这是STM32F103超声波OLED显示实验（库函数版） -

#include "delay.h"
#include "sys.h"
#include "oled.h"
#include "bmp.h"
#include "stm32f10x_tim.h"
#include "GPIOLIKE51.h"
#define HCSR04_PORT GPIOB
#define HCSR04_CLK RCC_APB2Periph_GPIOB
#define HCSR04_TRIG GPIO_Pin_11
#define HCSR04_ECHO GPIO_Pin_10
#define TRIG_Send PBout(11)
#define ECHO_Reci PBin(10)
//?????
u16 msHcCount = 0;
//???4??
void hcsr04_NVIC()
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//IO???? ??????
void Hcsr04Init()
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(HCSR04_CLK, ENABLE);
GPIO_InitStructure.GPIO_Pin =HCSR04_TRIG;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(HCSR04_PORT, &GPIO_InitStructure);
GPIO_ResetBits(HCSR04_PORT,HCSR04_TRIG);
GPIO_InitStructure.GPIO_Pin = HCSR04_ECHO;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(HCSR04_PORT, &GPIO_InitStructure);
GPIO_ResetBits(HCSR04_PORT,HCSR04_ECHO);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_DeInit(TIM2);
TIM_TimeBaseStructure.TIM_Period = (1000-1);
TIM_TimeBaseStructure.TIM_Prescaler =(72-1);
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_ClearFlag(TIM4, TIM_FLAG_Update);
TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);
hcsr04_NVIC();
TIM_Cmd(TIM4,DISABLE);
}
//?????4
static void OpenTimerForHc()
{
TIM_SetCounter(TIM4,0);
msHcCount = 0;
TIM_Cmd(TIM4, ENABLE);
}
//?????4
static void CloseTimerForHc()
{
TIM_Cmd(TIM4, DISABLE);
}
//???4???
void TIM4_IRQHandler(void)
{
if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM4, TIM_IT_Update );
msHcCount++;
}
}
//?????4????
u32 GetEchoTimer(void)
{
u32 t = 0;
t = msHcCount*1000;
t += TIM_GetCounter(TIM4);
TIM4->CNT = 0;
delay_ms(50);
return t;
}
//?????4????????
float Hcsr04GetLength(void )
{
u32 t = 0;
int i = 0;
float lengthTemp = 0;
float sum = 0;
while(i!=5)
{
TRIG_Send = 1;
delay_us(20);
TRIG_Send = 0;
while(ECHO_Reci == 0);
OpenTimerForHc();
i = i + 1;
while(ECHO_Reci == 1);
CloseTimerForHc();
t = GetEchoTimer();
lengthTemp = ((float)t/58.0);//cm
sum = lengthTemp + sum ;
}
lengthTemp = sum/5.0;
return lengthTemp;
}
int main(void)
{ u8 t;
delay_init(); //延时函数初始化
NVIC_Configuration(); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级 LED_Init(); //LED端口初始化
Hcsr04Init();
OLED_Init(); //初始化OLED
OLED_Clear() ;
/*
OLED_ShowString(30,0,"OLED TEST");
OLED_ShowString(8,2,"ZHONGJINGYUAN");
OLED_ShowString(20,4,"2014/05/01");
OLED_ShowString(0,6,"ASCII:");
OLED_ShowString(63,6,"CODE:");
t=' ';
OLED_ShowCHinese(0,0,0);//中
OLED_ShowCHinese(18,0,1);//景
OLED_ShowCHinese(36,0,2);//园
OLED_ShowCHinese(54,0,3);//电
OLED_ShowCHinese(72,0,4);//子
OLED_ShowCHinese(90,0,5);//科
OLED_ShowCHinese(108,0,6);//技
*/
// t=' ';
OLED_Clear();
while(1)
{
// LED_ON;
t = Hcsr04GetLength();
OLED_ShowCHinese(0,0,0);//中
OLED_ShowCHinese(18,0,1);//景
OLED_ShowCHinese(36,0,2);//园
OLED_ShowCHinese(54,0,3);//电
OLED_ShowCHinese(72,0,4);//子
// OLED_ShowCHinese(90,0,5);//科
// OLED_ShowCHinese(108,0,6);//技
// OLED_ShowString(0,3,"1.3' OLED TEST");
//OLED_ShowString(8,2,"ZHONGJINGYUAN");
// OLED_ShowString(20,4,"2014/05/01");
OLED_ShowString(70,3,"CM");
// OLED_ShowString(63,6,"CODE:");
// OLED_ShowChar(48,6,t);//显示ASCII字符
// t++;
// if(t>'~')t=' ';
OLED_ShowNum(30,3,t,4,16);//显示ASCII字符的码值
//
//
delay_ms(8000);
// OLED_Clear();
// delay_ms(8000);
// // LED_OFF;
// OLED_DrawBMP(0,0,128,8,BMP1); //图片显示(图片显示慎用，生成的字表较大，会占用较多空间，FLASH空间8K以下慎用)
// delay_ms(8000);
// OLED_DrawBMP(0,0,128,8,BMP2);
// delay_ms(8000);
}
}

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