帮我写一个基于stm32控制步进电机的代码

好的，我可以回答这个问题。以下是一个基于stm32控制步进电机的代码示例：

#include "stm32f10x.h"

#define STEPPER_PORT GPIOA
#define STEPPER_PIN1 GPIO_Pin_
#define STEPPER_PIN2 GPIO_Pin_1
#define STEPPER_PIN3 GPIO_Pin_2
#define STEPPER_PIN4 GPIO_Pin_3

void delay(uint32_t time)
{
while(time--);
}

void stepper_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = STEPPER_PIN1 | STEPPER_PIN2 | STEPPER_PIN3 | STEPPER_PIN4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(STEPPER_PORT, &GPIO_InitStructure);
}

void stepper_step(uint8_t step)
{
switch(step)
{
case :
GPIO_Write(STEPPER_PORT, STEPPER_PIN1 | STEPPER_PIN2 | STEPPER_PIN3 | STEPPER_PIN4);
break;
case 1:
GPIO_Write(STEPPER_PORT, STEPPER_PIN2 | STEPPER_PIN3 | STEPPER_PIN4);
break;
case 2:
GPIO_Write(STEPPER_PORT, STEPPER_PIN1 | STEPPER_PIN3 | STEPPER_PIN4);
break;
case 3:
GPIO_Write(STEPPER_PORT, STEPPER_PIN3 | STEPPER_PIN4);
break;
case 4:
GPIO_Write(STEPPER_PORT, STEPPER_PIN1 | STEPPER_PIN2 | STEPPER_PIN4);
break;
case 5:
GPIO_Write(STEPPER_PORT, STEPPER_PIN2 | STEPPER_PIN4);
break;
case 6:
GPIO_Write(STEPPER_PORT, STEPPER_PIN1 | STEPPER_PIN4);
break;
case 7:
GPIO_Write(STEPPER_PORT, STEPPER_PIN4);
break;
}
}

int main(void)
{
uint8_t i;

stepper_init();

while(1)
{
for(i = ; i < 8; i++)
{
stepper_step(i);
delay(10000);
}
}
}