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Merge branch 'bugfix/deep_sleep_example_stub_delay' into 'master'

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sdkconfig: set CONFIG_ESP32_DEEP_SLEEP_WAKEUP_DELAY=2000 by default

See merge request !758
This commit is contained in:
Angus Gratton
2017-05-29 12:11:56 +08:00
parent 034d37b9cb 3c583a7655
commit d718cbd873
4 changed files with 6 additions and 13 deletions
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12
components/esp32/Kconfig
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@@ -548,18 +548,18 @@ config ESP32_RTC_CLK_CAL_CYCLES
config ESP32_DEEP_SLEEP_WAKEUP_DELAY
int "Extra delay in deep sleep wake stub (in us)"
default 0
default 2000
range 0 5000
help
When ESP32 exits deep sleep, the CPU and the flash chip are powered on
at the same time. CPU will run deep sleep stub first, and then
proceed to load code from flash. Some flash chips need sufficient
time to pass between power on and first read operation. By default,
without any extra delay, this time is approximately 900us.
If you are using a flash chip which needs more than 900us to become
ready after power on, set this parameter to add extra delay
to the default deep sleep stub.
without any extra delay, this time is approximately 900us, although
some flash chip types need more than that.
By default extra delay is set to 2000us. When optimizing startup time
for applications which require it, this value may be reduced.
If you are seeing "flash read err, 1000" message printed to the
console after deep sleep reset, try increasing this value.