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Table of Contents
Objectives
To build a binary counter using LEDs and a raspberry pi
Prerequisites
raspberry pie,monitor, keyboard, data cable, hdmi to usb cable, network cable
Background
The Raspberry Pi is a credit-card-sized single-board computer developed in the UK by the Raspberry Pi Foundation with the intention of promoting the teaching of basic computer science in schools.[7][8][9][10][11]
The Raspberry Pi is manufactured through licensed manufacturing deals with Newark element14 (Premier Farnell), RS Components and Egoman. All of these companies sell the Raspberry Pi online.[12] Egoman produces a version for distribution solely in China and Taiwan, which can be distinguished from other Pis by their red coloring and lack of FCC/CE marks. The hardware is the same across all manufacturers.
Code
#include "rpi.h"
void clear()
{
GPIO_CLR = 1 << 7;
GPIO_CLR = 1 << 8;
GPIO_CLR = 1 << 9;
GPIO_CLR = 1 << 10;
sleep(1);
}
int main()
{
if(map_peripheral(&gpio) == -1)
{
printf("Failed to map the physical GPIO registers into the virtual memory space.\n");
return -1;
}
int count = 0;
// Define pin 7 as output
INP_GPIO(7);
OUT_GPIO(7);
INP_GPIO(8);
OUT_GPIO(8);
INP_GPIO(9);
OUT_GPIO(9);
INP_GPIO(10);
OUT_GPIO(10);
// Toggle pin 7 (blink a led!)
//15
GPIO_SET = 1 << 7;
GPIO_SET = 1 << 8;
GPIO_SET = 1 << 9;
GPIO_SET = 1 << 10;
sleep(2);
clear();
//14
GPIO_SET = 1 << 7;
GPIO_SET = 1 << 8;
GPIO_SET = 1 << 9;
GPIO_SET = 0 << 10;
sleep(2);
clear();
//13
GPIO_SET = 1 << 7;
GPIO_SET = 1 << 8;
GPIO_SET = 0 << 9;
GPIO_SET = 1 << 10;
sleep(2);
clear();
GPIO_SET = 1 << 7;
GPIO_SET = 1 << 8;
GPIO_SET = 0 << 9;
GPIO_SET = 0 << 10;
sleep(2);
clear();
GPIO_SET = 1 << 7;
GPIO_SET = 0 << 8;
GPIO_SET = 1 << 9;
GPIO_SET = 1 << 10;
sleep(2);
clear();
GPIO_SET = 1 << 7;
GPIO_SET = 0 << 8;
GPIO_SET = 1 << 9;
GPIO_SET = 0 << 10;
sleep(2);
clear();
GPIO_SET = 1 << 7;
GPIO_SET = 0 << 8;
GPIO_SET = 0 << 9;
GPIO_SET = 1 << 10;
sleep(2);
clear();
GPIO_SET = 1 << 7;
GPIO_SET = 0 << 8;
GPIO_SET = 0 << 9;
GPIO_SET = 0 << 10;
sleep(2);
clear();
GPIO_SET = 0 << 7;
GPIO_SET = 1 << 8;
GPIO_SET = 1 << 9;
GPIO_SET = 1 << 10;
sleep(2);
clear();
GPIO_SET = 0 << 7;
GPIO_SET = 1 << 8;
GPIO_SET = 1 << 9;
GPIO_SET = 0 << 10;
sleep(2);
clear();
GPIO_SET = 0 << 7;
GPIO_SET = 1 << 8;
GPIO_SET = 0 << 9;
GPIO_SET = 1 << 10;
sleep(2);
clear();
GPIO_SET = 0 << 7;
GPIO_SET = 1 << 8;
GPIO_SET = 0 << 9;
GPIO_SET = 0 << 10;
sleep(2);
clear();
GPIO_SET = 0 << 7;
GPIO_SET = 0 << 8;
GPIO_SET = 1 << 9;
GPIO_SET = 1 << 10;
sleep(2);
clear();
GPIO_SET = 0 << 7;
GPIO_SET = 0 << 8;
GPIO_SET = 1 << 9;
GPIO_SET = 0 << 10;
sleep(2);
clear();
GPIO_SET = 0 << 7;
GPIO_SET = 0 << 8;
GPIO_SET = 0 << 9;
GPIO_SET = 1 << 10;
sleep(2);
clear();
GPIO_SET = 0 << 7;
GPIO_SET = 0 << 8;
GPIO_SET = 0 << 9;
GPIO_SET = 0 << 10;
sleep(2);
clear();
return 0;
}
Reflection
even though this was a cheesy counter program it was really neat to see the counter work!!
