Diff: main.cpp

Revision:

0:156098cfb039

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Jun 25 15:51:09 2020 +0000
@@ -0,0 +1,80 @@
+/* Flow control with three threats
+* Blinking LEDs in the main and a thread for the led.
+* Reading analog input with 12 bits and calculating moving average in a thread for the potentiometer
+* connect:
+* D10 - 330 Ohm - LED - GND
+* D11 - 330 Ohm - LED - GND
+* GND - Pot 1
+* A3 - Pot 2
+* Vcc - Pot 3
+*
+* Tested with Nucleo-L432KC but should work with almost any board
+*
+* Thanks to "mbed-os-Flow-Control_Thread" example and AnalogIn API Reference
+* Timo Karppinen 25.6.2020, Apache 2.0
+*/ 
+
+#include "mbed.h"
+
+DigitalOut led1(D10);
+DigitalOut led2(D11);
+AnalogIn pot1(A3);
+#define numSamples 1024
+
+Thread threadL;
+Thread threadP;
+
+// Thread for the LED2. Sleeps for 1 second.
+void led2_thread()
+{
+    while (true) {
+        led2 = !led2;
+        printf("Led2 blink %d \n", led2.read());
+     
+        ThisThread::sleep_for(1000);
+    }
+}
+
+
+//Thread for the Pot. Sleeps for one millisecond in the middle of processing.
+void pot1_thread()
+{
+    while(true) {
+    uint16_t pot1Samples[numSamples];  //unsigned short in the range [0x0, 0xFFFF], [0, 65535]
+    int sum;
+    int result;
+    
+    for (int i = 0; i < numSamples; i++) {
+        pot1Samples[i] = pot1.read_u16()/16; // normalized into range [0x0, 0xFFFF] and to 12 bit [0x0, 0xFFF]
+        //printf("Pot1 sample %d \n", pot1Samples[i]);  // prints every sample
+        ThisThread::sleep_for(1);
+        }
+    printf("Results: ");  // always the average of last samples
+    sum = 0;
+    for (int i = 0; i < numSamples; i++) {
+        sum = sum + pot1Samples[i];
+        }
+    result = sum/numSamples;
+    printf("%d \n", result); 
+    }
+}
+
+// The main() is in it's own thread.
+int main()
+{
+    // Create a thread to execute the function led2_thread
+    threadL.start(led2_thread);
+    // led2_thread is executing concurrently with the main and other threads
+    
+       
+    // Create a thread to execute the function pot1_thread
+    threadP.start(pot1_thread);
+    // pot1_thread is executing concurrently with the main and other threads
+ 
+
+    while (true) {
+        led1 = !led1;
+        printf("Led1 blink %d \n", led1.read());
+        ThisThread::sleep_for(500);
+    }
+}