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RTT Logging not working when building with ARM GCC

AntonHellbe

Hi,

I'm trying to use RTT Logging in my application. If I build and flash my application through Segger Embedded Studio RTT logging works. However If I use ARM GCC to build the application and nrfjprog to flash RTT logging does not work. 

NRF_LOG and BACKEND_RTT is enabled in my sdk_config.h and I'm doing the following calls in main:

APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_DEFAULT_BACKENDS_INIT();


For ARM GCC I'm using the generic linker file inside the SDK folder config/nrf52840/generic_gcc_nrf52.ld, with a slight modification to the RAM_START and RAM_SIZE to allow for multiple connections. 

Are there any more modifications that needs to be done in order to enable RTT Logging when using ARM GCC? 

As a side note: UART Backend logging works without any issues when I build with ARM GCC

board: nRF52840 Preview DK

SDK: v15

Softdevice: 6.0.0

Br,
Anton

Parents
  • 0

    Hi,

    Which version of ARM GCC do you use? We have seen issues with ARM GCC 7.x.x and link time optimization (LTO). (Therefor, the SDK is still tested using version 6.3.1).

  • 0 in reply to Einar Thorsrud

    One more thing I forgot to mention in the original post is that before I changed the RAM_START and RAM_SIZE the RTT output worked. However then the application doesn't work since there is not enough memory for the softdevice. 

  • 0 in reply to Einar Thorsrud

    Hi,

    The application is verified to run on the device, I can see that the device's advertisement appears in the nRF Connect app and as stated previously UART Logging works (I have modified the print statements to make sure its the correct application running).

    To flash the device using nrfjprog I use the following commands:

    ./nrfjprog --eraseall --family NRF52
./nrfjprog --reset --program PATH_TO_SOFTDEVICE --family NRF52 --verify
./nrfjprog --reset --program PATH_TO_APPLICATION_HEX --family NRF52 --verify

  • 0 in reply to AntonHellbe

    I see, then that is not it. Could it be related to LTO somehow (similar to what is described in this post)? Do you enable LTO in your Makefile (-flto)? If so, can you see what happens if you disable it?

  • 0 in reply to Einar Thorsrud

    Fullscreen 1033.Makefile.txt Download 
    PROJECT_NAME     := checkout_pod_pca10056
TARGETS          := nrf52840_xxaa
OUTPUT_DIRECTORY := _build

SDK_ROOT := ../../../../sdk/nRF5_SDK_15.0.0_a53641a
PROJ_DIR := ../../../src

$(OUTPUT_DIRECTORY)/nrf52840_xxaa.out: \
  LINKER_SCRIPT  := checkout_pod_nrf52.ld

