ULP Instruction set passing value with global variables

[costa-victor]

Hello there, I'm trying to enable some GPIO's using the ULP while the main processor are in deep sleep mode.

I accomplish this without problems using the ULP examples and enabling the RTC_GPIO_OUT_REG register. Just like the code below:

Code: [Select all] [Expand/Collapse]

1. // Enable RTC GPIO 12, which is equivalent to GPIO2
2. WRITE_RTC_REG(RTC_GPIO_OUT, REG, RTC_GPIO_OUT_DATA_S+12, 1, 1)

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However, I couldn't enable the RTC GPIO 12 using a variable passed by the main processor. The code below shows the instructions that works and what didn't work and I would like to do.

Code: [Select all] [Expand/Collapse]

1. .set gpio_num, 12    // Create a constant with constains the value 12
2.  
3. .bss
4.  
5. // Create a variable gpio_var and add the value 12 from the main code as showed in the ULP Example
6. .global gpio_var
7. gpio_var: .long 0
8.  
9.  
10. // This instruction using a constant works! Because I am passing the value and not the address
11. WRITE_RTC_REG(RTC_GPIO_OUT, REG, RTC_GPIO_OUT_DATA_S+gpio_num, 1, 1)
12.  
13. // This instruction cause an compilation error, probably because I a, passing the address instead the value
14. WRITE_RTC_REG(RTC_GPIO_OUT, REG, RTC_GPIO_OUT_DATA_S+gpio_var, 1, 1)

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So, how could I use here a global variable with the GPIO value I want to activate?

Thanks,
Victor