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Hi all,

another tedious but eventually illuminating day at the bench .........

After much trial and error

           mov     #0xff,w0                ;supply CLK, wait for response
           call    send_w0                 ;with SDO high (FF data)
           bclr    SPI1STAT,#SPIROV        ;*** must clear overflow flag **=
*
           btss    SPI1STAT,#SPIRBF        ;before test for full rx buffer
           bra     $-2
           mov     SPI1BUF,w2              ;read buffer
           mov     #0x30,w0                ;add #30 for display
           add     w0,w2,w0
           mov     w0,[w5++]               ;store in RAM for display later

The solution that seems to work is clearing SPIROV before reading
the receive buffer. Every time. Even though the previous read is meant
to prevent SPIROV being set, ie there is no overflow to report because
the previous data has been read

"SPIROV =3D 1 ; A new byte/word is completely received and discarded.
The user software has not read the previous data in the SPIxBUF register"

I might be wrong but AFAICT this is not documented. It's not in any of
the timing diagrams for example. Clearing SPIROV is mentioned as one
of the steps when setting up the SPI module, but not that it must be used
throughout. And I'm not sure exactly how SPIROV being set stops the
SPIRBF being set. But if this another 33..x02 SPI silicon issue then who
knows

Now what I see on the LCD is / 1 /, which corresponds to 2F 31 2F,
or FF 01 FF when the added #30 is taken off, and that's correct

In one of the forum threads some guy said "I don't mind bug hunting".
Personally I'm getting pissed off finding things wrong with products
and manuals. Days are long and hard enough already thanks

Joe

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