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docs, examples: use rtc_gpio_isolate to disconnect GPIO12

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This is needed to reduce deep sleep current on ESP32-WROVER modules.

Ref TW18165.
This commit is contained in:
Ivan Grokhotkov
2018-02-10 00:34:38 +08:00
parent f45622ff17
commit af6cfc5552
5 changed files with 32 additions and 8 deletions
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10
examples/system/ulp/main/ulp_example_main.c
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@@ -68,11 +68,13 @@ static void init_ulp_program()
rtc_gpio_pullup_dis(gpio_num);
rtc_gpio_hold_en(gpio_num);
/* Disable pullup on GPIO15, in case it is connected to ground to suppress
* boot messages.
/* Disconnect GPIO12 and GPIO15 to remove current drain through
* pullup/pulldown resistors.
* GPIO15 may be connected to ground to suppress boot messages.
* GPIO12 may be pulled high to select flash voltage.
*/
rtc_gpio_pullup_dis(GPIO_NUM_15);
rtc_gpio_hold_en(GPIO_NUM_15);
rtc_gpio_isolate(GPIO_NUM_12);
rtc_gpio_isolate(GPIO_NUM_15);
/* Set ULP wake up period to T = 20ms (3095 cycles of RTC_SLOW_CLK clock).
* Minimum pulse width has to be T * (ulp_debounce_counter + 1) = 80ms.