ESP32 Forum

urbanze wrote:I tried to change any global variable with ULP, but doesnt work. What I do wrong?

krzychb wrote:Hi urbanze,

urbanze wrote:I tried to change any global variable with ULP, but doesnt work. What I do wrong?

I can't read anything on these screen shoots I will be guessing then

Maybe you are missing the "ulp_" prefix?
Ref. https://esp-idf.readthedocs.io/en/lates ... -variables

EDIT: If this is not the case, then try a classic example https://github.com/espressif/esp-idf/tr ... system/ulp.
This example is using global variables and it works for me.

krzychb wrote:Why you cant view screen shots?

ESP_igrr wrote:ULP code seems to be missing a store after the increment.

krzychb wrote:

krzychb wrote:Why you cant view screen shots?

I can view the screen shots but not the tiny font
Copy and paste of code would work better for me in this case.
Also a plan text is easier for anybody to copy back for testing instead of retyping.

@ESP_igrr, thank you for help with this one!

urbanze wrote:Code in C have:

variable: extern uint32_t ulp_x = 1;

and load/run to ulp.

urbanze wrote:
Code in ulp

.global x
x: .long 0

.global entry
entry:

move r0, x
ld r0, r0, x
add r0, r0, 1
halt


I comment before with another two tests, and anyone doenst worked

krzychb wrote:

urbanze wrote:Code in C have:

variable: extern uint32_t ulp_x = 1;

and load/run to ulp.

How do verify whether "ulp_x" is changing its value or not?

void ulp()
{
	Serial.printf("\nULP_X: %d", ulp_x & UINT16_MAX);
	delay(100);
	ulp_load_binary(0, ulp_main_bin_start, (ulp_main_bin_end - ulp_main_bin_start) / sizeof(uint32_t));
	ulp_run((&ulp_entry - RTC_SLOW_MEM) / sizeof(uint32_t));
	delay(100);
	Serial.printf("\nULP_X: %d", ulp_x & UINT16_MAX);
}