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Hi Jef,<br/>
<br/>
Thanks for the reply and guidance.</span></body><body><span style=" font-family:'calibri'; font-size: 12pt;"> </span></body><body><span style=" font-family:'calibri'; font-size: 12pt;">I'll try another USB powered hub.<br/></span><span style=" font-family:'calibri'; font-size: 12pt;">
</span><span style=" font-family:'calibri'; font-size: 12pt;"><br/></span><span style=" font-family:'calibri'; font-size: 12pt;">
Kind regards,</span><span style=" font-family:'calibri'; font-size: 12pt;"><br/></span><span style=" font-family:'calibri'; font-size: 12pt;">
Stuart Burton</span><span style=" font-family:'calibri'; font-size: 12pt;"><br/></span><p><span style=" font-family:'calibri'; font-size: 12pt;"> </span></p><p><span style=" font-family:'calibri'; font-size: 12pt;"><xhtml><head> <style title="rt_noDelete" type="text/css">
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</style></head><xbody></xbody></xhtml></span></p><blockquote class="Odd QOdd rt" prefix="> ">On 5/10/2024 14:45, Stuart Burton wrote:<blockquote class="Even QEven rt" prefix=">> ">Please find attached two log files of failures on my Windows 11 ARM64 tablet</blockquote></blockquote><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> ">The first one failed with a checksum error:</blockquote><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> ">INFO: Read: size=33, data=93001E1D807D050001FD0000000100FF00FF00FF00FFFE00FF0001FE0000FF01B9<br/>
ERROR: Unexpected answer checksum. [in suunto_vyper.c:370 (suunto_vyper_read_dive)]<br/>
ERROR: DC_STATUS_PROTOCOL</blockquote><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> "> From your first successful log, we have the expected packet:</blockquote><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> ">INFO: Read: size=33, data=93001E1D807D010001FD0000000100FF00FF00FF00FFFE00FF0001FE0000FF01B9</blockquote><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> ">There is indeed a byte that has changed from 0x01 to 0x05. That's one bit that flipped during the transmission.</blockquote><p class="norm"><br/></p><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> ">In the second log, you get a packet that is too small, and contains complete garbage:</blockquote><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> ">INFO: Read: size=14, data=F4FEFF80C0C1CD3FFA7FFDA88DFF<br/>
ERROR: Failed to receive the answer. [in suunto_vyper.c:212 (suunto_vyper_transfer)]<br/>
ERROR: DC_STATUS_TIMEOUT</blockquote><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> ">The expected packet here was:</blockquote><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> ">INFO: Read: size=25, data=050016140001A21C0000000034DB569A0135160A35251344F4</blockquote><p class="norm"><br/></p><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> ">Looks like a bad connection somewhere. Or maybe as Giorgio suggested your ARM tablet does not supply enough power for the PC interface? In that case using an intermediate powered USB hub might indeed help.</blockquote><p class="norm"><br/></p><blockquote class="Odd QOdd rt" prefix="> ">Jef</blockquote></body></xhtml><br/><span style=" font-family:'calibri'; font-size: 12pt;">
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