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17 / 37 page  AN3307 Class B software package Doc ID 18186 Rev 4 17/37 4.2.2 Tool-specific integration of the library Startup file It is recommended to reuse the following compiler-specific files: ● startup_STM32fxxx.s file where regular reset handler should be replaced by STL_StartUp function address and checksum storage area should be defined (in case of MDK-ARM compiler) ● *.icf (for IAR) and *.sct (for KEIL) linker script files where all the memory regions including Class B specific ones are defined ● The workspace can also be used as an example (CRC generation is enabled in the linker/ processing tab of project options with IAR). ● Self-test startup routines do not alter or disable the compiler’s standard C startup files, variables and stack/heap which are initialized in the usual way. Defining new variables and memory sizes Double storage in CLASS_B_RAM and CLASS_B_RAM_REV is necessary to ensure the redundancy of the safety critical data (Class B). All other variables defined without any particular attributes are considered as Class A variables and are not checked during the transparent RAM test. Class A and Class B variable region sizes can be modified in the linker configuration file. New Class B variables must be declared in the stm32fxxx_STLclassBvar.h header file, with the following syntax for the IAR development environment: __no_init EXTERN uint32_t MyClassBvar @ "CLASS_B_RAM"; __no_init EXTERN uint32_t MyClassBvarInv @ "CLASS_B_RAM_REV"; and with the following syntax for the KEIL development environment: EXTERN uint32_t MyClassBvar __attribute__((section("CLASS_B_RAM"), zero_init)); EXTERN uint32_t MyClassBvarInv __attribute__((section("CLASS_B_RAM_REV"), zero_init)); Note: The start and end addresses of RAM/ROM regions are not exported when using the KEIL environment. These address modifications must be edited in the stm32fxxx_STLparam.h file, which contains addresses and constants required to do the RAM and ROM (Flash) tests. 4.2.3 Application demo example A short demo example of a user application is attached at main.c file related to the dedicated project (see Chapter 5: Class B solution structure). It provides an example of how the Class B routines can be integrated into an application-specific solution and demo software controlling hardware of dedicated evaluation board. The demo software uses the following hardware: ● On board LCD screen to display basic status messages ● Outputs to drive LEDs indicating that testing routines are executed properly. Dedicated LEDs are toggled once the partial RAM or FLASH test is completed and at every beginning and end of Class B testing procedures. These LED signals can be used to measure duration and frequency of the tests. Some of the LEDs indicate partial intervals of initial startup test, too. Please, follow the source code for more details. |
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