Thread: Sending Hex

I'm new to C programming, and I want to send a hex code(38h 00111000) to 8 pins (on a parallax propeller micro-controller) so that the first pin gets a 0 , and the next pin gets a 0 and the next pin gets a 1 , etc. This would be easier then
sending a binary code to each pin. The propeller uses low for a '0' and high for a '1'.
I hope that’s clear, sorry for my poorly worded post.
By the way this is for C code. The code I'm using so far, that works by using binary is:

Code:

//int port[] = {27,26,25,24,23,22,21,20};    
    int i = 8;
 
    while(i >0)
    {       //while start
    --i;  
    low(27);
    low(26);
    high(25);
    high(24);
    high(23);
    low(22);
    low(21);
    low(20);
    }

What I want to do is send a single hex code (38) to pins 20 to 27.
Thank you

I am unfamiliar with this device, and some quick research indicates that it does not follow the more standard conventions of microcontrollers.

Ordinarily, you would be able to assign a single value to a port, and each of the pins of that port would update according to their bit position.

For instance, on an 8-bit device:

Code:

PORTA = 0x3A;

// Port A, pin 7 = 0
// Port A, pin 6 = 0
// Port A, pin 5 = 1
// Port A, pin 4 = 1
// Port A, pin 3 = 1
// Port A, pin 2 = 0
// Port A, pin 1 = 1
// Port A, pin 0 = 0

You didn't tell us what specific device you're using, but a manual for one of the devices shows that all 32 I/O pins are grouped into a single port ("Port A"). So with the above approach, a single assignment to Port A would update all 32 I/O pins.

If you only wanted to update 8 pins at once, then the solution would be to write a simple function that receives a value and updates the pins of interest based on the value it receives. Then you can update that group of 8 pins with a single function call.

The same manual I referenced tells you where to find their discussion forums. If you're working with this device a lot, you might want to ask questions related to the specific device there, since the people there will be more familiar with this specific hardware and architecture.

Thank you for your reply.
There is only 1 propeller at this time although the prop 2 should be out within a year.
I did find the answer myself, see below

Code:

set_outputs	(23, 16, 0XF0);

All you said was correct and thank you again.