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@@ -14,3 +14,152 @@ Besides being functioning as a JTAG/SWD debug probe, IBDAP could also be used as
 
 ![IBDAP pinmap](https://s3.amazonaws.com/armstart/Debug+Tools/IBDAP-LPC11U35/7.jpg)
  
+ 
+# OpenOCD Tutorial
+ 
+## install deps
+
+sudo apt-get install build-essential
+
+sudo apt-get install autotools-dev autoconf automake libtool
+
+sudo apt-get install texinfo libudev-dev libusb-1.0-0-dev libfox-1.6-dev
+
+
+## Download FTDI driver
+
+```
+http://www.intra2net.com/en/developer/libftdi/download.php
+tar xf libftdi1-1.2.tar.bz2
+```
+
+## HIDAPI 
+
+```
+git clone git://github.com/signal11/hidapi.git
+./bootstrap
+./configure
+make
+sudo make install
+```
+
+## Build and Install OpenOCD
+
+```
+git clone git://git.code.sf.net/p/openocd/code
+cd code
+./bootstrap
+cd ../
+mkdir ./openocd-build
+cd openocd-build
+../code/configure --with-ftd2xx-linux-tardir=../libftdi1-1.2 --prefix=/opt/openocd --enable-jlink --enable-ftdi --enable-stlink --enable-ti-icdi --enable-ulink --enable-usb-blaster-2 --enable-cmsis-dap --enable-bcm2835gpio
+make
+make install
+```
+## Usage
+
+### Prepare extra OpenOCD cfg commands
+
+create file openocd.cfg with following contents:
+
+```
+$_TARGETNAME configure -event gdb-attach {
+   echo "Halting target"
+   halt
+}
+```
+
+### Start OpenOCD server to Debug LPC11U35
+
+```
+sudo openocd -f interface/jlink.cfg -c "transport select swd" -f target/lpc11xx.cfg -f openocd.cfg 
+
+```
+
+### Flash and Debug
+
+- First, flash debug firmware on board
+
+```
+telnet localhost 4444
+reset halt
+flash probe 0
+flash write_image erase /home/yliu/projects/ib51822/IBDAP-FW/Firmware/IBDAP/Debug/IBDAP.bin 0x0
+reset
+exit
+```
+
+- Second, debug using the commands:
+
+```
+target remote localhost:3333
+break IBDAP.c:103
+monitor reset halt
+monitor reset init
+continue
+```
+http://wiki.paparazziuav.org/wiki/DevGuide/GDB_OpenOCD_Debug
+
+### Breakpoint limits
+
+```
+set remote hardware-breakpoint-limit 4
+set remote hardware-watchpoint-limit 2
+```
+
+### gdbtui GUI debugging
+
+http://fun-tech.se/stm32/OpenOCD/gdb.php
+
+
+## OpenOCD nRF51822 using IBDAP
+
+Launch OpenOCD
+
+```
+$ sudo openocd -f interface/cmsis-dap.cfg -c "transport select swd" -f target/nrf51.cfg
+```
+
+nrf OpenOCD log
+
+```
+yliu@yliu-xbtu:~$ 
+yliu@yliu-xbtu:~$ sudo openocd -f interface/cmsis-dap.cfg -c "transport select swd" -f target/nrf51.cfg
+[sudo] password for yliu: 
+Open On-Chip Debugger 0.10.0-dev-00001-g70a14db (2015-06-23-16:35)
+Licensed under GNU GPL v2
+For bug reports, read
+       http://openocd.org/doc/doxygen/bugs.html
+Info : only one transport option; autoselect 'swd'
+Warn : Transport "swd" was already selected
+swd
+cortex_m reset_config sysresetreq
+adapter speed: 1000 kHz
+Info : CMSIS-DAP: SWD  Supported
+Info : CMSIS-DAP: JTAG Supported
+Info : CMSIS-DAP: Interface Initialised (SWD)
+Info : CMSIS-DAP: FW Version = 1.0
+Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 1 TDO = 1 nTRST = 0 nRESET = 1
+Info : CMSIS-DAP: Interface ready
+Info : clock speed 1000 kHz
+Info : SWD IDCODE 0x0bb11477
+Info : nrf51.cpu: hardware has 4 breakpoints, 2 watchpoints
+Info : accepting 'telnet' connection on tcp/4444
+```
+
+
+```
+yliu@yliu-xbtu:~$ telnet localhost 4444
+Trying 127.0.0.1...
+Connected to localhost.
+Escape character is '^]'.
+Open On-Chip Debugger
+> reset halt
+target state: halted
+target halted due to debug-request, current mode: Thread 
+xPSR: 0xc1000000 pc: 0x000006d0 msp: 0x000007c0
+> flash probe 0
+Unknown device (HWID 0x00000057)
+flash 'nrf51' found at 0x00000000
+```
+