Tool/software:
Hi. I want to perform a test to check if the memory in MSP430FR5969 is working correctly.
I have a simple function that has a local array and two loops. The first loop assigns loop index to each element of the array. The second loop checks if each element of the array is equal to the loop index. I assume the array is allocated in stack section in RAM. When I change the size of the the local array, "Memory Allocation" panel in TI CCS still reports same RAM and stack usage, and reported FRAM and FRAM2 usage doesn't change either. If I change the size of the array to a value as large as the RAM size of the microcontroller, I receive no warning for this from TI CCS but the microcontroller resets every time the RAM test function is called. TI CCS generates an "array is too large" only if I change the size of the local array to a size larger than combined SRAM and FRAM size of the microcontroller. Why doesn't CCS generate this error reliably? What am I missing? How can I make sure that I don't run into allocation problems?
I looked into the linker file of the microcontroller for memory section addresses. In there, RAM origin is 0x1C00 and length is 0x0800. So assumably, first address of the RAM section is 0x1C00 and the last address is 0x23FF. When I debug the function described above, the local array has elements with addresses out of RAM range as expected. But I also noticed that the sections and their addresses are not continous, there are some unused addresses between memory sections. The memory is mapped as below in the table, starting from the lowest memory address to the highest, and I also included the memory map specification section from the linker file. I don't know how to read the linker file, therefore I want to ask if my interpretation is correct or wrong, if there are unmapped ranges in memory. If there are actually unmapped ranges, do they exist in the chip, even though they are not mapped? If they exist, what are they used for?
I also want to perform an instruction integrity check with a checksum algorithm or CRC module. How can I know at which address the instructions reside? Can I use the information in the .map file generated in the project folder? Or would you have a different recommendation?
Thanks.
| Start address | End address | |
| SFR | 0x0000 | 0x000F |
| PERIPHERALS_8BIT | 0x0010 | 0x00FF |
| PERIPHERALS_16BIT | 0x0100 | 0x01FF |
| unmapped range | 0x0200 | 0x17FF |
| INFOD | 0x1800 | 0x187F |
| INFOC | 0x1880 | 0x18FF |
| INFOB | 0x1900 | 0x197F |
| INFOA | 0x1980 | 0x19FF |
| unmapped range | 0x1A00 | 0x1BFF |
| RAM | 0x1C00 | 0x23FF |
| unmapped range | 0x2400 | 0x43FF |
| FRAM | 0x4400 | 0xFF7F |
| signatures and interrupt vectors | 0xFF80 | 0xFFFF |
| FRAM2 | 0x10000 | 0x13FF7 |
/****************************************************************************/
/* Specify the system memory map */
/****************************************************************************/
MEMORY
{
SFR : origin = 0x0000, length = 0x0010
PERIPHERALS_8BIT : origin = 0x0010, length = 0x00F0
PERIPHERALS_16BIT : origin = 0x0100, length = 0x0100
RAM : origin = 0x1C00, length = 0x0800
INFOA : origin = 0x1980, length = 0x0080
INFOB : origin = 0x1900, length = 0x0080
INFOC : origin = 0x1880, length = 0x0080
INFOD : origin = 0x1800, length = 0x0080
FRAM : origin = 0x4400, length = 0xBB80
FRAM2 : origin = 0x10000,length = 0x3FF8 /* Boundaries changed to fix CPU47 */
JTAGSIGNATURE : origin = 0xFF80, length = 0x0004, fill = 0xFFFF
BSLSIGNATURE : origin = 0xFF84, length = 0x0004, fill = 0xFFFF
IPESIGNATURE : origin = 0xFF88, length = 0x0008, fill = 0xFFFF
INT00 : origin = 0xFF90, length = 0x0002
INT01 : origin = 0xFF92, length = 0x0002
INT02 : origin = 0xFF94, length = 0x0002
INT03 : origin = 0xFF96, length = 0x0002
INT04 : origin = 0xFF98, length = 0x0002
INT05 : origin = 0xFF9A, length = 0x0002
INT06 : origin = 0xFF9C, length = 0x0002
INT07 : origin = 0xFF9E, length = 0x0002
INT08 : origin = 0xFFA0, length = 0x0002
INT09 : origin = 0xFFA2, length = 0x0002
INT10 : origin = 0xFFA4, length = 0x0002
INT11 : origin = 0xFFA6, length = 0x0002
INT12 : origin = 0xFFA8, length = 0x0002
INT13 : origin = 0xFFAA, length = 0x0002
INT14 : origin = 0xFFAC, length = 0x0002
INT15 : origin = 0xFFAE, length = 0x0002
INT16 : origin = 0xFFB0, length = 0x0002
INT17 : origin = 0xFFB2, length = 0x0002
INT18 : origin = 0xFFB4, length = 0x0002
INT19 : origin = 0xFFB6, length = 0x0002
INT20 : origin = 0xFFB8, length = 0x0002
INT21 : origin = 0xFFBA, length = 0x0002
INT22 : origin = 0xFFBC, length = 0x0002
INT23 : origin = 0xFFBE, length = 0x0002
INT24 : origin = 0xFFC0, length = 0x0002
INT25 : origin = 0xFFC2, length = 0x0002
INT26 : origin = 0xFFC4, length = 0x0002
INT27 : origin = 0xFFC6, length = 0x0002
INT28 : origin = 0xFFC8, length = 0x0002
INT29 : origin = 0xFFCA, length = 0x0002
INT30 : origin = 0xFFCC, length = 0x0002
INT31 : origin = 0xFFCE, length = 0x0002
INT32 : origin = 0xFFD0, length = 0x0002
INT33 : origin = 0xFFD2, length = 0x0002
INT34 : origin = 0xFFD4, length = 0x0002
INT35 : origin = 0xFFD6, length = 0x0002
INT36 : origin = 0xFFD8, length = 0x0002
INT37 : origin = 0xFFDA, length = 0x0002
INT38 : origin = 0xFFDC, length = 0x0002
INT39 : origin = 0xFFDE, length = 0x0002
INT40 : origin = 0xFFE0, length = 0x0002
INT41 : origin = 0xFFE2, length = 0x0002
INT42 : origin = 0xFFE4, length = 0x0002
INT43 : origin = 0xFFE6, length = 0x0002
INT44 : origin = 0xFFE8, length = 0x0002
INT45 : origin = 0xFFEA, length = 0x0002
INT46 : origin = 0xFFEC, length = 0x0002
INT47 : origin = 0xFFEE, length = 0x0002
INT48 : origin = 0xFFF0, length = 0x0002
INT49 : origin = 0xFFF2, length = 0x0002
INT50 : origin = 0xFFF4, length = 0x0002
INT51 : origin = 0xFFF6, length = 0x0002
INT52 : origin = 0xFFF8, length = 0x0002
INT53 : origin = 0xFFFA, length = 0x0002
INT54 : origin = 0xFFFC, length = 0x0002
RESET : origin = 0xFFFE, length = 0x0002
}
