NRF_LOG_FLOAT doesn't display negative numbers properly

Question

Platform: nRF52832 using SDK12.2 and Keil 5.20a 
 I've encountered strange corner case when displaying negative floats using NRF_LOG_DEBUG . 
 My test code looks like this: 
 float test_float=-0.99701f;

//use sprintf as reference point
char buff[50];
sprintf(buff, "sprintf: %f",test_float);

NRF_LOG_RAW_DEBUG("NRF_LOG_FLOAT:" NRF_LOG_FLOAT_MARKER " %s
", NRF_LOG_FLOAT(test_float),nrf_log_push(buff));
 
 This gives following output: NRF_LOG_FLOAT:0.99 sprintf: -0.997010 . As you can see sprintf displays correct value, NRF_LOG_FLOAT forgets minus sign. This happens for float values in range (0,-1). 
 Is this a bug in SDK or am I forgetting something in my code?

Ole Bauck · Accepted Answer

Hi, 
 You are totally correct. You can also see this from the macro definitions: 
 #define NRF_LOG_FLOAT_MARKER "%d.%02d"

#define NRF_LOG_FLOAT(val) (int32_t)(val), \
 (int32_t)(((val > 0) ? (val) - (int32_t)(val) \
 : (int32_t)(val) - (val))*100)
 
 as the integer 0 does not have a sign. 
 I will report this internally. 
 Ole