activate pullups un rtc gpio during the wake up stub

[eccessivo]

Hi all!
please help me to understand what i am doing wrong.
I can't manipulate the status of the pullups and pull down during the wake up stub on rtc gpio 25,26,27
Here is the code:

Code: [Select all] [Expand/Collapse]

1. //esp32 is in deepsleep with pullups and pull down disabled
2. //wake up is triggered and the wake up sub is executed. here is some code from my wake up stub:
3. //Set the pins as input ,pull ups enabled, to be digital read
4.  
5. PIN_FUNC_SELECT(GPIO_PIN_REG_27, PIN_FUNC_GPIO);
6.   PIN_FUNC_SELECT(GPIO_PIN_REG_26, PIN_FUNC_GPIO);
7.   PIN_FUNC_SELECT(GPIO_PIN_REG_25, PIN_FUNC_GPIO);
8.  
9.   PIN_INPUT_ENABLE(GPIO_PIN_REG_27);
10.   PIN_INPUT_ENABLE(GPIO_PIN_REG_26);
11.   PIN_INPUT_ENABLE(GPIO_PIN_REG_25);
12.  
13.   REG_WRITE(GPIO_ENABLE_W1TC_REG, BIT27);
14.   REG_WRITE(GPIO_ENABLE_W1TC_REG, BIT26);
15.   REG_WRITE(GPIO_ENABLE_W1TC_REG, BIT25);
16.  
17.   REG_CLR_BIT(GPIO_PIN_REG_27, FUN_PD);
18.   REG_SET_BIT(GPIO_PIN_REG_27, FUN_PU);
19.  
20.   REG_CLR_BIT(GPIO_PIN_REG_26, FUN_PD);
21.   REG_SET_BIT(GPIO_PIN_REG_26, FUN_PU);
22.  
23.   REG_CLR_BIT(GPIO_PIN_REG_25, FUN_PD);
24.   REG_SET_BIT(GPIO_PIN_REG_25, FUN_PU);
25.  
26. //read and store the value of each pin (code is omitted)
27. //deacitvate all pullups ad pulldown
28. REG_CLR_BIT(GPIO_PIN_REG_27, FUN_PD);
29.   REG_CLR_BIT(GPIO_PIN_REG_27, FUN_PU);
30.  
31.   REG_CLR_BIT(GPIO_PIN_REG_26, FUN_PD);
32.   REG_CLR_BIT(GPIO_PIN_REG_26, FUN_PU);
33.  
34.   REG_CLR_BIT(GPIO_PIN_REG_25, FUN_PD);
35.   REG_CLR_BIT(GPIO_PIN_REG_25, FUN_PU);
36. // go back to sleep within the wakeup stub

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[/Codebox][/Codebox]

[boarchuz]

According to the note here:
https://github.com/espressif/esp-idf/bl ... #L113-L115

// SOC_GPIO_SUPPORT_RTC_INDEPENDENT not defined. On ESP32 those PADs which have RTC functions must
// set pullup/down/capability via RTC register. On ESP32-S2, Digital IOs have their own registers to
// control pullup/down/capability, independent with RTC registers.

you'll need to use RTC registers as 26-27 are RTC GPIOs.

See how IDF does pullx according to RTC GPIO or not:
https://github.com/espressif/esp-idf/bl ... .c#L80-L97

[eccessivo]

Thank you for your reply. Is very interesting.
Before to write this reply i made a some tries to get it working but i had no luck.
The problem is that i can't call this function rtc_gpio_pullup_en() within the wakeup stub. During the stub i can access only the basic ROM functions to make direct register manipulation (as i do in the posted code) otherwise i get a esp32 reset.
Following your suggestion i am trying to figure out which register are manipulated by the "rtc_gpio_pullup_en()" function to do the same but using the rom functions.
Any one can help?
TNX in advance

[eccessivo]

A further update...
Rtc register involved in setting pullups and pull down seems to be:
IO_MUX_x_REG (x: GPIO0-GPIO39).
but unfortunately by setting the pullups on this register during the wakeup stub doesn't have any effect...... I am getting mad!
Here is the code:

Code: [Select all] [Expand/Collapse]

1. (GPIO_PIN_REG_4, PIN_FUNC_GPIO);
2.   PIN_FUNC_SELECT(GPIO_PIN_REG_27, PIN_FUNC_GPIO);
3.   PIN_FUNC_SELECT(GPIO_PIN_REG_26, PIN_FUNC_GPIO);
4.   PIN_FUNC_SELECT(GPIO_PIN_REG_25, PIN_FUNC_GPIO);
5.  
6.   PIN_INPUT_ENABLE(GPIO_PIN_REG_27);
7.   PIN_INPUT_ENABLE(GPIO_PIN_REG_26);
8.   PIN_INPUT_ENABLE(GPIO_PIN_REG_25);
9.  
10.  
11.   REG_WRITE(GPIO_ENABLE_W1TC_REG, BIT27);
12.   REG_WRITE(GPIO_ENABLE_W1TC_REG, BIT26);
13.   REG_WRITE(GPIO_ENABLE_W1TC_REG, BIT25);
14.  
15.   REG_CLR_BIT(GPIO_PIN_REG_27, FUN_PD);
16.   REG_SET_BIT(GPIO_PIN_REG_27, FUN_PU);
17.  
18.   REG_CLR_BIT(GPIO_PIN_REG_26, FUN_PD);
19.   REG_SET_BIT(GPIO_PIN_REG_26, FUN_PU);
20.  
21.   REG_CLR_BIT(GPIO_PIN_REG_25, FUN_PD);
22.   REG_SET_BIT(GPIO_PIN_REG_25, FUN_PU);
23.  
24. //manipulation of the IO_MUX_x_REG (x: GPIO0-GPIO39). register. bit 3 would connect the pullup
25.    
26. REG_SET_BIT(GPIO_PIN_REG_27, (BIT(3)));
27. REG_SET_BIT(GPIO_PIN_REG_26, (BIT(3)));
28. REG_SET_BIT(GPIO_PIN_REG_25, (BIT(3)));

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[WiFive]

https://github.com/espressif/esp-idf/bl ... .c#L60-L81

[eccessivo]

Hi WiFive, i followed the link but can you better explain ? how can i use it?

[eccessivo]

Hi All,
Thanks to your help i solved:
to eneble to pullup within the wake up stub, i added these lines to set the bit in the proper registers (suggested by WiFive):

Code: [Select all] [Expand/Collapse]

1.  REG_SET_BIT(RTC_IO_TOUCH_PAD7_REG, RTC_IO_TOUCH_PAD7_RUE_M);
2.  REG_SET_BIT(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_RUE_M);
3.  REG_SET_BIT(RTC_IO_PAD_DAC2_REG, RTC_IO_PDAC2_RUE_M);

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