Getting Started

Chapter 10: C Structures

signed char as arguments and returning a pointer to a pwm structure.

irst Let’s redo the struct:

struct

unsigned Widt

then we rite

m m ePWM nt p , un gned ulseWidth)

ruct pwm temp;

.pulseFreq = pulseFreq;

this function we reuse the names pulseFreq and pulseWidth and cause no

e

pulser1k50 = makePWM(1000,128);//make a 50% duty 1000 kHz pulse
pulser1k25 = makePWM(1000,64);//make a 25% duty 1000 kHz pulse
puls

When of the
structure to the function. For tiny structures, this won’t matter much, but for large
structures we can eat a lot of RAM, since the entire structure will be pushed onto
the stac idth in a list of
pwm structs:

We will write a function makePWM to initialize a PWM structure by accepting an
int and an un
F

{

int pulseFreq;

pulse h;

}pwm;

w our function:

struct pw ak (i ulseFreq si char p
{
st

temp
temp.pulseWidth = pulseWidth;
return temp;
}

In
conflict because one set is bound to the struct and the other is bound to th
function.

We can use makePWM to dynamically initialize structures:

struct pwm pulser1k50;
struct pwm pulser1k25;
struct pwm pulser4k10;

er4k10 = makePWM(4000,25);//make a 10% duty 4000 kHz pulse

we use a structure as an argument in a function we send a copy

k. Let’s write a function to find the pulse with the greatest w
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