memeory settings FX2

BIT banging seems to be very slow .I cant se anything on scope.

vanitha

BIT banging seems to be very slow .I cant se anything on scope.

vanitha

>I am using port E , I have already replaced OUTC by IOE(0xB1).

Maybe, some bug of your code disturbs it.
Post your code for the asm routine, spiwritebyte and spireadbyte

>Now Iam also re enumerating the FX2. I have used TD_Init() and TD_poll() in the coding .

Re-enumeration is not required, when you don't use USB on FX2.
As you are testing a short code on MON51 debugger, TD_Init() and TD_poll() is also not required.

Tsuneo

I have code for spibytewrite only .Iam using PORT E.PE.0 is my SCLK and PE.7 is my SDO and PE.3 is my CS.

?PR?SPIWRITEBYTE?MODULE segment code
 ?DT?SPIWRITEBYTE?MODULE segment data overlayable

 PUBLIC _spiwritebyte, ?_spiwritebyte?BYTE

 rseg ?DT?SPIWRITEBYTE?MODULE
 ?_spiwritebyte?BYTE:
 d: ds 1

 rseg ?PR?SPIWRITEBYTE?MODULE

 CLKHIGH equ 00000001B ;Bitmask to turn clk pin high
 CLKLOW equ  11111110B ;Bitmask to turn clk pin low
 BITHIGH equ 10000000B ;Bitmask to turn out pin high
 BITLOW equ  01111111B ;Bitmask to turn out pin low

 IOE XDATA 0xB1 ;7F98H

 _spiwritebyte:

 mov DPTR,#IOE ;point to IOE
 mov R6, #8 ;set up loop
 loop:
 mov A, R7 ;move data to send to A
 rrc A ;rotate left through carry to send LSB first
 mov R7, A ;save rotated
 movx A, @DPTR ;setup to change bit
 jc highbit ;if bit is high jump
 anl A, #BITLOW ;else set bit low
 sjmp skip ;skip setting bit high
 highbit:
 orl A, #BITHIGH ;set out high and clock
 skip:
 orl A, #CLKHIGH ;set clock bit high
 movx @DPTR, A ;output data
 nop ;may need this to stretch clock high time
 anl A, #CLKLOW ;set clock low
 movx @DPTR, A ;output low clock
 djnz R6, loop ;repeat eight times
 ret
 end

Vanitha

I solved the problem finally. The IOE in FX2 is located in direct memory access region. The indirect addressing (movx @DPTR, A ) was causing problem. Simply it can be written as mov 0xB1,A. DPTR is not required as it is used to access external memory.
Vanitha