boot.tpl

cypress公司PROC开发源码（cywusb6953）

ENDIF ; SYSTEM_SMALL_MEMORY_MODEL

IF ( SYSTEM_LARGE_MEMORY_MODEL )
    mov   reg[CUR_PP], >__r0           ; force direct addr mode instructions
                                       ; to use the Virtual Register page.

    ; Dereference the constant (flash) pointer pXIData to access the start
    ; of the extended idata area, "xidata." Xidata follows the end of the
    ; text segment and may have been relocated by the Code Compressor.
    ;
    mov   A, >__pXIData                ; Get the address of the flash
    mov   X, <__pXIData                ;   pointer to the xidata area.
    push  A
    romx                               ; get the MSB of xidata's address
    mov   [__r0], A
    pop   A
    inc   X
    adc   A, 0
    romx                               ; get the LSB of xidata's address
    swap  A, X
    mov   A, [__r0]                    ; pXIData (in [A,X]) points to the
                                       ;   XIData structure list in flash
    jmp   .AccessStruct

    ; Unpack one element in the xidata "structure list" that specifies the
    ; values of C variables. Each structure contains 3 member elements.
    ; The first is a pointer to a contiguous block of RAM to be initial-
    ; ized. Blocks are always 255 bytes or less in length and never cross
    ; RAM page boundaries. The list terminates when the MSB of the pointer
    ; contains 0xFF. There are two formats for the struct depending on the
    ; value in the second member element, an unsigned byte:
    ; (1) If the value of the second element is non-zero, it represents
    ; the 'size' of the block of RAM to be initialized. In this case, the
    ; third member of the struct is an array of bytes of length 'size' and
    ; the bytes are copied to the block of RAM.
    ; (2) If the value of the second element is zero, the block of RAM is
    ; to be cleared to zero. In this case, the third member of the struct
    ; is an unsigned byte containing the number of bytes to clear.

.AccessNextStructLoop:
    inc   X                            ; pXIData++
    adc   A, 0
.AccessStruct:                         ; Entry point for first block
    ;
    ; Assert: pXIData in [A,X] points to the beginning of an XIData struct.
    ;
    M8C_ClearWDT                       ; Clear the watchdog for long inits
    push  A
    romx                               ; MSB of RAM addr (CPU.A <- *pXIData)
    mov   reg[MVW_PP], A               ;   for use with MVI write operations
    inc   A                            ; End of Struct List? (MSB==0xFF?)
    jz    .C_RTE_WrapUp                ;   Yes, C runtime environment complete
    pop   A                            ; restore pXIData to [A,X]
    inc   X                            ; pXIData++
    adc   A, 0
    push  A
    romx                               ; LSB of RAM addr (CPU.A <- *pXIData)
    mov   [__r0], A                    ; RAM Addr now in [reg[MVW_PP],[__r0]]
    pop   A                            ; restore pXIData to [A,X]
    inc   X                            ; pXIData++ (point to size)
    adc   A, 0
    push  A
    romx                               ; Get the size (CPU.A <- *pXIData)
    jz    .ClearRAMBlockToZero         ; If Size==0, then go clear RAM
    mov   [__r1], A                    ;             else downcount in __r1
    pop   A                            ; restore pXIData to [A,X]

.CopyNextByteLoop:
    ; For each byte in the structure's array member, copy from flash to RAM.
    ; Assert: pXIData in [A,X] points to previous byte of flash source;
    ;         [reg[MVW_PP],[__r0]] points to next RAM destination;
    ;         __r1 holds a non-zero count of the number of bytes remaining.
    ;
    inc   X                            ; pXIData++ (point to next data byte)
    adc   A, 0
    push  A
    romx                               ; Get the data value (CPU.A <- *pXIData)
    mvi   [__r0], A                    ; Transfer the data to RAM
    tst   [__r0], 0xff                 ; Check for page crossing
    jnz   .CopyLoopTail                ;   No crossing, keep going
    mov   A, reg[ MVW_PP]              ;   If crossing, bump MVW page reg
    inc   A
    mov   reg[ MVW_PP], A
.CopyLoopTail:
    pop   A                            ; restore pXIData to [A,X]
    dec   [__r1]                       ; End of this array in flash?
    jnz   .CopyNextByteLoop            ;   No,  more bytes to copy
    jmp   .AccessNextStructLoop        ;   Yes, initialize another RAM block