# Source files common to all targets
SRC_FILES += \
  $(PROJ_DIR)/ble_checkout_pod.c \
  $(PROJ_DIR)/connect_zone_service.c \
  $(PROJ_DIR)/detect_zone_advertiser.c \
  $(PROJ_DIR)/coupon_io.c \
  $(PROJ_DIR)/main.c \
  $(PROJ_DIR)/usb.c \
  $(PROJ_DIR)/application/application.c \
  $(PROJ_DIR)/application/coupon.c \
  $(PROJ_DIR)/application/coupon_entry.c \
  $(PROJ_DIR)/application/csv.c \
  $(PROJ_DIR)/application/fifo_buffer.c \
  $(PROJ_DIR)/../../common_src/adv_timer.c \
  $(PROJ_DIR)/../../common_src/ble_pod.c \
  $(PROJ_DIR)/../../common_src/gpio.c \
  $(PROJ_DIR)/../../common_src/led.c \
  $(PROJ_DIR)/../../common_src/led_blinker.c \
  $(PROJ_DIR)/../../common_src/led_service.c \
  $(SDK_ROOT)/modules/nrfx/mdk/gcc_startup_nrf52840.S \
  $(SDK_ROOT)/components/libraries/experimental_log/src/nrf_log_backend_rtt.c \
  $(SDK_ROOT)/components/libraries/experimental_log/src/nrf_log_backend_serial.c \
  $(SDK_ROOT)/components/libraries/experimental_log/src/nrf_log_backend_uart.c \
  $(SDK_ROOT)/components/libraries/experimental_log/src/nrf_log_default_backends.c \
  $(SDK_ROOT)/components/libraries/experimental_log/src/nrf_log_frontend.c \
  $(SDK_ROOT)/components/libraries/experimental_log/src/nrf_log_str_formatter.c \
  $(SDK_ROOT)/components/libraries/button/app_button.c \
  $(SDK_ROOT)/components/libraries/util/app_error.c \
  $(SDK_ROOT)/components/libraries/util/app_error_handler_gcc.c \
  $(SDK_ROOT)/components/libraries/util/app_error_weak.c \
  $(SDK_ROOT)/components/libraries/fifo/app_fifo.c \
  $(SDK_ROOT)/components/libraries/scheduler/app_scheduler.c \
  $(SDK_ROOT)/components/libraries/timer/app_timer.c \
  $(SDK_ROOT)/components/libraries/usbd/app_usbd.c \
  $(SDK_ROOT)/components/libraries/usbd/app_usbd_core.c \
  $(SDK_ROOT)/components/libraries/usbd/class/dummy/app_usbd_dummy.c \
  $(SDK_ROOT)/components/libraries/usbd/class/hid/app_usbd_hid.c \
  $(SDK_ROOT)/components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd.c \
  $(SDK_ROOT)/components/libraries/usbd/class/hid/mouse/app_usbd_hid_mouse.c \
  $(SDK_ROOT)/components/libraries/usbd/app_usbd_string_desc.c \
  $(SDK_ROOT)/components/libraries/uart/app_uart_fifo.c \
  $(SDK_ROOT)/components/libraries/util/app_util_platform.c \
  $(SDK_ROOT)/components/libraries/cli/nrf_cli.c \
  $(SDK_ROOT)/components/libraries/hardfault/hardfault_implementation.c \
  $(SDK_ROOT)/components/libraries/util/nrf_assert.c \
  $(SDK_ROOT)/components/libraries/atomic_fifo/nrf_atfifo.c \
  $(SDK_ROOT)/components/libraries/atomic_flags/nrf_atflags.c \
  $(SDK_ROOT)/components/libraries/atomic/nrf_atomic.c \
  $(SDK_ROOT)/components/libraries/balloc/nrf_balloc.c \
  $(SDK_ROOT)/components/libraries/queue/nrf_queue.c \
  $(SDK_ROOT)/external/fprintf/nrf_fprintf.c \
  $(SDK_ROOT)/external/fprintf/nrf_fprintf_format.c \
  $(SDK_ROOT)/components/libraries/fstorage/nrf_fstorage.c \
  $(SDK_ROOT)/components/libraries/fstorage/nrf_fstorage_sd.c \
  $(SDK_ROOT)/components/libraries/experimental_memobj/nrf_memobj.c \
  $(SDK_ROOT)/components/libraries/pwr_mgmt/nrf_pwr_mgmt.c \
  $(SDK_ROOT)/components/libraries/experimental_section_vars/nrf_section_iter.c \
  $(SDK_ROOT)/components/libraries/strerror/nrf_strerror.c \
  $(SDK_ROOT)/components/libraries/uart/retarget.c \
  $(SDK_ROOT)/modules/nrfx/mdk/system_nrf52840.c \
  $(SDK_ROOT)/components/boards/boards.c \
  $(SDK_ROOT)/integration/nrfx/legacy/nrf_drv_clock.c \
  $(SDK_ROOT)/integration/nrfx/legacy/nrf_drv_uart.c \
  $(SDK_ROOT)/integration/nrfx/legacy/nrf_drv_rng.c \
  $(SDK_ROOT)/modules/nrfx/drivers/src/nrfx_clock.c \
  $(SDK_ROOT)/modules/nrfx/drivers/src/nrfx_gpiote.c \
  $(SDK_ROOT)/modules/nrfx/drivers/src/nrfx_power_clock.c \
  $(SDK_ROOT)/modules/nrfx/drivers/src/prs/nrfx_prs.c \
  $(SDK_ROOT)/modules/nrfx/drivers/src/nrfx_uart.c \
  $(SDK_ROOT)/modules/nrfx/drivers/src/nrfx_uarte.c \
  $(SDK_ROOT)/modules/nrfx/drivers/src/nrfx_rng.c \
  $(SDK_ROOT)/components/drivers_nrf/usbd/nrf_drv_usbd.c \
  $(SDK_ROOT)/components/libraries/bsp/bsp.c \
  $(SDK_ROOT)/components/libraries/bsp/bsp_btn_ble.c \
  $(PROJ_DIR)/main.c \
  $(SDK_ROOT)/components/ble/common/ble_advdata.c \
  $(SDK_ROOT)/components/ble/ble_advertising/ble_advertising.c \
  $(SDK_ROOT)/components/ble/common/ble_conn_params.c \
  $(SDK_ROOT)/components/ble/common/ble_conn_state.c \
  $(SDK_ROOT)/components/ble/ble_link_ctx_manager/ble_link_ctx_manager.c \
  $(SDK_ROOT)/components/ble/common/ble_srv_common.c \
  $(SDK_ROOT)/components/ble/nrf_ble_gatt/nrf_ble_gatt.c \
  $(SDK_ROOT)/components/ble/nrf_ble_qwr/nrf_ble_qwr.c \
  $(SDK_ROOT)/components/ble/ble_services/ble_nus/ble_nus.c \
  $(SDK_ROOT)/components/softdevice/common/nrf_sdh.c \
  $(SDK_ROOT)/components/softdevice/common/nrf_sdh_ble.c \
  $(SDK_ROOT)/components/softdevice/common/nrf_sdh_soc.c \
  $(SDK_ROOT)/external/segger_rtt/SEGGER_RTT.c \
  $(SDK_ROOT)/external/segger_rtt/SEGGER_RTT_Syscalls_GCC.c \
  $(SDK_ROOT)/external/segger_rtt/SEGGER_RTT_printf.c \

