Having troubles with printf

[gazalou]

Hello,
I have problem with printf. Can someone help me ?

here is the code :

const char hello_world[] = {"hello world"};
char ramstr[30];

printf ("hello world"); // that works

strcpy(ramstr,hello_world);
printf(ramstr); // that doesn't work
printf("%s",ramstr); // that doesn't work

memcpy(ramstr,hello_world,12);
printf(ramstr); // that doesn't work
printf("%s",ramstr); // that doesn't work

Thank you.
Marc.

[PCM programmer]

There are no pointers to constant strings in CCS.

The code below will work.

[gazalou]

thank you "PCM PROGRAMER"

but still doesn't work.

here is another working example :

i=1;
printf("hello world %d time",i);

I'm using PCH on a 18f8720 may i have trouble with string.h ?

[Foppie]

[Gazalou]

Hello,

Still digging with my problem of printf.

When I use rs232 WITHOUT using enable pin

printf ("hello world");
strcpy(ramstr,"hello world");
printf("%s",ramstr);

I get Two corrects "hello world".


When I use rs232 WITH using enable pin=G0 on 18f8720

printf ("hello world");
strcpy(ramstr,"hello world");
printf("%s",ramstr);

I get only one "hello world" ( the first one ), and the final "d" of the second.

What I mean is that printf always sends the correct data ( checked on a oscilloscope) And the enable pin is correctly managed only with "immediate" strings ( Also checked on oscilloscope ).

I use serial #2 of the 18f8720 (rxd=pin_G2, txd=Pin_G1, enable=Pin_G0). other pins of port G aren't used.

Can someone help me ?

[Humberto]

Enable doesn´t have any conexion with the problem you mention, unless you are using RS485.

#use RS232 Option ENABLE means that the selected pin (PIN_G0) goes High during transmision only.
It is used to handle the Tx_Enable in RS485 transceivers.


Humberto

[Gazalou]

Thanks Humberto,

But I'm using Rs485 !

What I wanted to say is that all the printf's go out from the tx pin but in some cases the enable pin seems not to work.

If I do printf(hello world") I can see the enable pin "enabling the rs-485 transceiver" for each character.

If I do printf("%s",memorystring) the enable pin won't work for all character.

regards

[PCM programmer]