Other Parts Discussed in Thread: CONTROLSUITE
I am using the TMS320x28027. I am running the code from the following directory C:\ti\controlSUITE\device_support\f2802x\v230\f2802x_examples_structs\f28027_flash_kernel uisng the Code Composer Studio Version: 6.1.1.00022 debugger.
I wrote my own serial down loader in visual studio to parse a my applications intel hex file and load it. When it comes to writing the entryaddr. I am using the one I found in my applicatoins map file as follows
OUTPUT FILE NAME: <GOI_ACIM.out>
ENTRY POINT SYMBOL: "_c_int00" address: 003f5813
I set a brake point just before before Exit_Boot.asm returns as shown.
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
While I am stopped in the debugger at the LRETR statement above. I load the GOI_ACIM.out which are the symbols for my application. I then hit F5 to single step.
The debugger complains about not being able to find the following file Boot28.inc
I found the file here and pointed the debugger at it.
C:\ti\ccsv6\tools\compiler\ti-cgt-c2000_15.9.0.STS\lib\src\Boot28.inc
This allows me to single step to the following code in Boot28.inc
_c_int00: .asmfunc
****************************************************************************
* INITIALIZE STACK POINTER. *
****************************************************************************
MOV SP,#__stack ; set to beginning of stack space
I singe step down to the last line I am showing in the is function.
****************************************************************************
* PROCESS CINIT INITIALIZATION TABLE. TABLE IS IN PROGRAM MEMORY IN THE *
* FOLLOWING FORMAT: *
* *
* .word <length of init data in words> *
* .word or .long <address of variable to initialize> *
* .word <init data> *
* .word ... *
* *
* If the variable's address is greater than 65535 (located in 'far' *
* memory), then the address field of the cinit record will be 32-bits *
* instead of the default 16-bits. The length value is negated to tag *
* cinit records for those variables located in far memory. *
* *
* The init table is terminated with a zero length *
* *
****************************************************************************
MOVL XAR7,#cinit ; point XAR7 at start of table
CLRC TC ; reset TC bit used as far flag
B START, UNC ; jump to start processing
LOOP:
MOVB AH,#0 ; zero out upper addr bits
PREAD AL,*XAR7 ; load address of variable to be inited
ADDB XAR7,#1 ; point to initialization data
B GET_DATA,NTC ; get data if variable is not far
CLRC TC ; reset TC bit used as far flag
PREAD AH,*XAR7 ; otherwise, get hi bits of 22-bit addr
ADDB XAR7,#1
GET_DATA:
MOVL XAR6,ACC ; address
RPT AR1 ; repeat length + 1 times
When I single step past the RPT AR1 line above the debugger says
No source available for "0x3ff5f6"
I then load the Boot Rom symbols from the the following path.
C:\ti\controlSUITE\libs\utilities\boot_rom\2802x\2802x_boot_rom_v2_0\Release\TMS320x2802x_boot_rom_Gold_v200.out
My code is stopped here inside
C:\ti\controlSUITE\libs\utilities\boot_rom\2802x\2802x_boot_rom_v2_0\source\SelectMode_Boot.c
void WaitBoot(void)
{
WatchDogEnable();
for(;;)
{
// If the emulator stops here
// a) change EMU_KEY to 0x55AA
// b) write the appropriate boot mode to EMU_BMODE
// c) perform a debugger reset, and run
asm(" ESTOP0");
}
}
I add expressions for the following variables and change there values in the debugger. I then do a CPU reset as the per the instructions in the above WaitBoot code above
EmuKey = 0x55AA
EmuBMode = 0x000B (Flash Boot)
This takes me to the following code in
C:\ti\controlSUITE\libs\utilities\boot_rom\2802x\2802x_boot_rom_v2_0\source\Init_Boot.asm
; Initalize the stack pointer.
__stack: .usect ".stack",0
MOV SP, #__stack ; Initalize the stack pointer
; Initalize the device for running in C28x mode.
C28OBJ ; Select C28x object mode
C28ADDR ; Select C27x/C28x addressing
C28MAP ; Set blocks M0/M1 for C28x mode
CLRC PAGE0 ; Always use stack addressing mode
MOVW DP,#0 ; Initialize DP to point to the low 64 K
CLRC OVM
; Set PM shift of 0
SPM 0
; Decide which boot mode to use
LCR _SelectBootMode
I then single step all the way through SelectBootMode
Uint32 SelectBootMode()
{
Uint32 EntryAddr;
Uint16 BootMode;
WatchDogService();
EALLOW;
// Before waking up the flash
// set the POR to the minimum trip point
// If the device was configured by the factory
// this write will have no effect.
*BORTRIM = 0x0100;
// At reset we are in /4 mode. Change to /1
// Calibrate the ADC and internal OSCs
SysCtrlRegs.PLLSTS.bit.DIVSEL = DIVSEL_BY_1;
SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1;
(*Device_cal)();
SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 0;
// Init two locations used by the flash API with 0x0000
Flash_CPUScaleFactor = 0;
Flash_CallbackPtr = 0;
EDIS;
// Read the password locations - this will unlock the
// CSM only if the passwords are erased. Otherwise it
// will not have an effect.
