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VX-Mega128 : ATmega 128 Mic roc ontroller boa rd d oc umenta tion 1

VX-Mega128

ATmega128 Mic rocontroller board

1. Features

Sup port the ATmeg a128 with Flash mem ory of 128KB. Cloc k rate 14.7456MHz

34 I/ O p ort of microc ontroller are using INEXs standard PCB-3 p in co nnec tor.

LCD16x2 module

4 of Button switches

Binary Switc h

USB po rt w ith FT232RL USB to Seria l c onverter c irc uit.

ATmega 128 pre-prog ram med Boot loader, prog rammable via USB po rt.

8-ch. Analog input with 10-bit Analog to Digital Converter

32KB RAM / 32KB EEPROM mem ory module p lug on top

Support In-system Programming via ISP connec tor with PX-400 Programmer

Supply voltage +9V from external. +5V 500mA o n-board regulato r.

Inc ludes : ATmeg a128 Mic roc ontroller board, Pluga ble Memory module, USB cab le, CD-

ROM and Documentation.

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VX-Mega128AVR MicrocontrollerPart 1 : Main section

4

IC2

ATMEGA128-16

3V317

Vcc

C20.1F16V

TES26

AGN25

GND7

GND18

GND21

1TxD

5RxD

32PD7 (T2)

55

54

57

56

59PF2 (ADC2)

58PF3 (ADC3)

61PF0 (ADC0)

60PF1 (ADC1)

PF6 (ADC6/TDO)

PF7 (ADC7/TDI)

PF4 (ADC4/TCK)

PF5 (ADC5/TMS)

GND

SDA

RD

A9

A11

A13

A15

ALE

AD6

AD4

AD2

AD0

+5V

GND

SCL

WR

A8

A10

A12

A14

RST

AD7

AD5

AD3

AD1

+5V

+5V

WR

RD

A15

A14

A13

A12

A11

A10

A9

A8

AD7

AD6

AD5

AD4

AD3

AD2

AD1

AD0

ALE

+5V

AVcc

GND

ADC0

ADC2

ADC4

ADC6

64AVcc

62AREF

+5V

PD0(SCL/INT0)

PD1(SDA/INT1)

PD2(RXD1/INT2)

PD3(TXD1/INT3)

PD4(ICP1)

+5V

PB5(PWM5)

PB6(PWM4)

PB7(PWM3)

PE3(PWM2)

PE4(PWM1)

PE5(PWM0)

R547

18

19

RTCX1

RTCX2

XTAL232.768kHz

23

24

X1

X2

XTAL114.7456MHz

PG0(WR)

PG1(RD)

PC7(A15)

PC6(A14)

PC5(A13)

PC4(A12)

PC3(A11)

PC2(A10)

PC1(A9)

PC0(A8)

PA7(AD7)

PA6(AD6)

PA5(AD5)

PA4(AD4)

PA3(AD3)

PA2(AD2)

PA1(AD1)

PA0(AD0)

PG2(ALE)

33

34

42

41

40

39

38

37

36

35

43

44

45

46

47

48

49

50

51

EN

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

R/WR

SVee

Vcc

GND

LCD Module

16 Char. x 2 Lines

31PD6 (T1)

30PD5 (XCK)

65 10

7 12

11

14

13

PE4(OC3B/INT4)

PE3(OC3A/AIN1)

PB0(SS)

PE5(OC3C/INT5)

PB2(MOSI)

PB1(SCK)

PB4(OC0)

PB3(MISO)

16

15

17

PB6(OC1B)

PB5(OC1A)

PB7(OC2/OC1C)

23

PE0(RXD0/PDI)

PE1(TXD0/PDO)

1

PEN

PB0(SS)

PB1(SCK)

PB2(MOSI)

PB3(MISO)

PB4(OC0)

29PD4 (ICP1)

28

27

26

25

PD3 (TxD1/INT3)

PD2 (RxD1/INT2)

PD1 (SDA/INT1)

PD0 (SCL/INT0)

