esl_external_read_data.asm

来自「ELAN eAM eDSP esL Serial an assembly ex」· 汇编 代码 · 共 68 行

.IFNDEF	@_LIB_EXTERNAL_READ_DATA_ASM
@_LIB_EXTERNAL_READ_DATA_ASM		.EQU		1


.CODE

;*****************************************************************************************
; SUBROUTINE: EXTERNAL_READ_WORD
; DESCRIPTION: Read one word data from external memory(Mode: Byte Mode).
;              SPI FLASH is the default external memory type.
;              
;              If user wants to use other type of external memory,
;              the subroutine of manipulating external memory remains to be designed by user for their specific applications, 
;              and user needs to replace the following code with designed code
;              .IF (@__LIB_ENABLEPERIPHERAL == 1)    
;                  CALL @_LIB_F_SPI_RX_2BYTE 
;              .ENDIF
; 
; The external memory read subroutine must follow four rules:
; 1. The input address will be stored in R1(high address) and R0(low address) by speech decoder, 
;    so external memory subroutine must get address from R1 and R0.
; 2. The external memory must be set as byte mode.
; 3. In external memory subroutine, two consecutive bytes must be combined as one word.
; 4. The output data(word) of external memory subroutine must be put in R0.
;
;*****************************************************************************************
  
.EXTERN @_LIB_F_SPI_RX_2BYTE

.GLOBAL S1_EXTERNAL_READ_WORD
S1_EXTERNAL_READ_WORD:
;********************************
;user can program code from here
;********************************
  
    ;CALL @_LIB_F_SPI_RX_2BYTE 


RET

.GLOBAL S2_EXTERNAL_READ_WORD
S2_EXTERNAL_READ_WORD:
;********************************
;user can program code from here
;********************************
  
    ;CALL @_LIB_F_SPI_RX_2BYTE 

RET

.GLOBAL M_EXTERNAL_READ_WORD
M_EXTERNAL_READ_WORD:
;********************************
;user can program code from here
;********************************
   
    ;CALL @_LIB_F_SPI_RX_2BYTE 

RET


Mapping_Nand_Add:
	//CALL Mapping_Nand_Add_Check
	RET


.ENDIF		;@_LIB_EXTERNAL_READ_DATA_ASM