I only get a case with insert several zero on special platform a few years
ago
Finally , I can only use ascII string convert first .then transfer over
uart and convert back in receiver
I dont know if this is related with chipset , This case is only happen on
QNX platform 6.4.1
2015-02-11 11:57 GMT+08:00 Przemek Klosowski <przemek.klosow...@gmail.com>:
> I am not sure if I understand--please clarify.
>
> On Sun, Feb 8, 2015 at 11:25 AM, oli4gate <oli4.depoor...@gmail.com>
> wrote:
> > Hi,
> >
> > over the uart port I would like to send out following hexadecimal string
> > C5C301000000000076.
> ...
> > unsigned char tx_buf[9] =
> > {0xC5,0xC3,0x01,0x00,0x00,0x00,0x00,0x00,0x76}; //unsigned is 0<>255
> signed
> > is -128<>127
> > unsigned char *p_tx_buf = &tx_buf[0]; //points to the first element
> of
> > the tx_buf
> >
> > int fd;
> >
> > //open uart2 for tx/rx, not controlling device
> > if((fd = open("/dev/ttyO4", O_RDWR | O_NOCTTY | O_NDELAY)) < 0)
> > printf("Unable to open uart2 access .\n");
> > else
> > printf("uart2 opened succesfully.\n");
> >
> > if(write(fd,&tx_buf,sizeof(tx_buf))<0)
>
> Ok, so you are not sending the hex string, but rather the binary
> values. I never ran it this way so I am not sure what might prevent it
> from working this way, but the following stack overflow discussion
> might be helpful:
> http://stackoverflow.com/questions/506805/binary-data-over-serial-terminal
>
> > printf("ERROR : tx not send.\n");
> > else
> > for(unsigned int i = 0; i < sizeof(tx_buf); ++i)
> > {
> > std::cout << std::hex << (int)tx_buf[i];
> > }
> > printf(" : tx send \n");
>
> You do realize that the 'else' block contains just the for() {} loop
> and not the printf statement?
> (your indentation seems to indicate otherwise) I recommend using
> curly braces always even if the conditional block has just one
> statement.
>
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