hello jim
thanks for the reply
> I think you need to do a byte write - otherwise you are writing
> hex 00 to 0x22C0_0000 0x22C0_0001 0x22C0_0002 and hex 01 to 0x22C0_0002
> when you write the integer hex 01 to 0x22C0_0000
>
> Just try changing Made to unsigned char *
>
> Don't why you have the infinite loop!
>
first the loop was part of a test i forgot to remove before posting
And i did the following:
__________________________________________________________
#include<sys/types.h>
#include<sys/mman.h>
#include<stdio.h>
#include<fcntl.h>
#include<assert.h>
int main(void)
{
int fd;
volatile unsigned char *base;
fd = open("/dev/mem", O_RDWR | O_SYNC);
base = (unsigned char
*)mmap(0,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x22C00000);
*base = 0x01;
close(fd);
}
it dosnt work,
just i dont understand the following that i found in the manuel
Value MSB MID LSB Mode
0x00 0 0 0 RS-232
0x01 0 0 1 Full-Duplex RS-485
0x02 0 1 0 -- Reserved
0x03 0 1 1 -- Reserved
0x04 1 0 0 Half-Duplex 9600 Baud
0x05 1 0 1 Half-Duplex 19.2Kbaud
0x06 1 1 0 Half-Duplex 57.6Kbaud
0x07 1 1 1 Half-Duplex 115.2Kbaud
COM2 will default to RS-232 mode at reset (COM2 mode register = Hex 00). In
order to switch COM2 into Full duplex RS-485 mode, the COM2 Mode register at
0x22C0_0000 must be set to Hex 01. In this mode, the TX drivers are always
asserted.
ISNT *base=0X01; WHAT I SHOULD DO ?
what do you mean by byte write ?
one more thing this is what they say in the MEMORY AND REGISTER MAP
register address: 0x22C0_0000
function : COM2 RS-485 control register (bits 0-2)
_________________________________________________________
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