python.L1.Base.PrescaleHelper Namespace Reference

Functions
	getCutFromPrescale (prescale)
	getPrescaleFromCut (cut)

Variables
	log = logging.getLogger(__name__)
int	maxPrescaleCut = 0xFFFFFF

Function Documentation

getCutFromPrescale()

python.L1.Base.PrescaleHelper.getCutFromPrescale

(

prescale

)

C = 2**24-(2**24-1)/PS

PS =       1 --> C = 1
PS =       2 --> C = 8388609
PS =      10 --> C = 15099495
PS =    1000 --> C = 16760439
PS =   10000 --> C = 16775539
PS = 2**24-1 --> C = 2**24-1

Definition at line 24 of file PrescaleHelper.py.

def getCutFromPrescale(prescale):
    """
    C = 2**24-(2**24-1)/PS
    
    PS =       1 --> C = 1
    PS =       2 --> C = 8388609
    PS =      10 --> C = 15099495
    PS =    1000 --> C = 16760439
    PS =   10000 --> C = 16775539
    PS = 2**24-1 --> C = 2**24-1
    """
 
    if prescale==0:
        raise RuntimeError("L1 Prescale value of 0 is not allowed")
    
    sign = -1 if prescale<0 else 1
    prescale = abs(prescale)
    cut=sign * ( 0x1000000 - (0xFFFFFF/prescale) )
    cut = round( cut )
    if  prescale > 0xFFFFFF:
        cut=sign * (0x1000000-1)
 
    return int(cut)
 

getPrescaleFromCut()

python.L1.Base.PrescaleHelper.getPrescaleFromCut

(

cut

)

PS = (2**24-1)/(2**24-C)

C =       1 --> PS =     1
C = 2**24-1 --> PS = 2**24-1

Definition at line 48 of file PrescaleHelper.py.

def getPrescaleFromCut(cut):
    """
    PS = (2**24-1)/(2**24-C)
 
    C =       1 --> PS =     1
    C = 2**24-1 --> PS = 2**24-1
    """
    
    if cut==0:
        raise RuntimeError("L1 Prescale cut of 0 is not allowed, use cut=1 for a prescale value of 1")
 
    sign = -1 if cut<0 else 1
    cut = abs(cut)
    return (sign * 0xFFFFFF) / ( 0x1000000 - cut )

Variable Documentation

log

python.L1.Base.PrescaleHelper.log = logging.getLogger(__name__)

Definition at line 4 of file PrescaleHelper.py.

maxPrescaleCut

int python.L1.Base.PrescaleHelper.maxPrescaleCut = 0xFFFFFF

Definition at line 22 of file PrescaleHelper.py.