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TAP-HAT: Low-Cost Hardware Debugger for Raspberry Pi

By on April 7, 2019
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Tap-Hat is a multi-purpose JTAG debugger board for those developing software to run on Raspberry Pi: RTOSs, Linux and bare-metal code in particular.

The TAP-HAT has been designed to provide a straightforward fool-proof connection of external JTAG debuggers. Including popular hardware debuggers such as the Lauterbach TRACE32, Ronetix PEEDI, SEGGER J-Link and others.

TAP-HAT features include:

  • Low-cost multi-purpose JTAG debugger for Raspberry Pi boards
  • Optional add-on modules enable USB-connected debugging of Pi and/or UART debug output
  • Straightforward attachment of external JTAG debuggers to the Pi
  • Use with OpenOCD server running native on Pi to create a low-cost networked hardware debugger
  • Stackable reverse-HAT design allows concurrent connection of standard peripheral HATs
  • Redboot bootloader supports configuration of Pi JTAG pin map and high-speed serial debugging
  • Supports JTAG initiated system reset of Pi
  • Can be used for bare-metal applications, eCosPro RTOS applications, and other OSes such as Linux

Physically, it mates with the Raspberry Pi IO header, but extends away from the Pi (unlike a typical HAT which site over the Pi) to allow probing access to Pi components. Its stacking header allows further HATs to be connected over the Pi in the normal orientation.

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Further information can be found on TAP-HAT product’s page.

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