Tiny USB programmer AVR microcontrollers AVRDUDE

USB programmer There are few components – the ATtiny45 microcontroller, two Zener diodes, a capacitor and several resistors. Of course, there are still connectors – USB plug and IDC-6 plug. Resistor R1 informs host about presence of USB device transmitting data in Slow mode.

The resistors R2 and R3 in combination with D1 and D2 provide maximum voltages on the 3.6 V, not 5 V, because the +5 V voltage on the bus causes SYNC errors. R4 … R6 resistors protect the programmed circuit from damage if it is powered by a voltage lower than 5 V.

JP1 jumper should be open. It is assumed only when you want to power up the USB chip. Obviously, you need to keep in mind the limitations of the maximum permissible load current and the voltage range provided by the USB.

AVR USB programmer schematic diagram

The whole programmer can be placed in a heat-shrink sleeve, but beforehand the microcontroller must be programmed. Microcontrollers provided in AVT sets are already programmed, but if you are building your own programmer, you have to do it yourself.

The microcontroller should be programmed in high-voltage mode because the zero line works like typical I / O. Such programmers have so called. parallel. However, you can do otherwise. Most programs do not allow the RST line to be disabled in SPI mode, but for example, AvrDude offers this capability. Using the Burn-OMat overlay, you can switch the RST line to I / O mode, only to enable Expert mode.

Configuring AVR Studio to work with USB tiny AVR Programmer:

From the “Tools” menu, select “Customize …”.
In the newly opened “Command” window, select the “Tools” tab.
We point to the “New” icon or press the “Insert” key.
We enter the name of the programmer, eg “USBtiny”.
In the “Command” window we indicate the path to “avrdude” (eg: C: WinAVR-20100110binavrdude.exe).
In the arguments window we specify the parameters: “-p m168 -c usbtinyp -P usb -U flash: w:” file. hex: a -U flash: v: “.hex file: a”, where “m168” is the type of processor.
In the “Initial directory”, enter the path to the file (note the final character “”)
We approve the changes with the “Close” button.

In order to program the microcontroller select the name of our programmer in the “Tools” menu (in this example it is “USBtiny”).

Configuring Bascom to work with USB tiny AVR Programmer:

From the menu select “Options / Programmer”.
Select “External programmer” from the drop-down list.
In the “Other” tab (at the bottom of the window) we give the path to “avrdude”.
In the parameter window, type “avrdude” -p m168 -c usbtiny -U flash: w: “{FILE}”: a -U flash: Where “m168” is the type of processor.

Programming with the F4 key or the “Program chip” icon.

Supported microcontrollers and their codes

ATmega128	m128
ATmega1280	m1280
ATmega1281	m1281
ATmega16	m16
ATmega162	m162
ATmega164	m164
ATmega168	m168
ATmega169	m169
ATmega2560	m2560
ATmega2561	m2561
ATmega32	m32
ATmega324	m324
ATmega328	m328
ATmega329	m329
ATmega3290	m3290
ATmega48	m48
ATmega64	m64
ATmega640	m640
ATmega644	m644
ATmega649	m649
ATmega6490	m6490
ATmega8	m8
ATmega8515	m8515
ATmega8535	m8535
ATmega88	m88
ATtiny12	t12
ATtiny13	t13
ATtiny15	t15
ATtiny2313	t2313
ATtiny25	t25
ATtiny26	t26
ATtiny45	t45
ATtiny85	t85

 

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