C code to control servos

[moaweya]

Hello everyone,
I am traying to write a programe ro control the servo movement in the C language. If any of you has an idea about this please let me know. Thank you.

 

[TiL]

What do you want to know? What are you looking for?

 

[nbucska]

yes,I do. <nbucska@pcperipherals.com>

 

[moaweya]

hey Til, how are you diong,
first of all thanks for replying to me. I want to know
thw exact commands to control the servos that are
attached to the HC11 ports. I attended to programe
these servos using interactive C but i discovered that
its not going to work. So i decided to use C language
and i spent two days researching the internet for C
commands with no luck. Can you send me these commands
please or a sample program so i can use it as a gaide.
Thank You
Moaweya

 

[TiL]

Well, I suppose you have your motor connected to a parallel port of the HC11 (let's say PORTB for this example).

You have to write to the port B with the proper value to control the proper bits in the proper order.

If you use the original configuration of the HC11, the port B is located at address 0x1004.

So, you define a 8 bit pointer variable to point to this address and you change the content of this pointer with the value you need.

function()
{
volatile char *portBPtr = (volatile char *) 0x1004;

...
*portBPtr = 0; /* Clear all bits of port B */
*portBPtr |= 0x4; /* Set bit 2 of PORT B */
*portBPtr |= 0x10; /* Set bit 4 of PORT B */
*portBPtr &= ~0x4; /* Clear bit 2 of PORT B */
*portBPtr &= ~0x10; /* Clear bit 4 of PORT B */
...
}

Hope it helps!