main.cpp

00001 /* Simpler prog based on the serial passthrough code to enable a command line driven test of esp8266
00002 * wifi modules.
00003 * NB this uses the mbed sleep() command to form a low power system but on some MCUs this is a problem
00004 * this works fine on an lpc1768 but not as yet on the KL25Z
00005 */
00006 #include "mbed.h"
00007 
00008 Serial pc(USBTX, USBRX); // serial terminal for the pc connection
00009 Serial dev(PTE0,PTE1);  // for KL25Z... asuming one can't use the PTA1 version which is the stdio
00010 DigitalOut led1(LED1); // twp leds
00011 DigitalOut led4(LED2); // to allow visual check of bidirectional comms
00012 DigitalOut rst(PTD7); // single digital pin to drive the esp8266 reset line
00013 
00014 // subroutine to run anytime a serial interrupt arrives from the device
00015 // this basically passes everything thatthe device produces on to the pc terminal screen
00016 void dev_recv()
00017 {
00018     led1 = !led1;
00019     while(dev.readable()) {
00020         pc.putc(dev.getc());
00021         wait_us(1);
00022     }
00023 }
00024 // subroutine to service the serial interrupt on the pc connection
00025 // this is a bit more complex - it takes what the use sends on the pc and copies it on to the device
00026 // the esp should echo these straight back to the the pc if all is well
00027 // this also detects the end of command character which is ascii 13 (0x0d) adn adds a linefeed after it =asscii 10 (0x0a)
00028 void pc_recv()
00029 {
00030     char c;
00031     led4 = !led4;
00032     while(pc.readable()) {
00033         c = pc.getc();
00034         dev.putc(c);
00035         //  pc.putc(c); // echo back
00036         if(c==13) {
00037             dev.putc(10); // send the linefeed to complement the carriage return generated by return key on the pc
00038             pc.putc(10);
00039         }
00040     }
00041 }
00042 
00043 int main()
00044 {
00045     pc.baud(115200);
00046     dev.baud(115200);
00047     rst=0;
00048     wait(1);
00049     rst = 1; // send the esp8266 reset
00050     wait(1);
00051 
00052     pc.attach(&pc_recv, Serial::RxIrq); // attach the two interrupt services
00053     dev.attach(&dev_recv, Serial::RxIrq);
00054     pc.printf("ok off we go....\n\r");
00055 //    wait(10);
00056 //    pc.printf("AT+RST\n\r");
00057 //    wait(20);
00058 //        pc.printf("AT+CWJAP="CWMWIFI","CWM2016TT""\n\r);
00059 
00060     while(1) {
00061 //        (i++)%10; // THIS USED TO BE A SLEEP COMMAND BUT IT WAS CAUSING SOME TROUBLE.
00062     }
00063 }