CODEWITHSUNDEEP
calgorithmif-statementembeddedsimplicity-studio
john
john

Reputation: 1

Is there any algorithmic approach for this problem?

I have set of opcodes to carryout a specific function but the tricky part is here: for example in the posted code below, channelABC is the input, which means: if in my product side has channel A, or channel b, or channel c is selected, it should match,OR, if in my product side . if channel b and c are selected it should match, basically if one or more of the Channels match (with input side or product side),- Led has to glow .

i tried to map it, but i am not sure of the right way to do it

typedef enum{
    ZoneA  = 0x01,
    ZoneB  = 0x02,
    ZoneC  = 0x04,
    ZoneD  = 0x08,
    zoneE  = 0x10,
    ZoneF  = 0x20,
    ZoneG  = 0x40,
    ZoneH  = 0x80,
    ZoneABCD = 0x0f,
    ZoneAB = 0x03,
    ZoneAC = 0x05,
    ZoneAD = 0x09,
    ZoneBC = 0x06,
    ZoneBD = 0x0A,
    ZoneCD = 0x0C,
    ZoneABC = 0x07 ,
    ZoneABD = 0x0B,
    ZoneBCD = 0x0E,
    NOZONE  = 0x00

}zone;


railzone =buffers[0];  //rail zone read the value , which is  the first element in the buffer when the packet info is transformed to buffer
            //railzone will have the input here
            if(railzone ==ZoneABCD || railzone == ZoneA  || railzone == ZoneB || railzone == ZoneC || railzone == ZoneD  || railzone == ZoneAB
                    || railzone == ZoneAC || railzone == ZoneAD || railzone == ZoneBC || railzone == ZoneBD || railzone == ZoneCD || railzone == ZoneABC ||
                    railzone == ZoneABD || railzone == ZoneBCD   )      
            {


            }

I am giving input as ZONEABC, AND I am having the zoneAB in my product and since two of the zoneA and b are present, it should glow the LED

Upvotes: 0

Views: 75

Answers (2)

Swanand
Swanand

Reputation: 4115

You can use concept of masks. Define a Mask for which zones your product supports i.e. create a variable and set the bit for every zone your product supports. For example, If your product supports Zone A and Zone C

(Considering your enum)

#define PRODUCT_MASK (ZoneA | ZoneC)

Then sanitize input as

if((railzone_input & PRODUCT_MASK)  != 0)
{
    // Zone is supported 
}
else
{
   // Zone is not supported
}

If your railzone_input is ZoneBC (i.e. 6) and as I considered in above example, your PRODUCT_MASK will be 5. So 6 & 5 = 4 which is != 0 i.e. Zone is supported.

If your railzone_input is ZoneB (i.e. 2) then 2 & 5 = 0 which is == 0 i.e. Zone is not supported.

Upvotes: 1

Jack
Jack

Reputation: 133609

It's not totally clear what you need to do but it looks like you want to carry out a specific operation if some bits of the variable are set, this can be done with & (and) operator.

For example, if you want to do something on any railzone which has zone A enabled (bit 0), then you could do 

railzone = ZoneAB;

if ((railzone & ZoneA) == ZoneA) {
  // turn on led for ZoneA?
}

Upvotes: 0

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