Waveshare DVK512 User manual

DVK512 User Manual

Contents
API Demo Code..................................................................................................................................................................................3
Demos................................................................................................................................................................................................. 3
3.2-inch LCD display switch to the HDMI display................................................................................................... 4
HDMI display switch to 3.2-inch LCD display......................................................................................................... 4
LED Demo..................................................................................................................................................................4
8 channel Logic Level Converter Demo.................................................................................................................... 5
74LVC8T245 Level Converter Demo........................................................................................................................5
Joystick demo............................................................................................................................................................. 6
Key Demo...................................................................................................................................................................6
Buzzer and PWM....................................................................................................................................................... 7
DS18B20 Demo..........................................................................................................................................................7
Infrared Remote Control............................................................................................................................................ 8
LCD1602 Demo......................................................................................................................................................... 8
PCF8563 RTC Demo..................................................................................................................................................9
PCF8591 AD/DA Demo...........................................................................................................................................10
Acceleration of Gravity and Magnetic Sensors LSM303DLHC.............................................................................10
L3G4200D Angle Sensor......................................................................................................................................... 11
Serial Port Demo (the serial port works as console debug output)..........................................................................12
Serial Port Demo (control peripherals via Serial port communication).................................................................. 14
GPS Demo................................................................................................................................................................ 15

API Demo Code
All the demo codes for Raspberry Pi and the corresponding Makefile are included in our
configured system image: /home/pi/DVK512/.
If you're using your own system instead, the demo code can be found here as well:
CD_DVK512_EN/Program/
Use the following command to compile the demo code:
Make
Demos
First write the system image we provide to your SD card, enter the system, and double click the
"LXTerminal" on the desktop.
Log in as root, enter username:
su
Then the password:
raspberry
Note:
All the demos are running under root account, in case you happen to get stuck or any error
occurred, it might be that you're not logging in as root.

3.2-inch LCD display switch to the HDMI display
(The default boot mode of the image we provided is booted from 3.2-inch screen, HDMI no
output. If you want to output from HDMI, you need to operate as following :)
On the LXTerminal, enter
HDMI-SYS-SHOW
The system will load the driver( wait several minutes), when finished, the raspberry pi will
re-boot automatically, after it re-booted, waiting more than 30 seconds, there will be
information display on the LCD screen, and enter into startx interface.
HDMI display switch to 3.2-inch LCD display
Insert the LCD to the Raspberry pi board (The pin 1 of the LCD needs to match with the pin 1
of the Raspberry pi)
For the 3.2inch RPi LCD V2 version, on the LXTerminal, please enter
LCD32-SYS-SHOW
For the 3.2inch RPi LCD V3 version, on the LXTerminal, please enter
LCD32-SYS-SHOW-V3
The system will load the driver for several minutes, after loaded, the raspberry pi will re-boot
automatically, and after re-booted, please wait for 30 seconds or more then there will be
information display on the LCD screen, and enter into startx interface.

LED Demo
On the LXTerminal, enter
LED_Test
The 8 LEDs should light up one by one.
Press "Ctrl+C" to end the demo.
8 channel Logic Level Converter Demo
1, Connect the 8 channel Logic Level Converter to the onboard 8I/Os connector (Note: The
VCC1 pinheader on the Logic Level Converter should connect to the 3V3 pinheader of the
8I/Os connector on DVK512);
2, Connect the Logic Level Converter VCC2 to the DVK512 onboard 5V pinheader via DuPont
wire;
3. Connect GND to GND;
Then open LED JMP jumper, and connect B0-B3 to LED0-LED3 via DuPont wire, open KEY
JMP jumper, and connect B4-B7 to KEY0-KEY3 via DuPont wire.
On the LXTerminal, enter
8-LOGIC
Press KEY0-KEY3 on DVK512, the related LEDs will light up, press “Ctrl+C“ to end the
demo.