# Include folders common to all targets
INC_FOLDERS += \
  $(PROJ_DIR)/ \
  $(PROJ_DIR)/application \
  $(PROJ_DIR)/../../common_src \
  $(SDK_ROOT)/components/ble/ble_services/ble_ancs_c \
  $(SDK_ROOT)/components/ble/ble_services/ble_ias_c \
  $(SDK_ROOT)/components/libraries/pwm \
  $(SDK_ROOT)/components/libraries/usbd/class/cdc/acm \
  $(SDK_ROOT)/components/libraries/usbd/class/hid/generic \
  $(SDK_ROOT)/components/libraries/usbd/class/msc \
  $(SDK_ROOT)/components/libraries/usbd/class/hid \
  $(SDK_ROOT)/modules/nrfx/hal \
  $(SDK_ROOT)/components/libraries/experimental_log \
  $(SDK_ROOT)/components/libraries/fstorage \
  $(SDK_ROOT)/components/libraries/mutex \
  $(SDK_ROOT)/components/libraries/gfx \
  $(SDK_ROOT)/components/libraries/experimental_log/src \
  $(SDK_ROOT)/components/libraries/bootloader/ble_dfu \
  $(SDK_ROOT)/components/libraries/fifo \
  $(SDK_ROOT)/components/boards \
  $(SDK_ROOT)/components/libraries/experimental_memobj \
  $(SDK_ROOT)/components/ble/ble_advertising \
  $(SDK_ROOT)/modules/nrfx/drivers/include \
  $(SDK_ROOT)/components/libraries/experimental_task_manager \
  $(SDK_ROOT)/components/softdevice/s140/headers/nrf52 \
  $(SDK_ROOT)/components/libraries/queue \
  $(SDK_ROOT)/components/libraries/pwr_mgmt \
  $(SDK_ROOT)/components/ble/ble_dtm \
  $(SDK_ROOT)/components/toolchain \
  $(SDK_ROOT)/components/toolchain/cmsis/include \
	$(SDK_ROOT)/components/toolchain/gcc \
  $(SDK_ROOT)/components/ble/common \
  $(SDK_ROOT)/components/libraries/bsp \
  $(SDK_ROOT)/components/libraries/experimental_section_vars \
  $(SDK_ROOT)/components/libraries/delay \
  $(SDK_ROOT)/components/libraries/experimental_mpu \
  $(SDK_ROOT)/components/libraries/mem_manager \
  $(SDK_ROOT)/components/libraries/usbd/config \
  $(SDK_ROOT)/components/softdevice/common \
  $(SDK_ROOT)/components/libraries/usbd/class/hid/mouse \
  $(SDK_ROOT)/components/libraries/low_power_pwm \
  $(SDK_ROOT)/external/fprintf \
  $(SDK_ROOT)/components/libraries/atomic \
  $(SDK_ROOT)/components \
  $(SDK_ROOT)/components/libraries/scheduler \
  $(SDK_ROOT)/components/libraries/cli \
  $(SDK_ROOT)/components/ble/ble_services/ble_lbs \
  $(SDK_ROOT)/components/ble/ble_services/ble_hts \
  $(SDK_ROOT)/components/ble/ble_services/ble_cts_c \
  $(SDK_ROOT)/components/libraries/util \
  ../config \
  $(SDK_ROOT)/components/libraries/usbd/class/cdc \
  $(SDK_ROOT)/components/libraries/csense \
  $(SDK_ROOT)/components/libraries/balloc \
  $(SDK_ROOT)/components/libraries/ecc \
  $(SDK_ROOT)/components/libraries/hardfault \
  $(SDK_ROOT)/components/libraries/uart \
  $(SDK_ROOT)/components/libraries/hci \
  $(SDK_ROOT)/components/libraries/usbd/class/hid/kbd \
  $(SDK_ROOT)/components/libraries/timer \
  $(SDK_ROOT)/components/softdevice/s140/headers \
  $(SDK_ROOT)/integration/nrfx \
  $(SDK_ROOT)/components/libraries/sortlist \
  $(SDK_ROOT)/components/libraries/spi_mngr \
  $(SDK_ROOT)/components/libraries/experimental_stack_guard \
  $(SDK_ROOT)/components/libraries/led_softblink \
  $(SDK_ROOT)/components/libraries/sdcard \
  $(SDK_ROOT)/modules/nrfx/mdk \
  $(SDK_ROOT)/components/ble/ble_link_ctx_manager \
  $(SDK_ROOT)/components/libraries/strerror \
  $(SDK_ROOT)/components/libraries/crc32 \
  $(SDK_ROOT)/components/libraries/usbd/class/audio \
  $(SDK_ROOT)/components/ble/peer_manager \
  $(SDK_ROOT)/components/drivers_nrf/usbd \
  $(SDK_ROOT)/components/ble/nrf_ble_gatt \
  $(SDK_ROOT)/components/ble/nrf_ble_qwr \
  $(SDK_ROOT)/components/libraries/gpiote \
  $(SDK_ROOT)/components/libraries/button \
  $(SDK_ROOT)/modules/nrfx \
  $(SDK_ROOT)/integration/nrfx/legacy \
  $(SDK_ROOT)/components/libraries/usbd \
  $(SDK_ROOT)/components/libraries/block_dev \
  $(SDK_ROOT)/external/segger_rtt \
  $(SDK_ROOT)/components/libraries/atomic_fifo \
  $(SDK_ROOT)/components/libraries/experimental_ringbuf \
  $(SDK_ROOT)/components/libraries/fds \
  $(SDK_ROOT)/components/libraries/atomic_flags \

# Libraries common to all targets
LIB_FILES += \

# Optimization flags
OPT = -O3 -g3
# Uncomment the line below to enable link time optimization
#OPT += -flto

# C flags common to all targets
CFLAGS += $(OPT)
CFLAGS += -DBOARD_PCA10056
CFLAGS += -DCONFIG_GPIO_AS_PINRESET
CFLAGS += -DFLOAT_ABI_HARD
CFLAGS += -DNRF52840_XXAA
CFLAGS += -DNRF_SD_BLE_API_VERSION=6
CFLAGS += -DS140
CFLAGS += -DSOFTDEVICE_PRESENT
CFLAGS += -DSWI_DISABLE0
CFLAGS += -DHW_NINA_B3
CFLAGS += -mcpu=cortex-m4
CFLAGS += -mthumb -mabi=aapcs
CFLAGS += -Wall -Werror -Wno-unused-result -Wunused-value -Wunused-local-typedefs
CFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16
# keep every function in a separate section, this allows linker to discard unused ones
CFLAGS += -ffunction-sections -fdata-sections -fno-strict-aliasing
CFLAGS += -fno-builtin -fshort-enums

# C++ flags common to all targets
CXXFLAGS += $(OPT)

# Assembler flags common to all targets
ASMFLAGS += -g3
ASMFLAGS += -mcpu=cortex-m4
ASMFLAGS += -mthumb -mabi=aapcs
ASMFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16
ASMFLAGS += -DBOARD_PCA10056
ASMFLAGS += -DCONFIG_GPIO_AS_PINRESET
ASMFLAGS += -DFLOAT_ABI_HARD
ASMFLAGS += -DNRF52840_XXAA
ASMFLAGS += -DNRF_SD_BLE_API_VERSION=6
ASMFLAGS += -DS140
ASMFLAGS += -DSOFTDEVICE_PRESENT
ASMFLAGS += -DSWI_DISABLE0

