江门网站建设推荐,wordpress设置可写,网站开发有什么网站,宁波方正建设监理网站一、需求描述#xff1a; rk3568开发板运行OpenHarmony4.0#xff0c;通过开发板上的uart串口与电脑进行通讯#xff0c;相互收发字符串。
二、案例展示 1、开发环境#xff1a; #xff08;1#xff09;rk3568开发板 #xff08;2#xff09;系统#xff1a;OpenHar…一、需求描述 rk3568开发板运行OpenHarmony4.0通过开发板上的uart串口与电脑进行通讯相互收发字符串。
二、案例展示 1、开发环境 1rk3568开发板 2系统OpenHarmony 3电脑Windows11笔记本串口调试助手 4Deveco StudioevEco Studio 4.0 Release 4.0.0.600
2、下载并运行开发案例 下载开发案例使用Deveco Studio打开运行编译、下载应用到rk3568开发板。开发板运行demo界面如下图所示。(.hap应用文件见附件) 1点击波特率选择按钮选择相应的波特率点击地址输入框输入使用的串口的设备地址这里以uart5设备地址/dev/ttyS5为例选择波特率9600。 2将开发板通过串口转USB的转接线将开发板与笔记本连接起来电脑打开一个串口调试助手如下图所示。 3开发板点击“开启按钮”打开串口然后点击“发送”按钮想电脑通过串口发送输入框的字符串电脑运行的串口调试助手接信息并回显接收到的字符串同理电脑通过串口调试助手想开发板发送字符串开发板接收信息并在回显框中回显接收到的字符串如下图所示。 4测试效果 OpenHarmony串口通讯展示 注意运行demo应确保开发板的串口节点已被引出可用且读写权限已被允许
三、应用开发流程 该应用的开发使用NAPI方式来编写使用串口的NAPI函数通过这些函数来对串口进行设置打开发送和接收数据NAPI使用详见NAPI篇。在应用界面编写中引用NAPI函数进行逻辑构建完成应用开发。 1、应用界面编写Index.ets
import BQNapi from libentry.so;//引入NAPI
import promptAction from ohos.promptAction;const TAG uartToComputerEntry
Component
struct Index {State isStart: boolean false;private dateTime: Date new Date();private scroller: Scroller new Scroller()State receiveMessage: string ;State sendMessage: string https://www.bearkey.net/;State currentUart: string ;private UartPort: string /dev/ttyS5private UartBand: string[] [9600, 19200, 38400, 57600, 115200]private UartBand_N: number[] [9600, 19200, 38400, 57600, 115200]State currentUartBandIndex: number 0State bandRate: number 0;private fd: number -1;private setIntervalID: number -1;aboutToAppear() {// this.fd BQNapi.open_port(this.currentUart, 115200);// console.log(TAG, 打开串口${this.currentUart},ret${this.fd})this.setIntervalID setInterval(() {//判断是否有串口开启if (this.fd 0) {//获取开启状态this.isStart true//获取波特率this.bandRate BQNapi.getBandRate(this.fd)let temp: string BQNapi.series_receive_data(this.fd);if (temp -1) {console.log(TAG, 未接收到数据或接收失败);} else {this.dateTime new Date();let year: number this.dateTime.getFullYear(); //当前年let month this.dateTime.getMonth() 1;let date this.dateTime.getDate();let hours this.dateTime.getHours();let minutes this.dateTime.getMinutes();let seconds this.dateTime.getSeconds();let curryDateTime: string year - month - date hours : minutes : seconds;temp curryDateTime \n temp;this.receiveMessage temp this.receiveMessagethis.scroller.scrollTo({ xOffset: 0, yOffset: 0 })}} else {this.isStart falsethis.bandRate 0;this.currentUart -}}, 300)}aboutToDisappear() {console.log(TAG, 退出应用)clearInterval(this.setIntervalID);if (this.fd 0) {let e: number BQNapi.close_port(this.fd);console.log(TAG, 关闭串口${this.currentUart},ret${e})if (e 0) {console.log(TAG, 关闭成功)} else {console.log(TAG, 关闭失败)}}}build() {Column() {Row() {Text(回显框).fontSize(25).size({ width: 50%, height: 30 })Button(清空窗口).fontSize(30).size({ width: 160, height: 40 }).onClick(() {this.receiveMessage ;});}.justifyContent(FlexAlign.SpaceAround).margin({ top: 10, }).size({ width: 100%, height: 50 })Scroll(this.scroller) {Column() {Text(this.receiveMessage).fontSize(20).size({ width: 100% }).constraintSize({ minHeight: 30 }).margin({ top: 10, bottom: 10 }).padding(10).textAlign(TextAlign.Start)}.size({ width: 100% }).constraintSize({ minHeight: 300 }).justifyContent(FlexAlign.Start)}.size({ width: 100%, height: 150 }).border({ width: 1, style: BorderStyle.Solid, radius: 10 })Row() {Text(输入框).fontSize(25).size({ width: 100%, height: 40 })}.justifyContent(FlexAlign.SpaceAround).margin({ top: 10, }).size({ width: 100%, height: 50 })TextInput({ placeholder: 请输入需要发送的内容..., text: this.sendMessage }).fontSize(25).size({ width: 100%, height: 50 }).border({ width: 1, style: BorderStyle.Solid, radius: 10 }).margin({ bottom: 10 }).onChange((value) {this.sendMessage value;})Row() {Button(发送).fontSize(30).enabled(this.isStart).size({ width: 120, height: 40 }).onClick(() {let a: number BQNapi.series_send_data(this.sendMessage, this.fd)if (a 0) {console.log(TAG, 发送成功);} else {console.log(TAG, 