MCP3208 problem

[pfo]

convert_to_voltage() works, the mcp3208 also works right, but y the hell isnt the result in the range fron 0 to 4096 (mcp3208 has 12bit) ...


thx!






#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12

#include <MCP3208.C>

void display_data(unsigned long data ) {


printf(" (%ld)",data);
}


void main() {
unsigned long value=0;

adc_init();

printf("Sampling:\r\n");

do {


value = read_analog(0); //channel 0 single mode (ADXL_X)
printf("\n\rCh0: ");
printf(" %ld",value);

value = read_analog(1); //channel 0 single mode (ADXL_Y)
printf(" Ch1: ");
printf(" %ld",value);

} while (TRUE);

}


the result looks like this:


Ch0: 32240 Ch1: -28256
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28256
Ch0: 32240 Ch1: -28256
Ch0: 32240 Ch1: -28256
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28256
Ch0: 32240 Ch1: -28256
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28256
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28256
Ch0: 32240 Ch1: -28256
Ch0: 32240 Ch1: -28240
Ch0: 32240 Ch1: -28240

[Ttelmah]

[PCM programmer]

The functions in MCP3208.C return unsigned 16-bit numbers.
(All CCS integer data types are unsigned by default -- unlike normal C).

So in your printf statements, you need to use %lu instead of %ld.
--------------------

I'm looking at the CCS manual.

In the Jan 2003 manual, right below the Type Specifier chart, they
had this statement:
All types, except float, by default are unsigned; however, [they]
may be preceded by unsigned or signed.

But they don't have that statement in the current manual (May 2003).

This is going to screw up newbies big time.

They haven't changed the compiler. It still has an int or "long int"
as unsigned by default.