system.c

at91sam7s64的IO控制

#include "system.h"
#include "AT91SAM7S64.h"

extern void Delay_s (unsigned long a);

AT91PS_PMC pPMC   = AT91C_BASE_PMC;

// 定义主要指针
AT91PS_PIO    p_pPio   = AT91C_BASE_PIOA;
AT91PS_PMC    p_pPMC   = AT91C_BASE_PMC;
AT91PS_USART  p_pUSART = AT91C_BASE_US0;
AT91PS_PDC    p_pPDC   = AT91C_BASE_PDC_US0;
AT91PS_MC     p_pMC    = AT91C_BASE_MC;
AT91PS_AIC    p_pAic   = AT91C_BASE_AIC;

void InitFrec(void) { // 主频初始化函数
AT91C_BASE_WDTC->WDTC_WDMR= AT91C_WDTC_WDDIS;    // 禁止看门狗
  pPMC->PMC_MOR = (( AT91C_CKGR_OSCOUNT & (0x06 <<8) | AT91C_CKGR_MOSCEN ));  // 允许主振荡器
  while(!(pPMC->PMC_SR & AT91C_PMC_MOSCS));  // 等待启动
  pPMC->PMC_PLLR = ((AT91C_CKGR_DIV & 3) | (AT91C_CKGR_PLLCOUNT & (28<<8)) | (AT91C_CKGR_MUL & (24<<16)));  // 设置 PLL 及 除法器
  while(!(pPMC->PMC_SR & AT91C_PMC_LOCK));  // 等待启动
  while(!(pPMC->PMC_SR & AT91C_PMC_MCKRDY));
  pPMC->PMC_MCKR = AT91C_PMC_CSS_PLL_CLK | AT91C_PMC_PRES_CLK_2;  // 选择主时钟和处理器时钟，PLL时钟/2
  while(!(pPMC->PMC_SR & AT91C_PMC_MCKRDY));
}


void InitPeriphery(void) { // 外围初始化函数
  p_pPMC->PMC_PCER = 1 << AT91C_ID_PIOA;    // 允许PIO时钟
  /*p_pPio->PIO_PER |= BIT0;  // 配置PA0为输出->LED1
  p_pPio->PIO_OER |= BIT0;   
  p_pPio->PIO_SODR |= BIT0;*/

  p_pPio->PIO_PER |= BIT1;  // 配置PA1为输出->LED2
  p_pPio->PIO_OER |= BIT1;  
  p_pPio->PIO_SODR |= BIT1;

 /* p_pPio->PIO_PER |= BIT2;  // 配置PA2为输出->LED3
  p_pPio->PIO_OER |= BIT2; 
  p_pPio->PIO_SODR |= BIT2;

  p_pPio->PIO_PER |= BIT3;  // 配置PA3为输出->LED4
  p_pPio->PIO_OER |= BIT3;  
  p_pPio->PIO_SODR |= BIT3;*/
}