\section{Overview}
\paragraph{}
This guide details the use of STMicroelectronics STM32 discovery kits in
-an opensource environment.
+an open source environment.
\newpage
\section{Installing STLINK}
\paragraph{}
-STLINK is an opensource software to program and debug the discovery kits. Those
+STLINK is open source software to program and debug ST's STM32 Discovery kits. Those
kits have an onboard chip that translates USB commands sent by the host PC into
-JTAG commands. This chip is called STLINK, which is confusing since the software
-has the same name. It comes into 2 versions (STLINK v1 and v2). From a software
+JTAG/SWD commands. This chip is called STLINK, (yes, isn't that confusing? suggest a better
+name!) and comes in 2 versions (STLINK v1 and v2). From a software
point of view, those versions differ only in the transport layer used to communicate
-(v1 uses SCSI passthru commands, while v2 uses raw USB).
+(v1 uses SCSI passthru commands, while v2 uses raw USB). From a user point of view, they
+are identical.
\paragraph{}
-Before continuing, the following dependencies are required:
+Before continuing, the following dependencies must be met:
\begin{itemize}
\item libusb-1.0
-\item libsg2
+\item pkg-config
\end{itemize}
+\paragraph{}
+STLINK should run on any system meeting the above constraints.
+
\paragraph{}
The STLINK software source code is retrieved using:\\
\begin{small}
\begin{lstlisting}[frame=tb]
-git clone https://github.com/texane/stlink stlink.git
+$> git clone https://github.com/texane/stlink stlink.git
\end{lstlisting}
\end{small}
\paragraph{}
-The GDB server is called st-util and is built using:\\
+Everything can be built from the top directory:\\
\begin{small}
\begin{lstlisting}[frame=tb]
-$> cd stlink.git;
-$> make ;
-$> cd gdbserver ;
-$> make ;
+$> cd stlink.git
+$> make
\end{lstlisting}
\end{small}
+It includes:
+\begin{itemize}
+\item a communication library (stlink.git/libstlink.a),
+\item a GDB server (stlink.git/gdbserver/st-util),
+\item a flash manipulation tool (stlink.git/flash/flash).
+\end{itemize}
\newpage
-
-\section{Building and running a program}
+\section{Building and running a program in SRAM}
+\paragraph{}
A simple LED blinking example is provided in the example directory. It is built using:\\
\begin{small}
\begin{lstlisting}[frame=tb]
cd stlink.git/example/blink ;
-PATH=$TOOLCHAIN_PATH/bin:$PATH make ;
+PATH=$TOOLCHAIN_PATH/bin:$PATH make
\end{lstlisting}
\end{small}
+This builds three files, one for each of the Discovery boards currently
+available, linked to run from SRAM. (So no risk of overwriting anything you didn't mean to)
+These blink examples can safely be used to verify that:
+
+\begin{itemize}
+\item Your installed toolchain is capable of compiling for cortex M3/M4 targets
+\item stlink is functional
+\item Your arm-none-eabi-gdb is functional
+\item Your board is functional
+\end{itemize}
\paragraph{}
-A GDB server must be start to interact with the STM32. Depending on the discovery kit you
+A GDB server must be started to interact with the STM32. Depending on the discovery kit you
are using, you must run one of the 2 commands:\\
\begin{small}
\begin{lstlisting}[frame=tb]
-# STM32VL discovery kit
-$> sudo ./st-util /dev/sg2
+# STM32VL discovery kit (onboard ST-link)
+$> ./st-util --stlinkv1
+
+# STM32L or STM32F4 discovery kit (onboard ST-link/V2)
+$> ./st-util
-# STM32L discovery kit
-$> sudo ./st-util
+# Full help for other options (listen port, version)
+$> ./st-util --help
\end{lstlisting}
\end{small}
memory map, GDB knows this address belongs to SRAM. To load the program in SRAM, simply use:\\
\begin{small}
\begin{lstlisting}[frame=tb]
-$> load blink.elf
+$> # Choose one as appropriate for your Discovery kit
+$> load blink_32L.elf | load blink_32VL.elf | load blink_F4.elf
\end{lstlisting}
\end{small}
\end{small}
\paragraph{}
-The board BLUE and GREEN leds should be blinking (those leds are near the user and reset buttons).
