Upload to flash works OK

Makefile

@@ -45,3 +45,5 @@ SDK_DRIVERS_NRF_HAL=yes
 include misc/nRF51_Devices.mk
 include misc/SDK_Makefile.mk
 include misc/Makefile
+include misc/nrftools_jlink.mk
+include misc/check.mk

misc/Makefile

@@ -52,7 +52,8 @@ LINKER_SCRIPT_TOP_DIR ?= $(SDK_PATH)/components/toolchain/gcc
 LINKER_SCRIPT ?= $(LINKER_SCRIPT_TOP_DIR)/gcc_nrf51_$(SOFTDEVICE)_$(LINKER_FILE_SUFFIX).ld
 LDFLAGS += $(CPUFLAGS)  -T $(LINKER_SCRIPT) -L $(LINKER_SCRIPT_TOP_DIR)
 
-
+# from 
+FLASH_START_ADDRESS = $(shell $(OBJDUMP) -h $(ELF) -j .text | grep .text | awk '{print $$4}')
 test:
 	@echo "Source : " $(C_SOURCE_FILES)
 	@echo "Source AS: " $(SRCS_AS)
@@ -69,6 +70,9 @@ $(HEX): $(OBJS) $(OBJS_AS)
 	$(SIZE) $(ELF)
 
 
+print_flash_address:
+	@echo "Flash address " $(FLASH_START_ADDRESS)
+
 %.o: %.c
 
 	$(CC) $(LDFLAGS) $(CFLAGS) $< -o $@

misc/check.mk

@@ -0,0 +1,34 @@
+NO_COLOR=\e[0m
+OK_COLOR=\e[32;01m
+ERROR_COLOR=\e[31;01m
+WARN_COLOR='\e[33;01m'
+
+OK_STRING=$(OK_COLOR)[OK]$(NO_COLOR)
+ERROR_STRING=$(ERROR_COLOR)[ERROR]$(NO_COLOR)
+WARN_STRING=$(WARN_COLOR)[WARNING]$(NO_COLOR)
+
+
+check_file_func = \
+	@if [ -a $(1) ]; \
+	then \
+	echo -e "$(OK_STRING) $(2) File $(1) found";\
+	else \
+	echo -e "$(ERROR_STRING) $(2) File $(1) not found";\
+	fi;
+
+check_exec_func = \
+	@if [ -x $(1) ]; \
+	then \
+	echo -e "$(OK_STRING) $(2) File $(1) found";\
+	else \
+	echo -e "$(ERROR_STRING) $(2) File $(1) not found";\
+	fi;
+
+
+
+
+
+check_setup:
+	$(call check_exec_func,$(shell which nrftool),"nrf51 JLink programmer : ")
+	$(call check_exec_func,$(shell which $(CC)),  "GCC for ARM compiler   : ")
+

misc/nrftools_jlink.mk

@@ -0,0 +1,19 @@
+# Using nrftool utiliy to do the erase/programming
+# it avoid to deal directly with scripts as
+# done in nrf51-pure-gcc-setup
+
+PROGRAMMER ?= nrftool
+
+JLINKEXE=JLinkExe
+
+JLINKEXE_PATH=$(shell which $(JLINKEXE))
+
+erase-all: 
+	$(PROGRAMMER) --jlinkexe $(JLINKEXE_PATH) erase
+
+
+program: 
+	$(PROGRAMMER) --jlinkexe $(JLINKEXE_PATH) flash $(PROJECT_NAME).bin $(FLASH_START_ADDRESS)
+
+
+

src/main.c

@@ -3,11 +3,13 @@
 
 
 int main(void){
-    nrf_gpio_range_cfg_output(18,19);
+    nrf_gpio_range_cfg_output(21,22);
     while(1){
-        nrf_gpio_port_write(2,8);
+        nrf_gpio_pin_write(21,0);
+        nrf_gpio_pin_write(22,1);
         nrf_delay_ms(80);
-        nrf_gpio_port_write(2,4);
+        nrf_gpio_pin_write(21,1);
+        nrf_gpio_pin_write(22,0);
         nrf_delay_ms(80);
     }