HTIT-WB32 gpio indexing

Hi all.
I have an HTIT-WB32 board with oled 0.96’’.
I’m trying some sample using Arduinno Ide 2.

I’d like to flicker 1 gpio output. But wichi values I have to use for pinMode and digitalWrite function, regarding the picture of pinout?

That is: I’d like to drive per pin 5 - GPIO5 - V_SPI_CSO as output gpio, which

I try

void setup() {
    pinMode(5, OUTPUT);

void loop() {
    digitalWrite(5, HIGH);
    digitalWrite(5, LOW);

I look the output with an AZDelivery Logic Analyzer (my oscillospe is broken), but nothing flicker.

There a special mode to address gpio in HTIT-WB32?

Best regards,

Add some serial ports for printing, and check whether the program executes normally.