目录
一、硬件清单
1、主控STM32F103C8T6
2、L9110S电机模块
3、超声波模块
4、sg90舵机模块
5、oled屏
6、测速模块
7、红外模块
8、esp8266模块(wifi模块)
9、语音模块
10、循迹模块
二、功能实现
左右转与前进后退:通过控制左组轮和右组轮的配合实现。pwm调速使其更平滑
循迹功能:基于光电传感器原理,通过判断黑线和白线来决定左转或者右转
跟随功能:通过超声波测出小车和跟随物的距离决定移动方向
避障功能:通过超声波检测出前方障碍物,做出改变方向的决定
语音模块控制:多种语音改变多种引脚的电平,通过语音控制实现以上多种功能的切换
old屏显示速度:将测速模块的数据通过oled屏显示
远程控制:支持蓝牙、4g以及WiFi控制小车
三、相关代码
1、让小车动起来
IA1输入高电平,IA1输入低电平,【OA1 OB1】电机正转;
IA1输入低电平,IA1输入高电平,【OA1 OB1】电机反转;
IA2输入高电平,IA2输入低电平,【OA2 OB2】电机正转;
IA2输入低电平,IA2输入高电平,【OA2 OB2】电机反转;
motor.c
#include "motor.h"
void goForward(void)
{
// 左轮
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_2, GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_10, GPIO_PIN_RESET);
// 右轮
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_1, GPIO_PIN_RESET);
}
void goBack(void)
{
// 左轮
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_2, GPIO_PIN_RESET);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_10, GPIO_PIN_SET);
// 右轮
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_RESET);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_1, GPIO_PIN_SET);
}
void goLeft(void)
{
// 左轮
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_2, GPIO_PIN_RESET);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_10, GPIO_PIN_RESET);
// 右轮
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_1, GPIO_PIN_RESET);
}
void goRight(void)
{
// 左轮
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_2, GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_10, GPIO_PIN_RESET);
// 右轮
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_RESET);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_1, GPIO_PIN_RESET);
}
void stop(void)
{
// 左轮
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_2, GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_10, GPIO_PIN_SET);
// 右轮
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_RESET);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_1, GPIO_PIN_RESET);
}
motot.h
#ifndef __MOTOR_H__
#define __MOTOR_H__
#include "main.h"
void goForward(void);
void goBack(void);
void goLeft(void);
void goRight(void);
void stop(void);
#endif
main.c
#include "motor.h"
//main函数的while循环部分:
while (1)
{
goForward();
HAL_Delay(1000);
goBack();
HAL_Delay(1000);
goLeft();
HAL_Delay(1000);
goRight();
HAL_Delay(1000);
stop();
HAL_Delay(1000);
}
2、串口控制小车方向
usart.c(在工程配置的usart.c中添加以下代码)
#include "string.h"
#include "stdio.h"
#include "motor.h"
//串口接收缓存(1字节)
uint8_t buf=0;
//定义最大接收字节数 200,可根据需求调整
#define UART1_REC_LEN 200
// 接收缓冲, 串口接收到的数据放在这个数组里,最大UART1_REC_LEN个字节
uint8_t UART1_RX_Buffer[UART1_REC_LEN];
// 接收状态
// bit15, 接收完成标志
// bit14, 接收到0x0d
// bit13~0, 接收到的有效字节数目
uint16_t UART1_RX_STA=0;
#define SIZE 12
char buffer[SIZE];
// 接收完成回调函数,收到一个数据后,在这里处理
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
//判断中断由哪个串口触发
if(huart->Instance == USART1)
{
//判断接收是否完成(UART1_RX_STA bit15 位是否为1)
if((UART1_RX_STA & 0x8000) == 0)
{
//如果已经收到了 0x0d (回车),
if(UART1_RX_STA & 0x4000)
{
//判断是否收到 0x0a (换行)
if(buf == 0x0a)
{
//如果 0x0a和0x0d都收到,则将bit15位置为1
UART1_RX_STA |= 0x8000;
//车控指令
if(!strcmp(UART1_RX_Buffer, "M1"))
goForward();
else if(!strcmp(UART1_RX_Buffer, "M2"))
goBack();
else if(!strcmp(UART1_RX_Buffer, "M3"))
goLeft();
else if(!strcmp(UART1_RX_Buffer, "M4"))
goRight();
else
stop();
memset(UART1_RX_Buffer, 0, UART1_REC_LEN);
UART1_RX_STA = 0;
}
else
//否则认为接收错误,重新开始
UART1_RX_STA = 0;
}
else // 如果没有收到了 0x0d (回车)
{
//则先判断收到的这个字符是否是 0x0d (回车)
if(buf == 0x0d)
{
//是的话则将 bit14 位置为1
UART1_RX_STA |= 0x4000;
}
else
{
//否则将接收到的数据保存在缓存数组里
UART1_RX_Buffer[UART1_RX_STA & 0X3FFF] = buf;
UART1_RX_STA++;
//如果接收数据大于UART1_REC_LEN(200字节),则重新开始接收
if(UART1_RX_STA > UART1_REC_LEN - 1)
UART1_RX_STA = 0;
}
}
}
//重新开启中断
HAL_UART_Receive_IT(&huart1, &buf, 1);
}
}
int fputc(int ch, FILE *f)
{
unsigned char temp[1]={ch};
HAL_UART_Transmit(&huart1,temp,1,0xffff);
return ch;
}
注:主函数main.c中需要将中断打开,同时在点开魔术棒将u8勾上 如下:
#include "motor.h"
extern uint8_t buf;
//main函数
HAL_UART_Receive_IT(&huart1, &buf, 1);
3、串口点动控制小车
在usart.c车控指令处进行修改 如下:
if (!strcmp(UART1_RX_Buffer, "M1"))
{
goForward();
HAL_Delay(10);
}
else if (!strcmp(UART1_RX_Buffer, "M2"))
{
goBack();
HAL_Delay(10);
}
else if (!strcmp(UART1_RX_Buffer, "M3"))
{
goLeft();
HAL_Delay(10);
}
else if (!strcmp(UART1_RX_Buffer, "M4"))
{
goRight();
HAL_Delay(10);
}
else
stop();
注:这里的HAL_Delay函数为滴答定时器 若直接如上修改代码 则在串口助手中发出车控指令时会导致程序阻塞 有以下两种解决方法:
1.在主函数中调用以下函数修改滴答定时器优先级
HAL_NVIC_SetPriority(Systick_IRQn,0,0);
2.通过Cubemx配置滴答定时器优先级
4、硬件PWM调速控制小车前进
main.c
// main函数里
HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_1);
HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_2);
while (1)
{
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_1, 8);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_2, 8);
HAL_Delay(1000);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_1, 10);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_2, 10);
HAL_Delay(1000);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_1, 15);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_2, 15);
HAL_Delay(1000);
}
注意:此时小车轮子并不能正常改变转动速度转动,原因是L9110电机模块每个控制口需要一高一低才可以动起来,如果PWM有效电平为高电平,则另一个 GPIO口则需要输出低电平才可以驱动轮子,解决方法是将电机模块对应的GPIO口设置低电平驱动即可
5、硬件PWM调速控制小车左右转
main.c
// main函数里
while (1)
{
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_1,8);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_2,15);
HAL_Delay(1000);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_1,15);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_2,8);
HAL_Delay(1000);
}
6、循迹小车
循迹原理
1.左右循迹模块都照射到白色上——红外返回——都输出低电平——指示灯亮——直走
2.左循迹模块照射到黑色跑道上——左边红外被吸收不返回——左边输出高电平——指示灯灭——需要左转
3.右循迹模块照射到黑色跑道上——右边红外被吸收不返回——右边输出高电平——指示灯灭——需要右转
这里循迹模块是一个传感器,需要获取传感器的值进行相应操作,所以Cubemx中需配置传感器对应引脚为输入模式,如下:
相关代码
main.c
#define LeftWheel_Value HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_3)
#define RightWheel_Value HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_4)
// main函数里
while (1)
{
if (LeftWheel_Value == GPIO_PIN_RESET && RightWheel_Value == GPIO_PIN_RESET)
goForward();
if (LeftWheel_Value == GPIO_PIN_SET && RightWheel_Value == GPIO_PIN_RESET)
goLeft();
if (LeftWheel_Value == GPIO_PIN_RESET && RightWheel_Value == GPIO_PIN_SET)
goRight();
if (LeftWheel_Value == GPIO_PIN_SET && RightWheel_Value == GPIO_PIN_SET)
stop();
}
7、解决平滑转弯问题
#define LeftWheel_Value HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_3)
#define RightWheel_Value HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_4)
// main函数里
while (1)
{
if(LeftWheel_Value == GPIO_PIN_RESET && RightWheel_Value == GPIO_PIN_RESET)
{
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_1,19);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_2,19);
}
if(LeftWheel_Value == GPIO_PIN_SET && RightWheel_Value == GPIO_PIN_RESET)
{
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_1,15);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_2,8);
}
if(LeftWheel_Value == GPIO_PIN_RESET && RightWheel_Value == GPIO_PIN_SET)
{
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_1,8);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_2,15);
}
if(LeftWheel_Value == GPIO_PIN_SET && RightWheel_Value == GPIO_PIN_SET)
{
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_1,0);
__HAL_TIM_SetCompare(&htim2, TIM_CHANNEL_2,0);
}
}
8.跟随/避障小车
原理:
- 左边跟随模块能返回红外,输出低电平,右边不能返回,输出高电平,说明物体在左边,需要左转
- 右边跟随模块能返回红外,输出低电平,左边不能返回,输出高电平,说明物体在右边,需要右转
相关代码
main.c
#define LeftWheel_Value HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_5)
#define RightWheel_Value HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_6)
// main函数里
while (1)
{
if(LeftWheel_Value == GPIO_PIN_RESET && RightWheel_Value == GPIO_PIN_RESET)
goForward();
if(LeftWheel_Value == GPIO_PIN_SET && RightWheel_Value == GPIO_PIN_RESET)
goRight();
if(LeftWheel_Value == GPIO_PIN_RESET && RightWheel_Value == GPIO_PIN_SET)
goLeft();
if(LeftWheel_Value == GPIO_PIN_SET && RightWheel_Value == GPIO_PIN_SET)
stop();
}
9、摇头避障小车
9.1 封装摇头功能
Cubemx配置
上图的预分频值和重装值通过公式代入得出,这里设置周期为20ms,公式如下:
如果周期为20ms,则 PSC=7199,ARR=199。
sg90模块角度控制:
0.5ms-------------0度; 2.5% 对应函数中CCRx为5
1.0ms------------45度; 5.0% 对应函数中CCRx为10
1.5ms------------90度; 7.5% 对应函数中CCRx为15(这里经过调试发现17比较接近于90°)
2.0ms-----------135度; 10.0% 对应函数中CCRx为20
2.5ms-----------180度; 12.5% 对应函数中CCRx为25
相关代码
sg90.c
#include "sg90.h"
#include "gpio.h"
#include "tim.h"
void initSG90(void)//初始化90度
{
HAL_TIM_PWM_Start(&htim4,TIM_CHANNEL_4); //启动定时器4
__HAL_TIM_SetCompare(&htim4, TIM_CHANNEL_4, 17); //将舵机置为90度
}
void sgMiddle(void)
{
__HAL_TIM_SetCompare(&htim4, TIM_CHANNEL_4, 17); //将舵机置为90度
}
void sgRight(void)
{
__HAL_TIM_SetCompare(&htim4, TIM_CHANNEL_4, 5); //将舵机置为0度
}
void sgLeft(void)
{
__HAL_TIM_SetCompare(&htim4, TIM_CHANNEL_4, 25); //将舵机置为180度
}
sg90.h
#ifndef __SG90_H__
#define __SG90_H__
void initSG90(void);
void sgMiddle(void);
void sgRight(void);
void sgLeft(void);
#endif
main.c
#define LeftWheel_Value HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_5)
#define RightWheel_Value HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_6)
// main函数里
while (1)
{
if(LeftWheel_Value == GPIO_PIN_RESET && RightWheel_Value == GPIO_PIN_RESET)
goForward();
if(LeftWheel_Value == GPIO_PIN_SET && RightWheel_Value == GPIO_PIN_RESET)
goRight();
if(LeftWheel_Value == GPIO_PIN_RESET && RightWheel_Value == GPIO_PIN_SET)
goLeft();
if(LeftWheel_Value == GPIO_PIN_SET && RightWheel_Value == GPIO_PIN_SET)
stop();
}
9.2 封装超声波传感器
Cubrmx配置
sr04.c
#include "sr04.h"
#include "gpio.h"
#include "tim.h"
//使用TIM2来做us级延时函数
void TIM2_Delay_us(uint16_t n_us)
{
/* 使能定时器2计数 */
__HAL_TIM_ENABLE(&htim2);
__HAL_TIM_SetCounter(&htim2, 0);
while(__HAL_TIM_GetCounter(&htim2) < ((1 * n_us)-1) );
/* 关闭定时器2计数 */
__HAL_TIM_DISABLE(&htim2);
}
double get_distance(void)
{
int cnt=0;
//1. Trig ,给Trig端口至少10us的高电平
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_SET);//拉高
TIM2_Delay_us(20);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_RESET);//拉低
//2. echo由低电平跳转到高电平,表示开始发送波
//波发出去的那一下,开始启动定时器
while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_8) == GPIO_PIN_RESET);//等待输入电平拉高
HAL_TIM_Base_Start(&htim2);
__HAL_TIM_SetCounter(&htim2,0);
//3. 由高电平跳转回低电平,表示波回来了
while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_8) == GPIO_PIN_SET);//等待输入电平变低
//波回来的那一下,我们开始停止定时器
HAL_TIM_Base_Stop(&htim2);
//4. 计算出中间经过多少时间
cnt = __HAL_TIM_GetCounter(&htim2);
//5. 距离 = 速度 (340m/s)* 时间/2(计数1次表示1us)
return (cnt*340/2*0.000001*100); //单位:cm
}
sr04.h
#ifndef __SR04_H__
#define __SR04_H__
double get_distance(void);
#endif
main.c
#define MIDDLE 0
#define LEFT 1
#define RIGHT 2
char dir;
double disMiddle;
double disLeft;
double disRight;
while (1)
{
if(dir != MIDDLE){
sgMiddle();
dir = MIDDLE;
HAL_Delay(300);
}
disMiddle = get_distance();
if(disMiddle > 35){
//前进
}
else
{
//停止
//测左边距离
sgLeft();
HAL_Delay(300);
disLeft = get_distance();
sgMiddle();
HAL_Delay(300);
sgRight();
dir = RIGHT;
HAL_Delay(300);
disRight = get_distance();
}
}
9.3 封装电机驱动
while (1)
{
if(dir != MIDDLE){
sgMiddle();
dir = MIDDLE;
HAL_Delay(300);
}
disMiddle = get_distance();
if(disMiddle > 35){
//前进
goForward();
}else if(disMiddle < 10){
goBack();
}else
{
//停止
stop();
//测左边距离
sgLeft();
HAL_Delay(300);
disLeft = get_distance();
sgMiddle();
HAL_Delay(300);
sgRight();
dir = RIGHT;
HAL_Delay(300);
disRight = get_distance();
if(disLeft < disRight){
goRight();
HAL_Delay(150);
stop();
}
if(disRight < disLeft){
goLeft();
HAL_Delay(150);
stop();
}
}
HAL_Delay(50);
}
10、小车测速数据通过串口上传到上位机
Cubemx配置
main.c
//中断定时服务函数
unsigned int speedCnt;
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if (GPIO_Pin == GPIO_PIN_14)
if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_14) == GPIO_PIN_RESET)
speedCnt++;
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
printf("speed: %d\r\n", speedCnt);
speedCnt = 0;
}
main函数里:
HAL_TIM_Base_Start_IT(&htim2);
11、串口控制小车并使用Oled屏显示速度
oled.c
#include "oled.h"
#include "i2c.h"
#include "oledfont.h"
void Oled_Write_Cmd(uint8_t dataCmd)
{
HAL_I2C_Mem_Write(&hi2c1, 0x78, 0x00, I2C_MEMADD_SIZE_8BIT,
&dataCmd, 1, 0xff);
}
void Oled_Write_Data(uint8_t dataData)
{
HAL_I2C_Mem_Write(&hi2c1, 0x78, 0x40, I2C_MEMADD_SIZE_8BIT,
&dataData, 1, 0xff);
}
void Oled_Init(void){
Oled_Write_Cmd(0xAE);//--display off
Oled_Write_Cmd(0x00);//---set low column address
Oled_Write_Cmd(0x10);//---set high column address
Oled_Write_Cmd(0x40);//--set start line address
Oled_Write_Cmd(0xB0);//--set page address
Oled_Write_Cmd(0x81); // contract control
Oled_Write_Cmd(0xFF);//--128
Oled_Write_Cmd(0xA1);//set segment remap
Oled_Write_Cmd(0xA6);//--normal / reverse
Oled_Write_Cmd(0xA8);//--set multiplex ratio(1 to 64)
Oled_Write_Cmd(0x3F);//--1/32 duty
Oled_Write_Cmd(0xC8);//Com scan direction
Oled_Write_Cmd(0xD3);//-set display offset
Oled_Write_Cmd(0x00);//
Oled_Write_Cmd(0xD5);//set osc division
Oled_Write_Cmd(0x80);//
Oled_Write_Cmd(0xD8);//set area color mode off
Oled_Write_Cmd(0x05);//
Oled_Write_Cmd(0xD9);//Set Pre-Charge Period
Oled_Write_Cmd(0xF1);//
Oled_Write_Cmd(0xDA);//set com pin configuartion
Oled_Write_Cmd(0x12);//
Oled_Write_Cmd(0xDB);//set Vcomh
Oled_Write_Cmd(0x30);//
Oled_Write_Cmd(0x8D);//set charge pump enable
Oled_Write_Cmd(0x14);//
Oled_Write_Cmd(0xAF);//--turn on oled panel
}
void Oled_Screen_Clear(void){
char i,n;
Oled_Write_Cmd (0x20); //set memory addressing mode
Oled_Write_Cmd (0x02); //page addressing mode
for(i=0;i<8;i++){
Oled_Write_Cmd(0xb0+i); //éè??ò3μ??·£¨0~7£?
Oled_Write_Cmd(0x00); //éè????ê??????aáDμíμ??·
Oled_Write_Cmd(0x10); //éè????ê??????aáD??μ??·
for(n=0;n<128;n++)Oled_Write_Data(0x00);
}
}
void Oled_Show_Char(char row,char col,char oledChar){ //row*2-2
unsigned int i;
Oled_Write_Cmd(0xb0+(row*2-2)); //page 0
Oled_Write_Cmd(0x00+(col&0x0f)); //low
Oled_Write_Cmd(0x10+(col>>4)); //high
for(i=((oledChar-32)*16);i<((oledChar-32)*16+8);i++){
Oled_Write_Data(F8X16[i]); //写数据oledTable1
}
Oled_Write_Cmd(0xb0+(row*2-1)); //page 1
Oled_Write_Cmd(0x00+(col&0x0f)); //low
Oled_Write_Cmd(0x10+(col>>4)); //high
for(i=((oledChar-32)*16+8);i<((oledChar-32)*16+8+8);i++){
Oled_Write_Data(F8X16[i]); //写数据oledTable1
}
}
/******************************************************************************/
// 函数名称:Oled_Show_Char
// 输入参数:oledChar
// 输出参数:无
// 函数功能:OLED显示单个字符
/******************************************************************************/
void Oled_Show_Str(char row,char col,char *str){
while(*str!=0){
Oled_Show_Char(row,col,*str);
str++;
col += 8;
}
}
显示代码实现
extern uint8_t buf;
unsigned int speedCnt = 0;
char speedMes[24]; //主程序发送速度数据的字符串缓冲区
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if (GPIO_Pin == GPIO_PIN_14)
if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_14) == GPIO_PIN_RESET)
speedCnt++;
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
printf("speed: %d\r\n", speedCnt);
sprintf(speedMes,"speed:%2d cm/s",speedCnt);//串口数据的字符串拼装,speed是格子,每个格子1cm
Oled_Show_Str(2,2,speedMes);
speedCnt = 0;
}
12、Wi-Fi测速小车并本地Oled显示
esp8266.c
#include "esp8266.h"
#include "stdio.h"
//1 工作在路由模式
char LYMO[] = "AT+CWMODE=2\r\n";
//2 使能多链接
char DLJ[] = "AT+CIPMUX=1\r\n";
//3 建立TCPServer
char JLFW[] = "AT+CIPSERVER=1\r\n"; // default port = 333
char AT_OK_Flag = 0; //OK返回值的标志位
char AT_Connect_Net_Flag = 0; //WIFI GOT IP返回值的标志位
char Client_Connect_Flag = 0;
void initWifi_AP(void)
{
printf(LYMO);
while(!AT_OK_Flag) HAL_Delay(50);
AT_OK_Flag = 0;
printf(DLJ);
while(!Client_Connect_Flag) HAL_Delay(50);
AT_OK_Flag = 0;
}
void waitConnect(void)
{
printf(JLFW);
while(!AT_OK_Flag) HAL_Delay(50);
AT_OK_Flag = 0;
}
esp8266.h
#ifndef __ESP8266_H_
#define __ESP8266_H_
void initWifi_AP(void);
void waitConnect(void);
#endif
usart.c
#include "motor.h"
#include "stdio.h"
#include "string.h"
//串口接收缓存(1字节)
uint8_t buf=0;
//定义最大接收字节数 200,可根据需求调整
#define UART1_REC_LEN 200
// 接收缓冲, 串口接收到的数据放在这个数组里,最大UART1_REC_LEN个字节
uint8_t UART1_RX_Buffer[UART1_REC_LEN];
// 接收状态
// bit15, 接收完成标志
// bit14, 接收到0x0d
// bit13~0, 接收到的有效字节数目
uint16_t UART1_RX_STA=0;
extern char AT_OK_Flag; //OK返回值的标志位
extern char AT_Connect_Net_Flag ; //WIFI GOT IP返回值的标志位
extern char Client_Connect_Flag;
