Freenove Ultimate Starter Kit, Руководство пользователя

Страница: 281 / 286

281 Chapter 27 Solder Circuit Board █ www.freenove.com
support@freenove.com █
The following is the program code:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
#include <wiringPi.h>
#include <stdio.h>
#include <wiringShift.h>
#include <unistd.h>
#define dataPin 0 //DS Pin of 74HC595(Pin14)
#define latchPin 2 //ST_CP Pin of 74HC595(Pin12)
#define clockPin 3 //SH_CP Pin of 74HC595(Pin11)
//Define an array to save the pulse width of LED. Output the signal to the 8 adjacent
LEDs in order.
const int pluseWidth []={ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 64 , 32 , 16 , 8 , 4 , 2 , 1 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 };
void outData ( int8_t data ){
digitalWrite ( latchPin , LOW );
shiftOut ( dataPin , clockPin , LSBFIRST , data );
digitalWrite ( latchPin , HIGH );
}
int main ( void )
{
int i , j , index ; //index:current position in array pluseWidth
int moveSpeed = 100 ; //move speed delay, the greater, the slower
long lastMove ; //Record the last time point of the move
if ( wiringPiSetup () == - 1 ){ //when initialize wiring failed, print message to screen
printf ( "setup wiringPi failed !" );
return 1 ;
}
pinMode ( dataPin , OUTPUT );
pinMode ( latchPin , OUTPUT );
pinMode ( clockPin , OUTPUT );
index = 0 ; //Starting from the array index 0
lastMove = millis (); //the start time
while ( 1 ){
if ( millis () - lastMove > moveSpeed ) { //speed control
lastMove = millis (); //Record the time point of the move
index ++; //move to next
if ( index > 15 ) index = 0 ; //index to 0
}
for ( i = 0 ; i < 64 ; i ++){ //The cycle of PWM is 64 cycles
int8_t data = 0 ; //This loop of output data
for ( j = 0 ; j < 8 ; j ++){ //Calculate the output state of this loop
if ( i < pluseWidth [ index + j ]){ //Calculate the LED state according to
the pulse width
data |= 0x01 << j ; //Calculate the data
}