BLE Power consumption after BLE.end() #149
Description
Hi,
Related to #65 and the fix #92, BLE.end() still draw around ~0.5 mA on NANO 33 BLE Sense.
@facchinm mentioned that the CordioHCIHook doesn't shut down the radio (#65 (comment)).
So I tried inserting NRF_RADIO->TASKS_STOP = 1; or/and NRF_RADIO->TASKS_DISABLE = 1; after BLE.end() with no success (wishful thinking I believe :)).
This sketch is around ~ 1.562 mA
#include <ArduinoBLE.h>
BLEService serv("19B10010-E8F2-537E-4F6C-D104768A1214");
BLEByteCharacteristic charac("747ce3a8-3588-11eb-adc1-0242ac120002", BLERead | BLENotify);
void setup() {
digitalWrite(LED_PWR, LOW);
Serial.begin(9600);
while(!Serial);
if (!BLE.begin()){
Serial.print("NO BLE");
while(1);
} else {
Serial.println("BLE Started");
}
BLE.setLocalName("TEST_BLE_Power");
BLE.setAdvertisedService(serv);
serv.addCharacteristic(charac);
BLE.addService(serv);
BLE.setAdvertisingInterval(1600);
BLE.advertise();
BLE.end();
}
void loop() {
delay(1000);
}
The same sketch without the BLE.begin() (without starting then stopping back BLE) is around ~1.067 mA
#include <ArduinoBLE.h>
BLEService serv("19B10010-E8F2-537E-4F6C-D104768A1214");
BLEByteCharacteristic charac("747ce3a8-3588-11eb-adc1-0242ac120002", BLERead | BLENotify);
void setup() {
digitalWrite(LED_PWR, LOW);
Serial.begin(9600);
while(!Serial);
/*if (!BLE.begin()){
Serial.print("NO BLE");
while(1);
} else {
Serial.println("BLE Started");
}*/
BLE.setLocalName("TEST_BLE_Power");
BLE.setAdvertisedService(serv);
serv.addCharacteristic(charac);
BLE.addService(serv);
BLE.setAdvertisingInterval(1600);
BLE.advertise();
BLE.end();
}
void loop() {
delay(1000);
}
If I run the same sketches without Serial.begin() & no USB cable connected the consumption goes down of course but the BLE.end() "cost" stays the same.
I am trying to get as much low power consumption as possible for my project and I am actually down to around ~205uA without radio. With radio on only for TX when needed, everything would be set for months on battery. Still need to find a solution for the BLE Off power draw.
I tried digging in the Arduino BLE library but it is way beyond my knowledge & skill.
Any ideas how to go about this? Any help is welcome.