#define SIZE 12
char buffer[SIZE];
// 接收完成回调函数,收到一个数据后,在这里处理
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
//判断中断由哪个串口触发
if(huart->Instance == USART1)
{
//判断接收是否完成(UART1_RX_STA bit15 位是否为1)
if((UART1_RX_STA & 0x8000) == 0)
{
//如果已经收到了 0x0d (回车),
if(UART1_RX_STA & 0x4000)
{
//判断是否收到 0x0a (换行)
if(buf == 0x0a)
{
//如果 0x0a和0x0d都收到,则将bit15位置为1
UART1_RX_STA |= 0x8000;
if(!strcmp(UART1_RX_Buffer, "WIFI GOT IP"))
AT_Connect_Net_Flag = 1;
// 查看是否收到 OK
if(!strcmp(UART1_RX_Buffer, "OK"))
AT_OK_Flag = 1;
// 查看是否收到 FAIL
if(!strcmp(UART1_RX_Buffer, "0,CONNECT"))
Client_Connect_Flag = 1;
if(!strcmp(UART1_RX_Buffer, "+IPD,0,4:M1"))
goForward();
else if(!strcmp(UART1_RX_Buffer, "+IPD,0,4:M2"))
goBack();
else if(!strcmp(UART1_RX_Buffer, "+IPD,0,4:M3"))
goLeft();
else if(!strcmp(UART1_RX_Buffer, "+IPD,0,4:M4"))
goRight();
else if(!strcmp(UART1_RX_Buffer, "+IPD,0,4:M0"))
stop();
memset(UART1_RX_Buffer, 0, UART1_REC_LEN);
UART1_RX_STA = 0;
}
else
//否则认为接收错误,重新开始
UART1_RX_STA = 0;
}
else // 如果没有收到了 0x0d (回车)
{
//则先判断收到的这个字符是否是 0x0d (回车)
if(buf == 0x0d)
{
//是的话则将 bit14 位置为1
UART1_RX_STA |= 0x4000;
}
else
{
//否则将接收到的数据保存在缓存数组里
UART1_RX_Buffer[UART1_RX_STA & 0X3FFF] = buf;
UART1_RX_STA++;
//如果接收数据大于UART1_REC_LEN(200字节),则重新开始接收
if(UART1_RX_STA > UART1_REC_LEN - 1)
UART1_RX_STA = 0;
}
}
}
//重新开启中断
HAL_UART_Receive_IT(&huart1, &buf, 1);
}
}
int fputc(int ch, FILE *f)
{
unsigned char temp[1]={ch};
HAL_UART_Transmit(&huart1,temp,1,0xffff);
return ch;
}
main.c
#include "motor.h"
#include "stdio.h"
#include "oled.h"
#include "esp8266.h"
extern uint8_t buf;
extern uint8_t buf;
unsigned int speedCnt = 0;
char speedMes[24]; //主程序发送速度数据的字符串缓冲区
//发送数据
char FSSJ[] = "AT+CIPSEND=0,5\r\n";
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if (GPIO_Pin == GPIO_PIN_14)
if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_14) == GPIO_PIN_RESET)
speedCnt++;
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
printf(FSSJ);
HAL_Delay(50);
sprintf(speedMes,"%2dcm/s",speedCnt);//串口数据的字符串拼装,speed是格子,每个格子1cm
printf(speedMes);
Oled_Show_Str(2,2,speedMes);
speedCnt = 0;
}
int main(void)
{
HAL_UART_Receive_IT(&huart1, &buf, 1);
HAL_TIM_Base_Start_IT(&htim2);
Oled_Init();
Oled_Screen_Clear();
HAL_Delay(1000);
initWifi_AP();
waitConnect();
}
这里由于定时器2中用到延时函数,所以需要通过Cubemx配置滴答定时器中断优先级,如下:
13、语音控制小车
#include "sg90.h"
#include "sr04.h"
#include "motor.h"
#include "oled.h"
#include "string.h"
#define MIDDLE 0
#define LEFT 1
#define RIGHT 2
#define BZ 1
#define XJ 2
#define GS 3
#define LeftWheel_Value_XJ HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_3)
#define RightWheel_Value_XJ HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_4)