.ClearRAMBlockToZero:
    pop   A                            ; restore pXIData to [A,X]
    inc   X                            ; pXIData++ (point to next data byte)
    adc   A, 0
    push  A
    romx                               ; Get the run length (CPU.A <- *pXIData)
    mov   [__r1], A                    ; Initialize downcounter
    mov   A, 0                         ; Initialize source data

.ClearRAMBlockLoop:
    ; Assert: [reg[MVW_PP],[__r0]] points to next RAM destination and
    ;         __r1 holds a non-zero count of the number of bytes remaining.
    ;
    mvi   [__r0], A                    ; Clear a byte
    tst   [__r0], 0xff                 ; Check for page crossing
    jnz   .ClearLoopTail               ;   No crossing, keep going
    mov   A, reg[ MVW_PP]              ;   If crossing, bump MVW page reg
    inc   A
    mov   reg[ MVW_PP], A
    mov   A, 0                         ; Restore the zero used for clearing
.ClearLoopTail:
    dec   [__r1]                       ; Was this the last byte?
    jnz   .ClearRAMBlockLoop           ;   No,  continue
    pop   A                            ;   Yes, restore pXIData to [A,X] and
    jmp   .AccessNextStructLoop        ;        initialize another RAM block

.C_RTE_WrapUp:
    pop   A                            ; balance stack

ENDIF ; SYSTEM_LARGE_MEMORY_MODEL

C_RTE_Done:

ENDIF ; C_LANGUAGE_SUPPORT

    ;-------------------------------
    ; Voltage Stabilization for SMP
    ;-------------------------------

IF ( POWER_SETTING & POWER_SET_5V0)    ; 5.0V Operation
IF ( SWITCH_MODE_PUMP ^ 1 )            ; SMP is operational
    ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    ; When using the SMP at 5V, we must wait for Vdd to slew from 3.1V to
    ; 5V before enabling the Precision Power-On Reset (PPOR).
    ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    or   reg[INT_MSK0],INT_MSK0_SLEEP
    M8C_SetBank1
    and   reg[OSC_CR0], ~OSC_CR0_SLEEP
    or    reg[OSC_CR0],  OSC_CR0_SLEEP_512Hz
    M8C_SetBank0
    M8C_ClearWDTAndSleep                   ; Restart the sleep timer
    mov   reg[INT_VC], 0                   ; Clear all pending interrupts
.WaitFor2ms:
    tst   reg[INT_CLR0], INT_MSK0_SLEEP    ; Test the SleepTimer Interrupt Status
    jz   .WaitFor2ms                       ; Branch fails when 2 msec has passed
ENDIF ; SMP is operational
ENDIF ; 5.0V Operation

    ;-------------------------------
    ; Set Power-On Reset (POR) Level
    ;-------------------------------
    M8C_SetBank1

