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This module is designed specifically for the Raspberry Pi IO expansion Modules,which can effectively solve the Raspberry send IO port insufficient.Module uses four 74HC595 chips to expand 32 IO ports.As shown above, the top of the module will expand the IO of Raspberry Pi again that can be cascaded for more IO expansion modules can theoretically unlimited expansion.
Code : Tout sélectionner
#include <wiringPi.h>
#include <stdio.h>
int SER = 12;
int RCLK = 10;
int SRCLK = 14;
unsigned char LED[8]={0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
void SIPO(unsigned char byte);
void pulse(int pin);
void init() {
pinMode(SER, OUTPUT);
pinMode(RCLK, OUTPUT);
pinMode(SRCLK, OUTPUT);
digitalWrite(SER, 0);
digitalWrite(SRCLK, 0);
digitalWrite(RCLK, 0);
}
void delayMS(int x) {
usleep(x * 1000);
}
int main (void)
{
if (-1 == wiringPiSetup()) {
printf("Setup wiringPi failed!");
return 1;
}
init();
int i;
while(1) {
for(i = 0; i < 8; i++)
{
SIPO(LED[i]);
pulse(RCLK);
delayMS(50);
printf(" i = %d", i);
}
printf("n");
delayMS(500); // 500 ms
for(i = 7; i >= 0; i--)
{
SIPO(LED[i]);
pulse(RCLK);
delayMS(50);
printf(" i = %d", i);
}
delayMS(500); // 500 ms
}
usleep(1000);
digitalWrite(RCLK, 1);
}
void SIPO(unsigned char byte)
{
int i;
for (i=0;i<8;i++)
{
digitalWrite(SER,((byte & (0x80 >> i)) > 0));
pulse(SRCLK);
}
}
void pulse(int pin)
{
digitalWrite(pin, 1);
digitalWrite(pin, 0);
}