发送失败);}})Button(清空).fontSize(30).enabled(this.isStart).size({ width: 120, height: 40 }).onClick(() {this.sendMessage ;})}.justifyContent(FlexAlign.SpaceAround).margin({ top: 10, }).size({ width: 100%, height: 50 })Row() {Text(当前串口信息).fontSize(25).size({ width: 100%, height: 30 })}.justifyContent(FlexAlign.SpaceAround).margin({ top: 10, }).size({ width: 100%, height: 50 })Column() {Row() {Text(波特率).fontSize(25).size({ width: 40%, height: 30 }).textAlign(TextAlign.Center)Text(this.bandRate.toString()).fontSize(28).size({ width: 60%, height: 30 }).textAlign(TextAlign.Center)}.justifyContent(FlexAlign.SpaceAround).size({ width: 100%, height: 40 })Row() {Text(当前串口).fontSize(25).size({ width: 40%, height: 30 }).textAlign(TextAlign.Center)Text(this.currentUart).fontSize(28).size({ width: 60%, height: 30 }).textAlign(TextAlign.Center)}.justifyContent(FlexAlign.SpaceAround).size({ width: 100%, height: 40 })}.size({ width: 100%, height: 100 }).justifyContent(FlexAlign.SpaceAround).border({ width: 1, style: BorderStyle.Solid, radius: 10 })Row() {Button(this.UartBand[this.currentUartBandIndex]).fontSize(25).size({ width: 30%, height: 45 }).onClick(() {this.showPickerDialogForUartBand()})TextInput({ placeholder: 请输入串口地址, text: this.UartPort }).fontSize(25).border({ width: 1, style: BorderStyle.Solid, radius: 10 }).size({ width: 60%, height: 45 }).onChange((value) {this.UartPort value;})}.justifyContent(FlexAlign.SpaceAround).margin({ top: 10, }).size({ width: 100%, height: 50 })Row() {Button(开启).fontSize(35).size({ width: 30%, height: 45 }).backgroundColor(this.isStart ? Color.Green : Color.Blue).onClick(() {if (this.isStart) {promptAction.showToast({message: 请先停止当前串口,duration: 500})} else {this.fd BQNapi.open_port(this.UartPort, this.UartBand_N[this.currentUartBandIndex]);if (this.fd 0) {console.log(TAG, 打开串口${this.currentUart},ret${this.fd})this.currentUart this.UartPort;promptAction.showToast({message: 开启成功,duration: 500})} else {promptAction.showToast({message: 开启失败,duration: 500})}}})Button(停止).fontSize(35).size({ width: 30%, height: 45 }).backgroundColor(this.isStart ? Color.Red : Color.Blue).onClick(() {if (this.isStart) {let e: number BQNapi.close_port(this.fd);console.log(TAG, 关闭串口${this.currentUart},ret${e})if (e 0) {promptAction.showToast({message: 关闭成功,duration: 500})this.fd -1;this.currentUart ...console.log(TAG, 关闭成功)} else {console.log(TAG, 关闭失败)promptAction.showToast({message: 关闭失败,duration: 500})}} else {promptAction.showToast({message: 未启用串口,duration: 500})}})}.justifyContent(FlexAlign.SpaceAround).margin({ top: 20, }).size({ width: 100%, height: 50 })}.size({ width: 100%, height: 100% }).padding(10).justifyContent(FlexAlign.Start).alignItems(HorizontalAlign.Center)}showPickerDialogForUartBand() {TextPickerDialog.show({range: this.UartBand,selected: this.currentUartBandIndex,disappearTextStyle: { color: Color.Red, font: { size: 15, weight: FontWeight.Lighter } },textStyle: { color: Color.Black, font: { size: 20, weight: FontWeight.Normal } },selectedTextStyle: { color: Color.Blue, font: { size: 30, weight: FontWeight.Bolder } },onAccept: (value: TextPickerResult) {let temp value.value as stringthis.currentUartBandIndex value.index as number},onCancel: () {console.info(TAG, TextPickerDialog:onCancel())},onChange: (value: TextPickerResult) {console.info(TAG, TextPickerDialog:onChange() JSON.stringify(value))}})}
}2、NAPI函数引出声明(index.d.ts)
export const open_port: (port_address: string, band_rate: number) number; //打开串口打开成功返回描述符int失败-1export const close_port: (serial_port: number) number; //关闭串口关闭成功返回0,失败则返回-1.export const series_send_data: (tx_data: string, serial_port: number) number; //发送数据export const series_receive_data: (serial_port: number) string; //接收数据成功返回接收字符串失败返回-1export const getBandRate: (serial_port: number) number; //查询波特率成功返回波特率失败返回-13、完整应用工程源码私信
声明非本人允许严禁转载演示开发板为厦门贝启科技的BQ3568HM产品
1首页-贝启科技官方企业店-淘宝网
2厦门贝启科技有限公司-Bearkey-官网
