serial peripheral interface

         Serial peripheral interface

   
#include <LPC21xx.H>

void spi_data(int data)
{
 IOCLR0 = (1 << 7);    // CLEARING GPIO PIN
 S0SPDR = data ;
 while(!(S0SPSR & (1 << 7))); //CHECK STATUS , MONITOR FLAG   (AFTER DATA TRANSFER THE 7TH BIT SET)
 IOSET0 = (1 << 7);
}

int main()
{
 PINSEL0 |= (1 << 8)|(1<<10)|(1 << 12); //MISO,MOSI,SCK
 PINSEL0 &= ~(1 << 9)|(1<<11)|(1 << 13); //MISO,MOSI,SCK

 IODIR0 |= (1 << 7);      //SS we are taking GPIO
 S0SPCR = (1 << 2)|(1 <<  5); //enabling the SPI and 5 bit for master mode
 S0SPCCR = 8;     //8,10,12,14 we can give given by manufacture (refer notes formula)
 while(1)
 {
 
  //7 SEGMENT DISPLAY CMDS
  spi_data(0x0C01);   // 0XC00-OFF,0XC01-ON
  spi_data(0x0900);  // decode mode (0X0900)---(Normal mode 0x0900)(can control inside the segment how may led will on
  spi_data(0x0A0F);  // OXO90F -max intencity 
  spi_data(0x0B03);  // 0x0B03 -- scan limit (how many segment on ..here we mention 3 so its on 4 segment)

  spi_data(0x0167);// DATA
  spi_data(0x023e);
  spi_data(0x034e);
  spi_data(0x0401);
 }
}