Hi,
I have a functioning project that fully compiles with only three warnings, but when I debug it and examine C structures in the live expressions viewer the the data (GovTrimControl_P structure ) appears to be offset by 4 bytes, yet the memory browser shows the correct values and when the mouse hovers over a value that value is correct:
The Build Analyser also reports the address of GovTrimControl_P correctly
Compile Problem Output:
The values for the GovTrimControl_P structure are set at bootup to:
/* Parameters (default storage) */
struct P_GovTrimControl_T_
{
real32_T FreqSP; /* Variable: FreqSP */
real32_T kD; /* Variable: kD */
real32_T kI; /* Variable: kI */
real32_T kN; /* Variable: kN */
real32_T kP; /* Variable: kP */
};
typedef struct P_GovTrimControl_T_ P_GovTrimControl_T;
/* Block parameters (default storage) */
P_GovTrimControl_T GovTrimControl_P =
{
/* Variable: FreqSP */
50.0F,
/* Variable: kD */
2.0F,
/* Variable: kI */
20.0F,
/* Variable: kN */
2.0F,
/* Variable: kP */
30.0F
};
The problem also occurs with another constant array where the Live Expression viewer reports incorrect framing of the underlying data.
I am running STM32CubeIDE Version
Version: 1.16.1
Build: 22882_20240916_0822 (UTC)
On an STM32H750B-DK Discovery kit,
I have attached the Linker Script File, startup file and video in the hope this might shed some light on the issue. The video shows the Backup ram memory which has the GovTrimControl_P data copied into it. The data shows the correct framing in the browser, but not in the Live Expression viewer:
The backup ram copy function and its use are shown below:
void backupRamStartup(uint16_t bypassBtnState,
uint32_t code, uint32_t* ramCode,
void* ramAddr,
void* parameters,
uint16_t size)
{
if((bypassBtnState == 1) || (*ramCode != code))
{
/* The user is setting the defaults or the backupRam is empty */
*ramCode = code;
memcpy(ramAddr, parameters, size);
return;
}
/* The backup ram contents are used to set the parameters*/
memcpy(¶meters, &ramAddr, size);
}
/* Useage */
backupRamStartup( HAL_GPIO_ReadPin(PC13_PB_DEFAULT_SET_GPIO_Port,
PC13_PB_DEFAULT_SET_Pin),
0xC0AD1234,
&backupRAMValidationCode,
&backupRam,
&GovTrimControl_P,
sizeof(GovTrimControl_P));
I have never seen this occur in any of my other similar projects with older versions of the IDE.
Has anyone else seen this problem
Kind Regards
Rob
/* LINKER SCRIPT */
/* Entry Point */
ENTRY(Reset_Handler)
/* Highest address of the user mode stack */
_estack = ORIGIN(RAM_D1) + LENGTH(RAM_D1); /* end of "RAM_D1" Ram type memory */
_Min_Heap_Size = 0x1000; /* required amount of heap */
_Min_Stack_Size = 0x1000; /* required amount of stack */
/* Memories definition */
MEMORY
{
DTCM_STACK (xrw) : ORIGIN = 0x20000000, LENGTH = _Min_Heap_Size + _Min_Stack_Size
DTCM_MISC (xrw) : ORIGIN = 0x20002000, LENGTH = 120K
ITCMRAM (xrw) : ORIGIN = 0x00000000, LENGTH = 64K
RAM_D1 (xrw) : ORIGIN = 0x24000000, LENGTH = 512K
RAM_D2 (xrw) : ORIGIN = 0x30000000, LENGTH = 288K
RAM_D3 (xrw) : ORIGIN = 0x38000000, LENGTH = 64K
SDRAM_FB (xrw) : ORIGIN = 0xD0000000, LENGTH = 765K
SDRAM_USER (xrw) : ORIGIN = 0xD0000000 + 765K, LENGTH = 8M - 765K
FLASH (xr) : ORIGIN = 0x90000000, LENGTH = 2048K
ASSETS_FLASH (r) : ORIGIN = 0x90200000, LENGTH = 126M
