Program repeats

Hi John,

If you are able to step through the program, does it ever reach the f2838x_codestartbranch_cpu1.asm file?After it returns from this loop a cleanup process should begin.

Thanks,

Charles

Yes it goes there. When it returns from my program it executes

    BF  _ExitBoot,UNC
      
    MOV SP,#__stack

;-----------------------------------------------
; Clear the bottom of the stack.  This will endup
; in RPC when we are finished
;-----------------------------------------------

    MOV  *SP++,#0
    MOV  *SP++,#0

;-----------------------------------------------
; Load RPC with the entry point as determined
; by the boot mode.  This address will be returned
; in the ACC register.
;-----------------------------------------------

    PUSH ACC
    POP  RPC

;-----------------------------------------------
; Put registers back in their reset state.
;
; Clear all the XARn, ACC, XT, and P and DP
; registers
;
; NOTE: Leave the device in C28x operating mode
;       (OBJMODE = 1, AMODE = 0)
;-----------------------------------------------
    ZAPA
    MOVL  XT,ACC
    MOVZ  AR0,AL
    MOVZ  AR1,AL
    MOVZ  AR2,AL
    MOVZ  AR3,AL
    MOVZ  AR4,AL
    MOVZ  AR5,AL
    MOVZ  AR6,AL
    MOVZ  AR7,AL
    MOVW  DP, #0


;------------------------------------------------
;   Restore ST0 and ST1.  Note OBJMODE is
;   the only bit not restored to its reset state.
;   OBJMODE is left set for C28x object operating
;   mode.
;
;  ST0 = 0x0000     ST1 = 0x0A0B
;  15:10 OVC = 0    15:13      ARP = 0
;   9: 7  PM = 0       12       XF = 0
;      6   V = 0       11  M0M1MAP = 1
;      5   N = 0       10  reserved
;      4   Z = 0        9  OBJMODE = 1
;      3   C = 0        8    AMODE = 0
;      2  TC = 0        7 IDLESTAT = 0
;      1 OVM = 0        6   EALLOW = 0
;      0 SXM = 0        5     LOOP = 0
;                       4      SPA = 0
;                       3     VMAP = 1
;                       2    PAGE0 = 0
;                       1     DBGM = 1
;                       0     INTM = 1
;-----------------------------------------------

    MOV  *SP++,#0
    MOV  *SP++,#0x0A0B
    POP  ST1
    POP  ST0

;------------------------------------------------
;   Jump to the EntryAddr as defined by the
;   boot mode selected and continue execution
;-----------------------------------------------

    LRETR  <== all the above to here =========================v

;eof ----------

code_start:
    .if WD_DISABLE == 1
        LB wd_disable       ;Branch to watchdog disable code      <== This line then ===v
    .else
        LB _c_int00         ;Branch to start of boot._asm in RTS library
    .endif

    .if WD_DISABLE == 1

    .text

wd_disable:
    SETC OBJMODE        ;Set OBJMODE for 28x object code  <== Then all lines here
    EALLOW              ;Enable EALLOW protected register access
    MOVZ DP, #7029h>>6  ;Set data page for WDCR register
    MOV @7029h, #0068h  ;Set WDDIS bit in WDCR to disable WD
    EDIS                ;Disable EALLOW protected register access
    ;LB _c_int00         ;Branch to start of boot._asm in RTS library
    LCR main                                                                                         <== Then we are back to here.

I find it interesting that some imported projects use

  f2838x_codestartbranch_cpu1.asm

while others use

  device\f2838x_codestartbranch.asm

Compared to another project it seems that a value or offset used by LCR is different. I searched for the assy ref manual for half an hour and never found it so it is hard to speculate if this is some conditional instruction but it seems to control the new destination.

At the end of main, would it be possible to put an example_done routine? 

void Example_Done(void)
{
__asm(" ESTOP0");
}

Here is what I have now and I have a breakpoint on line 19.

It stops there and also on line 11, though there is no break point there. Continue button is still green so pressing it causes the program to stop on line 19 again. Round we go, ad infinitum.

//main.c

#include "driverlib.h"
#include "device.h"

//
// Main
//
void Example_Done(void)
{
__asm(" ESTOP0");
}

uint32_t main(void)
{
    Device_init();
    Device_initGPIO();

    Interrupt_initModule();
    Interrupt_initVectorTable();

    //
    // Enable Global Interrupt (INTM) and realtime interrupt (DBGM)
    //
    EINT;
    ERTM;
    Example_Done();
    return(0);
}

John,

It looks like your device is getting reset when you run the program. Did you disable watchdog? I'm wondering whether watchdog reset is resetting the device making it to f2838x_codestartbranch_cpu1.asm etc.

Regards,

Manoj

Hi Manoj,

Yes, it was disabled int Device_init(), which I have not modified.

I created a new project and copied my source code into it and now it works. That would not be so bad except that takes a while as it was necessary to copy the includes and linked resources in the project properties.