translate string number to unsigned long

[rvdbogae]

Hi All

I try to read an unsigned long via the RS232 into my pic.
I dont know how to do.

In the following code I read a sting (number) into my pic (16F877).
Is it possible to translate it in a unsigned long?
Are there other (more simple) possebilities?

////////////////code/////////////////////////////////////

#fuses HS,NOWDT,NOPROTECT

#use delay(clock=20000000)
#use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7)


main() {

char string[50];

printf("give the number of pulses\r\n");
gets(string);
printf("\%S\n", string);
while(1);
//// now translate string to unsigned long
}

//////////////////////////////////////////////////////////////

thanks for help,
ruud
___________________________
This message was ported from CCS's old forum
Original Post ID: 3976

[Hans Wedemeyer]

If it is an ASCII string the simply use the atoi(&string); function.

If you simply want to receive the bytes directly as binary values, then put them into a struct/union one by one and you do not have to convert anything.
Example:-

struct HighLow
{
char l;
char h;
};

union HL
{
long L;
struct HighLow hl;
};


union HL MyNumber;

MyNumber.hl.h = getchar(); // receive the high byte first
MyNumber.hl.l = getchar(); // receive the low byte next

Now you have the unsigned long value as MyNumber.L and no conversion needed.

unsigned long XYZ = MyNumber.L;

Then when you need to send it back out simply do this:-

putchar(MyNumber.hl.h);
putchar(MyNumber.hl.l);




:=////////////////code/////////////////////////////////////
:=
:=#fuses HS,NOWDT,NOPROTECT
:=
:=#use delay(clock=20000000)
:=#use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7)
:=
:=
:=main() {
:=
:= char string[50];
:=
:= printf("give the number of pulses\r\n");
:= gets(string);
:= printf("\%S\n", string);
:= while(1);
:= //// now translate string to unsigned long
:=}
:=
:=//////////////////////////////////////////////////////////////
:=
:=thanks for help,
:= ruud
___________________________
This message was ported from CCS's old forum
Original Post ID: 3981

[Todd C. Micallef]

Another way to convert is to use the get_long()function in the input.c file inside the drivers dir. The function defaults to returning a signed value though.

:=Hi All
:=
:=I try to read an unsigned long via the RS232 into my pic.
:=I dont know how to do.
:=
:=In the following code I read a sting (number) into my pic (16F877).
:=Is it possible to translate it in a unsigned long?
:=Are there other (more simple) possebilities?
:=
:=////////////////code/////////////////////////////////////
:=
:=#fuses HS,NOWDT,NOPROTECT
:=
:=#use delay(clock=20000000)
:=#use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7)
:=
:=
:=main() {
:=
:= char string[50];
:=
:= printf("give the number of pulses\r\n");
:= gets(string);
:= printf("\%S\n", string);
:= while(1);
:= //// now translate string to unsigned long
:=}
:=
:=//////////////////////////////////////////////////////////////
:=
:=thanks for help,
:= ruud
___________________________
This message was ported from CCS's old forum
Original Post ID: 3986