xtest11_5.c

AT91sam7s 256 B/D example

/* ========================================================================== */
/*		Xtest11_5.c : Multiple Interrupt Program by Flag	      */
/* ========================================================================== */
/*			  Designed and programmed by Duck-Yong Yoon in 2007.  */

#include "AT91SAM7S256.h"
#include "lib_AT91SAM7S256.h"
#include "OK7S256ads.h"

volatile unsigned int RTT_flag=0;		// RTT interrupt flag
volatile unsigned int TC0_flag=0;		// TC0 interrupt flag

void RTT_ISR(void)				/* RTT interrupt service routine */
{
  if(*AT91C_RTTC_RTSR & 0x0002)			// RTT RTTINC interrupt ?
    RTT_flag = 1;				// if yes, set RTT_flag
}

void TC0_ISR(void)				/* TC0 interrupt service routine */
{
  if(*AT91C_TC0_SR & 0x0010)			// TC0 CPCS interrupt ?
    TC0_flag = 1;				// if yes, set TC0_flag
}

int main(void)
{
  unsigned int LED1_status, LED2_status;	// LED1, LED2 toggle status

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

  LCD_string(0x80, "RTT(LED1) = 2 Hz");		// display title
  LCD_string(0xC0, "TC0(LED2) = 6 Hz");
  Beep();

  LED_off(LED2|LED1);				// LED2~LED1 off

  AT91F_RTTC_CfgPMC();				// initialize RTT
  AT91F_RTTRestart(AT91C_BASE_RTTC);		// clear and restart RTT
  AT91F_RTTSetPrescaler(AT91C_BASE_RTTC,16384);	// 32.768kHz/16384 = 2Hz

  AT91F_RTTSetRttIncINT(AT91C_BASE_RTTC);	// initialize RTT interrupt
  AT91F_AIC_ConfigureIt(AT91C_BASE_AIC,AT91C_ID_SYS,7,1,RTT_ISR);
  AT91F_AIC_EnableIt(AT91C_BASE_AIC,AT91C_ID_SYS);

  AT91F_TC0_CfgPMC();				// initialize TC0
  *AT91C_TC0_CMR = 0x8989C402;			// TC0 Channel Control Register
  *AT91C_TC0_CCR = 0x0005;			// TC0 clock enable and start
  *AT91C_TC0_RA = 10000;			// set TC0 register
  *AT91C_TC0_RB = 20000;
  *AT91C_TC0_RC = 62500;			// (48MHz/128/62500 = 6Hz)

  AT91F_TC_InterruptEnable(AT91C_BASE_TC0,AT91C_TC_CPCS); // initialize TC0 interrupt
  AT91F_AIC_ConfigureIt(AT91C_BASE_AIC,AT91C_ID_TC0,7,1,TC0_ISR);
  AT91F_AIC_EnableIt(AT91C_BASE_AIC,AT91C_ID_TC0);

  LED1_status = 0;
  LED2_status = 0;

  while(1)
    { if(RTT_flag == 1)				// RTT interrupt ?
        { RTT_flag = 0;				// if yes, clear flag

          LED1_status ^= 0x01;			// toggle LED1_status(2Hz/2 = 1Hz)
          if(LED1_status == 1)			// if LED1_status=1, LED1 on
            LED_on(LED1);
          else					// if LED1_status=0, LED1 off
            LED_off(LED1);
        }

      if(TC0_flag == 1)				// TC0 interrupt ?
        { TC0_flag = 0;				// if yes, clear flag

          LED2_status ^= 0x01;			// toggle LED2_status(6Hz/2 = 3Hz)
          if(LED2_status == 1)			// if LED2_status=1, LED2 on
            LED_on(LED2);
          else					// if LED2_status=0, LED2 off
            LED_off(LED2);
        }
    }
}