Hi List

I have a I/O expander that is I2C based that controls some chip select 
pins for a SPI network

I also have a function that sends out I2C commands

void SendI2C(unsigned char AdresStr, CmdStr);

in calling that function is it more efficient etc to define the CmdStr 
or should I create them on the fly.

ie

_Method 1_

#define CS_SR14_on 0x01; // | 0000 0001
#define CS_SR14_of 0xFE; // & 1111 1110

or

_Method 2_

unsigned char SetCmdStr (unsigned char CmdType);
{
Switch (CmdType)
{
case 1:
          CmdStr = 0x01;
          Break;
case 2 :
          CmdStr = 0xFE;
          Break;
etc etc


Method 1 takes up lots of program room however Method 2 takes up clock 
cycles

I can see Method 1 being much better for debugging etc and if I was 
writing a Win32 app then it would be the easy choice but in the MCU 
world I am unsure so

1) Which is the better way to go
2) Why its it the best way to go

 or should I use some other method ?

-- 
Kind Regards
Grant Brown

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