diff options
| author | Sean Abraham <seanabraham@chromium.org> | 2021-03-01 15:13:48 -0700 |
|---|---|---|
| committer | Sean Abraham <seanabraham@chromium.org> | 2021-03-01 22:59:54 +0000 |
| commit | 1e800ac838504c0d2950c7aa90cdfe7bde251545 (patch) | |
| tree | 64706ca3d77a1452ac653d40fb71e6ae9d6a34bc /docs/i2c-debugging.md | |
| parent | ef6a915de0a2b65c18c03074b66717d597675162 (diff) | |
| download | chrome-ec-master.tar.gz | |
docs: point md files in master to main/HEADmaster
Master md files are out of date. Point to main branch in case someone
lands in master branch from an old link.
BUG=b:180952272,b:180921286
BRANCH=None
TEST=Preview changes with gerrit
Exempt-From-Owner-Approval: fixing docs
Change-Id: I6583b6c7fc21248eb49a6cd71e077fbdb5de2435
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2727846
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: Rob Barnes <robbarnes@google.com>
Auto-Submit: Sean Abraham <seanabraham@chromium.org>
Tested-by: Sean Abraham <seanabraham@chromium.org>
Diffstat (limited to 'docs/i2c-debugging.md')
| -rw-r--r-- | docs/i2c-debugging.md | 57 |
1 files changed, 4 insertions, 53 deletions
diff --git a/docs/i2c-debugging.md b/docs/i2c-debugging.md index 7ab84f9d8d..304f72aa2c 100644 --- a/docs/i2c-debugging.md +++ b/docs/i2c-debugging.md @@ -1,54 +1,5 @@ -I²C Debugging Tips -================== +*** note +**Warning: This document is old & has moved. Please update any links:**<br> +https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/docs/i2c-debugging.md +*** -The EC codebase has functionality to help you debug I²C errors without -pulling out the scope. Some of the debug functionality is disabled by -default to save space, but can be enabled with the `CONFIG_I2C_DEBUG` -option. - -Tracing -------- - -You can use the `i2ctrace` command to monitor (ranges of) addresses: - -``` -i2ctrace [list - | disable <id> - | enable <port> <address> - | enable <port> <address-low> <address-high>] -``` - -For example: - -``` -> i2ctrace enable 0 0x10 0x30 -> i2ctrace enable 1 0x20 -> i2ctrace list -id port address --- ---- ------- -0 0 0x10 to 0x30 -1 1 0x40 to 0x50 -... debug spam may follow ... -i2c: 1:0x20 wr 0x10 rd 0x01 0x00 -i2c: 1:0x20 wr 0x10 0x01 0x00 -... -> i2ctrace disable 1 -> i2ctrace list -id port address --- ---- ------- -0 0 0x10 to 0x30 -``` - -A maximum of 8 debug entries are supported at a single time. - -Note that `i2ctrace enable` will merge debug entries when possible: - -``` -> i2ctrace enable 0 0x10 0x30 -> i2ctrace enable 0 0x40 0x50 -> i2ctrace enable 0 0x31 0x3f -> i2ctrace list -id port address --- ---- ------- -0 0 0x10 to 0x50 -```
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