Custom 328P-AU board not responding via ICSP

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I created a custom PCB based on a 328P. The design is mainly based on the Arduino Nano schematic (3.0). The boards have arrived some days ago, and I can't get avrdude to recognize them via USBASP (or any other mean for that matter). When trying to program the board is powered via the ICSP connector. What I have tried so far:

  • only soldering the essential components: CAPs for 5V rail
  • soldering the Oscillator or leaving it off
  • on one board I even cut all lines except 5V, GND, RST and SPI.

Still the 328p won't respond, all I get is :

#avrdude -u -c usbasp -P COM1 -b 57600 -B 0.5 -p m8 

 WARNING: Unable to detect MCU
 avrdude.exe: set SCK frequency to 1500000 Hz
 avrdude.exe: error: program enable: target doesn't answer. 1 
 avrdude.exe: initialization failed, rc=-1
         Double check connections and try again, or use -F to override
         this check.
 avrdude.exe done.  Thank you.

I will attach my schematics and my board design, I know it is not the cleanest for now... It is my first one and I am currently trying to clean it up/make it better. I also added 1k resistors in line to RX and TX, but they are not present in the board design for now.

I am thankful for any help and/or advice

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wrong port? are other devices responding if you connect them over ISP ?

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I tried the same with an arduino nano and with an 328P DIP chip (w/o crystal), both worked flawlessly

SOLVED IT: the speed was set way to high, set it to 8k solved it:)

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