使用 C# 判斷有那些 Serial Port

    
    SerialPort ComPort = new SerialPort();
    string[] ports = SerialPort.GetPortNames();
    foreach(string portName in ports)
    {
        ComPort.PortName = portName;
        ComPort.BaudRate = 115200;
        ComPort.Parity = Parity.None;
        ComPort.StopBits = StopBits.One;
        ComPort.ReadTimeout = 500;
        ComPort.WriteTimeout = 500;
        try
        {
            ComPort.Open();
            ...
        }
        catch
        {
            ComPort.Close()
         
        }
    }

7zip batch file (add data into filename)

將 7zip 的壓縮指令寫成 batch file. 方便使用

setlocal
set hh=%time:~0,2%
if "%time:~0,1%"==" " set hh=0%hh:~1,1%
set yyyymmdd_hhmm=%date:~0,4%%date:~5,2%%date:~8,2%_%hh%%time:~3,2%

7z a zip_file%yyyymmdd_hhmm%.7z *.* -x!*.obj -r -x!obj
move zip_file%yyyymmdd_hhmm%.7z ..\backup\


其中 -x 是排除檔案的選項.
 -x!*.obj    --- *.obj 不加入到壓縮檔裡
 -x!obj    --- obj 檔名(或目錄名)不加入到壓縮檔裡

 而 -r 是包含子目錄

C# 呼叫 win32 API

在呼叫的函式前加入 win32API 的宣告

[DllImport("Kernel.dll")]
static extern uint QueryDosDevice(string lpDeviceName, IntPtr lpTargetPath, uint ucchMax);

public int queryFunc()
{   ...
    QueryDosDevice(...);
    ...
}

如何一次設定一個 Click Event Handler 到同一 StackPanel 裡的所有Button

ref : http://stackoverflow.com/questions/37876936/event-handler-formatting-multiple-buttons-wpf?noredirect=1&lq=1

有這樣的做法, 在前面指定 Button.Click :

<StackPanel Button.Click="button_Click" Grid.RowSpan="20">
     <Button Grid.Column="0" Grid.Row="0" FontWeight="Bold" BorderBrush="Black" Style="{StaticResource greenButton}">LT 1</Button>
     <Button x:Name="btn100" Grid.Column="0" Grid.Row="2" Style="{StaticResource greenButton}">100</Button>
     <Button x:Name="btn101" Grid.Column="0" Grid.Row="3" Style="{StaticResource greenButton}">101</Button>
     <Button x:Name="btn102" Grid.Column="0" Grid.Row="4" Style="{StaticResource greenButton}">102</Button>
 </StackPanel>

但是這樣會有 null exception 跑出來, 當然可以用 (e.OriginalSource as Button) 來避這個問題, 

也可以在 Style 裡用 EventSetter :

<Style x:Key="greenButton" TargetType="Button">
    ...
    <EventSetter Event="Click" Handler="button_Click"/>
</Style> 

WPF Binding

將 TextBox 裡的值隨著 ListBox 的選項改變

<ListBox x:Name="listBox" HorizontalAlignment="Left" Height="100" Margin="401,312,0,0" VerticalAlignment="Top" Width="100" >
    <ListBoxItem>Line 1</ListBoxItem>
    <ListBoxItem>Line 2</ListBoxItem>
</ListBox>
<TextBox x:Name="textBox" HorizontalAlignment="Left" Height="23" Margin="207,290,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120">
    <TextBox.Text>
        <Binding ElementName="listBox" Path="SelectedItem.Content"></Binding>
    </TextBox.Text>
</TextBox>
如下圖, TextBox 裡顯示 ListBox 選的項目:

MSP430 LaunchPad Timer_0 Interrupt

Using Timer_0 Interrupt to Toggle LED on MSP430 LaunchPad


#include <msp430.h>

#define OUTPUT_PIN  BIT0
/*
 * main.c
 *
 *  Testing timer_0 interrupt to toggle LED (P1.0)
 */

int main(void) {
    WDTCTL = WDTPW | WDTHOLD;   // Stop watchdog timer

    P1DIR |= OUTPUT_PIN; // Set P1.0 and P1.6 to output direction
    P1OUT |= OUTPUT_PIN;
    P1OUT ^= (OUTPUT_PIN);


    BCSCTL1 = CALBC1_8MHZ;
    DCOCTL = CALDCO_8MHZ;

    CCTL0 = CCIE;
    TACTL = TASSEL_2 + ID_3 + MC_1;     // Set the timer A to SMCLCK, UP to TACCR0, Input Divider: /8
    TACCR0 = 50000-1;       // 50ms @(8MHz/8)

    __enable_interrupt();

    __bis_SR_register(LPM0 + GIE); // LPM0 with interrupts enabled
    while(1);
}

// Timer A0 interrupt service routine
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A (void)
{
    static unsigned char ucCount = 0;
    if(ucCount++ >= 20){
        P1OUT ^= OUTPUT_PIN;
        ucCount = 0;
    }

}

LME288 的處理方法

1. Run command prompt as Administrator.
2. Type (without quotes) "bcdedit /set IncreaseUserVa 3072"
3. Reboot computer.