Running SES with SDK v12.2 and debugging an nRF51822 running the ble_app_uart sample application. After running for some period of time (typically 2 - 3 minutes) the debugger stops on a line of assembly (appears to be the same point each time). No error in the console, but the function selector at the top shows "Unknown function at " and some hex address. (Currently 0x000006B0).
Seems to be the same as this: https://devzone.nordicsemi.com/f/nordic-q-a/36352/unknown-function-at-some-address
I've adjusted the flash_placement.xml file and the thumb_crt0.s file to (theoretically) include the expected flash storage. Apparently that was the issue for the previous poster who was also working with the uart example. I haven't found a flash_placement.xml file that's specific to the nRF51822 - the examples I've been working from were for nRF52 devices. Perhaps there's a difference? Here's what I've got:
<!DOCTYPE Linker_Placement_File>
<Root name="Flash Section Placement">
<MemorySegment name="$(FLASH_NAME:FLASH)">
<ProgramSection alignment="0x100" load="Yes" name=".vectors" start="$(FLASH_START:)" />
<ProgramSection alignment="4" load="Yes" name=".init" />
<ProgramSection alignment="4" load="Yes" name=".init_rodata" />
<ProgramSection alignment="4" load="Yes" name=".text" />
<ProgramSection alignment="4" load="Yes" name=".dtors" />
<ProgramSection alignment="4" load="Yes" name=".ctors" />
<ProgramSection alignment="4" load="Yes" name=".rodata" />
<ProgramSection alignment="4" load="Yes" name=".ARM.exidx" address_symbol="__exidx_start" end_symbol="__exidx_end" />
<ProgramSection alignment="4" load="Yes" runin=".fast_run" name=".fast" />
<ProgramSection alignment="4" load="Yes" runin=".data_run" name=".data" />
<ProgramSection alignment="4" load="Yes" runin=".tdata_run" name=".tdata" />
<ProgramSection alignment="4" keep="Yes" load="Yes" runin=".fs_data_run" name=".fs_data" />
</MemorySegment>
<MemorySegment name="$(RAM_NAME:RAM);SRAM">
<ProgramSection alignment="0x100" load="No" name=".vectors_ram" start="$(RAM_START:$(SRAM_START:))" />
<ProgramSection alignment="4" load="No" name=".fast_run" />
<ProgramSection alignment="4" load="No" name=".data_run" />
<ProgramSection alignment="4" load="No" name=".bss" />
<ProgramSection alignment="4" load="No" name=".tbss" />
<ProgramSection alignment="4" load="No" name=".tdata_run" />
<ProgramSection alignment="4" load="No" name=".non_init" />
<ProgramSection alignment="4" keep="Yes" load="No" name=".fs_data_run" address_symbol="__start_fs_data" end_symbol="__stop_fs_data" />
<ProgramSection alignment="4" size="__HEAPSIZE__" load="No" name=".heap" />
<ProgramSection alignment="8" size="__STACKSIZE__" load="No" place_from_segment_end="Yes" name=".stack" />
<ProgramSection alignment="8" size="__STACKSIZE_PROCESS__" load="No" name=".stack_process" />
</MemorySegment>
<MemorySegment name="$(FLASH2_NAME:FLASH2)">
<ProgramSection alignment="4" load="Yes" name=".text2" />
<ProgramSection alignment="4" load="Yes" name=".rodata2" />
<ProgramSection alignment="4" load="Yes" runin=".data2_run" name=".data2" />
</MemorySegment>
<MemorySegment name="$(RAM2_NAME:RAM2)">
<ProgramSection alignment="4" load="No" name=".data2_run" />
<ProgramSection alignment="4" load="No" name=".bss2" />
</MemorySegment>
</Root>
And here's my thumb_crt0.s file:
// ********************************************************************** // * SEGGER Microcontroller GmbH * // * The Embedded Experts * // ********************************************************************** // * * // * (c) 2014 - 2018 SEGGER Microcontroller GmbH * // * (c) 2001 - 2018 Rowley Associates Limited * // * * // * www.segger.com Support: [email protected] * // * * // ********************************************************************** // * * // * All rights reserved. * // * * // * Redistribution and use in source and binary forms, with or * // * without modification, are permitted provided that the following * // * conditions are met: * // * * // * - Redistributions of source code must retain