openocd: Add 'make ocd' target

Makefile

@@ -100,7 +100,10 @@ endif
 BAUD=115200
 DEV=/dev/ttyUSB0
 
-flash:
+ocd: gotek
+	python3 scripts/openocd/flash.py `pwd`/FF_Gotek-$(VER).hex
+
+flash: gotek
 	sudo stm32flash -b $(BAUD) -w FF_Gotek-$(VER).hex $(DEV)
 
 start:

scripts/openocd/f1.cfg

@@ -0,0 +1,8 @@
+
+source [find interface/stlink.cfg]
+
+transport select hla_swd
+
+source [find target/stm32f1x.cfg]
+
+reset_config srst_only connect_assert_srst

scripts/openocd/flash.py

@@ -0,0 +1,22 @@
+# flash.py <hex_filename>
+
+import os, sys, time, telnetlib
+
+cmd = 'reset init ; flash write_image erase %s ; reset\n' % sys.argv[1]
+
+# Start the OpenOCD daemon in the background and connect via telnet
+def open_ocd():
+    os.system('openocd -f scripts/openocd/f1.cfg &')
+    while True:
+        time.sleep(0.5)
+        try:
+            t = telnetlib.Telnet('localhost', 4444)
+        except:
+            pass
+        else:
+            return t
+
+with open_ocd() as t:
+    t.write(cmd.encode('utf-8'))
+    t.write('shutdown\n'.encode('utf-8'))
+    t.read_all() # Waits for EOF (telnet session shutdown)