【STM32+OPENMV】二维云台颜色识别及追踪

一、准备工作

有关OPENMV最大色块追踪及与STM32通信内容，详情见【STM32+HAL】与OpenMV通信

有关七针OLED屏显示内容，详情见【STM32+HAL】七针OLED(SSD1306)配置(SPI版)

二、所用工具

1、芯片：STM32F407ZGT6

2、CUBEMX配置软件

3、KEIL5

4、OPENMV

三、实现功能

二维云台追踪最大色块，并显示中心x,y坐标至OLED

四、HAL配置步骤

1、生成两路PWM波控制舵机

周期为20ms

2、中断配置

五、KEIL填写代码

1、ptz.c

#include "ptz.h"
#include "string.h"
#include "stdio.h"
#include "stdlib.h"
#include "main.h"
#include "tim.h"
#include "usart.h"

#define RXBUFFERSIZE	256
#define CCR_UD 			TIM2->CCR2   	//up and down....		RANGE:420-2000		
#define CCR_LR 			TIM2->CCR3   	//Left and Right....	RANGE:420-2500  	
#define Cen_x  			160		//x轴中心坐标值
#define Cen_y  			120		//y轴中心坐标值

#define sp1				7       //x轴速度
#define sp2				6       //y轴速度
#define range			40      //识别范围



char RxBuffer[RXBUFFERSIZE],rx_buf[RXBUFFERSIZE];
uint8_t aRxBuffer;
uint8_t Uart1_Rx_Cnt = 0;

int cnt_rx=0,cnt_dt=0;
int cx=0,cy=0;




void Tilt(void)
{
	if(cx < (Cen_x-range)) CCR_LR = (CCR_LR>2450)?2450:CCR_LR+sp1;
	else if (cx > (Cen_x+range))	CCR_LR = (CCR_LR<450)?450:CCR_LR -sp1;
	else CCR_LR= CCR_LR;

	if(cy < (Cen_y-range)) CCR_UD = (CCR_UD<420)?420:CCR_UD -sp2;
	else if (cy > (Cen_y+range))	CCR_UD = (CCR_UD>1800)?1800:CCR_UD+sp2;
	else CCR_UD= CCR_UD;
}





void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    UNUSED(huart);
	if(huart==&huart2){
		RxBuffer[Uart1_Rx_Cnt] = aRxBuffer;
		Uart1_Rx_Cnt++;
		if((RxBuffer[Uart1_Rx_Cnt-1] == 0xb3)&&(RxBuffer[Uart1_Rx_Cnt-2] == 0xb3)) cnt_rx=1;		//帧头判定
		else if((RxBuffer[Uart1_Rx_Cnt-2] == 0x0d)&&(RxBuffer[Uart1_Rx_Cnt-1] == 0x0a)) cnt_rx=2;	//帧尾判定
		else cnt_rx=0;

		switch (cnt_rx)
        {
        	case 1:
				Uart1_Rx_Cnt = 0;
				memset(RxBuffer,0x00,sizeof(RxBuffer));
        		break;
        	case 2:
				RxBuffer[Uart1_Rx_Cnt-1] = '\0';
				RxBuffer[Uart1_Rx_Cnt-2] = '\0';
				strcpy(rx_buf,RxBuffer);

				int st=0;						//有效数值开始位置
				cnt_dt=0;						//空格数
				for(int i=0;rx_buf[i];i++){
					if(cnt_dt==4) break;
					if(rx_buf[i]==' ') {
						cnt_dt++;
						int temp=0;
						for(int j=st;j<i;j++)
							temp=temp*10+(rx_buf[j]-'0');
						switch (cnt_dt){
                        	case 1:cx=temp;break;
                        	case 2:cy=temp;break;
                        }
						st=i+1;
					}
				}

				while(HAL_UART_GetState(&huart2) == HAL_UART_STATE_BUSY_TX);
				Uart1_Rx_Cnt = 0;
				memset(RxBuffer,0x00,sizeof(RxBuffer));
        		break;
			default:break;
        }
	HAL_UART_Receive_IT(&huart2, (uint8_t *)&aRxBuffer, 1);
	}
}

2、main.c

  /* USER CODE BEGIN 2 */
	OLED_Init();

	HAL_UART_Receive_IT(&huart2, (uint8_t *)&aRxBuffer, 1);

	TIM2->CCR2 = 420-1;
	TIM2->CCR3 = 1400-1;
	HAL_TIM_PWM_Start (&htim2, TIM_CHANNEL_2);
	HAL_TIM_PWM_Start (&htim2, TIM_CHANNEL_3);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  OLED_ShowNum(30,20,cx,3,16);
	  OLED_ShowNum(30,40,cy,3,16);
	  OLED_Refresh();
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
	  if(flag) Tilt();
  }
  /* USER CODE END 3 */
}

3、按键控制暂停

/* USER CODE BEGIN 4 */

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)  
{
	if(GPIO_Pin == KEY0_Pin){
		HAL_Delay(20); //延时消抖
		if(GPIO_Pin == KEY0_Pin){
			flag=0;
		}
	}
}
/* USER CODE END 4 */