Rendy Devara / Mbed OS STM32FC_RGB_WS2812

This is an example program of WS2812 library https://developer.mbed.org/users/devararendy/code/WS2812/ in main program, i also put some line to measure how many asm NOP do we need. I have test it on STM32F411RE (Nucleo 411RE). if you would like to use another microcontroller, you need to adjust the asm("nop") in the library.

Dependencies:   USBDevice WS2812 mbed-os

Diff: main.cpp

Revision:
2:0d3906d69a41
Parent:
0:a27bf0451169
diff -r c18078160be3 -r 0d3906d69a41 main.cpp
--- a/main.cpp	Sat Dec 10 08:38:13 2016 +0000
+++ b/main.cpp	Sat Dec 10 09:21:00 2016 +0000
@@ -4,11 +4,12 @@
 
 #define LED_RGB     PA_1
 
-WS2812 RGB(LED_RGB, 1);
-DigitalOut test(PB_7);
+WS2812 RGB(LED_RGB, 3);
+uint32_t colors[3]={0xFF0000,0xFFfe00,0xFF00FF};
+//DigitalOut test(PB_7);
 
-USBSerial serial;
-unsigned int timerValue;
+USBSerial serial; //Im using STM32F411RE. USB Serial USB Full Speed D+ = PA12, D- PA11. D+ Pulled Up w/ 1k5 resistor (1K ohm is working too)
+
 static TIM_HandleTypeDef s_TimerInstance = { 
     .Instance = TIM2
 };
@@ -17,7 +18,7 @@
     __TIM2_CLK_ENABLE();
     s_TimerInstance.Init.Prescaler = 1;
     s_TimerInstance.Init.CounterMode = TIM_COUNTERMODE_UP;
-    s_TimerInstance.Init.Period = 45000000; //tim clock = 45MHz, 1Sec = 1 Period
+    s_TimerInstance.Init.Period = 45000000; //Timer clock = 45MHz
     s_TimerInstance.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
     s_TimerInstance.Init.RepetitionCounter = 0;
     HAL_TIM_Base_Init(&s_TimerInstance);
@@ -31,7 +32,9 @@
        while(1)
        {
            /*
-           timerValue = __HAL_TIM_GET_COUNTER(&s_TimerInstance);
+           //to convert timer val to nanoSecond = val/45*1000
+           //example timer val for one asm("nop") is 3. convert to nanoSecond: 3/45*1000 = 66.666nS
+           unsigned int timerValue = __HAL_TIM_GET_COUNTER(&s_TimerInstance);
            test = 1;
             asm("nop");
             asm("nop");
@@ -223,6 +226,7 @@
             wait(2);
             */
             
+            /*
             RGB.send1Color(0xFF0000);
             Thread::wait(1000);
             RGB.send1Color(0xFF00);
@@ -248,6 +252,9 @@
             Thread::wait(1000);
             RGB.send1Color(0x009999);
             Thread::wait(1000);
+            */
             
+            RGB.sendColors(colors);
+            wait(1);
        }
 }
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