[ts-7000] Problem with RS485 enable register

["e_fenimore" <>]

I noticed in the hardware manual that, to use the RS485 feature on the
TS-7260, one must write a byte value to the address 0x22C0_0000.  For
example, it says to enable half duplex 9600 baud access, one must
write a 0x04 to this address.

Interesting thing is, when I read from this address in code, I get
values alternating between 188 and 252.  If I use the peek16 value
supplied on the development cd, I am able to see it set to 0.  

The code I used to read it in my program is (borrowed from other code
elsewhere):

        bool ccc;
        volatile unsigned char *chip;
        int fd;

        fd = open( "/dev/mem", O_RDWR );
        chip = (vuchar*)mmap( 0, getpagesize(), PROT_READ|PROT_WRITE,
                        MAP_SHARED, fd, 0x22C00000 );
        printf("RS 485 mode %d\n", *chip);
        close( fd );

Any ideas?



 
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