the above copyright * // * notice, this list of conditions and the following disclaimer. * // * * // * - Neither the name of SEGGER Microcontroller GmbH * // * nor the names of its contributors may be used to endorse or * // * promote products derived from this software without specific * // * prior written permission. * // * * // * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND * // * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, * // * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * // * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * // * DISCLAIMED. * // * IN NO EVENT SHALL SEGGER Microcontroller GmbH BE LIABLE FOR * // * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * // * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT * // * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * // * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * // * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * // * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE * // * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * // * DAMAGE. * // * * // ********************************************************************** // // // Preprocessor Definitions // ------------------------ // APP_ENTRY_POINT // // Defines the application entry point function, if undefined this setting // defaults to "main". // // INITIALIZE_STACK // // If defined, the contents of the stack will be initialized to a the // value 0xCC. // // INITIALIZE_SECONDARY_SECTIONS // // If defined, the .data2, .text2, .rodata2 and .bss2 sections will be initialized. // // INITIALIZE_TCM_SECTIONS // // If defined, the .data_tcm, .text_tcm, .rodata_tcm and .bss_tcm sections // will be initialized. // // INITIALIZE_USER_SECTIONS // // If defined, the function InitializeUserMemorySections will be called prior // to entering main in order to allow the user to initialize any user defined // memory sections. // // FULL_LIBRARY // // If defined then // - argc, argv are setup by the debug_getargs. // - the exit symbol is defined and executes on return from main. // - the exit symbol calls destructors, atexit functions and then debug_exit. // // If not defined then // - argc and argv are zero. // - the exit symbol is defined, executes on return from main and loops // #ifndef APP_ENTRY_POINT #define APP_ENTRY_POINT main #endif #ifndef ARGSSPACE #define ARGSSPACE 128 #endif .syntax unified .global _start .extern APP_ENTRY_POINT .global exit .weak exit #ifdef INITIALIZE_USER_SECTIONS .extern InitializeUserMemorySections #endif .section .init, "ax" .code 16 .balign 2 .thumb_func _start: /* Set up main stack if size > 0 */ ldr r1, =__stack_end__ ldr r0, =__stack_start__ subs r2, r1, r0 beq 1f #ifdef __ARM_EABI__ movs r2, #0x7 bics r1, r2 #endif mov sp, r1 #ifdef INITIALIZE_STACK movs r2, #0xCC ldr r0, =__stack_start__ bl memory_set #endif 1: /* Set up process stack if size > 0 */ ldr r1, =__stack_process_end__ ldr r0, =__stack_process_start__ subs r2, r1, r0 beq 1f #ifdef __ARM_EABI__ movs r2, #0x7 bics r1, r2 #endif msr psp, r1 movs r2, #2 msr control, r2 #ifdef INITIALIZE_STACK movs r2, #0xCC bl memory_set #endif 1: /* Copy initialized memory sections into RAM (if necessary). */ ldr r0, =__data_load_start__ ldr r1, =__data_start__ ldr r2, =__data_end__ bl memory_copy ldr r0, =__text_load_start__ ldr r1, =__text_start__ ldr r2, =__text_end__ bl memory_copy ldr r0, =__fast_load_start__ ldr r1, =__fast_start__ ldr r2, =__fast_end__ bl memory_copy ldr r0, =__ctors_load_start__ ldr r1, =__ctors_start__ ldr r2, =__ctors_end__ bl memory_copy ldr r0, =__dtors_load_start__ ldr r1, =__dtors_start__ ldr r2, =__dtors_end__ bl memory_copy ldr r0, =__rodata_load_start__ ldr r1, =__rodata_start__ ldr r2, =__rodata_end__ bl memory_copy ldr r0, =__tdata_load_start__ ldr r1, =__tdata_start__ ldr r2, =__tdata_end__ bl memory_copy ldr r0, =__fs_data_load_start__ ldr r1, =__fs_data_start__ ldr r2, =__fs_data_end__ #ifdef INITIALIZE_SECONDARY_SECTIONS ldr r0, =__data2_load_start__ ldr r1, =__data2_start__ ldr r2, =__data2_end__ bl memory_copy ldr r0, =__text2_load_start__ ldr r1, =__text2_start__ ldr r2, =__text2_end__ bl memory_copy ldr r0, =__rodata2_load_start__ ldr r1, =__rodata2_start__ ldr r2, =__rodata2_end__ bl memory_copy #endif /* #ifdef INITIALIZE_SECONDARY_SECTIONS */ #ifdef INITIALIZE_TCM_SECTIONS ldr r0, =__data_tcm_load_start__ ldr r1, =__data_tcm_start__ ldr r2, =__data_tcm_end__ bl memory_copy ldr r0, =__text_tcm_load_start__ ldr r1, =__text_tcm_start__ ldr r2, =__text_tcm_end__ bl memory_copy ldr r0, =__rodata_tcm_load_start__ ldr r1, =__rodata_tcm_start__ ldr r2, =__rodata_tcm_end__ bl memory_copy #endif /* #ifdef INITIALIZE_TCM_SECTIONS */ /* Zero the bss. */ ldr r0, =__bss_start__ ldr r1, =__bss_end__ movs r2, #0 bl memory_set ldr r0, =__tbss_start__ ldr r1, =__tbss_end__ movs r2, #0 bl memory_set #ifdef INITIALIZE_SECONDARY_SECTIONS ldr r0, =__bss2_start__ ldr r1, =__bss2_end__ mov r2, #0 bl memory_set #endif /* #ifdef INITIALIZE_SECONDARY_SECTIONS */ #ifdef INITIALIZE_TCM_SECTIONS ldr r0, =__bss_tcm_start__ ldr r1, =__bss_tcm_end__ mov r2, #0 bl memory_set #endif /* #ifdef INITIALIZE_TCM_SECTIONS */ /* Initialize the heap */ ldr r0, = __heap_start__ ldr r1, = __heap_end__ subs r1, r1, r0 cmp r1, #8 blt 1f movs r2, #0 str r2, [r0] adds r0, r0, #4 str r1, [r0] 1: #ifdef INITIALIZE_USER_SECTIONS ldr r2, =InitializeUserMemorySections blx r2 #endif /* Call constructors */ ldr r0, =__ctors_start__ ldr r1, =__ctors_end__ ctor_loop: cmp r0, r1 beq ctor_end ldr r2, [r0] adds r0, #4 push {r0-r1} blx r2 pop {r0-r1} b ctor_loop ctor_end: /* Setup initial call frame */ movs r0, #0 mov lr, r0 mov r12, sp .type start, function start: /* Jump to application entry point */ #ifdef FULL_LIBRARY movs r0, #ARGSSPACE ldr r1, =args ldr r2, =debug_getargs blx r2 ldr r1, =args #else movs r0, #0 movs r1, #0 #endif ldr r2, =APP_ENTRY_POINT blx r2 .thumb_func exit: #ifdef FULL_LIBRARY mov r5, r0 // save the exit parameter/return result /* Call destructors */ ldr r0, =__dtors_start__ ldr r1, =__dtors_end__ dtor_loop: cmp r0, r1 beq dtor_end ldr r2, [r0] add r0, #4 push {r0-r1} blx r2 pop {r0-r1} b dtor_loop dtor_end: /* Call atexit functions */ ldr r2, =_execute_at_exit_fns blx r2 /* Call debug_exit with return result/exit parameter */ mov r0, r5 ldr r2, =debug_exit blx r2 #endif /* Returned from application entry point, loop forever. */ exit_loop: b exit_loop .thumb_func memory_copy: cmp r0, r1 beq 2f subs r2, r2, r1 beq 2f 1: ldrb r3, [r0] adds r0, r0, #1 strb r3, [r1] adds r1, r1, #1 subs r2, r2, #1 bne 1b 2: bx lr .thumb_func memory_set: cmp r0, r1 beq 1f strb r2, [r0] adds r0, r0, #1 b memory_set 1: bx lr // default C/C++ library helpers .macro HELPER helper_name .section .text.\helper_name, "ax", %progbits .balign 2 .global \helper_name .weak \helper_name \helper_name: .thumb_func .endm .macro JUMPTO name #if defined(__thumb__) && !defined(__thumb2__) mov r12, r0 ldr r0, =\name push {r0} mov r0, r12 pop {pc} #else b \name #endif .endm HELPER __aeabi_read_tp ldr r0, =__tbss_start__-8 bx lr HELPER abort b . HELPER __assert b . HELPER __aeabi_assert b . HELPER __sync_synchronize bx lr HELPER __getchar JUMPTO debug_getchar HELPER __putchar JUMPTO debug_putchar HELPER __open JUMPTO debug_fopen HELPER __close JUMPTO debug_fclose HELPER __write mov r3, r0 mov r0, r1 movs r1, #1 JUMPTO debug_fwrite HELPER __read mov r3, r0 mov r0, r1 movs r1, #1 JUMPTO debug_fread HELPER __seek push {r4, lr} mov r4, r0 bl debug_fseek cmp r0, #0 bne 1f mov r0, r4 bl debug_ftell pop {r4, pc} 1: ldr r0, =-1 pop {r4, pc} // char __user_locale_name_buffer[]; .section .bss.__user_locale_name_buffer, "aw", %nobits .global __user_locale_name_buffer .weak __user_locale_name_buffer __user_locale_name_buffer: .word 0x0 #ifdef FULL_LIBRARY .bss args: .space ARGSSPACE #endif /* Setup attibutes of stack and heap sections so they don't take up room in the elf file */ .section .stack, "wa", %nobits .section .stack_process, "wa", %nobits .section .heap, "wa", %nobits
Anyone have any ideas?
