Diff: main.cpp

Revision:

1:4d30bb984196

Parent:

0:bab6dd4a9c11

--- a/main.cpp	Sat Oct 05 19:46:21 2013 +0000
+++ b/main.cpp	Thu May 01 02:07:51 2014 +0000
@@ -1,20 +1,76 @@
 #include "mbed.h"
+#include "rtos.h"
  
 Serial pc(USBTX, USBRX);
 //TX RX pins, see https://mbed.org/handbook/mbed-FRDM-KL25Z
-Serial uart(PTC4, PTC3);
+Serial uart(p9, p10);
 //to test is you can use a hard bridge (piece of cable) between PTC4 and PTC3 open a terminal and write something :) 
 //you can integrate this to improve some interesting aplicattions like this:
 //http://www.instructables.com/id/Temperature-sensor--weatherstation/http://www.instructables.com/id/Temperature-sensor--weatherstation/ 
 DigitalOut pc_activity(LED1);
 DigitalOut uart_activity(LED2);
+DigitalIn receive(p10);
+
+Timer t;
+int state = 0;
+int period = 0;
+int baud_rate = 0;
  
+void baud_thread(void const *args) {
+    while (true) {
+        uart.putc(0x55);        
+        Thread::wait(1000);
+        if (period)
+            pc.printf("baud rate %d ", baud_rate);
+    }
+}
+
+void get_rate(int *baud_rate) {    
+    if (*baud_rate > 90000 && *baud_rate < (int)(125200))
+        *baud_rate = 115200;
+    else if (*baud_rate > (int)0.9*9600 && *baud_rate < (int)1.1*9600)
+        *baud_rate = 9600;
+    else
+        *baud_rate = 0;
+}
+            
+
 int main() {
+
+    int stop = 0;
+    int counter = 0;
+    uart.baud(115200);
+    Thread thread(baud_thread);
+    
+    pc.printf("started \n");
     while(1) {
+        if (state == 0)
+            if(receive) {
+                state = 1;
+            }
+            
+        if (state == 1)
+            if(!receive) {
+                t.start();
+                state = 2;
+            }
+            
+        if (state == 2)
+            if(receive) {
+                t.stop();
+                period = t.read_us();
+                baud_rate = (int)(1.0/((float)t.read_us()/1000000.0));
+                get_rate(&baud_rate);
+                uart.putc(0xAA);
+                t.reset();
+                state = 0;
+            }
+        
         if(pc.readable()) {
             uart.putc(pc.getc());
             pc_activity = !pc_activity;
         }
+        
         if(uart.readable()) {
             pc.putc(uart.getc());
             uart_activity = !uart_activity;