Other Parts Discussed in Thread: RM57L843, HALCOGEN
Tool/software: TI C/C++ Compiler
The attached project was created in CCS 10, targeting a RM57L843 using source code generated by HalCoGen. The project selects the GNU v7.2.1 (Linaro) compiler installed by CCS in the gcc-arm-none-eabi-7-2017-q4-major-win32 directory.
The following C function in the source/HL_system.c file:
resetSource_t getResetSource(void)
{
register resetSource_t rst_source;
if ((SYS_EXCEPTION & (uint32)POWERON_RESET) != 0U)
{
/* power-on reset condition */
rst_source = POWERON_RESET;
/* Clear all exception status Flag and proceed since it's power up */
SYS_EXCEPTION = 0x0000FFFFU;
}
else if ((SYS_EXCEPTION & (uint32)EXT_RESET) != 0U)
{
/* Reset caused due to External reset. */
rst_source = EXT_RESET;
SYS_EXCEPTION = (uint32)EXT_RESET;
}
else if ((SYS_EXCEPTION & (uint32)DEBUG_RESET) !=0U)
{
/* Reset caused due Debug reset request */
rst_source = DEBUG_RESET;
SYS_EXCEPTION = (uint32)DEBUG_RESET;
}
else if ((SYS_EXCEPTION & (uint32)OSC_FAILURE_RESET) != 0U)
{
/* Reset caused due to oscillator failure.
Add user code here to handle oscillator failure */
rst_source = OSC_FAILURE_RESET;
SYS_EXCEPTION = (uint32)OSC_FAILURE_RESET;
}
else if ((SYS_EXCEPTION & (uint32)WATCHDOG_RESET) !=0U)
{
/* Reset caused due watchdog violation */
rst_source = WATCHDOG_RESET;
SYS_EXCEPTION = (uint32)WATCHDOG_RESET;
}
else if ((SYS_EXCEPTION & (uint32)WATCHDOG2_RESET) !=0U)
{
/* Reset caused due watchdog violation */
rst_source = WATCHDOG2_RESET;
SYS_EXCEPTION = (uint32)WATCHDOG2_RESET;
}
else if ((SYS_EXCEPTION & (uint32)CPU0_RESET) !=0U)
{
/* Reset caused due to CPU0 reset.
CPU reset can be caused by CPU self-test completion, or
by toggling the "CPU RESET" bit of the CPU Reset Control Register. */
rst_source = CPU0_RESET;
SYS_EXCEPTION = (uint32)CPU0_RESET;
}
else if ((SYS_EXCEPTION & (uint32)SW_RESET) != 0U)
{
/* Reset caused due to software reset. */
rst_source = SW_RESET;
SYS_EXCEPTION = (uint32)SW_RESET;
}
else
{
/* No_reset occured. */
rst_source = NO_RESET;
}
return rst_source;
}
Results in the following generated assembler (as shown in the Debug/HL_system.s file created by using the -save-temps -fverbose-asm options to make the compiler save the generated assembler):
.align 2 .global getResetSource .syntax unified .arm .fpu vfpv3-d16 .type getResetSource, %function getResetSource: .LFB7: .loc 1 454 0 .cfi_startproc @ Naked Function: prologue and epilogue provided by programmer. @ args = 0, pretend = 0, frame = 0 @ frame_needed = 0, uses_anonymous_args = 0 @ ../source/HL_system.c:457: if ((SYS_EXCEPTION & (uint32)POWERON_RESET) != 0U) .loc 1 457 0 mvn r3, #0 @ tmp127, ldr r3, [r3, #-27] @ _1, MEM[(volatile uint32 *)4294967268B] tst r3, #32768 @ _1, bne .L25 @, @ ../source/HL_system.c:465: else if ((SYS_EXCEPTION & (uint32)EXT_RESET) != 0U) .loc 1 465 0 mvn r3, #0 @ tmp130, ldr r3, [r3, #-27] @ _3, MEM[(volatile uint32 *)4294967268B] tst r3, #8 @ _3, bne .L26 @, @ ../source/HL_system.c:471: else if ((SYS_EXCEPTION & (uint32)DEBUG_RESET) !=0U) .loc 1 471 0 mvn r3, #0 @ tmp133, ldr r3, [r3, #-27] @ _5, MEM[(volatile uint32 *)4294967268B] tst r3, #2048 @ _5, bne .L27 @, @ ../source/HL_system.c:477: else if ((SYS_EXCEPTION & (uint32)OSC_FAILURE_RESET) != 0U) .loc 1 477 0 mvn r3, #0 @ tmp136, ldr r3, [r3, #-27] @ _7, MEM[(volatile uint32 *)4294967268B] tst r3, #16384 @ _7, bne .L28 @, @ ../source/HL_system.c:484: else if ((SYS_EXCEPTION & (uint32)WATCHDOG_RESET) !