RST20

RST

C722pF

R92.2k

R82.2k

VR110kLCD

CONTRAST

+5V

21

Vcc

52

Vcc

GND22

GND53

GND63

+5V

R610k

(Optional)

to I/O section

R710k

+5V

S1

RESET

K3

ISP : In-SystemProgramming

PORT

GND

Vcc

GND

GND

GNDMISO

MOSI

RST

SCK

C10.1F16V

C30.1F16V

C40.1F16V

JP1AVcc

K2ADC po

C50.1F16V

C60.1F16V

C822pF

C90.1F16V

DSP1K4

ATmega128EXPANSION BUS

Figure1

Microcontrollerscetiob

sche

matiucdiagramofVX-M

ega128board

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+5V

Y0

Y1

Y2

Y3

Y4

8

A0

A1

A2

CS35

3

2

1

11

12

13

14

15

0xF800 WR - PORT D.OUT

0xF400 RD

0xF400 WR

0xF000 RD

16

0xF000 WR

IC374AC138

Y5

Y6

Y77

910 0xF800 RD - PORT D.IN

0xFC00 WR

0xFC00 RD - SWITCH

R12-R19

150 x 8

2

3

4

5

6

7

8

9

19

18

17

16

15

14

13

12

D0

D1

D2

D3

D4D5

D6

D7

Q0

Q1

Q2

Q3

Q4Q5

Q6

Q7

11 1LE OE

IC574AC573

10GND

+5V

20

D.IN0

D.IN1

D.IN2

D.IN3

D.IN4

D.IN5

D.IN6

D.IN7

R1010k*8

+5V

D.OUT0

D.OUT1

D.OUT2

D.OUT3

D.OUT4

D.OUT5

D.OUT6

D.OUT7

+5V

2

3

4

5

6

7

8

9

18

17

16

15

14

13

12

11

I0

I1

I2

I3

I4I5

I6

I7

D0

D1

D2

D3

D4D5

D6

D7

1OE1

IC474AC541 19

OE210

GND

+5V

20

SW1

2

3

4

5

6

7

89

18

17

16

15

14

13

1211

I0

I1

I2

I3

I4

I5

I6

I7

D0

D1

D2

D3

D4

D5

D6

D7

1OE1

IC674AC541

19OE2

10GND

+5V

20

1

4

3

6

D0

D1

D2

D3

2

5C0

C1

R2010k*8S2

BINARY

SWITCH

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

AD0

AD1

AD2

AD3

AD4

AD5

AD6AD7

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

R1110k*8

31

2

89

10

A12

A13

6

4

5

RD

WR CS16

CS24

1112

13

A14

A15

+5V

14

7IC4

74AC00

WR

A10

A11

to MAIN section

IC778R05

J1

DC.input6-12V

C151000F

6.3V

+5V

S3

ONBD1

1A50V

GND

OUT

IN SHDN

LED3

POWER

R21510

VX-Mega128AVR MicrocontrollerPart 2 : I/O sectionand power supply

C10

0.1F50V

IC4/1

IC4/2

IC4/3

C110.1F

50V

C13

0.1F

50V

C12

0.1F

50V

IC4/4

R12

R13

R14

R15

R16

R17

R18

R19

SW2 SW3 SW4

C14

220F

25V

C16

220F25V

Figure 2 I/O port and external device interface schematic diagram of VX-Mega128 microcontroller board

2 . C irc u it a nd M e m ory m a p

The VX-Meg a128 mic roc ontroller board schem atic d iagram is sp lited to 3 sec tions.

The microc ont roller sec tion sc hem atic d iagram is show n in figure 1. Input/ Output port

and external device interface schematic diagram is shown in figure 2 and figure 3 shows

the circuit of Memory extension module.

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4VX-Mega128 : ATmega 128 Microc ontroller boa rd d oc umenta tion

ATme ga 128 op erates with c loc k freq uenc y 14.7546MHz from external c rysta lc ircuit. The c rysta l 32.768kHz is connec tede to ATmeg a128 for set ting the c lock freq uenc y

to support internal Rea l-time counte r. Supp ly voltag e +5V comes from external DC a daptor

+9V (+16V ma ximum) via +5V reg ulator c irc uit with 78R05 ICs.

VX-Meg a 128 sup p orts b ot h in Sing le c hip m icroc ont rol ler mo d e a nd

Microp roc essor mo d e. ATme ga 128 interfac es with a ll external d evice via a d d ress

assignment. In figure 4 shows the memory and I/O map of VX-Mega128 board.

External device tha t c onnec ted with ATmega 128 are a ssigned in a ddress F000H

to FFFFH inc luded :

(1) LC D m od ule 16x2 : connec t 8-bit data bus with AD0 to AD7 of ATmega 128.

It causes reading and writing via data bus instead direct interface.

(2) 4 of Input Switches (SW1 to SW4) : address at upper nibble of FC00H.

Signa l is buffered via 74AC541 IC.

(3) 4-bit binary Switch : trhis switch g ives 4 bina ry bits. It mea ns 16 d ifferent

da ta 0000 to 1111 in binary base o r 0 to 15 in dec ima l and 0 to F in HEX. Data from Binary

switch are tranfered to data bus ; AD0 to AD3 via 74AC541 buffer IC and assigned at

lowewr nibble of FC00H.

GND

SDARD

A9

A11

A13

A15

ALE

D6

D4

D2

D0

+5V

GND

SCLWR

A8

A10

A12

A14

RST

D7

D5

D3

D1

+5V

A0

A1

A2

A3

A4

A5

A6

A73

4

5

6

7

8

9

10

A8

A9

A10

A11

A122

23

21

24

25

19

18

17

16

15

13

12

11

27WR

OE22

D7

D6

D5

D4

D3

D2

D1

D0

CE20

A13

A141

26

12

+5V

24

+5V

D0

D1

D2

D3

D4

D5

D6

D7

11LE

20

OE

1 10

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q712

13

14

15

16

17

18

19

A7

A6

A5

A4

A3

A2

A1

A0

9

8

7

6

5

4

3

2

AD7

AD6

AD5

AD4

AD3

AD2

AD1

AD0

IC974AHC573

IC10SRAM62256

(32K x 8bit)

A0

A1

A2

A3

A4

A5

A6

A7

A8

A9

A10

A11

A12

WR

RD

A15

A13

A14

ALE

AD7

AD6

AD5

AD4

AD3

AD2

AD1

AD0

K4ATmega128

EXPANSION BUS

+5V

+5V

A0

A1

A2

WP

8

Vcc

SCL

SDA5

6

7

3

2

1

GND4

IC824C256

(32K x 8bit)

C18

0.1F50V

C190.1F50V

C170.1F50V

Figure 3 Data memory extension module schematic diagram

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Also the digital input and output port of VX-Mega128 board are assigned via

address map system as follows :

Digital input port D.IN0 to D.IN7 are assigned at F800Haddress.

Digita l outpu t po rt D.O UT0 to D .O UT7 are assigned at F800H address too.

but active with WR signal insterad.

All interface port include Analog to Dital converter module input are connect to

INEX 3-pin PCB connector. User can connect with INEX many sensors and modules.

VX-Mega128 board supports 8-channel of Analog to digital converter. User can

select supply voltage and reference for ADC module with 2 jumpers JP1 and JP2. If fit

all, selects ADC module to use supply and reference voltage at +5V. If remove all, user

c an ap ply the vo ltage a t these p oints. The limita tion is refe renc e vo ltage must low er or

equal the supply voltage of ADC module. Normally, fit both jumpers on the board.

Comp uter interfac e o f VX-Meg a128 board via USB. The hea rt o f this func tion is

FT232RL the USB to Serial conve rter c hip. Thus, interface signal is seria l and conne c t to

UART1 module in ATmeg a128. The prog ramming sha ll be easier and supports a ll mo dern

computer includes labtop which not serial port available.

Ad d ition user ca n prog ra m m icroc ont rollers fla h me mo ry via USB inte rfac e.

Bec ause ATmega 128 microcontroller will be pre-prog ram med the bo otload er rea dy. It

means this microc ontroller ba ord c an prog ram the flash 2 ways. One is via ISP connec torwith exte rnal In-System Programmer suc h as PX-400. Another is via USB with bootloa der

(Atmega128 must pre-rpogrammed ready).

