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ulp: Updated ULP docs and ulp_fsm example for wakeup when SoC is not in sleep mode.

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This commit updates the ULP documentation and the ulp_fsm example with
the scenario when a wakeup is triggered from the ULP coproc when the
main CPU is not in sleep mode.

Closes https://github.com/espressif/esp-idf/issues/8341
Closes https://github.com/espressif/esp-idf/issues/5254
This commit is contained in:
Sudeep Mohanty
2022-09-05 16:29:32 +02:00
parent 572e79530c
commit afbea0a04c
2 changed files with 26 additions and 2 deletions
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16
examples/system/ulp_fsm/ulp/main/ulp/wake_up.S
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@@ -1,14 +1,28 @@
/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
/* ULP assembly files are passed through C preprocessor first, so include directives
and C macros may be used in these files
*/
#include "soc/rtc_cntl_reg.h"
#include "soc/soc_ulp.h"
#include "sdkconfig.h"
.global wake_up
wake_up:
/* Check if the system is in sleep mode */
#if CONFIG_IDF_TARGET_ESP32
READ_RTC_REG(RTC_CNTL_LOW_POWER_ST_REG, 27, 0)
#else
READ_RTC_FIELD(RTC_CNTL_LOW_POWER_ST_REG, RTC_CNTL_MAIN_STATE_IN_IDLE)
#endif
move r1, r0
/* Check if the system can be woken up */
READ_RTC_FIELD(RTC_CNTL_LOW_POWER_ST_REG, RTC_CNTL_RDY_FOR_WAKEUP)
and r0, r0, 1
/* If the system is in normal mode or if the system is in sleep mode with ready for wakeup set, we can signal the main CPU to wakeup */
or r0, r0, r1
jump wake_up, eq
/* Wake up the SoC, end program */