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fix(ulp): fixed lp-core not booting during sleep

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LP core was unable to boot when system was in deepsleep.
This was due to lp uart init in LP rom using XTAL as clk source,
which is normally powered down during sleep.

This would cause lp uart to get stuck while printing ROM output,
and the app would never boot.

Also fixed wrong wakeup cause used by HP core for ULP wake up
This commit is contained in:
Marius Vikhammer
2024-04-17 13:44:46 +08:00
parent eded4eabf6
commit 1fa59c442b
11 changed files with 36 additions and 23 deletions
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docs/en/api-reference/system/ulp-lp-core.rst
+2 -2
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@@ -165,9 +165,9 @@ To enhance the capabilities of the ULP LP-Core coprocessor, it has access to per
ULP LP-Core ROM
---------------
The ULP LP-Core ROM is a small pre-built piece of code located in LP-ROM, which is not modifiable by users. Similar to the bootloader ROM code ran by the main CPU, this code is executed when the ULP LP-Core coprocessor is started. The ROM code initializes the ULP LP-Core coprocessor and then jumps to the user program. The ROM code is responsible for initializing the LP UART and printing boot messages.
The ULP LP-Core ROM is a small pre-built piece of code located in LP-ROM, which is not modifiable by users. Similar to the bootloader ROM code ran by the main CPU, this code is executed when the ULP LP-Core coprocessor is started. The ROM code initializes the ULP LP-Core coprocessor and then jumps to the user program. The ROM code also prints boot messages if the LP UART has been initialized.
The ROM code is not executed if :cpp:member:`ulp_lp_core_cfg_t::skip_lp_rom_boot` is set to true. This is useful when you need the ULP to wake-up as quickly as possible and the extra overhead of initializing UART and printing is unwanted.
The ROM code is not executed if :cpp:member:`ulp_lp_core_cfg_t::skip_lp_rom_boot` is set to true. This is useful when you need the ULP to wake-up as quickly as possible and the extra overhead of initializing and printing is unwanted.
In addition to the boot-up code mentioned above the ROM code also provides the following functions and interfaces: