Brian Jepson / Mbed OS frdm_helloworld_rtos

A modified version of the hello world program to run using RTOS threads. Also, it cycles through seven colors on the RGB LED while it's doing its thing.

Fork of frdm_helloworld by NXP

Files at this revision

API Documentation at this revision

Revision 4:f52f79d2f703, committed 2016-08-23

Comitter:
bjepson
Date:
Tue Aug 23 01:31:09 2016 +0000
Parent:
3:fd99fd0c7e60
Commit message:
All three functions (led cycle, two buttons) are in threads now.

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed-os.lib Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show diff for this revision Revisions of this file 
--- a/main.cpp	Tue Aug 23 01:00:23 2016 +0000
+++ b/main.cpp	Tue Aug 23 01:31:09 2016 +0000
@@ -4,56 +4,79 @@
 DigitalOut led_red(LED_RED);
 DigitalOut led_green(LED_GREEN);
 DigitalOut led_blue(LED_BLUE);
+
 DigitalIn sw2(SW2);
 DigitalIn sw3(SW3);
+
 Serial pc(USBTX, USBRX);
 
-void check_sw2_thread(void const *args)
+void check_sw2_thread()
 {
     while(true) {
         if (sw2 == 0) {
             pc.printf("SW2 button pressed. \n");
+            while(sw2 == 0) { // debounce
+                Thread::wait(.3);
+            }
+        }
+        Thread::wait(.3);
+    }
+}
+
+void check_sw3_thread()
+{
+    while(true) {
+        if (sw3 == 0) {
+            pc.printf("SW3 button pressed. \n");
+            pc.printf("5 characters will be echoed. Start typing. \n");
+            for (uint32_t i = 0; i < 5; i++) {
+                pc.putc(pc.getc());
+            }
+            pc.putc(13); /* CR */
+            pc.putc(10); /* LF */
         }
         Thread::wait(.3);
     }
 }
 
-void check_sw3(void)
+// Cycle through seven colors
+void strobe_led_thread()
 {
-    if (sw3 == 0) {
-        pc.printf("SW3 button pressed. \n");
-        //led_green = 0;
-        //led_red = 1;
-        pc.printf("5 characters will be echoed. Start typing. \n");
-        for (uint32_t i = 0; i < 5; i++) {
-            pc.putc(pc.getc());
+    while(true) {
+        for (int i = 0; i < 8; i++) {
+            led_red =   !(i & 0x01);
+            led_green = !(i & 0x02);
+            led_blue =  !(i & 0x04);
+            wait(0.5);
         }
-        pc.putc(13); /* CR */
-        pc.putc(10); /* LF */
     }
 }
 
 int main()
 {
-    Thread thread(check_sw2_thread);
-
     pc.baud(115200);
     pc.printf("Hello World from FRDM-K64F board.\n");
 
-    int i = 1;
-    while (true) {
-        check_sw3();
+    Thread sw2thread;
+    osStatus err = sw2thread.start(&check_sw2_thread);
+    if (err) {
+        pc.printf("%d", err);
+    }
+
+    Thread sw3thread;
+    err = sw3thread.start(&check_sw3_thread);
+    if (err) {
+        pc.printf("%d", err);
+    }
 
-        i += 1;
-        if (i > 7) {
-            i = 1;
-        }
-        led_red =   !(i & 0x01);
-        led_green = !(i & 0x02);
-        led_blue =  !(i & 0x04);
-        //pc.printf("i = %d: R = %d; G = %d; B = %d\n", i, led_red.read(), led_green.read(), led_blue.read());
+    Thread strobethread;
+    err = strobethread.start(&strobe_led_thread);
+    if (err) {
+        pc.printf("%d", err);
+    }
 
-        wait(0.1);
-
-    }
+    // wait for threads to terminate
+    sw2thread.join();
+    sw3thread.join();
+    strobethread.join();
 }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Tue Aug 23 01:31:09 2016 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#d2202045ac8f2fc63836a5b7131c9b56ac58f06a

--- a/mbed.bld	Tue Aug 23 01:00:23 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/6473597d706e
\ No newline at end of file