{"id":9083,"date":"2007-11-20T22:28:00","date_gmt":"2007-11-21T03:28:00","guid":{"rendered":"https:\/\/nuxx.net\/blog\/2007\/11\/20\/protocol-disappointment\/"},"modified":"2026-07-01T11:36:16","modified_gmt":"2026-07-01T15:36:16","slug":"protocol-disappointment","status":"publish","type":"post","link":"https:\/\/nuxx.net\/blog\/2007\/11\/20\/protocol-disappointment\/","title":{"rendered":"Protocol Disappointment"},"content":{"rendered":"

<\/a><\/p>\n

I ran into some headaches with electronics tonight. First, I tried to get recognizable data out of the Honda Music Link, using most of the hardware mentioned last night<\/a>. Unfortunately, this didn’t work out as I hoped. While the PIC and NEC-branded IEbus controller communicate via SPI, a Control \/ Data line is also used. This means that the data I sniff in either direction could either be control or data, and without knowing the state of that line it’ll be even harder to figure out the protocol.<\/p>\n

I’m thinking that the best thing to do (if I want to continue the project) is to pick up a PIC with two SPI lines, so I can read both of them into buffers at the same time. Then I can also check the status of C\/D, bundle all this together, and easily output it to the PC, already in a somewhat readable format.<\/p>\n

Or, I can just stop working on the project again.<\/p>\n

After getting frustrated with that, I decided to tear into the Xbox 360 Chatpad (photo gallery retired)<\/em> and see if I could figure out what it is spitting out. Well, the short answer is that I couldn’t. I was able to see something, but I’m not sure what it is. (Screenshot of data being captured.<\/a>)<\/p>\n

The serial data is 0-2V when coming out of the 360, and it appears to do some regular polling, back and forth. I couldn’t figure out the baud rate and whatnot, so I couldn’t really tell if what I was seeing was valid data or not. That said, it’s a start.<\/p>\n

Here’s two more photos:<\/p>\n

· Test leads connected to Chatpad.<\/a>
\n· Detail of leads soldered to internal Xbox 360 Chatpad connector.<\/a><\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

I ran into some headaches with electronics tonight. First, I tried to get recognizable data out of the Honda Music Link, using most of the hardware mentioned last night. Unfortunately, this didn’t work out as I hoped. While the PIC and NEC-branded IEbus controller communicate via SPI, a Control \/ Data line is also used.\u2026<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,6,34],"tags":[],"class_list":["post-9083","post","type-post","status-publish","format-standard","hentry","category-automotive","category-electronics","category-moved-from-livejournal"],"_links":{"self":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/9083","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/comments?post=9083"}],"version-history":[{"count":4,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/9083\/revisions"}],"predecessor-version":[{"id":24661,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/9083\/revisions\/24661"}],"wp:attachment":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/media?parent=9083"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/categories?post=9083"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/tags?post=9083"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}