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Yes—you can program this board. You have two options wired to the ATmega1284P:
  1. JTAG for full debug via J1
  • Target: U4 (ATmega1284P) JTAG pins are already connected.
  • Typical tool: Atmel-ICE or compatible JTAG programmer/debugger.
  • J1 pin map (from your schematic):
    • 1 TCK → U4 PC2
    • 5 TMS → U4 PC3
    • 3 TDO → U4 PC4
    • 9 TDI → U4 PC5
    • 6 nSRST → U4 ~RESET
    • 2/10 GND → GND
    • 4 VREF → Target VCC sense (board 5 V rail)
    • 7 VCC → Board 5 V rail (do not back-power unless your programmer supports/you intend to)
  1. AVR ISP (2×3) via J2
  • For bootloading/flash programming (no on-chip debug).
  • J2 pin map (as wired in your design; series protection resistors inline):
    • 1 → U4 PB6 via R3
    • 3 → U4 PB7 via R2
    • 4 → U4 PB5 via R1
    • 5 → U4 ~RESET
    • 2 → VCC (target 5 V reference)
    • 6 → GND
Power during programming
  • The MCU VCC is on the 5 V rail (Net 1). You can power the board from its normal supply (for example the 12 V input at 12V / 12Vp through the regulators), or let your programmer power the target if it supports it. Ensure the programmer’s VTref matches your target voltage (5 V here), and avoid back-powering both ways at once.
Which should you use?
  • Use JTAG on J1 if you want breakpoints, single-step, and full debug.
  • Use ISP on J2 for quick firmware flashing/bootloader work.
If you want, I can also label the J2 pins on your silkscreen or add a keyed box header to make cable orientation fool-proof.
Silkscreen J2 pins
Select keyed ISP header
Add 5 V indicator LED
Define JTAG net class
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U3
IFQ
IFI
Freq_Tune
ANT_RX
ANT_TX
2V5
3V3
ANT_TX
Temp_Voltage
ANT_RX
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RADAR PCB Patch antenna Board

RADAR PCB Patch antenna Board
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Last updated by roytaylor
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roytaylor

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