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lekernel >
who would be interested in a small 2x HDMI input (720p60 unless there are signal integrity problems) daughterboard for the M1? I'm going to make some...
09:15
<
lekernel >
really simple thing: route HDMI signals to FPGA + DDC level conversion + 1 fader (using RC network for resistance measurement by the FPGA)
09:15
<
lekernel >
1-layer PCB
09:20
<
Fallenou >
with a HDMI phy ?
09:33
<
lekernel >
no, that will be in the FPGA
09:34
<
lekernel >
the only things I'm worried about are (1) there is no proper differential pair routing to the expansion connector on the M1 which may cause SI problems (2) there will be clock skew due to the lack of available GCLK pins
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09:41
<
Fallenou >
the electrical standard of HDMI is compatible with FPGA IOs ? (I have no idea)
09:41
<
Fallenou >
nice if it's the case
09:42
<
Fallenou >
oh it's TMDS
09:51
<
lekernel >
yeah, and you can also mess around with resistors and capacitors to convert LVDS/TMDS/LVPECL/etc.
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<
kristianpaul >
lekernel: you could use GLCK pin from memory card TP
15:07
<
kristianpaul >
as i did due all the limitations of expacion connector..
15:10
<
lekernel >
I want a plug-in, solderless board - and clock skew should be manageable anyway
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<
kristianpaul >
ah good
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<
rooi-oog >
Hi all. My question is not about milkymist but about lm32 and gcc.
16:18
<
rooi-oog >
I have an odd bug when I try to compile simple code such as:"while(1) if (gyro_ready) do_something; with lm32-elf-gcc -O9
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<
rooi-oog >
asm code is incorrect. Does anyone else got this bug?
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<
lekernel >
what gcc version?
16:31
<
rooi-oog >
lm32-elf-gcc (GCC) 4.5.3
16:33
<
rooi-oog >
Program goes into infinite loop without reading variable gyro_ready. .-O2 won't working too.Only -O1.
16:34
<
rooi-oog >
gyro_ready is external.
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<
lekernel >
guess it's not a bug but an optimization - did you declare gyro_ready "volatile"?
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<
rooi-oog >
THANKS A LOT!! I forgot to do it!!
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<
wpwrak >
looks familiar :)
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