using NRF_LOG_INFO("comment")) no timestamp appears. This code worked in SDK 14.2 . Any ideas what I'm misssing? Thank you.

Simonr · Accepted Answer

Hi 
 You can use the example SDK15.2\examples\ble_peripheral\experimental\ble_app_cli as a template, and look at the core_init function there. Also,make sure you have enabled NRF_LOG_USES_TIMESTAMP in your config file, set NRF_LOG_TIMESTAMP_DEFAULT_FREQUENCY as 0 to use the app_timer frequency, or set the frequency yourself. 
 Best regards, 
 Simon 
 EDIT: I think I found an easier starting point, as the aforementioned project might be confusing. You can look at the SDK15.2\examples\ble_peripheral\ble_app_hrs example instead, here too make sure to enable NRF_LOG_USES_TIMESTAMP, and use app_timer as the frequency variable (at least I did). Then run NRF_LOG_INIT(app_timer_cnt_get), by default that function is NRF_LOG_INIT(NULL) so you have to change that. 
 Also I don't know if you are using UART or RTT as a backend, but I recommend RTT as UART might mix up the timestamp info depending on what terminal you are using.

Logging with timestamp on SDK 15.2

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