0000H

7FFFH

8000H

FFFFH

0FFFH

1000H

ATmega128

EFFFH

F000H

R/W = "0"Write mode

Not used

Not used

FFFFH

Not used

SwitchInput

F000H

F3FFH

FC00H

F800H

FBFFH

F400H

F7FFH

F000H

F3FFH

FC00H

FFFFH

F800H

FBFFH

F400H

F7FFH

Not used

Not used28KB from 62256external RAM

Not used

Internal 4KB ofATmega128

I/O address

Digital portdata Output

Digital portdata Input

R/W = "1"Read mode

Figure 4 Memory and Input Output port organization of VX-Mega128

micrcocontroller board

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3. How to p rog ra m the VX- M e ga 128 boa rd

Flash prog ramm ing ATmega128 on VX-Meg a128 board has 2 method s.

(1) via ISP co nnec tor with e xte rna l In-Syste m Prog ra m m e r : The suggession

programmer is INEXs PX-400 amd Atmels AVR ISP In-System Programmer

(2) via USB with b oo tloa d e r : This method ATmega128 must p re-prog ramm ed

bootloader firmware. INEX prepare ready to using. However user can re-program the

bootload er with yourself by external programmer via ISP connec tor. In CD-ROM conta in

the HEX file o f this boo tloa der. On VX-Mega128 boa rd has FT232RL USB to Serial converter

chip to interface the USB but in software will loo k as COM port. Signa l from FT232RL are

c onnec ted to SPI p rogramming p in PDI (PE0) and PDO (PE1) of ATmega128. With this

me thod , user no ne ed the external p rog ramer to flash p rog ram ming. Only plug USB

cable between baord and computer. Open the suitable software. You can work with

this microcontroller board.

4. Extension memory board

The mem ory b oa rd o f VX-Mega128 is 64KB. Divides 2 parts. One is Sta tic RAM 32KB

; 62256. However user can work only lower 28KB. Because upper 4KB is reserved by

internal RAM d a ta me mo ry of ATme g a 128. Inte rfa c ing of t his RAM wo rk via the

EXPANSION BUS. This bus provides 8-bit data /address lines; AD0 to AD7 and Ad dress line

A8 to A15, and a ll control signal.

Another memory part is seria l EEPROM 32KB; 24C256. ATmeg a128 inte rfac es via

I2C bus or Two-Wire Interfac e (TWI).

If you need to use this memeory board with VX-Mega128 board, must plug this

module on top at EXPANSION c onnec tor.

5. Software in VX-Mega128 board

The related softwa re work with VX-Meg a128 mic roc ont roller board that suggessionhas 4 softwares as follows :

(1) IDE development tool - introduce AVR Studio . It support both Assembly

and C programming. Download the latest version at w w w . a t m e l . c om

(2) C compiler - suggess WinAVR. It is powerful GCC c ompiler and imp ortant

Free of c harge. It c an wo rk with AVR Stud io. User ca n deve lop C p rog ram und er AVR

Stud io an d u se WinAVR to c om p i le. Dow nloa d t he lat est ve rsion a t h t tp : / /

so u rc e f o rg e . n e t/ p r o je c t s/ w i n a v r

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(3) Flash programming software - suggess 2 softwares; AVR Prog and AVR-

O SP II. The AVR Prog will insta ll with AVR Stud io. Avr-Osp II is sep arated . But user ca n a dd

Avr-OSP II into AVR Stud io for easier to using. Downloa d the late st version a t http :/ /

esnips.com/web/AtmelAVR

(4) Boo t loader - It is sma ll firmwa re that p rog ram into Flash prog ram mem ory

of ATme ga 128. Its func tion is write the HEX cod e with itself via c ontrolling from computer

via seria l p ort. Prog ram ming this c od e into ATmga 128 must use e xterna l In-Syste m

Programmer in first time. However the manufacturer pre-program the bootloader ready.

The insta lla tion m ust d o fo llow ing these step as follow s

(1) Insta ll AVR Stud io

(2) Install WinAVR compiler

(3) Install Virtual COM port (VCP) driver

(4) Install Avr-Osp II software if require

5.1 A V R Stud io insta lla tio n

5.1.1 Insert the AVR CD-ROM and look for th is file in the AVR Stud io d irec to ry;

aStud io4b460.exe. Doub le-c lick this file.