IF (POWER_SETTING & POWER_SET_2V7)             ; 2.7V Operation?
                                               ;  Yes, lowest trip already set
ELSE                                           ;   No, must adjust POR...
IF (POWER_SETTING & POWER_SET_3V3)             ; 3.3V Operation?
    or   reg[VLT_CR], VLT_CR_POR_MID           ;   Yes, change to midpoint trip
ELSE
IF (POWER_SETTING & POWER_SET_5V0)             ; 5.0V Operation?
 IF (POWER_SETTING & POWER_SET_SLOW_IMO)       ; and Slow Mode?
    or   reg[VLT_CR], VLT_CR_POR_MID           ;   Yes, set to midpoint trip
 ELSE                                          ;    No, fast mode
  IF ( CPU_CLOCK_JUST ^ OSC_CR0_CPU_24MHz )    ;      As fast as 24MHz?
    or   reg[VLT_CR], VLT_CR_POR_MID           ;         No, change to midpoint trip
  ELSE ; 24HMz                                 ;
    or    reg[VLT_CR], VLT_CR_POR_HIGH         ;        Yes, switch to	highest setting
  ENDIF ; 24MHz
 ENDIF ; Slow Mode
ENDIF ; 5.0V Operation
ENDIF ; 3.3V Operation
ENDIF ; 2.7V Operation

    M8C_SetBank0

    ;----------------------------
    ; Wrap up and invoke "main"
    ;----------------------------

    ; Disable the Sleep interrupt that was used for timing above.  In fact,
    ; no interrupts should be enabled now, so may as well clear the register.
    ;
    mov  reg[INT_MSK0],0

    ; Everything has started OK. Now select requested CPU & sleep frequency.
    ;
    M8C_SetBank1
    mov  reg[OSC_CR0],(SLEEP_TIMER_JUST | CPU_CLOCK_JUST)
    M8C_SetBank0

    ; Global Interrupt are NOT enabled, this should be done in main().
    ; LVD is set but will not occur unless Global Interrupts are enabled.
    ; Global Interrupts should be enabled as soon as possible in main().
    ;
    mov  reg[INT_VC],0             ; Clear any pending interrupts which may
                                   ; have been set during the boot process.
IF ENABLE_LJMP_TO_MAIN
    ljmp  _main                    ; goto main (no return)
ELSE
    lcall _main                    ; call main
.Exit:
    jmp  .Exit                     ; Wait here after return till power-off or reset
ENDIF

    ;---------------------------------
    ; Library Access to Global Parms
    ;---------------------------------
    ;
 bGetPowerSetting:
_bGetPowerSetting:
    ; Returns value of POWER_SETTING in the A register.
    ; No inputs. No Side Effects.
    ;
IF (POWER_SETTING & POWER_SET_2V7)
    mov   A, POWER_SETTING | POWER_SET_SLOW_IMO
ELSE
    mov   A, POWER_SETTING          ; Supply voltage and internal main osc
ENDIF
    ret

    ;---------------------------------
    ; Order Critical RAM & ROM AREAs
    ;---------------------------------
    ;  'TOP' is all that has been defined so far...

    ;  ROM AREAs for C CONST, static & global items
    ;
    AREA lit               (ROM, REL, CON)   ; 'const' definitions
    AREA idata             (ROM, REL, CON)   ; Constants for initializing RAM
__idata_start:

    AREA func_lit          (ROM, REL, CON)   ; Function Pointers
__func_lit_start:

IF ( SYSTEM_LARGE_MEMORY_MODEL )
    ; We use the func_lit area to store a pointer to extended initialized
    ; data (xidata) area that follows the text area. Func_lit isn't
    ; relocated by the code compressor, but the text area may shrink and
    ; that moves xidata around.
    ;
__pXIData:         word __text_end           ; ptr to extended idata
ENDIF

    AREA psoc_config       (ROM, REL, CON)   ; Configuration Load & Unload
    AREA UserModules       (ROM, REL, CON)   ; User Module APIs

    ; CODE segment for general use
    ;
    AREA text (ROM, REL, CON)
__text_start:

    ; RAM area usage
    ;
    AREA data              (RAM, REL, CON)   ; initialized RAM
__data_start:

    AREA virtual_registers (RAM, REL, CON)   ; Temp vars of C compiler
    AREA InterruptRAM      (RAM, REL, CON)   ; Interrupts, on Page 0
    AREA bss               (RAM, REL, CON)   ; general use
__bss_start:

; end of file boot.asm