printf() command doesn't work after calling a funcation

[Yujiro]

Hi,

I am working with ppg sensor to calculate heart rate and spo2. I collected data and printed it on RTT for first cycle values are printing on RTT. But after  collecting 500 samples I am calling a function to calculate HR  and SPO2, which have it own .c and .h files. So when this function is called printf()  stops showing any values on terminal. I know function code is working fine as i can see the values being update on debugger. 

So if anyone have experience on that .

Thank you 

Yujiro

[Yujiro]

It is nRF5 SDK. 

[Sigurd]

Ok, printf only calls app_uart_put() (if you have retarget.c), so maybe you could debug your application, and e.g. check if app_uart_put() is returning some error-code.