lpc1788控制步进电机28BYJ-48

下面直接上代码：

#include "lpc177x_8x.h"

#include "lpc177x_8x_clkpwr.h"

#include "lpc177x_8x_gpio.h"

#include "debug_frmwrk.h"

#include "led.h"



volatile uint32_t cycleCounter;

void DelayMs(uint32_t delay)

{

  uint32_t startTime = cycleCounter;



  while ((uint32_t)(cycleCounter - startTime) <= delay);

}

void SysTick_Handler(void) //SysTick handler sub-routine (1ms) 

{

  cycleCounter++;

}



uint32_t a[8]={0xFF8FFFFF,0xFFCFFFFF,0xFF4FFFFF,0xFF6FFFFF,0xFF2FFFFF,0xFF3FFFFF,0xFF1FFFFF,0xFF9FFFFF};

	

int main(void)

{

	SysTick_Config(CLKPWR_GetCLK(CLKPWR_CLKTYPE_CPU) / 1000);



	GPIO_Init();//ʹÄÜGPIO¿ÚµÄʱÖÓ

	GPIO_SetDir(4,1<<20, GPIO_DIRECTION_OUTPUT);

	GPIO_SetDir(4,1<<21, GPIO_DIRECTION_OUTPUT);

	GPIO_SetDir(4,1<<22, GPIO_DIRECTION_OUTPUT);

	GPIO_SetDir(4,1<<23, GPIO_DIRECTION_OUTPUT);



	while(1)

	{

		 GPIO_SetValue(4, a[0]);

		 DelayMs(1);

		 GPIO_ClearValue(4,0xFFFFFFFF);

		 

		 GPIO_SetValue(4, a[1]);

                   DelayMs(1);

		 GPIO_ClearValue(4,0xFFFFFFFF);

		

		 GPIO_SetValue(4, a[2]);

                   DelayMs(1);

		 GPIO_ClearValue(4,0xFFFFFFFF);

		

	          GPIO_SetValue(4, a[3]);

                   DelayMs(1);

		 GPIO_ClearValue(4,0xFFFFFFFF);

		

		 GPIO_SetValue(4, a[4]);

                   DelayMs(1);

		 GPIO_ClearValue(4,0xFFFFFFFF);

		

		 GPIO_SetValue(4, a[5]);

                    DelayMs(1);

		 GPIO_ClearValue(4,0xFFFFFFFF);

		 

		 GPIO_SetValue(4, a[6]);

                    DelayMs(1);

		 GPIO_ClearValue(4,0xFFFFFFFF);

		 

		 GPIO_SetValue(4, a[7]);

                   DelayMs(1);

		 GPIO_ClearValue(4,0xFFFFFFFF);

  }

}

 其中GPIO_ClearValue(4,0xFFFFFFFF);这句代码非常重要。 因为如果有些位不清零的话，下次setvalue某些位为0是不行的，setvalue只能设置1.