Added support for Black Magic Probe (#787)

* Added flash-bmp and debug-bmp targets; added .gdb_history to .gitignore
* Added the BMP variable, defaults to /dev/ttyBmpGdb
The name of the BMP device is different on different systems. On Linux (after installing the recommended udev rules) it'll be /dev/ttyBmpGdb, but the user should be able to override it.
* Update rules.mk

.gitignore

@@ -13,6 +13,7 @@ latex
 .env
 .settings/
 .idea/
+.gdb_history
 /examples/*/*/build*
 test_old/
 tests_obsolete/

examples/make.mk

@@ -57,6 +57,7 @@ CROSS_COMPILE ?= arm-none-eabi-
 
 CC = $(CROSS_COMPILE)gcc
 CXX = $(CROSS_COMPILE)g++
+GDB = $(CROSS_COMPILE)gdb
 OBJCOPY = $(CROSS_COMPILE)objcopy
 SIZE = $(CROSS_COMPILE)size
 MKDIR = mkdir

examples/rules.mk

@@ -170,6 +170,16 @@ flash-pyocd: $(BUILD)/$(PROJECT).hex
 	pyocd flash -t $(PYOCD_TARGET) $<
 	pyocd reset -t $(PYOCD_TARGET)
 
+# flash with Black Magic Probe
+
+# This symlink is created by https://github.com/blacksphere/blackmagic/blob/master/driver/99-blackmagic.rules
+BMP ?= /dev/ttyBmpGdb
+
+flash-bmp: $(BUILD)/$(PROJECT).elf
+	$(GDB) --batch -ex 'target extended-remote $(BMP)' -ex 'monitor swdp_scan' -ex 'attach 1' -ex load  $<
+
+debug-bmp: $(BUILD)/$(PROJECT).elf
+	$(GDB) -ex 'target extended-remote $(BMP)' -ex 'monitor swdp_scan' -ex 'attach 1' $<
 
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