LDR r2, =FLASHBase ;FLASH起始地址
//第一步,UNLOCK的64个block,步骤和上边一样
MOV r1,#63 ;63x64k block 计数
01 LDRB r3, =X16_FLASH_COMMAND_CONFIG_SETUP
STRB r3, [r2] ;该block的首地址
LDRB r3, =X16_FLASH_COMMAND_UNLOCK_BLOCK
STRB r3, [r2] ;将Unlock命令写入
ADD r2, r2, #0x10000 ;64K
SUBS r1, r1, #1
BNE %b01
;Unlock OK ;Unlock 完成
//第二布,擦除blocks
LDR r0, =FLASHBase
LDR r1,=63 ;擦除 63x64k block
01 LDR r3, =X16_FLASH_COMMAND_ERASE
LDR r2, =X16_FLASH_COMMAND_CONFIRM
ORR r3, r3, r2, LSL #16
STR r3, [r0]
LDR r3, =X16_FLASH_COMMAND_STATUS ;检查寄存器状态
STRB r3, [r0]
02 LDRB r3, [r0] ;读状态
TST r3, #X16_FLASH_STATUS_READY
BEQ %b02 ;若状态ready,执行下一个
TST r3, #X16_FLASH_STATUS_ERROR
BNE error_erase_block
ADD r0, r0, #0x10000
SUBS r1, r1, #1
BNE %b01
B EraseOK
error_erase_block
..............
;EraseOK ;擦除完成
//第三步,检查FLASH是否为空
;Check FLASH Empty
LDR r4, =FLASHBase
LDR r5, =0x100000 ;检查 1MB
LDR r0, =0xffffffff
loop_1
LDR r1, [r4]
CMP r1, r0 ;比较地址内容和0xffffffff
BNE empty_error
ADD r4, r4, #4
CMP r4, r5
BLO loop_1
B CheckOK
empty_error
.................
CheckOK
.................
;Check empty OK ;检查完成
//第四步,写FLASH
;Burn data to FLASH ROM
LDR r6, =Length_FLASH ;定义数据长度
LDR r0, =FLASH