5.1.2 Enter the Installation Wizard. Click on the Next button to continue.

5.1.3 In the license a greement w indow, Selec t the box : I ac ce pt the te rm s of the

l icense agreement and Click on the N e x t button.

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5.1.4 Choose Destination Location windows will appear. You can change the

pa th by c licking on the C h a n g e button and setting a new path. After this, click on the

N e x t button.

5.1.5 The Driver USB Upgrade w indow will now a ppea r. Click on the N e x t button

to pass this step.

5.1.6 In the beg in insta lla tion w indow , c lick on the Insta ll button to sta rt insta lla tion.

5.1.7 After the installation is complete, click on the Finish button to end the

insta lla tion of AVR Studio.

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5.1.8 Next step is updating the software with service pack 4. Open CD-ROM .

Enter to Software folder AVR Studio 4.12. Loo k for this file in the Update fo lder ;aStudio412SP4b497 .exe . Doub le-clic k this file. The we lco me insta lla tion w indo ws will

appear. Click the N e x t button to continue.

5.1.9 The Selec t Fea tures wind ow appea r. Clic k the Next but ton to insta ll theupdate files.

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5.1.10 The Setup Sta tus window a ppea r and shows the insta lla tion p rogress bar.

Wait until finish.

5.1.11 After installation complete, click the Finish button.

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5.2.3 The Welc om e insta l la tion soft w a re w indo w a p p ea rs a nd sho ws the

installation information. Click on the N e x t button.

5.2.4 In the License agreement window, Click on the I agree button.

5.2.5 Choose Install Location window appears. User can change the path and

the folder for the installation of WinAVR by clicking at the Browse button and selecting

the respec tive folde r. The p rop osed folde r is C :\ W in A V R . After selection, click N e x t

button to continue to the next step.5.2.6 In the Choose Components window, select the components which you

want to install or follow according to the below diagram. Click on the Insta ll button to

begin the installation.

5.2.7 The insta lla tion process sta rts and reports the sta tus bac k on the sc reen. The

User needs to wait until the installation is complete. Click on the Finish button to end

once its done.

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5.3 Insta ll V irtua l C O M p o rt (V C P) d rive r

5.3.1 Connec t USB cable b etw een VX-Mega128 boa rd and computers USB po rt.

Put the ACR CD-ROM in CD-ROM drive. Apply the supply voltage to VX-Mega128 board.

5.3.2 Computer will detect the new hardware.

5.3.3 After that the New Hardware w indow app ea r. Selec t Insta ll fro m a list orspe c i fic loc a tion (Adva nce d) header and click the Next > button to continue.

5.3.4 Next, click to select at Search for the best dr iver in theses locat ion and

Include this location in the search header. After that click Browse button to looks for

Driver direc tory in CD-ROM. The driver file will co nta in infolder USB-VCP_driver WinNT_XP

Click the N e x t button to continue.

5.3.5 All driver files will install to computer.

5.3.6 The USB High Speed Seria l Converter insta lla tion c om plete window appea r.

Click the Finish button. USB ind icator on VX-Mega128 boa rd lights.

5.3.7 Wait a moment, the Virtual COM port installation driver window will appear.

Selec t Install from a l ist or specif ic location (Advanced) header similar step 5.1.3.3 and

click the Next > button.

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5.3.8 Selec t Se a rc h for the b e st drive r in the se s loc a tion and Include this loc a tion

in the search header. Click Browse button to looks for Driver directory in CD-ROM. Must

select the same destination from step 5.1.3.4. Click the Next > button to continue.

5.3.9 All driver files will insta ll to c omputer.

5.3.10 The USB Serial po rt insta lla tion c om plete windo w a ppea r. Click the Finish

button to finish installation.

5.3.11 After installation complete, user can check the position of the Virtual COM

port or USB Serial port. Open Contro l Pane l. Selec t System H a r d w a r e D e v i c e M a n a g e r and see Port (C O M & LPT). You will found USB Se ria l Port position. Remeber it

for interfacing later.

