Jump to content


  • Content Count

  • Joined

  • Last visited

  • Days Won


Posts posted by rubfi

  1. Really nice project especially from software side, Android is fantastic OS because of free development add-on for eclipse. If you're using UART it is easy to make wireless communication via bluetooth. I did something similar with this module and based on this Java code - it's good point to start with android.


     Thanks for your comment and for the link to the Bluetooth Debugging Assistant. It will be really useful for future projects.

  2. Find here a small guide for building the Android side of the app (The launchpad side can be found on the original post)


    Android App Setup


    Download Android Serialport API code (I used the revision 54 for the pinball proof of concept)

    $ mkdir build
    $ cd build
    $ svn checkout -r54 http://android-serialport-api.googlecode.com/svn/trunk/ android-serialport-api 

    Download Vector Pinball code (rev  04ee044b27)

    $ git clone https://github.com/dozingcat/Vector-Pinball.git
    $ cd Vector-Pinball/
    $ git checkout 04ee044b27

    Apply the modifications to the Vector Pinball (MSP430Pinball.patch is attached to this post, copy it to build dir) 

    patch -p1 < ../MSP430Pinball.patch

    Copy serial port code and libs on the Vector Pinball tree.

    $ cp -r ../android-serialport-api/android-serialport-api/project/src/android_serialport_api/ src/
    $ rm -rf src/android_serialport_api/sample/
    $ cp -r ../android-serialport-api/android-serialport-api/project/libs/armeabi/libserial_port.so libs/armeabi/
    $ cp -r ../android-serialport-api/android-serialport-api/project/libs/armeabi-v7a/libserial_port.so libs/armeabi-v7a/

    You may need to modify "src/android_serial_port/SerialPort.java" for pointing the "su" path to the "su" command on your Android device. In my case, I did:

    $ vim src/android_serialport_api/SerialPort.java
    -           su = Runtime.getRuntime().exec("/system/bin/su");
    +           su = Runtime.getRuntime().exec("/system/xbin/su");

    To import the modified VectorPinball project to your Android Development environment (In eclipse  File > New >> Project... >> Android project from existing code -> Root directory = <path_to_vector_pinball> )


    Adding Serial Port emulation over USB to your OTG supporting Android Tablet

    (in my case an Allwiner A10 based)


    Download the kernel source code (I used the lichee3 branch in order to create a module compatible with the kernel already in the device)

    $ git clone -b lichee-3.0.8-sun4i  git://github.com/linux-sunxi/linux-sunxi.git

    Configure the kernel, for adding CDC_ACM support

    $ make ARCH=arm sun4i_crane_defconfig
    $ make ARCH=arm menuconfig
    Device Drivers >> USB Support >> <M>   USB Modem (CDC ACM) support

    Compile the kernel and the modules

    $ export PATH=$PATH:/<path_to_your_cross_compiler>/bin
    (i.e "export PATH=$PATH:/opt/arm-2010q1/bin" )
    $ export CROSS_COMPILE=arm-none-linux-gnueabi-
    $ make ARCH=arm
    $ make ARCH=arm modules

    Copy the cdc-acm.ko module to your Android device and install it

    $ scp drivers/usb/class/cdc-acm.ko root@<ip>:/data/local/
    ( i.e $ scp drivers/usb/class/cdc-acm.ko root@ )
    (I used DropBear SSH Server II on Android as SSH server)

    After copying cdc-acm.ko, you should ssh your Android device and execute as root "insmod cdc-acm.ko". (you may need to do this step every time you reboot your tablet). Check if /dev/ttyACM0 has been created after loading cdc-acm.ko in order to see if the module was installed correctly.


    From Eclipse build the apk or launch the BouncyActivity app.

    Hopefully, following these steps it works for you, and you can build awesome apps using MSP430 Launchpad and Android.


  3. Hi everyone,


    I wanted to connect a MSP430 to an Android device. In fact, my idea was to use the MSP430 launchpad as a low-cost GPIO board for an Android tablet. I did a little research, and first thought on the audio port for the communication ( http://robots-everywhere.com/re_wiki/index.php?title=Serial_on_Android_using_the_audio_port ) but then I remembered that the tablet supported USB OTG. So, I compiled the CDC_ACM module for the (Allwinner A10 based) tablet in order to emulate serial port over USB.


    Then, in the MSP430 Launchpad side, I needed a lib for using the serial port. I found MSP430-softuart by Stefan Wendler (https://github.com/wendlers/msp430-softuart) and used it for the bidirectional communication Android-Tablet<->MSP430-Launchpad.


    In order to make a demo, I modified the code of Open Source Vector Pinball (http://dozingcatsoftware.com/VectorPinball/index.html ), adding support for serial port access (using  http://code.google.com/p/android-serialport-api/). This modified Vector Pinball has the flippers linked to MSP430 Launchpad buttons. When the buttons on P2.5 and P2.3 are pressed they flippers are activated. A LED is also connected on P1.6 in order to toggle it when receiving "toggle" command from the Android app. 


    You can find the video demo here:


    This is the source code for the MSP430 (find it also attached to this post)

    #include <msp430.h>
    #include <stdint.h>
    #include "uart.h"
    #define LED1 BIT0
    #define LED2 BIT6
    #define BUTTON1 BIT5
    #define BUTTON2 BIT3
    static volatile bool r = false;
    static volatile bool l = false;
    int main(void)
       WDTCTL = WDTPW + WDTHOLD;  // Stop watchdog timer 
       BCSCTL1 = CALBC1_1MHZ;  // Initialize clock  
       P1DIR |= (LED1 + LED2); // Set BIT0 and BIT6 as output
       P1OUT &= ~(LED1 + LED2); // LEDs off
       P2REN |= (BUTTON1 + BUTTON2); // Select pull-up resitors por P2.3 and P2.5
       P2IE |= (BUTTON1 + BUTTON2); // Enabling Button interrupts
       P2IFG &= ~(BUTTON1 + BUTTON2); // Clear interrupt flags for the buttons
       uint8_t c;
          if(uart_getc(&c)) {
             if (c == 't')
                P1OUT ^= (LED2); // Toggle LED2          
          if (l)
                uart_putc('l'); // Send "left" command via UART
                l = false;
          if (r)
                uart_putc('r'); // Send "right" command via UART
                r = false;
    // Port 2 interrupt service
    #pragma vector=PORT2_VECTOR
    __interrupt void Port_2(void)
       if ((P2IFG & BUTTON2))
          P1OUT ^= LED1;  // Toggle LED1
          P2IFG &= ~BUTTON2; // Clear BUTTON2 interrupt flag  
          P2IES ^= BUTTON2; // Interrupt called on High-to-Low and Low-to-High 
          l = true;
       if ((P2IFG & BUTTON1))
          P1OUT ^= LED1; // Toggle LED1
          P2IFG &= ~BUTTON1; // Clear BUTTON1 Interrupt flag
          P2IES ^= BUTTON1; // Interupt called on High-to-Low and Low-to-High
          r = true;


    Later today, I will include the schematic and a guide with the steps for replicating the setup in case you want to build it. 


    Do you find the project interesting?






  • Create New...