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user:ccornair:portfolio:datacomm3 [2013/11/06 15:48] – created ccornairuser:ccornair:portfolio:datacomm3 [2013/12/13 03:41] (current) – ccornair
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 +====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====
 +
 +<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;
 +}
 +
 +</code>
 +
 +====Reflection====
 +even though this was a cheesy counter program it was really neat to see the counter work!!

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