AN3307 datasheet(19/37 Pages) STMICROELECTRONICS

19 / 37 page

AN3307

Class B software package

Doc ID 18186 Rev 4

19/37

CRC generation is not supported in the KEIL environment; so calling CRC checking routines

without proper setting of CHECKSUM area at startup file will cause the application to reset

continuously (as if a failure was detected).

Examples:

To disable CRC check at startup, modify the output logic control used to evaluate the

test result (assuming the computed CRC is different from REF_CRC16):

In the stm32fxxx_STLstartup.c file modify:

if(STL_crc16(CRC_INIT,(u8 *)ROM_START, ROM_SIZE) != REF_CRC16)

into:

if(STL_crc16(CRC_INIT,(u8 *)ROM_START, ROM_SIZE) == REF_CRC16)

To replace 16-CRC by 32-bit internal CRC computation, modify stm32fxxx_STLmain.c

file:

RomTest = STL_crc16Run();

RomTest = STL_crc32Run();

Then comment the following #defines in file stm32f10x_STLparam.h starting from line

129:

#define DELTA_MAIN ....

#define LAST_DELTA_MAIN ....

#define FULL_FLASH_CHECKED ...

and uncomment the corresponding #defines for 32-bit CRC computation. In this case

only the CRC32 algorithm control flow will be checked correctly.

4.3.2

Verbose diagnostic mode

The dedicated USART Tx serial peripheral line is used in verbose mode as a standard

output for Class B status text messages. This mode is useful in the debug phase when the

line can be monitored by an external terminal (the line setting is 115200 Bd, no parity, 8-bit

data, 1 stop bit). Verbose mode is enabled by default and can be disabled during startup

and/or runtime by commenting lines with the STL_VERBOSE_POR and STL_VERBOSE

defined in the Class B configuration file stm32x_stl_param.h. Each successful finishing of

SRAM and Flash test at run time is signalled by printing a specific character '#' or '*' at

terminal window. The verbose messages can differ slightly between packages. Figure 4

shows an example of verbose mode.

AN3307 Datasheet(PDF) 19 Page - STMicroelectronics