6. F lash programming on VX-Mega128 board

6.1 V ia USB p o rt w ith Bo o tlo a d e r

6.1.1 Apply the supply voltage in range +6 to 12Vdc to VX-Mega128 board. Press

the SW1 switc h and turn-on power switc h. The green POWER LED lights. Release the SW1.

At LCD screen shows message below :

VX-Mega128VX-Mega128VX-Mega128VX-Mega128VX-Mega128Run > BootloaderRun > BootloaderRun > BootloaderRun > BootloaderRun > Bootloader

Now the VX-Mega128 board enter to Bootloader mode. Ready for flash

prog ramm ing via USB port.

6.1.2 Connec t USB cable be tween PC s USB port and VX-Meg a128 board. Chec k

the USB Seria l po rt p osition from Device Ma nager follow ing the figure 5.

6.1.3 Open AVR STudio to d eve lop C p rog ram and com pile to HEX file rea dy.

F:\VX-M128v070101\USB-VCP_Driver\WinNT_XP

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6.1.4 At menu, selects Tool Program AVR Connect . . . following the illustratedbelow fo r sett ing the VX-Mega128 baord to connec t with AVR Stud io.

Figure 5 The Device Manager window shows the USB Serial port that installed

in computer

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6.1.5 The Selec t AVR Prog ramm er windo w appea rs below.

Set a ll pa rameter as follow s

Pla tfo rm : STK500 or A V RISP

Po rt: C O M 2 (the USB Seria l port p osition tha t set by c om pute r)

Click on the Connect button to connecting.

6.1.6 The AVRISP windo w appea rs below.

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Set a ll pa rameter as follows

De v ic e : A tm e g a 128

Pro g ra m m ing m o d e : ISP m o d e

Fla sh : Inp ut He x File

After that click on the Browse button to select HEX file which required to

download. Example f i le is V X 1 2 8 _ D m . H E X . Its path is C : \ D o c u m e n ts a n d

Se t tin g s\ A d m in istra to r\ D e sk to p \ V X 1 2 8 _D m \ d e fa u lt (The result file - HEX file from

compiler will be store in default folder)

6.1.7 Click on the Program button in Flash hea der for downloading VX128_Dm.HEX

file to Atmega128 microcontroller on the VX-Mega128 board.

The prog ramm ing step s are :

6.1.7.1 Erase

6.1.7.2 Program the HEX file. It is VX128_Dm.HEX file.

6.1.7.3 Verify programming

At AVRISP window w ill show the sta tus a t the bot tom left c orner of AVR

Stud io ma in w indow. Until the donwloa d finish, sc reen w ill show the me ssage Leaving

p r o g r a m m i n g m o d e . . O K !

6.1.8 Now the flash programming ready. Press RESET switch to run the program.

Observe the operation of VX-Mega128 board.

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6.2 With PX- 400 p rog ra m m e r via ISP c onne c tor6.2.1App ly the supp ly voltage during 6 to 12Vdc to VX-Mega128 board. Turn-on

power switch. The green POWER indic a to r lights.

6.2.2 Co nne c t PX-400 betwe en Seria l port and ISP c onnec tor on VX-Meg a128

boa rd. If your com pute r has only USB port, the USB to Seria l port c onverte r req uired . The

UCON-232S is rec ommended . See the d iagram in figure 5.

6.2.3 Open AVR STudio to d eve lop C p rog ram and com pile to HEX file rea dy.

6.2.4 At menu, Selec t Tool AVR Prog...

PX-400

ISPRS-232

VX-Mega128

DC

input

UCON-232S

CX-4 cable

CX-4 cable

Connect to USB port in casePC has only USB

USB to Serial portconverter

Connect to Serialor COM port

Figure 5 The diagram of Flash programming via ISP connector with PX-400

programmer

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6.2.5 The AVRprog window appea r.

6.2.6 For first time using AVRProg program, developer must set some parameter

of flash programming fo r AVR Prog. The step is as follows :

6.2.6.1 Dev ice box select A Tm e g a 1 2 8

6.2.6.2 Click on the A d v a n c e . . button. The Adva nce window ap pear.

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6.2.6.3 Set a ll parameters identic a l the illustrate in step 6.2.6.2. After tha t

c lic k on the Write b utton once for writing the parameters. Theses parameters will store

and set to default value for next working.

