MCU Services: Difference between revisions
Solved jhl mistery |
m Fixed brace placement |
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=MCU firmware versions= | =MCU firmware versions= | ||
These reside in mcu-module .rodata, are uploaded to MCU register 0x05 and are usually 0x4003 bytes in size (the actual firmware is 0x4000 bytes preceeded by a 3 byte magic header "<code>jhl</code>" | These reside in mcu-module .rodata, are uploaded to MCU register 0x05 and are usually 0x4003 bytes in size (the actual firmware is 0x4000 bytes preceeded by a 3 byte magic header "<code>jhl</code>" which switches the I2C comms into flash write mode). | ||
Switching requires register 0x05 (at address <code>0xFFBA9</code>) to contain 0x6A ('<code>j</code>'), register 0x06 containing 0x68 ('<code>h</code>'), and writing 0x6C ('<code>l</code>') to register 0x07. The actual flashing sequence is only signaled (code at 0x3312-0x331A) when writing register 0x07, it's skipped otherwise. Register 0x07 gets written anyways, just the actual signaling is skipped if the conditions aren't met. | Switching requires register 0x05 (at address <code>0xFFBA9</code>) to contain 0x6A ('<code>j</code>'), register 0x06 containing 0x68 ('<code>h</code>'), and writing 0x6C ('<code>l</code>') to register 0x07. The actual flashing sequence is only signaled (code at 0x3312-0x331A) when writing register 0x07, it's skipped otherwise. Register 0x07 gets written anyways, just the actual signaling is skipped if the conditions aren't met. | ||