From 772c469dffac0c89ea27b0df903064c9655432f5 Mon Sep 17 00:00:00 2001 From: Joseph Goydish II Date: Fri, 19 Dec 2025 18:32:23 -0500 Subject: [PATCH] Add technical-details.md: command and protocol analysis details --- report/technical-details.md | 57 +++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 report/technical-details.md diff --git a/report/technical-details.md b/report/technical-details.md new file mode 100644 index 0000000..947289d --- /dev/null +++ b/report/technical-details.md @@ -0,0 +1,57 @@ +# Technical Details + +## Extended Command Activity Breakdown + +**Command 0x81:** +- Total occurrences: 1,432 +- Near I2C address 0x40: High correlation +- Example contexts show byte 0x40 nearby +- Frequency: Very high (possibly every few seconds during use) + +**Command 0xC7:** +- Total occurrences: 968 +- Near I2C address 0x40: High correlation +- Example contexts show byte 0x40 nearby +- Frequency: High (possibly system event triggered) + +**Usage Pattern:** +- Both commands appear throughout traces +- Not concentrated in boot or specific time +- Suggests ongoing use during operation + +--- + +## GPIO Activity Breakdown + +**Bit 0x38 (209 operations):** +- SETB: ~70 times +- CLR: ~139 times +- Pattern: More CLR than SETB (2:1 ratio) +- Interpretation: Possibly "active-low" control signal +- Frequency: Very high + +**Bit 0x34 (35 operations):** +- Mix of SETB/CLR +- Frequency: Moderate +- Could be: Secondary control or status + +**Bit 0x3A (23 operations):** +- Correlates: GPIO2 interrupt (from IODeviceTree) +- Frequency: Lower than others +- Likely: Interrupt signaling (expected) + +--- + +## I2S Pattern Analysis + +**"I2SBHkZStack" String:** +- Appears in audio subsystem traces +- "Stack" suggests software layer +- "BH" meaning unknown +- Could be: "Bidirectional Host" or "Base Host" + +**Value 0x03 Near I2S:** +- 18 occurrences of pattern +- Cannot confirm: If this is mode register write +- Cannot confirm: Timing or context +- Need: Protocol analyzer or kernel trace