main.cpp

00001 #include "mbed.h"
00002 #include "EthernetInterface.h"
00003 #include "HTTPD.h"
00004 
00005 EthernetInterface *eth;
00006 HTTPD *httpd;
00007 
00008 Serial pc(USBTX, USBRX);
00009 InterruptIn probe(p8);
00010 LocalFileSystem local("local");
00011 DigitalOut led1(LED1), led2(LED2);
00012 Timer timer;
00013 Ticker ticker;
00014 
00015 uint32_t low_time = 0;
00016 
00017 void down();
00018 void up();
00019 
00020 void tick()
00021 {
00022     pc.printf("%d us, %f %%\r\n", low_time, low_time / (30.0 * 1000000));
00023     low_time = 0;
00024 }
00025  
00026 void down()
00027 {
00028     probe.rise(&up);
00029     led1 = 0;
00030     timer.start();
00031 }
00032 
00033 void up()
00034 {
00035     led1 = 1;
00036     timer.stop();
00037     probe.fall(&down);
00038     
00039     low_time += timer.read_us();
00040     timer.reset();
00041 }
00042 
00043 void callback_api(int id) {
00044     int i, n;
00045     char low_time_buf[256];
00046     char buf[256];
00047     
00048     sprintf( low_time_buf, "%f", low_time / (30.0 * 1000000));
00049     strcpy(buf, "{"); 
00050     strcat(buf, "success: true ,");
00051     strcat(buf, "data: {");
00052     strcat(buf, "lowpulseoccupancytime: ");
00053     strcat(buf, low_time_buf);
00054     strcat(buf, "}");
00055     strcat(buf, "}");
00056 
00057     n = strlen(buf);
00058     i = httpd->receive(id, &buf[n], sizeof(buf) - n);
00059     if (i < 0) return;
00060     i += n;
00061     buf[i] = 0;
00062     printf("API %d %s\r\n", id, buf);
00063     httpd->send(id, buf, i, "Content-Type: text/plain\r\n");
00064 }
00065 
00066 int main() {
00067     pc.baud(115200);
00068     pc.printf("Dust Sensor test\r\n");
00069     probe.fall(&down);
00070     ticker.attach(tick, 30);
00071     
00072     printf("HTTP Server...\r\n");
00073 
00074     eth = new EthernetInterface;
00075     eth->init("192.168.21.81", "255.255.255.0", "192.168.21.2" );
00076 
00077     if (eth->connect()) return -1;
00078 
00079     printf("IP Address is %s\r\n", eth->getIPAddress());
00080     httpd = new HTTPD;
00081     httpd->attach("/1/mbed/lpc1768/sensor/dust/sen12291p", &callback_api);
00082     httpd->attach("/", "/local/");
00083     httpd->start(80);
00084     printf("httpd ready\r\n");
00085     led2 = 1;  
00086 }
00087