Add a non-Arduino, nrf5 SDK only blinky playground project

code/playground/nrf_sdk/blinky/.gitignore

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+_build

code/playground/nrf_sdk/blinky/Makefile

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+PROJECT_NAME     := blinky_pca10100e
+TARGETS          := nrf52820_xxaa
+OUTPUT_DIRECTORY := _build
+
+# SDK_ROOT := ../../../../../..
+# PROJ_DIR := ../../..
+PROJ_DIR := ./src
+
+$(OUTPUT_DIRECTORY)/nrf52820_xxaa.out: \
+  LINKER_SCRIPT  := blinky_gcc_nrf52.ld
+
+# Source files common to all targets
+SRC_FILES += \
+  $(SDK_ROOT)/modules/nrfx/mdk/gcc_startup_nrf52820.S \
+  $(SDK_ROOT)/components/libraries/log/src/nrf_log_frontend.c \
+  $(SDK_ROOT)/components/libraries/log/src/nrf_log_str_formatter.c \
+  $(SDK_ROOT)/components/boards/boards.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/util/app_util_platform.c \
+  $(SDK_ROOT)/components/libraries/util/nrf_assert.c \
+  $(SDK_ROOT)/components/libraries/atomic/nrf_atomic.c \
+  $(SDK_ROOT)/components/libraries/balloc/nrf_balloc.c \
+  $(SDK_ROOT)/external/fprintf/nrf_fprintf.c \
+  $(SDK_ROOT)/external/fprintf/nrf_fprintf_format.c \
+  $(SDK_ROOT)/components/libraries/memobj/nrf_memobj.c \
+  $(SDK_ROOT)/components/libraries/ringbuf/nrf_ringbuf.c \
+  $(SDK_ROOT)/components/libraries/strerror/nrf_strerror.c \
+  $(SDK_ROOT)/modules/nrfx/soc/nrfx_atomic.c \
+  $(PROJ_DIR)/main.c \
+  $(SDK_ROOT)/modules/nrfx/mdk/system_nrf52820.c \
+
+# Include folders common to all targets
+INC_FOLDERS += \
+  $(SDK_ROOT)/components \
+  $(SDK_ROOT)/modules/nrfx/mdk \
+  $(PROJ_DIR) \
+  $(SDK_ROOT)/components/libraries/strerror \
+  $(SDK_ROOT)/components/toolchain/cmsis/include \
+  $(SDK_ROOT)/components/libraries/util \
+  ./config \
+  $(SDK_ROOT)/components/libraries/balloc \
+  $(SDK_ROOT)/components/libraries/ringbuf \
+  $(SDK_ROOT)/modules/nrfx/hal \
+  $(SDK_ROOT)/components/libraries/bsp \
+  $(SDK_ROOT)/components/libraries/log \
+  $(SDK_ROOT)/modules/nrfx \
+  $(SDK_ROOT)/components/libraries/experimental_section_vars \
+  $(SDK_ROOT)/components/libraries/delay \
+  $(SDK_ROOT)/integration/nrfx \
+  $(SDK_ROOT)/components/drivers_nrf/nrf_soc_nosd \
+  $(SDK_ROOT)/components/libraries/atomic \
+  $(SDK_ROOT)/components/boards \
+  $(SDK_ROOT)/components/libraries/memobj \
+  $(SDK_ROOT)/external/fprintf \
+  $(SDK_ROOT)/components/libraries/log/src \
+
+# 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_PCA10100
+CFLAGS += -DBSP_DEFINES_ONLY
+CFLAGS += -DCONFIG_GPIO_AS_PINRESET
+CFLAGS += -DDEVELOP_IN_NRF52833
+CFLAGS += -DFLOAT_ABI_SOFT
+CFLAGS += -DNRF52820_XXAA
+CFLAGS += -DNRFX_COREDEP_DELAY_US_LOOP_CYCLES=3
+CFLAGS += -mcpu=cortex-m4
+CFLAGS += -mthumb -mabi=aapcs
+CFLAGS += -Wall -Werror
+CFLAGS += -mfloat-abi=soft
+# 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=soft
+ASMFLAGS += -DBOARD_PCA10100
+ASMFLAGS += -DBSP_DEFINES_ONLY
+ASMFLAGS += -DCONFIG_GPIO_AS_PINRESET
+ASMFLAGS += -DDEVELOP_IN_NRF52833
+ASMFLAGS += -DFLOAT_ABI_SOFT
+ASMFLAGS += -DNRF52820_XXAA
+ASMFLAGS += -DNRFX_COREDEP_DELAY_US_LOOP_CYCLES=3
+
+# Linker flags
+LDFLAGS += $(OPT)
+LDFLAGS += -mthumb -mabi=aapcs -L$(SDK_ROOT)/modules/nrfx/mdk -T$(LINKER_SCRIPT)
+LDFLAGS += -mcpu=cortex-m4
+# let linker dump unused sections
+LDFLAGS += -Wl,--gc-sections
+# use newlib in nano version
+LDFLAGS += --specs=nano.specs
+
+nrf52820_xxaa: CFLAGS += -D__HEAP_SIZE=4096
+nrf52820_xxaa: CFLAGS += -D__STACK_SIZE=4096
+nrf52820_xxaa: ASMFLAGS += -D__HEAP_SIZE=4096
+nrf52820_xxaa: ASMFLAGS += -D__STACK_SIZE=4096
+
+# 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: nrf52820_xxaa
+
+# Print all targets that can be built
+help:
+	@echo following targets are available:
+	@echo		nrf52820_xxaa
+	@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 erase
+
+# Flash the program
+flash: default
+	@echo Flashing: $(OUTPUT_DIRECTORY)/nrf52820_xxaa.hex
+	nrfjprog -f nrf52 --program $(OUTPUT_DIRECTORY)/nrf52820_xxaa.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)

