(kinetis K60)kinetis初体验之GPIO寄存器

寄存器功能

I0口初始化

PORT寄存器

一个简单的流水灯

#include "common.h"

#define LED1(a) if(a)\
                   GPIOA_PDOR &= ~(1<<10);\
else\
                   GPIOA_PDOR |= (1<<10)   


#define LED2(a) if(a)\
                   GPIOA_PDOR &= ~(1<<11);\
else\
                   GPIOA_PDOR |= (1<<11)        
#define LED3(a) if(a)\
                   GPIOA_PDOR &= ~(1<<28);\
else\
                   GPIOA_PDOR |= (1<<28) 

#define LED4(a) if(a)\
                   GPIOA_PDOR &= ~(1<<29);\
else\
                   GPIOA_PDOR |= (1<<29)    

void init_gpio(void);
void delay(long count);


void main (void)
{
  init_gpio();

  LED2(0);  
  LED3(0);

while(1)
  {
    LED4(0);   //灭
    LED1(1);   //亮
    delay(3000000);
    LED2(1);
    LED1(0);
    delay(3000000);
    LED3(1);
    LED2(0);
    delay(3000000);
    LED3(0);
    LED4(1);
    delay(3000000);
  }
}

void init_gpio()
{

  PORTA_PCR10 &= ~0x700;    //MUX 000
  PORTA_PCR10 |= PORT_PCR_MUX(1);   //MUX 001 GPIO模式
  PORTA_PCR11 &= ~0x700;
  PORTA_PCR11 |= PORT_PCR_MUX(1);  
  PORTA_PCR28 &= ~0x700;
  PORTA_PCR28 |= PORT_PCR_MUX(1);  
  PORTA_PCR29 &= ~0x700;
  PORTA_PCR29 |= PORT_PCR_MUX(1);  

  GPIOA_PDDR |= ((1<<10)|(1<<11)|(1<<28)|(1<<29));  //设置为输出
}

void delay(long count)
{
while(count--)
      asm("nop");
}