74LVC8T245 Level Converter Demo
1, Connect the 74LVC8T245 Board to the onboard 8I/Os connector (Note: The VCCA
pinheader on the 74LVC8T245 Board should connect to the 3V3 pinheader of the 8I/Os
connector on DVK512);
2, Connect the 74LVC8T245 Board VCCB to the DVK512 onboard 5V pinheader via DuPont
wire;
3. Connect GND to GND;
Then On the LXTerminal, enter
74LVC8T245_Test
Open the Jumper Cap in LED JMP, then connect B0-B3 to LED0-LED3, then LEDs will be
blinking; then connect B4-B7 to LED0-LED3, then LEDs will be blinking. Press “Ctrl+C” to
end the demo
Joystick demo
(Note: When using the 3.2 inch LCD, the LCD will disturb P0 value read of the joystick, the
joystick program will disturb the LCD touch.)
Connect the Mix Board to the 8I/Os connector P0-P7,
On the LXTerminal, enter
JOYSTICK_Test
Press any key button or the joystick, LXTerminal will show the one had been pressed.

Key Demo
(Only for Raspberry Pi Model B+. The system will crash if run on Raspberry Pi Model B)
On the LXTerminal, enter
KEY_Test
Press any key button or the joystick, LXTerminal will show the one had been pressed.
Buzzer and PWM
Connect the Mix Board to the 8I/Os connector P0-P7,
On the LXTerminal, enter,
Buzzer_PWM_Test
The buzzer will sound with decreasing volume, until no sound.
DS18B20 Demo
Connect the DS18B20 to Mix Board, and then connect the Mix Board to the onboard 8I/Os
connector P0-P7.
On the LXTerminal, enter
modprobe w1-gpio
modprobe w1-therm
ls /sys/bus/w1/devices/
You will see a string like 28-000004379b6f, get the last 7 numbers and letters (They are

different for each DS18B20, in the writer’s case, it is 4379b6f).
Then enter:
DS18B20_Test 4379b6f
LXTerminal should print the temperature value.
Infrared Remote Control
Connect the LFN0038K (Infrared Receiver) to the Mix Board IRM connector, connect the Mix
Board to the 8I/Os connector P0-P7,
On the LXTerminal, enter
IRM
Press any key on the Infrared Remote Controller provided by Waveshare; The LXTerminal will
print the decoded infrared signal in hexadecimal format.
Press "Ctrl+C" to end the demo.
LCD1602 Demo
Connect the "LCD1602" to the LCD1602 connector.
On the LXTerminal, enter:
LCD1602_Test
LCD1602 will display characters. If there is no information, please adjust the potentiometer
until there is information displayed.

PCF8563 RTC Demo
Short the RTC JMP,
On the LXTerminal, enter:
i2cdetect -y 1
The LXTerminal will print the PCF8563's address, indicating that the PCF8563 has been
detected. It's 51 in the writer’s case.
The address might be different, depending on the Raspberry Pi's version and the concrete
configuration of PCF8563.
Then on the LXTerminal, enter:
modprobe i2c-dev
echo pcf8563 0x51 > /sys/class/i2c-adapter/i2c-1/new_device
hwclock –r (for reading the time info from the connected I2C RTC hardware) The LXTerminal
will print the time info of the PCF8563, which is different from the system time.
Enter:
hwclock –w (writing the Raspberry Pi system time info to the PCF8563)
Then:
hwclock –r
Now the time info of Raspberry Pi system and the PCF8563 have been synchronized.
hwclock –s (synchronize the system time and the hardware RTC)

PCF8591 AD/DA Demo
Firstly connect the PCF8591 module we provided to the I2C connector;
On the LXTerminal, enter
PCF8591-ADC
The LXTerminal will print AD Value read from ADC0-ADC3 (pinheader AIN0-ANI3 of
PCF8591 module), as the following figure:
On the LXTerminal, enter
PCF8591-DAC
The LXTerminal starts printing digital conversion value; AOUT pinheader of PCF8591 module
has a corresponding level variation
Acceleration of Gravity and Magnetic Sensors LSM303DLHC
Firstly open RTC JMP, exclude interference from RTC.
Connect the LSM303DLHC Board to DVK512 onboard I2C connector as figure below:

On the LXTerminal, enter:
LSM303
Z_A is acceleration in vertical gravity direction, the module will surely to be at equilibrium
state as long as the acceleration value of X_A and Y_A is 0; and equilibrium of object can be
tested based on this principle
North is the value gets from the test.
L3G4200D Angle Sensor
As the L3G4200D Board needs to use the SPI interface control, but the SPI interface was
occupied by 3.2 inch LCD, so to control the L3G4200D Board, it requires to enter HDMI
display mode to release the SPI interface occupied by the LCD first.