code/playground/nrf_sdk/blinky/blinky_gcc_nrf52.ld

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+/* Linker script to configure memory regions. */
+
+SEARCH_DIR(.)
+GROUP(-lgcc -lc -lnosys)
+
+MEMORY
+{
+  FLASH (rx) : ORIGIN = 0x0, LENGTH = 0x40000
+  RAM (rwx) :  ORIGIN = 0x20000000, LENGTH = 0x8000
+}
+
+SECTIONS
+{
+}
+
+SECTIONS
+{
+  . = ALIGN(4);
+  .mem_section_dummy_ram :
+  {
+  }
+  .log_dynamic_data :
+  {
+    PROVIDE(__start_log_dynamic_data = .);
+    KEEP(*(SORT(.log_dynamic_data*)))
+    PROVIDE(__stop_log_dynamic_data = .);
+  } > RAM
+  .log_filter_data :
+  {
+    PROVIDE(__start_log_filter_data = .);
+    KEEP(*(SORT(.log_filter_data*)))
+    PROVIDE(__stop_log_filter_data = .);
+  } > RAM
+
+} INSERT AFTER .data;
+
+SECTIONS
+{
+  .mem_section_dummy_rom :
+  {
+  }
+  .log_const_data :
+  {
+    PROVIDE(__start_log_const_data = .);
+    KEEP(*(SORT(.log_const_data*)))
+    PROVIDE(__stop_log_const_data = .);
+  } > FLASH
+  .log_backends :
+  {
+    PROVIDE(__start_log_backends = .);
+    KEEP(*(SORT(.log_backends*)))
+    PROVIDE(__stop_log_backends = .);
+  } > FLASH
+    .nrf_balloc :
+  {
+    PROVIDE(__start_nrf_balloc = .);
+    KEEP(*(.nrf_balloc))
+    PROVIDE(__stop_nrf_balloc = .);
+  } > FLASH
+
+} INSERT AFTER .text
+
+
+INCLUDE "nrf_common.ld"

code/playground/nrf_sdk/blinky/src/main.c

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+#include <stdbool.h>
+#include <stdint.h>
+#include "nrf_delay.h"
+#include "nrf_gpio.h"
+
+#define LED_PIN 3
+
+int main(void) {
+  nrf_gpio_cfg_output(LED_PIN);
+  while (true) {
+    nrf_gpio_pin_toggle(LED_PIN);
+    nrf_delay_ms(500);
+  }
+}