sn8_usb_ep1.asm

来自「sonix系列mcu USB库汇编代码,用于进行2250系列mcu」· 汇编 代码 · 共 48 行

;***********************************************************************
;	USB Endpoint 1 function 
;=======================================================================
;This file is for Endpoint 1.
;EP1 FIFO address 0x08 ~ 0x17
;***********************************************************************
EP1_FUNCTION:	
		
WRITE_EP1:
		EP1_WR_RAM_addr_set #0x08	;ep1 FIFO address
		EP1_WR_RAM_data	#0x0	
		EP1_WR_RAM_addr_set #0x09	
		EP1_WR_RAM_data	#0x0	
		EP1_WR_RAM_addr_set #0x0A
		EP1_WR_RAM_data	#0x0
		EP1_WR_RAM_addr_set #0x0B
		EP1_WR_RAM_data	#0x0				
		EP1_WR_RAM_addr_set #0x0C	
		EP1_WR_RAM_data	#0x0	
		EP1_WR_RAM_addr_set #0x0D	
		EP1_WR_RAM_data	#0x0	
		EP1_WR_RAM_addr_set #0x0E
		EP1_WR_RAM_data	#0x0
		EP1_WR_RAM_addr_set #0x0F
		EP1_WR_RAM_data	#0x0	

		mov	a, #0x0
		cmprs	a, HALT1
		jmp	_ep1_stall
		jmp	_ep1_normal

_ep1_normal:
		mov	a, #10101000b	;1.keep enable ep1 (bit7 = 1)
					;2.counter = 8   ; send 8 bytes to host       
					;3.ACK response
		b0mov	UE1R, a	
		;mov	a, #0x80	; Return NAK
		;b0mov	UE1R,a		
		ret

_ep1_stall:
		mov	a, #11000000b	;EP1 STALL					 
		b0mov	UE1R, a	
		ret

//==============================================================//
//		End of EP1 function				//
//==============================================================//