Unplug the 3.2 inch LCD, on the LXTerminal, enter
HDMI-SYS-SHOW
The system will load the driver (wait several minutes), and release the SPI interface occupied
by the LCD, when finished, the raspberry pi will re-boot automatically, after it re-boot, connect
the L3G4200D Board to the DVK512 SPI interface,
On the LXTerminal, enter
su
Then enter the password:
raspberry
Log in as root, and then on the LXTerminal, enter
L3G4200D
The program running and starts measuring the angular velocity, the greater the velocity, the
greater the angular speed.
Serial Port Demo (the serial port works as console debug output)
The image we provided is used by taking the serial port as a terminal debugging by default; in
order to make it convenient for those students who can also control the raspberry pi via serial
terminal even they don’t have a screen, firstly connect the DVK512 to the PC via a USB cable,
and install a driver. The simplest way is to find a ”Driver Genius Professional" software on the
web directly; this software will help you install the driver automatically. Or you can also use the
cp2102_Driver. Zip driver under directory "software" in the CD.

Short CP_TX and RX, CP_RX and TX of the UART_JMP.
Launch putty.exe under directory of “software”, select corresponding COM on”1”, and set
Baud rate as 115200 on ”2”, then click “open” on “3”;
Then enter the software, connect the raspberry pi to the electricity and start it, the software
terminal will display system information, and then appear a pop-up window for you to enter
user name and password;
User name: pi
Password: raspberry
Now you can enter the console terminal.

Serial Port Demo (control peripherals via Serial port communication)
The image we provided is used by taking the serial port as a terminal debugging by default; so
the serial port is occupied by the system, which cannot be worked as normal serial port,
When using LCD to display,
On the LXTerminal, enter:
DIS_UART-LCD
If use the HDMI output to display,
On the LXTerminal, enter:
DIS_UART-HDMI
The system restarts, disable the serial port to work as terminal debugging output, now it can be
used as a normal serial port.
Connect the DVK512 to the PC using a mini USB cable, open the serial port monitoring
software on another computer, select baud rate as 115200;
On the LXTerminal, enter
UART_Test
A string of words will be printed on the serial port monitoring software, and what you send
through the serial port monitoring software, what will be displayed on the serial port monitoring
software. Press "Ctrl + C" to end the demo.
If you want to turn on the terminal debugging output function of the serial port again, you can
re-enter the following command on the terminal:

When using LCD to display,
On the LXTerminal, enter:
EN_UART-LCD
when using HDMI output to display,
On the LXTerminal, enter:
EN_UART-HDMI
After entered, the system will reboot and turn on this function.
GPS Demo
The image we provided is used by taking the serial port as a terminal debugging by default; so
to control the peripherals, it needs to disable the debugging function of the serial port first;
When using LCD to display,
On the LXTerminal, enter:
DIS_UART-LCD
when using HDMI output to display,
On the LXTerminal, enter:
DIS_UART-HDMI
Then the system will reboot, the disabled serial port will work as terminal debugging output,
and can be used as normal serial port.
Connect the GPS module to the onboard UART interface and open UART JMP at the same time.

On the LXTerminal, enter below to set the baud rate (The baud rate will reset to the default
115200 when the system reboots):
stty -F /dev/ttyAMA0 38400
gpsd /dev/ttyAMA0 -F /var/run/gpsd.sock
The specific software of the Linux system can be used for GPS positioning;
On the LXTerminal, enter
cgps -s
Below positioning information will be generated: