Hi.
I'm little worried about our bt sensor power consumption.
We are using twi/i2c to communicate with sensors periodically. We are using app timer to trigger these events and with some sensors we use hw interrupt.
Anyho I observed that there's 4.3-5mA consumption going on pretty much no matter I do. I even made a build, where there's nothing else done than waiting for event:
void main (void) {
for(;;) {
// Enter System ON sleep mode
__WFE();
// Make sure any pending events are cleared
__SEV();
__WFE();
}
}
Still the power consumption is quite large. I don't have uart tracing on in Makefile.
#flags common to all targets
CFLAGS = -DNRF52
CFLAGS += -DSOFTDEVICE_PRESENT
CFLAGS += -DBOARD_PCA10040
CFLAGS += -DNRF52_PAN_12
CFLAGS += -DNRF52_PAN_15
CFLAGS += -DNRF52_PAN_58
CFLAGS += -DNRF52_PAN_55
CFLAGS += -DNRF52_PAN_54
CFLAGS += -DNRF52_PAN_31
CFLAGS += -DNRF52_PAN_30
CFLAGS += -DNRF52_PAN_51
CFLAGS += -DNRF52_PAN_36
CFLAGS += -DNRF52_PAN_53
#CFLAGS += -DNRF_LOG_USES_UART=1
CFLAGS += -DS132
CFLAGS += -DCONFIG_GPIO_AS_PINRESET
CFLAGS += -DBLE_STACK_SUPPORT_REQD
CFLAGS += -DSWI_DISABLE0
CFLAGS += -DNRF52_PAN_20
CFLAGS += -DNRF52_PAN_64
CFLAGS += -DNRF52_PAN_62
CFLAGS += -DNRF52_PAN_63
CFLAGS += -mcpu=cortex-m4
CFLAGS += -mthumb -mabi=aapcs --std=gnu99
CFLAGS += -Wall -O3 -g3
CFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16
# keep every function in separate section. This will allow linker to dump unused functions
CFLAGS += -ffunction-sections -fdata-sections -fno-strict-aliasing
CFLAGS += -fno-builtin --short-enums
# keep every function in separate section. This will allow linker to dump unused functions
LDFLAGS += -Xlinker -Map=$(LISTING_DIRECTORY)/$(OUTPUT_FILENAME).map
LDFLAGS += -mthumb -mabi=aapcs -L $(TEMPLATE_PATH) -T$(LINKER_SCRIPT)
LDFLAGS += -mcpu=cortex-m4
LDFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16
# let linker to dump unused sections
LDFLAGS += -Wl,--gc-sections
# use newlib in nano version
LDFLAGS += --specs=nano.specs -lc -lnosys
# Assembler flags
ASMFLAGS += -x assembler-with-cpp
ASMFLAGS += -DNRF52
ASMFLAGS += -DSOFTDEVICE_PRESENT
ASMFLAGS += -DBOARD_PCA10040
ASMFLAGS += -DNRF52_PAN_12
ASMFLAGS += -DNRF52_PAN_15
ASMFLAGS += -DNRF52_PAN_58
ASMFLAGS += -DNRF52_PAN_55
ASMFLAGS += -DNRF52_PAN_54
ASMFLAGS += -DNRF52_PAN_31
ASMFLAGS += -DNRF52_PAN_30
ASMFLAGS += -DNRF52_PAN_51
ASMFLAGS += -DNRF52_PAN_36
ASMFLAGS += -DNRF52_PAN_53
ASMFLAGS += -DNRF_LOG_USES_UART=1
ASMFLAGS += -DS132
ASMFLAGS += -DCONFIG_GPIO_AS_PINRESET
ASMFLAGS += -DBLE_STACK_SUPPORT_REQD
ASMFLAGS += -DSWI_DISABLE0
ASMFLAGS += -DNRF52_PAN_20
ASMFLAGS += -DNRF52_PAN_64
ASMFLAGS += -DNRF52_PAN_62
ASMFLAGS += -DNRF52_PAN_63
With this setup I can measure (from USB) 4.39mA consumption.
Ideas?
Build made with gcc, no peripherals attached to board (altough there has been before if that matters), I've run also the "nrfjprog -f nrf52 -p" to disable debug mode.
