[sdcc-devel]Serial I/O for ds390

[Scott H. <sh...@da...>]

Hello all..  I'm trying to edit the serial390 routines to make them modular,
where I can utilize the other serial port if necessary.  I've gotten a lot
of code working, but I'm trying to clean it up now.  I have a lot of
functions like:
if(port==1)
  SBUF1 = blah;
else if(port==0
  SBUF0 = blah;

I'm trying to come up with a way now that I can basically have a pointers to
the sfrs and sbits.  I've experimented around with the following code, but
it doesn't seem to work the way I thought it would.  Is what I'm trying to
do possible with sdcc?  Or, is there a recommended way of achieving the same
thing?

typedef struct
{
	sfr SCON; // serial control
		sbit RI;
		sbit TI;
		sbit RB8;
		sbit TB8;
		sbit REN;
		sbit SM2;
		sbit SM1;
		sbit SM0;
		sbit FE; // depending on SMOD0
	sfr SBUF; // serial 0 data buffer
	sfr CON; // power control
	sfr TL; // timer 0 lsb
	sfr TH; // timer 0 msb
}
_COMstruct;

struct _COM0
{
	sfr at 0x98 SCON0; // serial 0 control
		sbit at 0x98 RI_0;
		sbit at 0x99 TI_0;
		sbit at 0x9a RB8_0;
		sbit at 0x9b TB8_0;
		sbit at 0x9c REN_0;
		sbit at 0x9d SM2_0;
		sbit at 0x9e SM1_0;
		sbit at 0x9f SM0_0;
		sbit at 0x9f FE_0; // depending on SMOD0
	sfr at 0x99 SBUF0; // serial 0 data buffer
	sfr at 0x87 PCON; // power control
	sfr at 0x8a TL0; // timer 0 lsb
	sfr at 0x8c TH0; // timer 0 msb
}
COM0;

struct _COM1
{
	sfr at 0xc0 SCON1; // serial 1 control
		sbit at 0xc0 RI_1;
		sbit at 0xc1 TI_1;
		sbit at 0xc2 RB8_1;
		sbit at 0xc3 TB8_1;
		sbit at 0xc4 REN_1;
		sbit at 0xc5 SM2_1;
		sbit at 0xc6 SM1_1;
		sbit at 0xc7 SM0_1;
		sbit at 0xc7 FE_1; // depending on SMOD0
	sfr at 0xc1 SBUF1; // serial 1 data buffer
	sfr at 0xd8 WDCON; // watch dog
	sfr at 0x8b TL1; // timer 1 msb
	sfr at 0x8d TH1; // timer 1 msb
}
COM1;

typedef _COMstruct* COM;
COM ports[2] = { (COM)&COM0, (COM)&COM1 };


--
Scott Hughes - sh...@da...
Engineer, Auto Information
Dallas Semiconductor