/******************************************************************************
*                                                                             *
*        **********                                                           *
*       ************                                                          *
*      ***        ***                                                         *
*     ***    ++    ***                                                        *
*     ***   +  +   ***                      CHIPCON                           *
*     ***   +                                                                 *
*     ***   +  +   ***                                                        *
*     ***    ++    ***                                                        *
*      ***        ***                                                         *
*       ************                                                          *
*        **********                                                           *
*                                                                             *
*******************************************************************************

Filename:     flashWritePage.s51
Target:       cc2511
Author:       EFU
Revised:      20/6-2006
Revision:     x.x
******************************************************************************/
;;-----------------------------------------------------------------------------
;; See hal.h for a description of this function.
;;-----------------------------------------------------------------------------
#include "ioCC2511.h"


                 MODULE  flashWritePage.s51
                 RSEG RCODE
                 PUBLIC halFlashWritePage
                 FUNCTION halFlashWritePage, 0203H

                 DS 1

 halFlashWritePage:




                ; R2 (LSB) and R3 (MSB) contains the start address of the data to be copied to flash (BYTE xdata * buf )
                ; R4 (LSB) and R5 (MSB) contains the start address of the buffer from which the program can be run in RAM
                ; R1 contains the flash page the data is to be written to

                ; Make sure that interrupts are off
                MOV     R0, #01;
                JBC     EA, intsOffHere;
                MOV     R0, #00;
intsOffHere:
                ; Storing the initial data pointer select.
                PUSH    DPH;
                PUSH    DPL;
                PUSH    DPH1;
                PUSH    DPL1;
                PUSH    DPS;

                ; Set DPTR0 = address in XDATA RAM to which the flash write procedure which is to be copied.
                MOV     A, R5;
                MOV     DPH, A;
                MOV     A, R4;
                MOV     DPL, A;

                ; Saving the start address of the actual flash write procedure in XDATA RAM.
                PUSH    DPL;
                PUSH    DPH;

                ; Set DPTR1 = start address of the procedure template in CODE
                ; This procedure is to be copied to XDATA.
                MOV     DPH1, #HIGH(copy2FlashProcStart);
                MOV     DPL1, #LOW(copy2FlashProcStart);

                ; Use R1 to count loops...
                MOV     R4, #copy2FlashProcEnd - copy2FlashProcStart;

                ; Copy @DPTR1->@DPTR0
copyLoop:       MOV     DPS, #1;
                MOVX    A, @DPTR;
                INC     DPTR;
                MOV     DPS, #0;
                MOVX    @DPTR, A;
                INC     DPTR;
                DJNZ    R4, copyLoop;

                ; xdata pointer to start of data is in R2 and R3
                ; Set up data pointer 1
                MOV     DPL1, R2
                MOV     DPH1, R3

                ; Setting the flash page to write to
                ; Bits 6:1 of FADDRH indicates which page to write to.
                MOV     A,R1
                RL      A
                MOV     FADDRH, A
                MOV     FADDRL, #00H

                ; Setting the flash write timing according to the clock division factor in CLKCON.
                MOV     A,CLKCON
                ANL     A,#07H
                MOV     R4,A
                INC     R4
                MOV     A,#044H
rotate:         CLR     C
                RRC     A
                DJNZ    R4,rotate
                MOV     FWT,A

                ; Data pointer 0 indicates where the start of the copied routine in XDATA is located.
                ; Pointer to start of data to copy is in data pointer 1.
                MOV     DPS, #0;
                POP     DPH;
                POP     DPL;

                MOV     R3,#02H
                MOV     R4,#00H
                MOV     R5,#02H

                ; Make the indirect function call
                LCALL   indirCall;

                ; Using the original data pointer
                POP     DPS;
                POP     DPL1;
                POP     DPH1;
                POP     DPL;
                POP     DPH;

                MOV     A, R0;
                JZ      intsWereOff;
                SETB    EA;
intsWereOff:
                RET;


                ; Calling the flash write in XDATA RAM. (Pointed to by DPTR0)
indirCall:      CLR     A;
                JMP     @A+DPTR;



                ; Starting to write to flash
copy2FlashProcStart:
                ; Using data pointer 1 which indicates start of data to be copied to flash
                ; Erasing the page
                MOV     FCTL, #01H
waitEraseLoop:  MOV     A, FCTL
                ANL     A,#80H
                JNZ     waitEraseLoop

                MOV     DPS, #1;

                ; Turning on flash write.
                MOV     FCTL,#02H

                ; Writing data
                ;R3 = 2
                ;       R4 = 0
;               ;               R5 = 4
writeBlock:          ;
                                        MOVX    A, @DPTR
                                        INC     DPTR
                                        MOV     FWDATA, A
                                DJNZ    R5,writeBlock
                                MOV     R5,#02H
waitLoop:                       MOV     A, FCTL
                                ANL     A,#40H
                                JNZ     waitLoop

                        DJNZ    R4,writeBlock
                DJNZ    R3,writeBlock


done:           RET;
copy2FlashProcEnd:
                END;