蓝牙通信代码求解

a3623037

[mw_shl_code=c,true]#include "sys.h" #include "delay.h" #include "usart.h" #include "led.h" #include "lcd.h" #include "usmart.h" #include "hc05.h" #include "usart3.h" #include "key.h" #include "string.h" //ALIENTEK 探索者STM32F407开发板 扩展实验1 //ATK-HC05蓝牙串口模块实验 -库函数版本 //技术支持：www.openedv.com //淘宝店铺：http://openedv.taobao.com //广州市星翼电子科技有限公司 //作者：正点原子 @ALIENTEK //显示ATK-HC05模块的主从状态 void HC05_Role_Show(void) { if(HC05_Get_Role()==1)LCD_ShowString(30,140,200,16,16,"ROLE:Master"); //主机 else LCD_ShowString(30,140,200,16,16,"ROLE:Slave "); //从机 } //显示ATK-HC05模块的连接状态 void HC05_Sta_Show(void) { if(HC05_LED)LCD_ShowString(120,140,120,16,16,"STA:Connected "); //连接成功 else LCD_ShowString(120,140,120,16,16,"STAisconnect"); //未连接 } int main(void) { u8 t; u8 key; u8 sendmask=0; u8 sendcnt=0; u8 sendbuf[20]; u8 reclen=0; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置系统中断优先级分组2 delay_init(168); //初始化延时函数 uart_init(115200); //初始化串口波特率为115200 usmart_dev.init(84); //初始化USMART LED_Init(); //初始化LED KEY_Init(); //初始化按键 LCD_Init(); //初始化LCD POINT_COLOR=RED; LCD_ShowString(30,30,200,16,16,"ALIENTEK STM32F4 ^_^"); LCD_ShowString(30,50,200,16,16,"HC05 BLUETOOTH COM TEST"); LCD_ShowString(30,70,200,16,16,"ATOM@ALIENTEK"); delay_ms(1000); //等待蓝牙模块上电稳定 while(HC05_Init()) //初始化ATK-HC05模块 { LCD_ShowString(30,90,200,16,16,"ATK-HC05 Error!"); delay_ms(500); LCD_ShowString(30,90,200,16,16,"Please Check!!!"); delay_ms(100); } LCD_ShowString(30,90,210,16,16,"KEY_UP:ROLE KEY0:SEND/STOP"); LCD_ShowString(30,110,200,16,16,"ATK-HC05 Standby!"); LCD_ShowString(30,160,200,16,16,"Send:"); LCD_ShowString(30,180,200,16,16,"Receive:"); POINT_COLOR=BLUE; HC05_Role_Show(); delay_ms(100); USART3_RX_STA=0; while(1) { key=KEY_Scan(0); if(key==WKUP_PRES) //切换模块主从设置 { key=HC05_Get_Role(); if(key!=0XFF) { key=!key; //状态取反 if(key==0)HC05_Set_Cmd("AT+ROLE=0"); else HC05_Set_Cmd("AT+ROLE=1"); HC05_Role_Show(); HC05_Set_Cmd("AT+RESET"); //复位ATK-HC05模块 delay_ms(200); } }else if(key==KEY0_PRES) { sendmask=!sendmask; //发送/停止发送 if(sendmask==0)LCD_Fill(30+40,160,240,160+16,WHITE);//清除显示 }else delay_ms(10); if(t==50) { if(sendmask) //定时发送 { sprintf((char*)sendbuf,"ALIENTEK HC05 %d\r\n",sendcnt); LCD_ShowString(30+40,160,200,16,16,sendbuf); //显示发送数据 u3_printf("ALIENTEK HC05 %d\r\n",sendcnt); //发送到蓝牙模块 sendcnt++; if(sendcnt>99)sendcnt=0; } HC05_Sta_Show(); t=0; LED0=!LED0; } if(USART3_RX_STA&0X8000) //接收到一次数据了 { LCD_Fill(30,200,240,320,WHITE); //清除显示 reclen=USART3_RX_STA&0X7FFF; //得到数据长度 USART3_RX_BUF[reclen]=0; //加入结束符 if(reclen==9||reclen==8) //控制DS1检测 { if(strcmp((const char*)USART3_RX_BUF,"+LED1 ON")==0)LED1=0; //打开LED1 if(strcmp((const char*)USART3_RX_BUF,"+LED1 OFF")==0)LED1=1;//关闭LED1 } LCD_ShowString(30,200,209,119,16,USART3_RX_BUF);//显示接收到的数据 USART3_RX_STA=0; } t++; } }[/mw_shl_code]

[mw_shl_code=c,true]这个t的设置有什么作用，为什么要设置循环50次后才执行一次发送，是为了发送数据的延迟吗？[/mw_shl_code]

正点原子

是的，就是起个延时控制的作用。