6.2.6.4 Click on the Close button to exit this window.

6.2.7 Back to the m ain w indow of AVRProg , at He x file bo rder, c lic k on the Browse

button to find the HEX file. For example, load file V X 1 2 8 _ D m . H E X from this path

C : \ D o c u m e n ts a n d Se t tin g s\ A d m in istra to r\ D e sk to p \ V X 1 2 8 _D m \ d e fa u lt

6.2.8 Click on the Program button in Fla sh border. The prog ress bar will ac tive to

shows the progress status.

6.2.9 After downloading finished, the program will run immediately. The file

VX128_Dm.HEX is Hardware testing program for VX-Mega128 board.

6.3 How to program bootloader with your own.

If you make the flash prog ramming of the VX-Mega 128 board with the external In-

System Prog ramm er, possib le to delete the Boo tloader firmw are. If you need to prog ram

Flash memory with bootloader again.Your can re-program the bootloadr by your own

with the externa l programme r via ISP c onnec tor.

The bootloder HEX file is VX -M 128_Boo t.HEX. It is c onta ine d in fold e r Boo tloa de r in

CD-ROM that bundled with VX-Mega128 set. Programming procedure is similar the flash

programming with ant HEX file with extrernal programmer.

After the bootloa der is programmed rea dy, you c an program ATmega 128 flash

memory with Bootloader procedure at topic 6.1

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7. Summary of Teting f i le of VX-Mega128 board

The VX128_Dm.HEX is HEX file for te sting the o perat ion o f VX-Me ga128 boa rd.

Normally, maker will pre-programmed ready to test. In first time operation, after apply

the supply voltage. LCD screen on the board will show this message :

VX-Mega128VX-Mega128VX-Mega128VX-Mega128VX-Mega128

Run > User codeRun > User codeRun > User codeRun > User codeRun > User code

and c hange to

VX-Mega128VX-Mega128VX-Mega128VX-Mega128VX-Mega128

DemoDemoDemoDemoDemo

Afte r tha t MCU will rea d d ata from 4-bit Binary Switc h to d isp lay on the LCD sc reen.

The b inary switch c an supply 4-b it d igita l da ta and is ca lled Knob . User ca n c hange the

shaft at Binary switch and see the correct position.

Summ ay of a ll functuion c an show as follows :

0 : Disp lay the Knobs va lue 000 on LCD16x2 mo dule

1 : Testing the switc hes SW1 to SW4

2 : ADC m od ule testing

3 : Test D.IN0 to D.IN7 inp ut d igita l po rt

4 : Test the D.OUT0 to D.OUT7 for output port

5 : Read port B (PB0 to PB7)

6 : Read port D (PD2 to PD4)

7 : Read port E (PE2 to PE7)

8 : Test the RAM on the m emory extension module (must p lug the memory

boa rd on top of VX-Mega128 board at EXPANSION c onnector).

9 : Test the EEPROM on the m em ory extension mod ule (must p lug the memory

boa rd on top of VX-Mega128 board at EXPANSION c onnector).

A : Disp lay the Knobs va lue 010 on LCD16x2 mod ule

B : Disp lay the Knob s va lue 011 on LCD16x2 mod ule

C : Disp lay the Knobs va lue 012 on LCD16x2 mo dule

D : Disp lay the Knobs va lue 013 on LCD16x2 mod ule

E : Disp lay the Knob s va lue 014 on LCD16x2 mo duleF : Disp lay the Knob s va lue 015 on LCD16x2 mod ule

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www.inex.co.thwww.inexglobal.com

8. Resource

All sourcec od e in C prog ram is conta ined in Examp le c od e > VX128_Dm. You c an

see and edit by your own to make the new code.

For more informa tion of ATme ga 128 mic roc ontroller, c an see and d ow nloa d

datasheet and many applicatiobn notes from www.atmel.com.

Spec ia l thanks for

1. Atmel Corp. ab out the perfec t IDE softw are; AVR Stud io.

2. Many people who develops the nicely C compiler in name WinAVR.

Documents

Vx Mega128 e