AN2361 Application note
Interfacing with the STR91x software library using Configuration and Programming Software (CAPS)
I ntrod uction
STR91x microcontrollers offer extremely flexible configuration of I/O routing and clock structures to optimize the use of each I/O pin and provide fine control of system clocks. The contents of a number of STR91x control registers are initialized by firmware at runtime to configure the I/O switch matrix on I/O Ports 0 through 9, and to set the initial values of system clock divisors. STMicroelectronics provides the Configuration and Programming Software (CAPS) utility to graphically assist users in the selection of pin functions and clock divisors, and to generate a C header file with all the correct settings to integrate into the STR91x standard software library. CAPS makes it very easy to visualize the optimum mapping of communication interfaces on the I/O pins, reduces the chance of error and reduces the need to study the datasheet definitions of these control registers in detail. CAPS is also an in-system programming tool that, via an external JTAG adapter, allows fast programming of STR9 in both development and production environments. Although this application note does not explore this topic, it describes the fundamental steps needed to interface with the STR91x Standard Library (STR91x StdLib). For more details about CAPS software functionality, please refer to UM0225 - CAPS User Manual. The first part of this document focuses on how to use CAPS with the STR91x StdLib. The second part provides an example of how to change the clock frequencies and the GPIO pin configurations. The source file, 91x_caps.c, which allows the interface between CAPS and the STR91x StdLib is provided with this application note.
Glossary
This section gives a brief definition of acronyms and abbreviations used in this document:
CAPS_project directory: refers to CAPS project directory. By default it is located at: [CAPS Install directory\CAPS\Projects]
PPP or ppp: in the notation for file names, is used as a placeholder to stand for any peripheral acronym, such as ADC, CAN, DMA, etc.
StdLib_project directory: is the project directory in the STR91x StdLib package user_project directory: refers to user project directory
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Related documents
The following topic related documents are available at www.st.com/mcu:
UM0225 - CAPS User Manual for STR9 UM0216 - STR91xF Reference Manual
This is only a select list of supporting documents. Refer to www.st.com/mcu for a complete list of STR91xF application notes.
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Contents
Contents
1 Interfacing CAPS with the STR91x StdLib . . . . . . . . . . . . . . . . . . . . . . . 4
1. 1 1.2 STR91x StdLib . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Using the STR91x StdLib with CAPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.1 1.2.2 Source file definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 General procedure for Interfacing with the STR91x StdLib . . . . . . . . . . . 6
2
Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2. 1 2. 2 Clock setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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Interfacing CAPS with the STR91x StdLib
This section provides an overview of the tools you will need and the procedure for interfacing CAPS with the STR91xStdLib. Complete installation and user instructions for all software are found in their respective user manuals. All software, files and documentation are available for free download at www.st.com/mcu. You will need to have downloaded and installed the following:
STR91x StdLib of the STR91x Standard Software Library CAPS - Configuration and Programming Software (version 2.0 or later) 91x_caps.c provided with this application note. For installation, see Section 1.2.
1.1
STR91x StdLib
The STR91x software library software package is composed of three different libraries: 1. 2. 3. STR91x StdLib consisting of device drivers for all standard STR91x peripherals STR91x USB library consisting of USB driver and sample application STR91x Ethernet library consisting of Ethernet driver and sample application
This application note deals only with the STR91x StdLib. To clearly understand the use of CAPS with the STR91x StdLib, it is important to understand the library architecture. The STR91x StdLib contains the subdirectories shown in Figure 1. Figure 1. StdLib directory structure
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Interfacing CAPS with the STR91x StdLib The example directory has a sub-directory for each peripheral containing the minimum set of files needed to run a typical example on how to use the peripheral. These files are:
Readme.txt: a brief text file describing the example and how to make it work 91x_conf.h: the header file to configure the used peripherals and miscellaneous defines 91x_it.c: the source file containing the interrupt handlers (the function bodies may be empty if not used) main.c: the sample program
All examples are independent of any software toolchain.