+All the LEDs on the board should now be blinking in time (those leds are near the user and reset buttons).
+
+\newpage
+\section{Building and flashing a program}
+\paragraph{}
+FLASH memory reading and writing is done by a separate tool, as shown below:\\
+\begin{small}
+\begin{lstlisting}[frame=tb]
+# change to the flash tool directory
+$> cd stlink.git/flash ;
+
+# stlinkv1 command to read 4096 from flash into out.bin
+$> ./flash read v1 out.bin 0x8000000 4096
+# stlinkv2 command
+$> ./flash read out.bin 0x8000000 4096
+
+# stlinkv1 command to write the file in.bin into flash
+$> ./flash write v1 in.bin 0x8000000
+
+# stlinkv2 command
+$> ./flash write in.bin 0x8000000
+\end{lstlisting}
+\end{small}
+
+\paragraph{}
+A LED blinking example is provided:\\
+\begin{small}
+\begin{lstlisting}[frame=tb]
+# build the example, resulting in blink.bin
+$> cd stlink.git/example/blink_flash
+$> PATH=$TOOLCHAIN_PATH:$PATH make CONFIG_STM32L_DISCOVERY=1
+
+# write blink.bin into FLASH
+$> sudo ./flash write blink.bin 0x08000000
+\end{lstlisting}
+\end{small}
+
+\paragraph{}
+Upon reset, the board LEDs should be blinking.
+
+\newpage
+\section{Building and installing the CHIBIOS kernel}
+\paragraph{}
+CHIBIOS is an open source RTOS. More information can be found on the project website:
+\begin{center}
+http://www.chibios.org/dokuwiki/doku.php
+\end{center}
+
+\paragraph{}
+It supports several boards, including the STM32L DISCOVERY kit:
+\begin{center}
+http://www.chibios.org/dokuwiki/doku.php?id=chibios:articles:stm32l\_discovery
+\end{center}
+
+\paragraph{}
+The installation procedure is detailed below:\\
+\begin{small}
+\begin{lstlisting}[frame=tb]
+# checkout and build CHIBIOS for STM32L DISCOVERY kits
+svn checkout https://chibios.svn.sourceforge.net/svnroot/chibios/trunk
+cd chibios/trunk/demos/ARMCM3-STM32L152-DISCOVERY
+PATH=$TOOLCHAIN_PATH:$PATH make
+
+# flash the image into STM32L
+sudo ./flash write build/ch.bin 0x08000000
+\end{lstlisting}
+\end{small}
\newpage
\section{Notes}
+
+\subsection{Disassembling THUMB code in GDB}
\paragraph{}
By default, the disassemble command in GDB operates in ARM mode. The programs running on CORTEX-M3
are compiled in THUMB mode. To correctly disassemble them under GDB, uses an odd address. For instance,
\end{small}
+\subsection{libstm32l\_discovery}
+\paragraph{}
+The repository includes the STM32L discovery library source code from ST original firmware packages,
+available here:\\
+\begin{small}
+\begin{lstlisting}[frame=tb]
+http://www.st.com/internet/evalboard/product/250990.jsp#FIRMWARE
+\end{lstlisting}
+\end{small}
+
+\paragraph{}
+It is built using:\\
+\begin{small}
+\begin{lstlisting}[frame=tb]
+$> cd stlink.git/example/libstm32l_discovery/build
+$> make
+\end{lstlisting}
+\end{small}
+
+\paragraph{}
+An example using the library can be built using:\\
+\begin{small}
+\begin{lstlisting}[frame=tb]
+$> cd stlink.git/example/lcd
+$> make
+\end{lstlisting}
+\end{small}
+
+
\newpage
\section{References}
\begin{itemize}
projects / fw / stlink / blobdiff