#define LeftWheel_Value_GS HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_8)
#define RightWheel_Value_GS HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_9)
#define XJ_VALUE HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_14)
#define GS_VALUE HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_15)
#define BZ_VALUE HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_13)
char dir;
void xunjiMode()
{
if(LeftWheel_Value_XJ == GPIO_PIN_RESET && RightWheel_Value_XJ == GPIO_PIN_RESET)
goForward();
if(LeftWheel_Value_XJ == GPIO_PIN_SET && RightWheel_Value_XJ == GPIO_PIN_RESET)
goLeft();
if(LeftWheel_Value_XJ == GPIO_PIN_RESET && RightWheel_Value_XJ == GPIO_PIN_SET)
goRight();
if(LeftWheel_Value_XJ == GPIO_PIN_SET && RightWheel_Value_XJ == GPIO_PIN_SET)
stop();
}
void gensuiMode()
{
if(LeftWheel_Value_GS == GPIO_PIN_RESET && RightWheel_Value_GS == GPIO_PIN_RESET)
goForward();
if(LeftWheel_Value_GS == GPIO_PIN_SET && RightWheel_Value_GS == GPIO_PIN_RESET)
goRight();
if(LeftWheel_Value_GS == GPIO_PIN_RESET && RightWheel_Value_GS == GPIO_PIN_SET)
goLeft();
if(LeftWheel_Value_GS == GPIO_PIN_SET && RightWheel_Value_GS == GPIO_PIN_SET)
stop();
}
void bizhangMode()
{
double disMiddle;
double disLeft;
double disRight;
if(dir != MIDDLE){
sgMiddle();
dir = MIDDLE;
HAL_Delay(300);
}
disMiddle = get_distance();
if(disMiddle > 35){
//前进
goForward();
}else if(disMiddle < 10){
goBack();
}else
{
//停止
stop();
//测左边距离
sgLeft();
HAL_Delay(300);
disLeft = get_distance();
sgMiddle();
HAL_Delay(300);
sgRight();
dir = RIGHT;
HAL_Delay(300);
disRight = get_distance();
if(disLeft < disRight){
goRight();
HAL_Delay(150);
stop();
}
if(disRight < disLeft){
goLeft();
HAL_Delay(150);
stop();
}
}
HAL_Delay(50);
}
int main(void)
{
int mark = 0;
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_TIM4_Init();
MX_TIM2_Init();
MX_I2C1_Init();
initSG90();
HAL_Delay(1000);
dir = MIDDLE;
Oled_Init();
Oled_Screen_Clear();
Oled_Show_Str(2,2,"-----Ready----");
while (1)
{
if(XJ_VALUE == GPIO_PIN_RESET && GS_VALUE == GPIO_PIN_SET && BZ_VALUE ==
GPIO_PIN_SET)
{
if(mark != XJ)
{
Oled_Screen_Clear();
Oled_Show_Str(2,2,"-----XunJi----");
}
mark = XJ;
xunjiMode();
}
//满足循迹模式的条件
if(XJ_VALUE == GPIO_PIN_SET && GS_VALUE == GPIO_PIN_RESET && BZ_VALUE ==
GPIO_PIN_SET)
{
if(mark != GS)
{
Oled_Screen_Clear();
Oled_Show_Str(2,2,"-----GenSui----");
}
mark = GS;
gensuiMode();
}
//满足避障模式的条件
if(XJ_VALUE == GPIO_PIN_SET && GS_VALUE == GPIO_PIN_SET && BZ_VALUE ==
GPIO_PIN_RESET)
{
if(mark != BZ)
{
Oled_Screen_Clear();
Oled_Show_Str(2,2,"-----BiZhang----");
}
mark = BZ;
bizhangMode();
}
HAL_Delay(50);
}
}