xtest03_8.c

AT91sam7s 256 B/D example

/* ========================================================================== */
/*	   Xtest03_8.c : Check SLCK, MAINCK, PLLCK Clock Frequency(2)	      */
/* ========================================================================== */
/*			  Designed and programmed by Duck-Yong Yoon in 2007.  */

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

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

  LCD_string(0x80, "Check PCK1 (TP3)");		// display title

  AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, PCK1);// PCK1 output(Peripheral B) on PA17

  while(1)
    { Beep();					// check SLCK
      LCD_string(0xC0, "SLCK = 32.768kHz");
      AT91F_PMC_EnablePCK(AT91C_BASE_PMC,1,AT91C_PMC_PRES_CLK | AT91C_PMC_CSS_SLOW_CLK);
      Delay_ms(5000);

      Beep();					// check MAINCK
      LCD_string(0xC0, "MAINCK=18.432MHz");
      AT91F_PMC_EnablePCK(AT91C_BASE_PMC,1,AT91C_PMC_PRES_CLK | AT91C_PMC_CSS_MAIN_CLK);
      Delay_ms(5000);

      Beep();					// check PLLCK
      LCD_string(0xC0, "PLLCK/16 = 12MHz");
      AT91F_PMC_EnablePCK(AT91C_BASE_PMC,1,AT91C_PMC_PRES_CLK_16 | AT91C_PMC_CSS_PLL_CLK);
      Delay_ms(5000);
    }
}