Question

就像问题一样，我正试图通过Chrome应用程序通过网页与串行设备进行通信。目标是通过网页上的按钮打开开关，并确保开关实际上已打开（串行响应）。到目前为止，我已经能够打开开关了，但是我需要验证它实际上已启用。

我的Chrome应用代码：

chrome.runtime.onMessageExternal.addListener(
    function(request, sender, sendResponse) {
        if (request.request == 'info') {
            sendResponse(DEVICE_INFO);
        } else if (request.request == 'turn_off') {
            device_array.forEach(function(device){
                if (device.id == request.device_id){
                    device.send('f');
                }
            });

//INSTEAD OF "OK" I NEED IT TO ASK THE DEVICE TO CONFIRM OFF/ON STATUS
            sendResponse('OK'); 

        } else if (request.request == 'turn_on') {
            device_array.forEach(function(device){
                if (device.id == request.device_id){
                    device.send('n');
                }
            });
            sendResponse('OK');
        }
        return true;
    });

如果我向设备发送“状态”查询，它将花费几毫秒来响应“关闭”或“打开”到串行缓冲区。关于如何解决这个问题的任何想法？提前致谢。

Answer 1

最终，我通过在侦听器代码块中请求设备状态来使其工作。以下是修改，粗略但它完成了工作。 DEVICE_STATUS由串行连接上的onReceive侦听器更新。

chrome.runtime.onMessageExternal.addListener(
    function(request, sender, sendResponse) {
        if (request.request == 'info') {
            sendResponse(DEVICE_INFO);
        } else if (request.request == 'turn_off') {
            device_array.forEach(function(device){
                if (device.id == request.device_id){
                    device.send('f');
                }
            });             
            var time_loop = 0;
            connection.send('s'); // s is for STATUS
            var timer = setInterval(device_is_off, 200);

            function device_is_off(){
                if (time_loop > 5){ //Serial Communication Timeout at 1sec 
                    sendResponse('ERROR ' + DEVICE_STATUS);
                    clearInterval(timer);
                    return;
                }
                if (DEVICE_STATUS == 0){
                    sendResponse('OK');
                    clearInterval(timer);
                    return
                }
                else time_loop++;
            }

        } else if (request.request == 'turn_on') {
            device_array.forEach(function(device){
                if (device.id == request.device_id){
                    device.send('n');
                }
            });             
            var time_loop = 0;
            connection.send('s'); // s is for STATUS
            var timer = setInterval(device_is_on, 200);

            function device_is_on(){
                if (time_loop > 5){
                    sendResponse('ERROR ' + DEVICE_STATUS);
                    clearInterval(timer);
                    return;
                }
                if (DEVICE_STATUS == 1){
                    sendResponse('OK');
                    clearInterval(timer);
                    return
                }
                else time_loop++;
            }
        }
        return true;
    });

从串口通信 - ＆gt; Chrome应用 - ＆gt;网页。网页启动。

1 个答案: