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gamma_pwm_correction.py
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gamma_pwm_correction.py
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from sys import stdout,exit
def disp_val(val):
if (w >= 10000) and (val < 10000): stdout.write(" ")
if (w >= 1000) and (val < 1000): stdout.write(" ")
if (w >= 100) and (val < 100): stdout.write(" ")
if val < 10: stdout.write(" ")
stdout.write(str(val))
def clean_exit():
print("\nPress enter to exit.")
raw_input()
def error_page():
print("\nEntered value is invalid!")
exit(Wrong_Input)
print("Gamma correction value calculater for LED PWM\n")
s = int(raw_input("Array size:\t\t\t\t"))
if s < 1: error_page()
w = int(raw_input("Total PWM steps:\t\t\t"))
if w < 1: error_page()
g = raw_input("Gamma correction (default: 2.5):\t")
if g == "": g = 2.5
try: g = float(g)
except: error_page()
l = str(raw_input("Language (a=Asm, c=C/C++):\t\t"))
if (len(l) > 1) or not l.isalpha(): error_page()
c = int(raw_input("Columns:\t\t\t\t"))
if c < 1: error_page()
##g = 4
##w = 256
##s = 64
##c = 8
##l = 'c'
g = float(g)
l = l.lower()
w -= 1
if l == "a":
print("")
if w > 255:
print(";-----------------------------------------------")
print("; pwm gamma correction")
print("; %d words flash used" %s )
print("; (= %d bytes)" %(2*s) )
print(";-----------------------------------------------")
print("pwm_gamma:")
for i in range(1, s):
val = int(w*((float(i)/s)**g)+0.5)
if i%c == 0:
disp_val(val)
stdout.write("\n")
elif (i-1)%c == 0:
stdout.write(" .dw ")
disp_val(val)
stdout.write(", ")
else:
disp_val(val)
stdout.write(", ")
disp_val(w)
## print(";-----------------------------------------------")
## print("; pwm gamma correction")
## print("; %d words flash used" %(2*s) )
## print("; (= %d bytes)" %(4*s) )
## print(";-----------------------------------------------")
## print("pwm_gamma:")
##
## c >>= 1 ## c /= 2
##
## for i in range(1, s):
## val = (int)(w * pow( float(i)/s, g ) + 0.5)
## val_hnib = val >> 8
## val_lnib = val & 0xFF
## if i%c == 0:
## disp_val(val_hnib)
## stdout.write(", ")
## disp_val(val_lnib)
## stdout.write("\n")
## elif (i-1)%c == 0:
## stdout.write(" .db ")
## disp_val(val_hnib)
## stdout.write(", ")
## disp_val(val_lnib)
## stdout.write(", ")
## else:
## disp_val(val_hnib)
## stdout.write(", ")
## disp_val(val_lnib)
## stdout.write(", ")
##
## val_hnib = w >> 8
## val_lnib = w & 0xFF
##
## disp_val(val_hnib)
## stdout.write(", ")
## disp_val(val_lnib)
else:
num_words = s/2 + s%2
num_bytes = 2*num_words
print(";-----------------------------------------------")
print("; pwm gamma correction")
print("; %d words flash used" %num_words)
print("; (= %d bytes)" %num_bytes)
print(";-----------------------------------------------")
print("pwm_gamma:")
for i in range(1, s):
val = (int)(w*(float(i)/s)**g + 0.5)
if i%c == 0:
disp_val(val)
stdout.write("\n")
elif (i-1)%c == 0:
stdout.write(" .db ")
disp_val(val)
stdout.write(", ")
else:
disp_val(val)
stdout.write(", ")
if s%c == 1: stdout.write(" .db ")
disp_val(w)
clean_exit()
elif l == "c":
if w > 255:
print("\nconst uint16_t pwm_gamma[%d] = {\n\t" %s),
else:
print("\nconst uint8_t pwm_gamma[%d] = {\n\t" %s),
for i in range(1, s):
##val = int(w*(2**(float(i)/s)-1)+0.5)
val = int(w*((float(i)/s)**g)+0.5)
if i%c == 0:
disp_val(val)
stdout.write(",\n\t"),
else:
disp_val(val)
stdout.write(",")
disp_val(w)
stdout.write("};\n")
clean_exit()
else:
error_page()