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AVR development board designed for ATMEL mega AVR, features the ATmega128 MCU, and integrates various standard interfaces, pretty easy for peripheral expansions.

ATmega128 development board

Overview


OpenM128 is an AVR development board that features a ATmega128 device as the microcontroller. It supports further expansion with various optional accessory boards for specific application. The modular and open design makes it the ideal for starting application development with AVR microcontroller.




What's On Board


ATmega128 development board on board resource

  1. ATmega128A-AU:the high performance AVR MCU which features:

    • Core: AVR 8-bit RISC

    • Operating Frequency: 16MHz Max

    • Operating Voltage: 2.7-5.5V

    • Package: TQFP64

    • I/Os: 53

    • Memories: 128kB Flash, 4kB SRAM, 4kB EEPROM

    • Communication Interfaces: 1 x SPI, 1 x TWI (I2C), 2 x USART, 8 x PWM, 8 x ADC

    • Debugging/Programming: JTAG/ISP



  2. AMS1117-3.3: 3.3V voltage regulator

  3. Power switch

  4. Power indicator

  5. LEDs: convenient for indicating I/O status and/or program running state

  6. User keys: for I/O input test and/or program control

  7. Joystick: five positions

  8. Reset button

  9. Crystal oscillator: 7.3728M & 32.768K

  10. Adjustable resistor: for LCD12864 contrast adjustment

  11. 16 I/Os interface: for connecting accessory boards which using I/O control, such as FT245 USB FIFO, 8 SEG LED, etc.

  12. 8 I/Os interface | 8-bit AD interface


    • for connecting accessory boards which using I/O control, such as 8 Push Buttons, Motor, etc.

    • there's also 8-bit AD interface can be used for AD testing


  13. 6 I/Os interface | USART0+AC+PWM3 interface


    • for connecting USART peripherals, such as RS232, RS485, USB TO UART, etc.

    • for connecting accessory boards which using PWM interface, also supports analog comparison through AC interface


  14. SPI+PWM0+T/C interface


    • for connecting SPI peripherals, such as DataFlash (AT45DBxx), SD card, MP3, etc.
      the SPI interface includes additional I/O pins (PWM, T/C as regular I/O) which can be used as controlling pins

    • for connecting accessory boards which using PWM interface, also supports frequency calculation through T/C interface


  15. I2C+PWM0/1 interface


    • for connecting I2C peripherals, such as I/O expander (PCF8574), EEPROM (AT24Cxx), etc.
      the I2C interface includes additional I/O pins (PWM as regular I/O) which can be used as controlling pins

    • for connecting accessory boards which using PWM interface


  16. USART1 interface: for connecting USART peripherals, such as RS232, RS485, USB TO UART, etc.

  17. 1-WIRE interface: for connecting 1-WIRE devices (TO-92 package), such as temperature sensor (DS18B20), electronic registration number (DS2401), etc.

  18. PS/2 interface: for connecting PS/2 keyboard and/or mouse

  19. Graphic multi-color LCD interface: for connecting 2.2 inch multi-color touch screen LCD which using SPI control

  20. Graphic dot matrix LCD interface: for connecting dot matrix LCD, such as LCD12864 (3.3V blue backlight)

  21. 5V DC jack

  22. Custom crystal socket

  23. VCC power input/output: usually used for power supply output, and/or common ground with other application board

  24. MCU pins connector: all the MCU pins are accessible on expansion connectors for further expansion

  25. ISP6 interface: for programming

  26. ISP10 interface: for programming

  27. JTAG interface: for programming/debugging

  28. LEDs jumper

  29. User keys jumper

  30. Joystick jumper

  31. PS/2 jumper

  32. LCD selection jumper


    • short the jumper to use dot matrix LCD

    • open the jumper to use multi-color LCD


  33. VCC selection jumper

  34. Crystal selection jumper


For jumper 28-31:



  • short the jumper to connect to I/Os used in example code;

  • open the jumper to connect to other custom pins via jumper wires.


 




Photos



AVR Development Board
OpenM128 Development Board

AVR Development Board
Connecting to touch screen LCD

AVR Development Board
Connecting to a debugger

AVR Development Board
Connecting to various peripherals

 

2.2inch 320x240 Touch LCD
Connecting to touch screen LCD

LCD12864-ST 3.3V blue
Connecting to dot matrix LCD12864

RS232 Board
Connecting to RS232 Board via UART

PL2303 USB UART Board mini
Connecting to USB UART Board via UART

 

FT245 USB FIFO Board
Connecting to USB FIFO Board via 16 I/Os interface

8 SEG LED Board
Connecting to 8-SEG LED via 16 I/Os interface

8 Push Buttons
8 Push Buttons on the 8 I/Os interface

AD Keypad
AD Keypad on the 8 I/Os interface

 

AT24CXX EEPROM Board
Connecting to EEPROM Board via I2C

PCF8563 RTC Board
Connecting to RTC Board via I2C

I2C cascading x3
Multi I2C peripheral Module connected to the I2C bus

AT45DBXX DataFlash Board
Connecting to DataFlash Board via SPI

 

Micro SD Board
Connecting to Micro SD Board

Connecting to any accessory board
Connecting to any accessory board you need


 



Note: The OpenM128 does NOT integrate any debugging function, a debugger is required.




Debugging/Programming Interfaces


The figures below show the header pinouts of JTAG, ISP10, ISP6 interface



Figure 1. 10-pin JTAG header pinout
10-pin JTAG header pinout

Figure 2. 10-pin ISP header pinout
10-pin ISP header pinout

Figure 3. 6-pin ISP header pinout
6-pin ISP header pinout




Development Resources




  • Related Software (AVR Studio4, etc.)

  • Demo Code (GCC AVR examples)

  • Schematic (PDF)

  • AVR Development Documentations (Datasheets etc.)


Wiki: www.utsource.net/wiki/OpenM128




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