flashw_asm.asm

基于凌阳单片机的闪存的读写操作。是使用汇编语言实现的程序

//函数：_F_write_flash_asm（）
//语法：
.DEFINE C_FLASH_MATCH			0xAAAA
.DEFINE C_FLASH_PAGE_ERASE		0x5511		//擦除一页
.DEFINE C_FLASH_SEQUENT_PGM		0x5544		//写多个字	

//****************************************************
//void F_write_flash_asm(int address,int data,int N)
//描述：写闪存
//参数：address, data, N 
//返回：无
//****************************************************
	
.code
.public _F_write_flash_asm
.DEFINE  P_Flash_Ctrl  0x7555
_F_write_flash_asm: .proc	
    push bp to [sp]
	bp = sp+1
	r1 = [bp+3]						//flash base address
	r2 = [bp+4]						//data
	r3 = [bp+5]						//多个字节	
	r4 = C_FLASH_MATCH				//AAAA
	[P_Flash_Ctrl] = r4
L_FlashWriteLoop:
	r4 = C_FLASH_SEQUENT_PGM		//5544
	[P_Flash_Ctrl] = r4
	r4 = r2
	r2=r2+1
	[r1++] = r4

	r3 -= 1
	jnz L_FlashWriteLoop
//	[P_Flash_Ctrl] = r3				//写结束
	pop bp from [sp]
	retf
	.ENDP