Programming At90usb1287 via USBasp

Go To Last Post
7 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Hi does anyone have any info on the correct programmer connections for this AVR

 

I tested the USBasp with an Attiny and it reads/writes ok

 

I connected MOSI, MISO, RESET, SCLK,  VCC + GND to a at90usb1287 board with an 8mhz crystal and 22pf caps

but I can not get it to communicate with the chip

 

All that we see or seem, is but a dream within a dream

Last Edited: Tue. Jan 14, 2020 - 09:47 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

What software are you using? Are you getting an error message?

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Hi thanks for the reply, I am using Extreme Burner AVR I am new to AVR I only used Pic in the past

 

I just get "Power on failed, cannot communicate with chip"

 

If I wire the same setup to an Attiny it reads and writes fine, I can not seem

to find a circuit on the net showing the ISP connections for the AT90USB series chip to confirm they are correct

All that we see or seem, is but a dream within a dream

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

AT90USB1286 schematic is on page 37 with AVR ISP connector in page's lower right :

MT-DB-U6 User Guide by Justin Mattair

via AT90USB646 AT90USB1286 Atmel USB AVR Arduino compatible development board - Development Boards (MattairTech)

 

"Dare to be naïve." - Buckminster Fuller

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Many Thanks for the link and pinout, I think I have either fake or faulty chips.

 

I have another known working chip and tested with JTAG and it reads/writes fine, I swapped over the chip

and these chips are not working tried 3 from the same seller, are clone/fake Atmel chips common?

 

With JTAG I go no response from these chip's and no bootloader detection either

 

 

All that we see or seem, is but a dream within a dream

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Electronika wrote:
are clone/fake Atmel chips common?
Without inside knowledge (I'm not in, with, or at Microchip), no answer other than there are a few threads each year on counterfeit IC or grey market IC.

AT90USB1287 :

  • wafer fab - don't know where
  • assembled at four locations

Counterfeit devices usually have defects in marking on the package (label, dots/circles/etc in the epoxy)

Electronika wrote:
With JTAG I go no response from these chip's ...
The JTAG instructions for AVR programming are in the AVR's datasheet.

Electronika wrote:
... and no bootloader detection either
The USB DFU bootloader is programmed either at the assembly site or the testing site.

 


https://www.microchip.com/mymicrochip/Reports.aspx?type=cpn&filter=AT90USB1287

AT90USB1287 - 8-bit AVR Microcontrollers

 

"Dare to be naïve." - Buckminster Fuller

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

New Chips work fine, I think the other chips must be fake

 

All that we see or seem, is but a dream within a dream

Last Edited: Fri. Jan 17, 2020 - 01:51 PM