xtest12_1.c

AT91sam7s 256 B/D example

/* ========================================================================== */
/*		Xtest12_1.c : Constant PWM0, PWM1 Output		      */
/* ========================================================================== */
/*			  Designed and programmed by Duck-Yong Yoon in 2007.  */

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

__inline void AT91F_PWMC_CfgMode(
        AT91PS_PWMC pPWM,			// pointer to a PWM controller
        unsigned int mode)			// PWM_MR register value
{
	pPWM->PWMC_MR = mode;
}

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

  LCD_string(0x80,"PWM0 = 2kHz, 25%");		// display title
  LCD_string(0xC0,"PWM1 = 1kHz, 50%");
  Beep();

  AT91F_PWMC_CfgPMC();				// enable clock of PWMC
  AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, AT91C_PA1_PWM1 | AT91C_PA0_PWM0, 0);
  						// PWM1,PWM0 output(Peripheral A)

  AT91F_PWMC_CfgMode(AT91C_BASE_PWMC, 0x031E031E); // CLKA=CLKB = 48MHz/8/30 = 200kHz
  AT91F_PWMC_CfgChannel(AT91C_BASE_PWMC, 0, 0x020B, 100, 25);  // CLKA/100 = 2kHz
  AT91F_PWMC_CfgChannel(AT91C_BASE_PWMC, 1, 0x020B, 200, 100); // CLKA/200 = 1kHz
  AT91F_PWMC_StartChannel(AT91C_BASE_PWMC, AT91C_PWMC_CHID1 | AT91C_PWMC_CHID0);
						// start PWM1 and PWM0

  while(1);					// infinite loop
}