Note:
In the notation for file names, "ppp" is used as a placeholder for any peripheral acronym, such as ADC, CAN, DMA, etc.
The Library directory contains all the subdirectories and files that form the core of the library:
inc sub-directory contains the software library header files that do not need to be modified by the user: 91x_type.h: contains the common data types and enumeration used in all other files 91x_map.h: contains the peripheral memory mapping and register data structures 91x_lib.h: is the main header file including all other headers 91x_ppp.h (one header file per peripheral): contains the function prototypes, data structures and enumeration
src sub-directory contains the software library source files that do not need to be modified by the user: 91x_ppp.c (one source file per peripheral): contains the function bodies of each peripheral.
All library files are coded in Strict ANSI-C and are independent from any software toolchain The project directory contains a standard template project program for each supported software toolchain, which compiles all library files and also all the user modifiable files needed to create a new project:
91x_conf.h: the configuration header file with all peripherals defined by default 91x_it.c: the source file containing the interrupt handlers (the function bodies are empty in this template) main.c: the main program body
For more details, please refer to UM0233 -Standard Library User Manual
1.2
1.2.1
Using the STR91x StdLib with CAPS
Source file definitions
This section introduces the source files that are referred to in the procedure in Section 1.2.2 on page 6.
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Interfacing CAPS with the STR91x StdLib CAPS interfaces with the STR91x StdLib using the 91x_caps.c source file and the header file generated by CAPS containing the entries specified by the user. The 91x_caps.c source file is provided with this application note. The following table describes these files.
File
Description
CAPS generates a C header file with all the correct settings to integrate into C header file the STR91x standard library. By default, the filename is that of the CAPS generated by CAPS project. For efficiency, this filename name should be changed to 91x_conf.h. The 91x_caps.c is a configuration file. It should be included in the StdLib\library\src subdirectory to be linked with the application source files. It describes: 1. The clock settings: clock sources and dividers (AHB, APB, EMI, FMI) 2. The GPIO matrix configuration 3. EMI wait state configuration 4. The clocks enabled for the peripherals used in the application
91x_caps.c
1.2.2
General procedure for Interfacing with the STR91x StdLib
1. 2. Add the 91x_caps.c source file to the StdLib\library\src subdirectory to be linked with the final project, as shown in Figure 2, step 1. Run the CAPS utility and choose/change the clock and/or the GPIO settings and assignment. In the Select folder and file field choose the user_project directory and name the C header file to 91x_conf.h, as shown in Figure 2, step 2 (For a detailed example, refer to Section 2). Add "Device_Init()" function, defined in 91x_caps.c, in the main.c source file at the beginning of the main function, as shown in Figure 2, step 3. Include all C source files in the StdLib_project\library\src subdirectory and C header files in the StdLib_project\library\inc subdirectory to your project.
3. 4.
Note:
Including all C source and header files to the user application reduces the risk of error. Nevertheless, for optimization reasons, at least the following source and header files should be compiled: * 91x_emi.c & 9 1x_emi.h * 91x_fmi.c & 9 1x_fmi.h * 91x_gpio.c & 9 1x_gpio.h * 91x_dma.c & 9 1x_dma.h. * 91x_scu.c & 9 1x_scu.h.
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Figure 2.
General procedure for interfacing with the STR91x StdLib STEP 1 Add 91x_caps.c to the src subdirectory
StdLib\library\src subdirectory
ppp.c source file ppp.h header file
STEP 2 Run CAPS to generate a C header file with all the correct settings for integration into the STR91x standard library
CAPS tool
main.c 91x_it.c
user_project directory
STEP 3 Add Device_Init (); at the beginning of the main function of the main.c source file
STEP 4
Rebuild and Run the application
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Example
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Example
This section provides a step-by-step example of how to use CAPS to select pin functions and clock divisors, and to generate a C header file with all the correct settings to integrate into the STR91x standard software library. To run CAPS tool:
Select Start>Programs>STMicroelectronics-CAPS>CAPS.