BOOTLOADER (xrw) : ORIGIN = 0x08000000, LENGTH = 128k
VBAT_SRAM_CODE (xrw) : ORIGIN = 0x38800000, LENGTH = 4
VBAT_SRAM (xrw) : ORIGIN = 0x38800000 + 4, LENGTH = 4K - 4
}
TARGET(binary) /* specify the file format of binary file */
INPUT (../../ExtMem_Boot/bootloader.bin) /* bootloader bin file path (relative to the output folder)*/
OUTPUT_FORMAT(default) /* restore the out file format */
/* Sections */
SECTIONS
{
.bootloader :
{
. = ALIGN(4);
KEEP(../../ExtMem_Boot/bootloader.bin)
} > BOOTLOADER
/* The startup code into "FLASH" Rom type memory */
.isr_vector :
{
__ICFEDIT_intvec_start__ = .;
. = ALIGN(4);
KEEP(*(.isr_vector)) /* Startup code */
. = ALIGN(4);
} >FLASH
/* The program code and other data into "FLASH" Rom type memory */
.text :
{
. = ALIGN(4);
*(.text) /* .text sections (code) */
*(.text*) /* .text* sections (code) */
*(.glue_7) /* glue arm to thumb code */
*(.glue_7t) /* glue thumb to arm code */
*(.eh_frame)
KEEP (*(.init))
KEEP (*(.fini))
. = ALIGN(4);
_etext = .; /* define a global symbols at end of code */
} >FLASH
/* Constant data into "FLASH" Rom type memory */
.rodata :
{
. = ALIGN(4);
*(.rodata) /* .rodata sections (constants, strings, etc.) */
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
. = ALIGN(4);
} >FLASH
.ARM.extab (READONLY) : {
. = ALIGN(4);
*(.ARM.extab* .gnu.linkonce.armextab.*)
. = ALIGN(4);
} >FLASH
.ARM (READONLY) : {
. = ALIGN(4);
__exidx_start = .;
*(.ARM.exidx*)
__exidx_end = .;
. = ALIGN(4);
} >FLASH
.preinit_array (READONLY) :
{
. = ALIGN(4);
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array*))
PROVIDE_HIDDEN (__preinit_array_end = .);
. = ALIGN(4);
} >FLASH
.init_array (READONLY) :
{
. = ALIGN(4);
PROVIDE_HIDDEN (__init_array_start = .);
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array*))
PROVIDE_HIDDEN (__init_array_end = .);
. = ALIGN(4);
} >FLASH
.fini_array (READONLY) :
{
. = ALIGN(4);
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP (*(SORT(.fini_array.*)))
KEEP (*(.fini_array*))
PROVIDE_HIDDEN (__fini_array_end = .);
. = ALIGN(4);
} >FLASH
/* Used by the startup to initialize data */
_sidata = LOADADDR(.data);
/* Initialized data sections into "RAM_D1" Ram type memory */
.data :
{
. = ALIGN(4);
_sdata = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
. = ALIGN(4);
_edata = .; /* define a global symbol at data end */
} >RAM_D1 AT> FLASH
/* Uninitialized data section into "RAM_D1" Ram type memory */
. = ALIGN(4);
.bss :
{
/* This is used by the startup in order to initialize the .bss section */
_sbss = .; /* define a global symbol at bss start */
__bss_start__ = _sbss;
*(.bss)
*(.bss*)
*(COMMON)
. = ALIGN(4);
_ebss = .; /* define a global symbol at bss end */
__bss_end__ = _ebss;
} >RAM_D1
/* User_heap_stack section, used to check that there is enough "RAM_D1" Ram type memory left */
._user_heap_stack :
{
. = ALIGN(8);
PROVIDE ( end = . );
PROVIDE ( _end = . );
. = . + _Min_Heap_Size;
. = . + _Min_Stack_Size;
. = ALIGN(8);
} >DTCM_STACK
.DTCM_MISC : {
. = ALIGN(4);
_sDTCM_MISC = .;
__sDTCM_MISC__ = _sDTCM_MISC;
*(.DTCM_MISC) /* All nominated variables */
. = ALIGN(4);
_eDTCM_MISC = .;
__eDTCM_MISC__ = _eDTCM_MISC;
} >DTCM_MISC
.VBAT_SRAM_CODE (NOLOAD) : {
. = ALIGN(4);
_sVBAT_SRAM_CODE = .;
