[AVR] Variable value convert in decimal

[BHARGAVSHANKHALPARA]

Hi all...

i am programming ATMEGA32 microcontroller and ATMEL STUDIO 6 for programming in my application.

in my application user enter 3 difference value which i have store in char variable.

At the end i combine this 3 value in one variable and compare it with predefine value. when i combine in one variable it automatically convert into decimal.

for example i have 3 variable named S1,S2,S3

user enter S1=2,S2=0,S3=9;

at end combine value in TOTAL variable which is INT.

TOTAL = (S3 | (S2 << 4) | (S1 << 8));

so TOTAL value should be 209

but it shows after decimal conversation 521.

when i compare it with 209 this gives no result, but it gives result when my predefine value 521.

i want to get result when user enter 209 and my predefine value also 209.

 

[FvM]

You seem to be assuming that 2<<8 is 200. In my calulation it's 512.

The C operator << is describing binary rather than BCD operation.

 

[RudeBoy]

you can try thiis:
uint_16 a;
int b;
a = S3;
a = (a<<8)|S2;
a = (a<<8)|S1;
b = a ;

 

[milan.rajik]

You can try (S1 * 100) + (S2 * 10) + S3.

 

[FvM]

you can try this:
uint_16 a;
int b;
a = S3;
a = (a<<8)|S2;
a = (a<<8)|S1;
b = a ;

Did you understand at all what the original poster wants to achieve? It rather looks like he want to assemble decimal digits, like

TOTAL = (S3 + (S2 * 10) + (S1 * 100));

respectively performed as sequential action

TOTAL = (S1*10 + S2)*10 + S3;

 

[RudeBoy]

:thumbsdown::thumbsdown: