[ts-7000] Re: RS-485 full duplex sending and not recieving

["khouryelie" <>]

hello everyone,

it's

RX+ COM2 to TX+ (485 cable )
RX+ (485 cable ) to TX+ COM2
rx- COM2 to tx- (485 cable )
rx- (485 cable ) to tx- COM2

and it is not a cable problem, cause the cable supports full duplex and is 
working on another machine in full duplex

and i am failing to receive even in loopback test
i have tried loopback testing with 422 port it works 

the only problem i have is with 485 full duplex on my COM2 port on th ts-7200

this is from the program about RTS setting

#define TIOC_SBCC485 _IOW('T',0x70,int) /*TS RTS/485 mode Clear*/
#define TIOC_SBCS485 _IOW('T',0x71, int) /*TS RTS/485 mode Set */

i tried with RTS Set and clear and stil not receiving data

i strongly think it must be something i have to do in my program that is made 
to set COM2 to 485 FULL DUPLEX

_______________________________________

#include<unistd.h>
#include<sys/types.h>
#include<sys/mman.h>
#include<stdio.h>
#include<fcntl.h>
#include<assert.h>
#include<linux/ts_sbc.h>
#include<asm/ioctls.h>
#include<sys/ioctl.h>

// futher info at 
http://wiki.embeddedarm.com/wiki/Linux_for_ARM_on_TS-72XX_User%27s_Guide#RS-485_Support_on_COM2


#define TIOC_SBCC485 _IOW('T',0x70, int) /*TS RTS/485 mode Clear*/
#define TIOC_SBCS485 _IOW('T',0x71, int) /*TS RTS/485 mode Set */
#define AUTO485FD 1
#define RTSMODE 2
#define AUTO485HD 4

int main(void)
{
        int fd,status;
        char mcr;
        fd = open("/dev/ttyAM1", O_RDWR | O_SYNC);
        if (fd == -1) 
        {
                perror("Error opening file for writing");
        }

        mcr = AUTO485FD;
        status=ioctl (fd, TIOC_SBCS485, &mcr);
        if(status==-1) 
        {
                printf("ERROR\n");
        }

}
________________________________________  or this 

#include<unistd.h>
#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); // we open /dev/mem to acces 
read and write 
        if (fd == -1) 
        {
                perror("Error opening file for writing");
        }

        base = (unsigned char 
*)mmap(0,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x22C00000); // map  
the user space file(/dev/mem) to memory and write at address 0x22C00000
        if (base == MAP_FAILED)
        {
                perror ("mmap");
                return 1;
        }
      
        *base = 0x01; // set value in 0x22C00000 to hex 01 

        close(fd);      
}




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