__sVBAT_SRAM_CODE__ = _sVBAT_SRAM_CODE;
*(.VBAT_SRAM_CODE) /* All nominated variables */
. = ALIGN(4);
_eVBAT_SRAM_CODE = .;
__eVBAT_SRAM_CODE__ = _eVBAT_SRAM_CODE;
} >VBAT_SRAM_CODE
.VBAT_SRAM (NOLOAD) : {
. = ALIGN(4);
_sVBAT_SRAM = .;
__sVBAT_SRAM__ = _sVBAT_SRAM;
*(.VBAT_SRAM) /* All nominated variables */
. = ALIGN(4);
_eVBAT_SRAM = .;
__eVBAT_SRAM__ = _eVBAT_SRAM;
} >VBAT_SRAM
/* Remove information from the compiler libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}
.ARM.attributes 0 : { *(.ARM.attributes) }
FontFlashSection :
{
*(FontFlashSection FontFlashSection.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x4);
} >ASSETS_FLASH
TextFlashSection :
{
*(TextFlashSection TextFlashSection.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x4);
} >ASSETS_FLASH
ExtFlashSection :
{
*(ExtFlashSection ExtFlashSection.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x4);
} >ASSETS_FLASH
BmpCacheSection (NOLOAD) : { *(BmpCacheSection) } >SDRAM_FB
TouchGFX_Framebuffer (NOLOAD) : { *(TouchGFX_Framebuffer) } >SDRAM_FB
TouchGFX_Framebuffer1 (NOLOAD) : { *(TouchGFX_Framebuffer1) } >SDRAM_FB
TouchGFX_Framebuffer2 (NOLOAD) : { *(TouchGFX_Framebuffer2) } >SDRAM_FB
Video_RGB_Buffer (NOLOAD) : { *(Video_RGB_Buffer) } >SDRAM_FB
}
/* Start-up code */
.syntax unified
.cpu cortex-m7
.fpu softvfp
.thumb
.global g_pfnVectors
.global Default_Handler
/* start address for the initialization values of the .data section.
defined in linker script */
.word _sidata
/* start address for the .data section. defined in linker script */
.word _sdata
/* end address for the .data section. defined in linker script */
.word _edata
/* start address for the .bss section. defined in linker script */
.word _sbss
/* end address for the .bss section. defined in linker script */
.word _ebss
/* stack used for SystemInit_ExtMemCtl; always internal RAM used */
/**
* @brief This is the code that gets called when the processor first
* starts execution following a reset event. Only the absolutely
* necessary set is performed, after which the application
* supplied main() routine is called.
* None
* @retval : None
*/
.section .text.Reset_Handler
.weak Reset_Handler
.type Reset_Handler, %function
Reset_Handler:
ldr sp, =_estack /* set stack pointer */
/* Copy the data segment initializers from flash to SRAM */
movs r1, #0
b LoopCopyDataInit
CopyDataInit:
ldr r3, =_sidata
ldr r3, [r3, r1]
str r3, [r0, r1]
adds r1, r1, #4
LoopCopyDataInit:
ldr r0, =_sdata
ldr r3, =_edata
adds r2, r0, r1
cmp r2, r3
bcc CopyDataInit
ldr r2, =_sbss
b LoopFillZerobss
/* Zero fill the bss segment. */
FillZerobss:
movs r3, #0
str r3, [r2], #4
LoopFillZerobss:
ldr r3, = _ebss
cmp r2, r3
bcc FillZerobss
I tried your data structure on a Nucleo-G431KB and didn't see any issues after several debugging tries. The Live Expression looked good.
I then grabbed a STM32H750B-DK and copied over the code from the G431.
On the first debug, the FreqSP showed 30. Somewhat similar to what you show. Unfortunately i didn't get screen grab of it.
I then added an attribute to align the data structure and debugged again. The data looked normal.
I removed the attribute and I tried debugging at least 15 times. I can't seem to produce the same issue. Maybe it was just a random one time fluke?
