Difference between revisions of "Maple Lesson 01 - Blinking LED"

Objective

Using Microduino-CoreSTM32 to control the on-board LED. Actually you can learn to how to use the Micrduino-CoreSTM32's I/O port. This is a basic skill you should master and for further study.

Prerequisites

• Setting Up Maple IDE for Microduino-CoreSTM32

Equipment

• Microduino-CoreSTM32

Microduino-CoreSTM32 is a 32-bit ARM Cortex-M3 development board, based on STMicroelectronics' STM32F103CBT6.

• Other hardware equipment
  • USB Data cable 1(one) piece

Program

• Using delay() function：

int led=4;
void setup() {
    // Set up the built-in LED pin as an output:
    pinMode(led, OUTPUT);
}

void loop() {
    digitalWrite(led, HIGH); //I/O port 4 output High. If the connection is high lighted,the LED will light, otherwise extinguished
    delay(1000);               // delay 1s
    digitalWrite(led, LOW); //I/O port 4 output Low.If the connection is high lighted,the LED off, otherwise light.
    delay(1000);
}

• Using function millis()：Return the number of milliseconds from start running Microduino program to now.

int ledPin=4;
#define TIME 1000 
long time1=0,time2=0;
void setup()
{
  pinMode(ledPin,OUTPUT);
}
void loop()
{
if(millis()<time2+TIME)
{
digitalWrite(ledPin,HIGH);
time1=millis();
}
else 
{
digitalWrite(ledPin,LOW);
if(millis()>time1+TIME)
time2=millis();
}
}

Using function millis () is better than the delay () function, less resource and fewer delays on the system.

Download program method

• Choose the board type in "tools", the "Microduino-CoreSTM32 to Flash" if you want to run the program after reset the board, or "Microduino-CoreSTM32 to RAM" if you just want to test it for one time.

• Compile downloads

Result

After the download, you can see LED flashes once every 1s.

Video