The code that I have working for the ESP32 does not work for the ESP32-S3. On the ESP32-S3, the next wake just does a reboot to setup() (in arduino framework)
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// THIS CODE WORKS ON ESP32 BUT NOT ON ESP32-S3
// Set the pointer of the wake stub function.
REG_WRITE(RTC_ENTRY_ADDR_REG, (uint32_t)&wake_stub);
// Go to sleep.
CLEAR_PERI_REG_MASK(RTC_CNTL_STATE0_REG, RTC_CNTL_SLEEP_EN);
SET_PERI_REG_MASK(RTC_CNTL_STATE0_REG, RTC_CNTL_SLEEP_EN);
// A few CPU cycles may be necessary for the sleep to start...
while (true) {
;
}
The TRM https://www.espressif.com/sites/default ... ual_en.pdf in section 10.6: RTC Boot, on page 565 provides the following, but I just don't understand how exactly to write the code. (I've only been programming uProcessors since the days of the Intel 8080, but this is stumping me).
Could someone help? Please and Thank You.
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The wakeup time from Deep-sleep mode is much longer, compared to Light-sleep and Modem-sleep modes,
because the ROMs and RAMs are both powered down in this case, and the CPU needs more time for SPI
booting (data-copying from the flash). However, it’s worth noting that both RTC fast memory and RTC slow
memory remain powered up in the Deep-sleep mode. Therefore, users can store codes (so called “deep sleep
wake stub” of up to 8 KB) either in RTC fast memory or RTC slow memory, which doesn’t require the
above-mentioned SPI booting, thus speeding up the wakeup process.
Method one: Boot using RTC slow memory
1. Set RTC_CNTL_PROCPU_STAT_VECTOR_SEL to 0.
2. Send the chip into sleep.
3. After the CPU is powered up, the reset vector starts resetting from 0x50000000 instead of 0x40000400,
which does not involve any SPI booting. The codes stored in RTC slow memory starts running immediately
after the CPU reset. The code stored in the RTC slow memory only needs to be partially initialized in a C
environment.
Method two: Boot using RTC fast memory
1. Set RTC_CNTL_PROCPU_STAT_VECTOR_SEL to 1.
2. Calculate CRC for the RTC fast memory, and save the result in RTC_CNTL_RTC_STORE7_REG[31:0].
3. Set RTC_CNTL_RTC_STORE6_REG[31:0] to the entry address of RTC fast memory.
4. Send the chip into sleep.
5. ROM unpacking and some of the initialization starts after the CPU is powered up. After that, the CRC for
the RTC fast memory will be calculated again. If the result matches with register
RTC_CNTL_RTC_STORE7_REG[31:0], the CPU jumps to the entry address.
The boot flow is shown in Figure 10-11.Code: Select all
static void RTC_IRAM_ATTR wake_stub()
{
}