Hello Mike,
It seems like you discovered a bug. Would you be so kind as to open
a bug tracker item for it?
Thanks,
Maarten
> Hi All,
>
> Perhaps someone can help with the two functions shown below.
>
> The scenario is:
> I desire to empty a hardware buffer, and just throw away it's contents.
> In both functions the requirement is to read BtRdl1 until the hardware
> device at this address shows empty as in (BtRdl1Stat & Rmpty)
>
> Assumption:
> Just placing an identifier, BtRdl1, will cause it to be read.
>
> The result:
> Function 1 does not work
> Function 2 does work
>
> The question:
> Why does function 1 not work?
>
> Target:
> mcs51
>
> SDCC:
> C:\SDCC>sdcc -v
> SDCC : mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08
> 2.7.4 #5003 (Feb 11 2008) (MINGW32)
>
>
> volatile __xdata uchar at (Bt8370_Base + 0xA8) BtRdl1;
> volatile __xdata uchar at (Bt8370_Base + 0xA9) BtRdl1Stat;
> #define Rmpty 0x04
>
> Func 1
> ---------
>
> void l1_ClrBt8370_DL(void)
> {
> while (BtRdl1Stat & Rmpty) BtRdl1;
> }
>
>
> Func 2
> ---------
>
>
> void l1_ClrBt8370_DL(void)
> {
> while (BtRdl1Stat & Rmpty)
> {
> BtRdl1;
> }
> }
>
>
> Kind Regards, Mike
>
>
> Mike Allsworth
> Tel: +27 (0)11 794 5273
> Cell: +27 (0)82 572 3079
> email: [EMAIL PROTECTED]
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