ESP32 Forum

Posted: **Tue Dec 08, 2020 11:02 am**

Code: [Select all] [Expand/Collapse]

#define TICK_COUNT_1KHZ  (CPU_FREQ / TICK_FREQ)
void Init_Xthal_Count ( void )
{
    xthal_val_i =  XTHAL_GET_CCOUNT(); 
}
 
void Get_Tick_From_Xthal ( void )
{
    
    if( (XTHAL_GET_CCOUNT() - xthal_val_i) > TICK_COUNT_1KHZ )
    {
        xthal_val_i =  XTHAL_GET_CCOUNT();
        Tick1ms_u8 = 1U;
    }
    else
    {
        Tick1ms_u8 = 0U;
    }
    
}
 
void CORE1_Start ( void *pvParameters )
{
    Init_Xthal_Count();
    while(1)
    {
        Get_Tick_From_Xthal();
        Tick_Check(); 
    }
}

GeSHi © Codebox Plus Extension

I'm trying to use this idea for core usage : viewtopic.php?f=2&t=10006&start=20

I'm creating a Freertos task CORE1_Start() on core1, in this task, i'm trying to generate a 1ms tick from the XTHAL_GET_CCOUNT(), i dont want to use the esp API or freertos inside my CORE1_Start().

The Get_Tick_From_Xthal() is running in a while(1) and going in a function to check flag. Using the code above is working fine until the XTHAL_GET_CCOUNT() value goes negative. The idea to solve the problem was to use XTHAL_SET_COUNT to reset the xthal_ccount value when the tick is reach. It is not working. I assume, the XTHAL_COUNT register in used by the freertos or something else on core0 and we just cant modify this value.

After that i tried to use xthal_set_ccompare() and xthal_get_ccompare() like this :

Code: [Select all] [Expand/Collapse]

void Init_Xthal_Count ( void )
{
    
    xthal_set_ccompare( ID_REGISTER ,  TICK_COUNT_1KHZ );
  
    
}
void Get_Tick_From_Xthal ( void )
{
    
    if( xthal_get_ccompare(ID_REGISTER) )
    {
        Tick1ms_u8 = 1U;
    }
    else
    {
        Tick1ms_u8 = 0U;
    }
    
}

But the value seems to never be reached, Am i using those functions right ? Is there a solution for my first idea ? Thank you for your replies

Tibi

ESP32 Forum

Generate tick from XTHAL_GET_CCOUNT.

Generate tick from XTHAL_GET_CCOUNT.