CAPS starts and the following window appears: Figure 3. CAPS project window
By default the Project folder is [CAPS Install directory]\projects\new and the defaultproject name is new. To create new project:
Use the Browse button to select a working directory, this opens a dialog box that asks you for the new project file name (see Figure 4). Enter project _name as the project space name in the File name field.
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Figure 4.
Specifying the project folder and name
Click on the Open button to validate your entries.
The Target Device for Target window allows you to select the microcontroller that you will use in your application. This window shows the CAPS device database for the STR9 and PSD families.
Select the STR9 MCU you plan to use. In this example, the STR912FW44 microcontroller is used. Click to expand the STR912FW44 device and choose the package. The device overview will appear in the right panel (see Figure 5). Specifying the target device
Figure 5.
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Click on Create to confirm your entry. The following dialog appears: LVD Voltage window
Figure 6.
This dialog contains several tabs for specifying the desired configurations. Only the use of the Clocks tab and the Peripheral/Pin Assignment tab are described in this example.
2.1
Clock setting
In the Clocks tab, you can specify clock settings in two steps. The first step allows the specification of the clock source, the master clock frequency, the OSC frequency and the PLL value with just a few simple and point-and-click operations (see Figure 7).
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Figure 7.
Clock source Master clock frequency
The second part shows the clock control diagram and lets users choose the clock divider that is used to obtain the desired frequency from the selection lists. Figure 8. Clock divisors
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2.2
Pin assignments
On the Peripheral/Pin Assignment tab, you need to: 1. 2. Specify peripherals fin the List of available peripheral(s) pane for GPIO assignment. Specify the folder and file name in order to save the entries to a C header file. Peripheral / Pin assignment tab
Figure 9.
In this example, configuration of the Timer 0 (TIM0) and I2C0 peripherals is described.
To configure Timer 0 (TIM0)
Select the Timer 0 (TIM0) item from the List of the available peripheral(s) pane. Click on the Assign button. The Peripheral Assignment-Timer window appears automatically, allowing you to select the desired timer/counter clock and mode. In this example, the internal timer clock is chosen as timer clock and the input capture A is the selected mode. (see Figure 10).
Figure 10. Peripheral assignment window
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Click on the Pin Assignment button. The Pin Assignment-Timer0 window appears automatically allowing you to assign the desired pin to its respective function. In this example, the port 0 pin 4 (P0_4) is used (see Figure 11).
Figure 11. Pin Assignment - Timer0 window
Click on Apply to confirm your entry.
The TIM0 is automatically added to the List of assigned peripheral(s) pane.
To configure I2C0
Select the I2C0 peripheral from the List of the available peripheral(s) pane Click on the Assign button. The following window appears:
Figure 12. Prompt window
Click on Yes to confirm. The Pin Assignment-I2C0 dialog box in Figure 13 appears:
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Figure 13. Pin Assignment I2C0 window
The Pin Assignment-I2C0 window allows you to assign the desired pin to its respective function. In this example, the port 0 pin 0 (p0_0) is used for clock in and port 0-pin1 (p0_1) is used for the data out.
Click on Apply to confirm your entry.
The I2C0 is automatically added to the List of assigned peripheral(s) pane.
Save entries to a C header file
To save the entries in this session to a C header file, you have to specify the folder and file name.
Click on the Save button in the Peripheral/Pin Assignment tab. This opens a Save As window that allows you to specify the C header file name and directory. Choose the user_project directory and enter 91x_conf.h in the File name field.
Figure 14. Save As window
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Click on Save to confirm your entry.
A message indicating that the save was successful appears in the Output window. Now that you have output the header file from CAPS, follow the remaining two steps described in Section 1.2.2 and run your application successfully.
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Revision history
3
Revision history
Date 21-June-2006 Revision 1 Initial release. Changes
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