msp430x24x_flashwrite_01.s43

来自「步进电机驱动程序msp430f247单片机」· S43 代码 · 共 83 行

;*******************************************************************************
;   MSP430x24x Demo - Flash In-System Programming, Copy SegC to SegD
;
;   Description: This program first erases flash seg C, then it increments all
;   values in seg C, then it erases seg C, then copies seg C to seg D.
;   Seg C starts @ 0x1040 and Seg D starts @0x01000
;   ACLK = n/a, MCLK = SMCLK = CALxxx_1MHZ = 1MHz
;   //* Set Breakpoint in the Mainloop to avoid Stressing Flash *//
;
;                MSP430F249
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;
;  B. Nisarga
;  Texas Instruments Inc.
;  September 2007
;  Built with IAR Embedded Workbench Version: 3.42A
//******************************************************************************
#include "msp430x24x.h"
;-------------------------------------------------------------------------------
#define     value   R4
;-------------------------------------------------------------------------------
            RSEG    CSTACK                  ; Define stack segment
;-------------------------------------------------------------------------------
            RSEG    CODE                    ; Assemble to Flash memory
;-------------------------------------------------------------------------------
RESET       mov.w   #SFE(CSTACK),SP         ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
CheckCal    cmp.b   #0FFh,&CALBC1_1MHZ      ; Calibration constants erased?
            jeq     Trap
            cmp.b   #0FFh,&CALDCO_1MHZ
            jne     Load  
Trap        jmp     $                       ; Trap CPU!!
Load        mov.b   &CALBC1_1MHZ,&BCSCTL1   ; Set DCO to 1MHz
            mov.b   &CALDCO_1MHZ,&DCOCTL    ;
SetupFTG    mov.w   #FWKEY+FSSEL0+FN1,&FCTL2; Flash Timing generator = MCLK/3
            clr.b   value                   ; value = value to write to flash
                                            ;
Mainloop    call    #Write_SegC             ; Copy value to segment C
            inc.b   value                   ;
            call    #CopyC2D                ;
            jmp     Mainloop                ; Repeat, SET BREAKPOINT HERE
                                            ;
;-------------------------------------------------------------------------------
Write_SegC ;Input = value, holds value to write to Seg C, R5 used as working reg
;-------------------------------------------------------------------------------
            mov.w   #01040h,R5              ;
Erase_SegC  mov.w   #FWKEY,&FCTL3           ; Lock = 0
            mov.w   #FWKEY+ERASE,&FCTL1     ; Erase bit = 1, allow interrupts
            mov.w   #0,&01040h              ; Dummy write to SegC to erase
Prog_SegC   mov.w   #FWKEY+WRT,&FCTL1       ; Write bit = 1, block interrupts
Prog_L1     mov.b   value,0(R5)             ; Write value to flash
            inc.w   R5                      ;
            cmp.w   #01080h,R5              ;
            jne     Prog_L1                 ;
            mov.w   #FWKEY,&FCTL1           ; Write bit = 0
            mov.w   #FWKEY+LOCK,&FCTL3      ; Lock = 1
            ret                             ;
;-------------------------------------------------------------------------------
CopyC2D    ;Copy Seg C to Seg D, R5 used as working reg.
;-------------------------------------------------------------------------------
Erase_SegD  mov.w   #FWKEY,&FCTL3           ; Lock = 0
            mov.w   #FWKEY+ERASE,&FCTL1     ; Erase bit = 1
            mov.w   #0,&01000h              ; Dummy write to SegD to erase
            mov.w   #01040h,R5              ; R5 = First byte in Seg C
Prog_SegD   mov.w   #FWKEY+WRT,&FCTL1       ; Write bit = 1, block interrupts
            mov.w   #FWKEY,&FCTL3           ; Lock = 0
Prog_L2     mov.b   @R5+,-65(R5)            ; Copy Seg C to Seg D
            cmp.w   #01080h,R5              ;
            jne     Prog_L2                 ;
            mov.w   #FWKEY,&FCTL1           ; Write bit = 0
            mov.w   #FWKEY+LOCK,&FCTL3      ; Lock = 1
            ret                             ;
;-------------------------------------------------------------------------------
            COMMON  INTVEC                  ; Interrupt Vectors
;-------------------------------------------------------------------------------
            ORG     RESET_VECTOR            ; MSP430 RESET Vector
            DW      RESET                   ;
            END