Update LED usage - Githubissues

greatscottgadgets / apollo

microcontroller-based FPGA / JTAG programmer

BSD 3-Clause "New" or "Revised" License

61 stars 29 forks source link

Update LED usage #39

Closed mossmann closed 3 months ago

mossmann commented 6 months ago

Proposed plan:

~~LED A: USB switch is in Apollo/Saturn-V mode (see #38)~~
~~LED B: FPGA is being held offline~~
~~LED C: Saturn-V heartbeat~~
~~LED D: fault, e.g. FPGA failed to configure from flash~~
~~LED E: Apollo heartbeat~~

[proposal replaced by "Alternative scheme" in comment below]

All LEDs would change function temporarily if a pattern other than idle is in use. The idle pattern would restore the indications above.

martinling commented 6 months ago

Personally I would love it if the LEDs would stop flashing when nothing is happening (e.g. Apollo is idle and a bitstream is running OK). To me, flashing means something is wrong and it wants attention.

mossmann commented 6 months ago

Alternative scheme @martinling and I came up with:

LED A: power indication (always on in Apollo)
LED B: FPGA allowed online (indicates PROGRAM toggle)
LED C: FPGA has requested CONTROL port
LED D: USB switched to FPGA
LED E: flashing patterns (e.g. fault indication)

All LEDs would be off in Saturn-V mode except C flashes. This requires no change to Saturn-V.