Hello,
trying to port Miro Samek's example: https://github.com/QuantumLeaps/FreeACT - into my nucleo-F429ZI board.
As a reference there is project running on nucleo-h743zi
what i did:
changed all configs to be STM32F429zi valid, changed ld file, makefile, etc etc.
When running software (via debugger), unfortunatelly i got hardfault in this piece of code (rtos-port-part: port.c)
static void prvPortStartFirstTask( void )
{
/* Start the first task. This also clears the bit that indicates the FPU is
* in use in case the FPU was used before the scheduler was started - which
* would otherwise result in the unnecessary leaving of space in the SVC stack
* for lazy saving of FPU registers. */
__asm volatile (
" ldr r0, =0xE000ED08 \n"/* Use the NVIC offset register to locate the stack. */
" ldr r0, [r0] \n"
" ldr r0, [r0] \n"
" msr msp, r0 \n"/* Set the msp back to the start of the stack. */
" mov r0, #0 \n"/* Clear the bit that indicates the FPU is in use, see comment above. */
" msr control, r0 \n"
" cpsie i \n"/* Globally enable interrupts. */
" cpsie f \n"
" dsb \n"
" isb \n"
" svc 0 \n"/* System call to start first task. */
" nop \n"
" .ltorg \n"
);
}
after dissamebly looks like this:
after i step to next line, r0=0x0
when i want to go next line, i end up in hardfault handler:
CFSR, HFSR:
0xe000ed28: 0x00000082 0x40000000 0x00000001 0x00000000
reading CFRS i know that Data Access Violation occurred but my question is why?
i already read https://www.freertos.org/Documentation/02-Kernel/03-Supported-devices/04-Demos/ARM-Cortex/RTOS-Cortex-M3-M4 and setup prios as (file FreeRTOSConfig.h):
#define configKERNEL_INTERRUPT_PRIORITY ( 15 << 4 ) /* Priority 7, or 255 as only the top three bits are implemented. This is the lowest priority. */
/* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!
See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
#define configMAX_SYSCALL_INTERRUPT_PRIORITY ( 5 << 4 ) /* Priority 5, or 160 as only the top three bits are implemented. */
but it didnt help.
ld is relatively simple(just modified from other nucleo project and adjusted to F429zi specific):
/*****************************************************************************
* Product: Linker script for STM32F429zi, GNU-ARM linker
*****************************************************************************/
OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(Reset_Handler) /* entry Point */
MEMORY { /* memory map of STM32F429ZI */
CCMRAM (xrw) : ORIGIN = 0x10000000, LENGTH = 64K
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 192K
ROM (rx) : ORIGIN = 0x08000000, LENGTH = 2048K
}
/* The size of the stack used by the application. NOTE: you need to adjust */
STACK_SIZE = 4096;
/* The size of the heap used by the application. NOTE: you need to adjust */
HEAP_SIZE = 1024;
SECTIONS {
.isr_vector : { /* the vector table goes FIRST into ROM */
KEEP(*(.isr_vector)) /* vector table */
. = ALIGN(4);
} >ROM
.text : { /* code and constants */
. = ALIGN(4);
*(.text) /* .text sections (code) */
*(.text*) /* .text* sections (code) */
*(.rodata) /* .rodata sections (constants, strings, etc.) */
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
KEEP (*(.init))
KEEP (*(.fini))
. = ALIGN(4);
} >ROM
.preinit_array : {
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array*))
PROVIDE_HIDDEN (__preinit_array_end = .);
} >ROM
.init_array : {
PROVIDE_HIDDEN (__init_array_start = .);
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array*))
PROVIDE_HIDDEN (__init_array_end = .);
} >ROM
.fini_array : {
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP (*(.fini_array*))
KEEP (*(SORT(.fini_array.*)))
PROVIDE_HIDDEN (__fini_array_end = .);
} >ROM
_etext = .; /* global symbols at end of code */
.stack : {
__stack_start__ = .;
. = . + STACK_SIZE;
. = ALIGN(4);
__stack_end__ = .;
} >RAM
.data : AT (_etext) {
__data_load = LOADADDR (.data);
__data_start = .;
*(.data) /* .data sections */
*(.data*) /* .data* sections */
. = ALIGN(4);
__data_end__ = .;
_edata = __data_end__;
} >RAM
_siccmram = LOADADDR(.ccmram);
/* CCM-RAM section
*
* IMPORTANT NOTE!
* If initialized variables will be placed in this section,
* the startup code needs to be modified to copy the init-values.
*/
.ccmram :
{
. = ALIGN(4);
_sccmram = .; /* create a global symbol at ccmram start */
*(.ccmram)
*(.ccmram*)
. = ALIGN(4);
_eccmram = .; /* create a global symbol at ccmram end */
} >CCMRAM AT> RAM
.bss : {
__bss_start__ = .;
*(.bss)
*(.bss*)
*(COMMON)
. = ALIGN(4);
_ebss = .; /* define a global symbol at bss end */
__bss_end__ = .;
} >RAM
__exidx_start = .;
.ARM.exidx : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) } >RAM
__exidx_end = .;
PROVIDE ( end = _ebss );
PROVIDE ( _end = _ebss );
PROVIDE ( __end__ = _ebss );
.heap : {
__heap_start__ = .;
. = . + HEAP_SIZE;
. = ALIGN(4);
__heap_end__ = .;
} >RAM
/* Remove information from the standard libraries */
/DISCARD/ : {
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}
}
any support appriciated!