# Linker flags
LDFLAGS += $(OPT)
LDFLAGS += -mthumb -mabi=aapcs -L$(SDK_ROOT)/modules/nrfx/mdk -T$(LINKER_SCRIPT)
LDFLAGS += -mcpu=cortex-m4
LDFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16
# let linker dump unused sections
LDFLAGS += -Wl,--gc-sections
# use newlib in nano version
LDFLAGS += --specs=nano.specs

nrf52840_xxaa: CFLAGS += -D__HEAP_SIZE=8192
nrf52840_xxaa: CFLAGS += -D__STACK_SIZE=8192
nrf52840_xxaa: ASMFLAGS += -D__HEAP_SIZE=8192
nrf52840_xxaa: ASMFLAGS += -D__STACK_SIZE=8192

# Add standard libraries at the very end of the linker input, after all objects
# that may need symbols provided by these libraries.
LIB_FILES += -lc -lnosys -lm


.PHONY: default help

# Default target - first one defined
default: nrf52840_xxaa

# Print all targets that can be built
help:
	@echo following targets are available:
	@echo		nrf52840_xxaa
	@echo		flash_softdevice
	@echo		sdk_config - starting external tool for editing sdk_config.h
	@echo		flash      - flashing binary

TEMPLATE_PATH := $(SDK_ROOT)/components/toolchain/gcc


include $(TEMPLATE_PATH)/Makefile.common

$(foreach target, $(TARGETS), $(call define_target, $(target)))

.PHONY: flash flash_softdevice erase

# Flash the program
flash: $(OUTPUT_DIRECTORY)/nrf52840_xxaa.hex
	@echo Flashing: $<
	nrfjprog -f nrf52 --program $< --sectorerase
	nrfjprog -f nrf52 --reset

# Flash softdevice
flash_softdevice:
	@echo Flashing: s140_nrf52_6.0.0_softdevice.hex
	nrfjprog -f nrf52 --program $(SDK_ROOT)/components/softdevice/s140/hex/s140_nrf52_6.0.0_softdevice.hex --sectorerase
	nrfjprog -f nrf52 --reset

erase:
	nrfjprog -f nrf52 --eraseall

SDK_CONFIG_FILE := ../config/sdk_config.h
CMSIS_CONFIG_TOOL := $(SDK_ROOT)/external_tools/cmsisconfig/CMSIS_Configuration_Wizard.jar
sdk_config:
	java -jar $(CMSIS_CONFIG_TOOL) $(SDK_CONFIG_FILE)

    LTO was/is disabled. I have uploaded my Makefile as a txt file if you want to look at it. 

  • 0 in reply to AntonHellbe

    Yes, it would be very useful if you could reproduce this from an example project and upload the project here. Then I would hopefully be able to reproduce it on my side as well.

  • 0 in reply to Einar Thorsrud

    Hi,

    I can reproduce the issue. I used the example project ble_app_hrs. These are the following steps I took:

    1. Increase Peripheral Link Count and Total Link count to 20 in sdk_config.h
    2. Decrease the GATT and GAP data length to make enough memory for the Softdevice according to this thread: Nordic semi devzone
    3. Change the RAM ORIGIN to 0x20015290 and LENGTH to 0x2AD70

    Br,

    Anton

Reply Children
  • +1 in reply to AntonHellbe

    Hi Anton,

    Unfortunately, I have not been able to test this again on my side yet due to a busy morning, but I noticed something which I should have spotted earlier. In the printout from JLinkExe I see that you use the configuration for NRF52832_XXAA. So I suspect that what may be happening is that the RTT client is only looking for the RTT buffer within the nRF52832 RAM region, and this only have 64 kB RAM compared to 256 kB in the nRf52840. If the RTT buffer is placed in the upper half this is not found. If this is correct, then it sould be fixed by specifying that you have a nRF52840 device so that the RTT client will look for the RTT buffer in all of the RAM.

  • 0 in reply to Einar Thorsrud

    Hi Einar,

    Your suspicion were correct. After I changed the configuration to NRF52840_XXAA It started to print the RTT logs. Thank you very much for your assistance!

    Br,
    Anton

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