CsmPwl.PSWD0;
CsmPwl.PSWD1;
CsmPwl.PSWD2;
CsmPwl.PSWD3;
CsmPwl.PSWD4;
CsmPwl.PSWD5;
CsmPwl.PSWD6;
CsmPwl.PSWD7;
// If GPIO37/TSO is connected to JTAG,
// read the EMU_KEY_LOC and EMU_BOOT_LOC
// If the key is invalid, assign WAIT to the
// boot mode.
if(DevEmuRegs.DEVICECNF.bit.TRSTn == 1)
{
if(EmuKey != 0x55AA)
{
BootMode = WAIT_BOOT;
}
else BootMode = EmuBMode;
}
// GPIO37/TSO is not connected to JTAG,
// read the state of GPIO34 and GPIO37 to determine
// the boot mode. Store the mode in the EMU_BOOT_LOC
// and EMU_KEY_LOC for use later when GPIO37/TSO is
// connected to JTAG.
else
{
BootMode = GpioDataRegs.GPBDAT.bit.GPIO37 << 1;
BootMode |= GpioDataRegs.GPBDAT.bit.GPIO34;
EALLOW;
EmuBMode = BootMode;
EmuKey = 0x55AA;
EDIS;
}
if(BootMode == WAIT_BOOT) WaitBoot();
WatchDogDisable();
if(BootMode == GET_BOOT)
{
BootMode = (*Get_mode)();
}
if(BootMode == FLASH_BOOT) EntryAddr = FLASH_ENTRY_POINT;
else if(BootMode == OTP_BOOT) EntryAddr = OTP_ENTRY_POINT;
else if(BootMode == RAM_BOOT) EntryAddr = RAM_ENTRY_POINT;
else if(BootMode == SCI_BOOT) EntryAddr = SCI_Boot();
else if(BootMode == SPI_BOOT) EntryAddr = SPI_Boot();
else if(BootMode == I2C_BOOT) EntryAddr = I2C_Boot();
else if(BootMode == PARALLEL_BOOT) EntryAddr = Parallel_Boot();
else if(DevEmuRegs.DEVICECNF.bit.TRSTn == 0)
{
EntryAddr = FLASH_ENTRY_POINT;
}
else WaitBoot();
WatchDogEnable();
return EntryAddr;
}
When I get to the end of the code above
EntryAddr = 0x003F7FF6
I then single step again the back into C:\ti\controlSUITE\libs\utilities\boot_rom\2802x\2802x_boot_rom_v2_0\source\Init_Boot.asm all the way to the last statement
LCR _SelectBootMode
; Cleanup and exit. At this point the EntryAddr
; is located in the ACC register
BF _ExitBoot,UNC
;-----------------------------------------------
; _ExitBoot
;-----------------------------------------------
;-----------------------------------------------
;This module cleans up after the boot loader
;
; 1) Make sure the stack is deallocated.
; SP = 0x400 after exiting the boot
; loader
; 2) Push 0 onto the stack so RPC will be
; 0 after using LRETR to jump to the
; entry point
; 2) Load RPC with the entry point
; 3) Clear all XARn registers
; 4) Clear ACC, P and XT registers
; 5) LRETR - this will also clear the RPC
; register since 0 was on the stack
;-----------------------------------------------
_ExitBoot:
;-----------------------------------------------
; Insure that the stack is deallocated
;-----------------------------------------------
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
;eof ----------
When I get to the last statement above and single step execution then goes to LB wd_disable in the following code
***********************************************************************
* Function: codestart section
*
* Description: Branch to code starting point
***********************************************************************
.sect "codestart"
code_start:
.if WD_DISABLE == 1
LB wd_disable ;Branch to watchdog disable code
.else
LB _c_int00 ;Branch to start of boot.asm in RTS library
.endif
When I single step past the LBwd_disable and end up in the following code inside
C:\ti\controlSUITE\libs\utilities\boot_rom\2802x\2802x_boot_rom_v2_0\source\ITrapIsr.asm
;-----------------------------------------------
; _ITRAPIsr
;-----------------------------------------------
;-----------------------------------------------
; This is the ITRAP interrupt service routine for
; thet boot ROM CPU vector table. This routine
; would be called should an ITRAP be encoutered
; before the PIE module was initalized and enabled.
;
; This module performs the following actions:
;
; 1) enables the watchdog
; 2) loops forever
;-----------------------------------------------
.sect ".Isr"
_ITRAPIsr:
SETC OBJMODE ;Set OBJMODE for 28x object code
EALLOW ;Enable EALLOW protected register access
MOVZ DP, #7029h>>6 ;Set data page for WDCR register
MOV @7029h, #0028h ;Clear WDDIS bit in WDCR to enable Watchdog
EDIS ;Disable EALLOW protected register access
SB 0,UNC ;Loop forever
;eof ----------
What am doing wrong? How can I get my loaded application to boot?
