SDK15.2 FreeRTOS Consumes high current when SD enabled

RE: SDK15.2 FreeRTOS Consumes high current when SD enabled

Susheel Nuguru — Wed, 08 May 2019 11:08:21 GMT

7mA does not look normal on tickless idle on PCA10040, can you please give me your project for a quick smoke test.

RE: SDK15.2 FreeRTOS Consumes high current when SD enabled

Dave_couling — Mon, 06 May 2019 18:12:10 GMT

Please note all my tests have been run on both the PCA10040 and custom hardware. Testing on both my own firmware platform, and the hrs_freertos example in SDK 15.2

RE: SDK15.2 FreeRTOS Consumes high current when SD enabled

Dave_couling — Mon, 06 May 2019 17:21:20 GMT

If I enforce my own while(1){ sd_app_evt_wait();} after I initialize the Softdevice, it Idles at the expected current. But when I let the port_cmsis_systick.c file handle the idle loop the current consumption goes back up. In fact with sd_app_evt_wait(); enabled in that file, consumption idles high ~7mA. I did a compare of my port_cmsis_systick.c compared to SDK 15.2, and they are essentially the same. Were there any other fixes implemented under the hood for freeRTOS in 15.3?

RE: SDK15.2 FreeRTOS Consumes high current when SD enabled

Dave_couling — Mon, 06 May 2019 16:56:19 GMT

sd_app_evt_wait(); idles at an even higher current then using _WFE

I've also noted that even placing a while(1){ _WFE();} shows an idle current of 0.8mA. Simply initializing the Softdevice is causing this consumption, regarding of whether theres radio activity or not.

RE: SDK15.2 FreeRTOS Consumes high current when SD enabled

Susheel Nuguru — Mon, 06 May 2019 10:08:43 GMT

can you do a simple idle test with the following change in SDK\external\freertos\portable\CMSIS\port_cmsis_systick.c file-> vPortSuppressTicksAndSleep()

#if 0  
#ifdef SOFTDEVICE_PRESENT
            if (nrf_sdh_is_enabled())
            {
                uint32_t err_code = sd_app_evt_wait();
                APP_ERROR_CHECK(err_code);
            }
            else
#endif
#endif // (NRFFOSDK-11174)

Notice the addition of #if 0 and #endif which forces the function to use __WFE instead.and see if you have better results?