CC2541 adc gives false readings with POWER_SAVING

Other Parts Discussed in Thread: CC2541, CC2538

Hello

I am currently trying to get the battery monitor working with CC2541 (sensor tag). The problem is that when POWER_SAVING is defined, the adc returns usually a static reading regardless of the VDD. However when the define is removed it works just fine. I pasted the code i used to read the values from adc below.

I have not found anything in the manuals or guides that says the ad converter cannot work if the power savings macro is used. However i presume that the problem lies with the clock management during the conversion. Any help is appreciated.

void HalMyAdcRead(void)
{  
    uint32 calib = *(uint8 *)0x7826<<7; // value from info page
    calib <<= 1;
    calib |= *(uint8 *)0x7827;
    calib *= 100;  //for accuracy, to be divided out later
    
    //read adc value
    ADCCON2 = 0x3F;   //12 bits resolution, internal ref, channel = vdd/3                
    ADCCON1 = 0x73;   //start conversion
    while(!(ADCCON1 & 0x80));  //wait for conversion
    v = ADCL;  //read adc value                       
    v |= (((uint16) ADCH) << 8); 
    

    v = 30000* v / calib;  // 3 (ideal voltage) * 1000 (for accuracy) * v (adc reading) / calib
    battery = (uint16) v;  

}