xtest05_4.c

AT91sam7s 256 B/D example

/* ========================================================================== */
/*	   Xtest05_4.c : Visiting Count on GLCD using Random Number(3)	      */
/* ========================================================================== */
/*			  Designed and programmed by Duck-Yong Yoon in 2007.  */

#include <stdlib.h>
#include "AT91SAM7S256.h"
#include "lib_AT91SAM7S256.h"
#include "OK7S256ads.h"
#include "OK7S256GLCD.h"

void TWI_initialize(void)			/* initialize TWI */
{
  AT91F_TWI_CfgPIO();				// enable TWD, TWCK pin
  AT91F_PIO_Opendrain(AT91C_BASE_PIOA,AT91C_PA4_TWCK|AT91C_PA3_TWD); // open drain
  AT91F_TWI_CfgPMC();				// enable peripheral clock for TWI

  AT91F_TWI_Configure(AT91C_BASE_TWI);		// TWI master mode
  *AT91C_TWI_CWGR = 0x00023B3B;			// about 100kHz
}

void TWI_transmit(unsigned int address, unsigned int data) /* transmit by TWI */
{
  *AT91C_TWI_MMR = 0x00680100;			// master write, device address 1 byte
  *AT91C_TWI_IADR = address;			// device address
  *AT91C_TWI_CR = AT91C_TWI_MSEN|AT91C_TWI_STOP|AT91C_TWI_START; // control register
  *AT91C_TWI_THR = data;			// start transmission

  while(!(*AT91C_TWI_SR & AT91C_TWI_TXCOMP));	// complete?(TXCOMP=1)
}

unsigned int TWI_receive(unsigned int address)	/* receive by TWI */
{
  *AT91C_TWI_MMR = 0x00681100;			// master read, device address 1 byte
  *AT91C_TWI_IADR = address;			// device address
  *AT91C_TWI_CR = AT91C_TWI_MSEN|AT91C_TWI_STOP|AT91C_TWI_START; // control register

  while(!(*AT91C_TWI_SR & AT91C_TWI_TXCOMP));	// complete?(TXCOMP=1)
  return *AT91C_TWI_RHR;			// read received data and return
}

void RTC_check(void)				/* check if DS1307 RTC is OK */
{ unsigned int RTC_flag;

  RTC_flag = 0;					// initial flag

  if(TWI_receive(0x00) == 0x00)			// if second = 0x00, not OK
    RTC_flag = 1;
  else if(TWI_receive(0x00) > 0x59)		// if second > 0x59, not OK
    RTC_flag = 1;
  else if(TWI_receive(0x01) == 0x00)		// if minute = 0x00, not OK
    RTC_flag = 1;
  else if(TWI_receive(0x01) > 0x59)		// if minute > 0x59, not OK
    RTC_flag = 1;
  else if((TWI_receive(0x02) & 0x9F) == 0x00)	// if hour = 0x00, not OK
    RTC_flag = 1;
  else if((TWI_receive(0x02) & 0x40) == 0x00)
    RTC_flag = 1;
  else if((TWI_receive(0x02) & 0x9F) > 0x12)	// if hour > 0x12, not OK
    RTC_flag = 1;
  else if(TWI_receive(0x03) == 0x00)		// if week = 0x00, not OK
    RTC_flag = 1;
  else if(TWI_receive(0x03) > 0x07)		// if week > 0x07, not OK
    RTC_flag = 1;
  else if(TWI_receive(0x04) == 0x00)		// if date = 0x00, not OK
    RTC_flag = 1;
  else if(TWI_receive(0x04) > 0x31)		// if date > 0x31, not OK
    RTC_flag = 1;
  else if(TWI_receive(0x05) == 0x00)		// if month = 0x00, not OK
    RTC_flag = 1;
  else if(TWI_receive(0x05) > 0x12)		// if month > 0x12, not OK
    RTC_flag = 1;
  else if(TWI_receive(0x06) > 0x99)		// if year > 0x99, not OK
    RTC_flag = 1;

  if(RTC_flag != 0)
    { TWI_transmit(0x00, 0x00);			// innitialize DS1307 RTC
      TWI_transmit(0x01, 0x00);			// (2007/06/01 FRI 12:00:00 AM)
      TWI_transmit(0x02, 0x12 | 0x40);
      TWI_transmit(0x03, 0x06);
      TWI_transmit(0x04, 0x01);
      TWI_transmit(0x05, 0x06);
      TWI_transmit(0x06, 0x07);
      TWI_transmit(0x07, 0x00);			// (control register = 0x00)
    }
}

int main(void)
{
  unsigned int i, j, seed, random, x, y, visit_flag;

  MCU_initialize();				// initialize AT91SAM7S256 & kit
  Delay_ms(50);					// wait for system stabilization
  LCD_initialize();				// initialize text LCD
  GLCD_clear();		               		// initialize GLCD screen

  LCD_string(0x80,"Graphic LCD Test");          // display title on text LCD
  LCD_string(0xC0," Visiting Count ");
  Beep();

  Clear_screen();				// clear visiting room
  visit_flag = 0;
  x = 32;					// starting position
  y = 64;

  TWI_initialize();				// initialize TWI
  RTC_check();					// check the status of DS1307 RTC

  seed = TWI_receive(0x02) << 16;		// make seed of random number
  seed += (TWI_receive(0x01) << 8);		// (seed = hour / minute / second)
  seed += TWI_receive(0x00);
  srand(seed);			               	// initialize random number

  while(visit_flag == 0)
    { random = rand();				// get random number

      if(random <= 0x1FFFFFFF)			// 0x00000000 - 0x1FFFFFFF
        { if(y == 127) y = 0;
          else         y++;
          Dot(x,y); }
      else if(random <= 0x3FFFFFFF)		// 0x20000000 - 0x3FFFFFFF
        { if(y == 0)  y = 127;
          else        y--;
          Dot(x,y); }
      else if(random <= 0x5FFFFFFF)		// 0x40000000 - 0x5FFFFFFF
        { if(x == 63)  x = 0;
          else         x++;
          Dot(x,y); }
      else					// 0x60000000 - 0x7FFFFFFF
        { if(x == 0)  x = 63;
          else        x--;
          Dot(x,y); }

      Delay_ms(1);

      visit_flag = 1;				// check end
      for(i = 0; i <= 7; i++)
        for(j = 0; j <= 127; j++)
          if(screen[i][j] != 0xFF)
            visit_flag = 0;
    }

  Beep();                                       // OK sound
  LCD_string(0xC0,"  Visiting OK!  ");		// OK message
  while(1);
}