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content:meshextender:me2.0_eeprom_plan
Mesh Extender 2.0 I2C EEPROM Memory Layout
We are using 2KB I2C EEPROMs. These EEPROMS provide a write-protect function for the upper-half of the EEPROM. The lower-half can always be written.
Memory Layout
Note that memory from 0x400 - 0x7FF is write-protected via the Write Protect Pin (WPP) of the 2KB I2C EEPROM. Therefore all regulatory information is stored in that region.
The non-protected region from 0x000 - 0x03FF is used to contain information of relevance to Mesh Extender deployments, such as network identification and permission features, e.g., controlling the over-the-air update bundle ID, and specifying the password for ssh login (if enabled). These will be implemented as key value pairs, e.g., OTABID=….
| Start Address | End Address | Size | Description |
|---|---|---|---|
| 0x000 | 0x3EE | 1001 | Mesh-Extender configuration directives. Compressed using libz. |
| 0x3EF | 0x3EF | 1 | Mesh-Extender configuration directive format version. Must be 0x01. |
| 0x3F0 | 0x3FF | 16 | SHA-3 128 bit hash of 0x000 - 0x3EF. |
| 0x400 | 0x7AF | 944 | Regulatory domain explanantory notes. |
| 0x7B0 | 0x7BF | 16 | SHA-3 128 bit hash of 0x400 - 0x7AF. |
| 0x7C0 | 0x7DF | 32 | Reserved write-protected data. |
| 0x7E0 | 0x7EF | 16 | Radio Parameters |
| 0x7E0 | 0x7E0 | 1 | Maximum allowed radio duty-cycle |
| 0x7E1 | 0x7E1 | 1 | Maximum allowed radio transmit power (in dBm) |
| 0x7E2 | 0x7E5 | 4 | Centre frequency for transmission |
| 0x7E6 | 0x7E7 | 2 | Radio data bit-rate (Kbit/second) |
| 0x7E8 | 0x7E8 | 1 | Regulatory firmware lock required |
| 0x7E9 | 0x7EC | 4 | Reserved. Should be zero. |
| 0x7ED | 0x7EE | 2 | Primary 2-letter ISO country code. |
| 0x7EF | 0x7EF | 1 | Version of data format for 0x7C0-0x7FF. Must be 0x01. |
| 0x7F0 | 0x7FF | 16 | SHA-3 128 bit hash of 0x7C0 - 0x7EF. |
content/meshextender/me2.0_eeprom_plan.txt · Last modified: 04/03/2017 20:25 by Paul Gardner-Stephen
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