=0U) .loc 1 484 0 mvn r3, #0 @ tmp139, ldr r3, [r3, #-27] @ _9, MEM[(volatile uint32 *)4294967268B] tst r3, #8192 @ _9, bne .L29 @, @ ../source/HL_system.c:490: else if ((SYS_EXCEPTION & (uint32)WATCHDOG2_RESET) !=0U) .loc 1 490 0 mvn r3, #0 @ tmp142, ldr r3, [r3, #-27] @ _11, MEM[(volatile uint32 *)4294967268B] tst r3, #4096 @ _11, bne .L30 @, @ ../source/HL_system.c:496: else if ((SYS_EXCEPTION & (uint32)CPU0_RESET) !=0U) .loc 1 496 0 mvn r3, #0 @ tmp145, ldr r3, [r3, #-27] @ _13, MEM[(volatile uint32 *)4294967268B] tst r3, #32 @ _13, bne .L31 @, @ ../source/HL_system.c:504: else if ((SYS_EXCEPTION & (uint32)SW_RESET) != 0U) .loc 1 504 0 mvn r3, #0 @ tmp148, ldr r3, [r3, #-27] @ _15, MEM[(volatile uint32 *)4294967268B] tst r3, #16 @ _15, bne .L32 @, @ ../source/HL_system.c:513: rst_source = NO_RESET; .loc 1 513 0 mov r0, #0 @ <retval>, .LVL18: @ ../source/HL_system.c:517: } .loc 1 517 0 .LVL19: .L25: @ ../source/HL_system.c:463: SYS_EXCEPTION = 0x0000FFFFU; .loc 1 463 0 mvn r3, #0 @ tmp128, movw r2, #65535 @ tmp129, str r2, [r3, #-27] @ tmp129, MEM[(volatile uint32 *)4294967268B] @ ../source/HL_system.c:460: rst_source = POWERON_RESET; .loc 1 460 0 mov r0, #32768 @ <retval>, .LVL20: .L26: @ ../source/HL_system.c:469: SYS_EXCEPTION = (uint32)EXT_RESET; .loc 1 469 0 mov r0, #8 @ tmp132, mvn r3, #0 @ tmp131, str r0, [r3, #-27] @ tmp132, MEM[(volatile uint32 *)4294967268B] .LVL21: .L27: @ ../source/HL_system.c:475: SYS_EXCEPTION = (uint32)DEBUG_RESET; .loc 1 475 0 mov r0, #2048 @ tmp135, mvn r3, #0 @ tmp134, str r0, [r3, #-27] @ tmp135, MEM[(volatile uint32 *)4294967268B] .LVL22: .L28: @ ../source/HL_system.c:482: SYS_EXCEPTION = (uint32)OSC_FAILURE_RESET; .loc 1 482 0 mov r0, #16384 @ tmp138, mvn r3, #0 @ tmp137, str r0, [r3, #-27] @ tmp138, MEM[(volatile uint32 *)4294967268B] .LVL23: .L29: @ ../source/HL_system.c:488: SYS_EXCEPTION = (uint32)WATCHDOG_RESET; .loc 1 488 0 mov r0, #8192 @ tmp141, mvn r3, #0 @ tmp140, str r0, [r3, #-27] @ tmp141, MEM[(volatile uint32 *)4294967268B] .LVL24: .L30: @ ../source/HL_system.c:494: SYS_EXCEPTION = (uint32)WATCHDOG2_RESET; .loc 1 494 0 mov r0, #4096 @ tmp144, mvn r3, #0 @ tmp143, str r0, [r3, #-27] @ tmp144, MEM[(volatile uint32 *)4294967268B] .LVL25: .L31: @ ../source/HL_system.c:502: SYS_EXCEPTION = (uint32)CPU0_RESET; .loc 1 502 0 mov r0, #32 @ tmp147, mvn r3, #0 @ tmp146, str r0, [r3, #-27] @ tmp147, MEM[(volatile uint32 *)4294967268B] .LVL26: .L32: @ ../source/HL_system.c:508: SYS_EXCEPTION = (uint32)SW_RESET; .loc 1 508 0 mov r0, #16 @ tmp150, mvn r3, #0 @ tmp149, str r0, [r3, #-27] @ tmp150, MEM[(volatile uint32 *)4294967268B] .cfi_endproc .LFE7: .size getResetSource, .-getResetSource
The generated assembler seems to have garbled the if structure in the source function and placed all the assignments to SYS_EXCEPTION in one linear sequence which are all executed unconditionally at the end of the function. Also, there is no "bx lr" at the end of the function, so execution just continues into what ever follows the getResetSource function in memory.
