【读书笔记/学习心得+kinetis之GPIO寄存器操作】

只看该作者 · 2013-11-13 22:50

分享一个简单的流水灯程序：
#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");
}

I0口初始化

寄存器功能