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

main.cpp

Committer:
devararendy
Date:
2016-12-10
Revision:
2:0d3906d69a41
Parent:
0:a27bf0451169

File content as of revision 2:0d3906d69a41:

#include "mbed.h"
#include "USBSerial.h"
#include "WS2812.h"

#define LED_RGB     PA_1

WS2812 RGB(LED_RGB, 3);
uint32_t colors[3]={0xFF0000,0xFFfe00,0xFF00FF};
//DigitalOut test(PB_7);

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
};
void InitializeTimer()
{
    __TIM2_CLK_ENABLE();
    s_TimerInstance.Init.Prescaler = 1;
    s_TimerInstance.Init.CounterMode = TIM_COUNTERMODE_UP;
    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);
    HAL_TIM_Base_Start(&s_TimerInstance);
}
int main(void)
{
       wait(3);
       InitializeTimer();
       serial.printf("Welcome to STM32FC RGB LED Tester\r\n");
       while(1)
       {
           /*
           //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");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
           timerValue = __HAL_TIM_GET_COUNTER(&s_TimerInstance) - timerValue;
           
           unsigned int timerValue2 = __HAL_TIM_GET_COUNTER(&s_TimerInstance);
           test = 0;
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
           timerValue2 = __HAL_TIM_GET_COUNTER(&s_TimerInstance) - timerValue2;
           
           serial.printf("Send 0 val %u, val2 = %u \r\n",  timerValue, timerValue2);
           ////////////////////////////////////////////////////////////////////////// 
           timerValue = __HAL_TIM_GET_COUNTER(&s_TimerInstance);
           test = 1;
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
           timerValue = __HAL_TIM_GET_COUNTER(&s_TimerInstance) - timerValue;
           
           timerValue2 = __HAL_TIM_GET_COUNTER(&s_TimerInstance);
           test = 0;
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
            asm("nop");
           timerValue2 = __HAL_TIM_GET_COUNTER(&s_TimerInstance) - timerValue2;
           
           serial.printf("Send 1 val %u, val2 = %u \r\n",  timerValue, timerValue2);
           */
           /*
            RGB.writeColor(0xffffff);
            RGB.sendReset();
            serial.printf("R = 0x%X, G = 0x%X ,B = 0x%X\r\n", RGB.Red, RGB.Green, RGB.Blue);
            wait(2);
            RGB.writeColor(0xff00ff);
            RGB.sendReset();
            serial.printf("R = 0x%X, G = 0x%X ,B = 0x%X\r\n", RGB.Red, RGB.Green, RGB.Blue);
            wait(2);
            RGB.writeColor(0xffff00);
            RGB.sendReset();
            serial.printf("R = 0x%X, G = 0x%X ,B = 0x%X\r\n", RGB.Red, RGB.Green, RGB.Blue);
            wait(2);
            */
            
            /*
            RGB.send1Color(0xFF0000);
            Thread::wait(1000);
            RGB.send1Color(0xFF00);
            Thread::wait(1000);
            RGB.send1Color(0xFF);
            Thread::wait(1000);
            RGB.send1Color(0xFFFF00);
            Thread::wait(1000);
            RGB.send1Color(0xFFFF);
            Thread::wait(1000);
            RGB.send1Color(0xFF00FF);
            Thread::wait(1000);
            
            RGB.send1Color(0xff8000);
            Thread::wait(1000);
            RGB.send1Color(0x9933ff);
            Thread::wait(1000);
            RGB.send1Color(0xff3300);
            Thread::wait(1000);
            RGB.send1Color(0x99cc00);
            Thread::wait(1000);
            RGB.send1Color(0xff99ff);
            Thread::wait(1000);
            RGB.send1Color(0x009999);
            Thread::wait(1000);
            */
            
            RGB.sendColors(colors);
            wait(1);
       }
}