import os , time
import sys
import greatfet
import codext



TXFREQUENCY=7028000
DELTAFREQ=170 
 
 
gf = greatfet.GreatFET()

"""
  RTTY via GREATFET via AD9820
"""
W_CLK = "J1_P4"
FQ_UD =  "J1_P6"
DATA = "J1_P28"
RESET = "J1_P30"
CLKIN = 125000000

pW_CLK = gf.gpio.get_pin(W_CLK)
pW_CLK.set_direction(gf.gpio.DIRECTION_OUT)
pFQ_UD = gf.gpio.get_pin(FQ_UD)
pFQ_UD.set_direction(gf.gpio.DIRECTION_OUT)
pDATA = gf.gpio.get_pin(DATA)
pDATA.set_direction(gf.gpio.DIRECTION_OUT)
pRESET = gf.gpio.get_pin(RESET)
pRESET.set_direction(gf.gpio.DIRECTION_OUT)

pW_CLK.write(False)
pFQ_UD.write(False)
pDATA.write(False)
pRESET.write(False)

def pulsePin(pin):
	pin.write(True)
	pin.write(True)
	pin.write(True)
	pin.write(False)
	return



def setFreq( f):


 pulsePin(pFQ_UD)
 freq = int((f*(2**32))/CLKIN)

 phase = 0   
 phas = int ((phase*(2**5))/360)

 for i in range (0,34):
  pDATA.write( freq & 0x01)
  pulsePin(pW_CLK)
  freq = freq >> 1
	
 pDATA.write( 0x00 & 0x01)
 pulsePin(pW_CLK)

 for j in range (0,4):
  pDATA.write( phas & 0x01)
  pulsePin(pW_CLK)
  phas = phas >> 1

 pDATA.write( 0x00 & 0x01)
 pulsePin(pW_CLK)
 pulsePin(pFQ_UD)

def setBit( bit):
 # The recommended audio frequencies are 2125 Hz for the MARK audio frequency and 2295(+170) Hz for the SPACE audio frequency. 
 #print("**", bit)
 time.sleep(0.01)
 if bit==0:
  setFreq( TXFREQUENCY + DELTAFREQ)  # SPACE
 else:
  setFreq( TXFREQUENCY )  # MARK
 
# -----------------------------------------------------------

pulsePin(pRESET)

pulsePin(pW_CLK)
pulsePin(pW_CLK)
pulsePin(pW_CLK)

setBit(1)  #   IDLE is MARK
s= "ON4CKO ON4CKO CQ CQ PSE K"
bitstring  = codext.encode( s, 'baudot-ccitt2')
print("TO DO:", s)
i=0
for c in [(bitstring[i:i+5][::-1]) for i in range(0, len(bitstring), 5)]:
 try:
  print( "%s(%c)"%(c, s[i]) ,end=" ")
  sys.stdout.flush()
 except:
  pass
 setBit( 0)  # 1 (start)
 for b in c: # 2,3,4,5,6
  
  if b=='0':
    setBit( 0) # 7
  else:
    setBit( 1)
    
 setBit(1) # 7 (2 x stop bit is MARk for amateur RTTY) 
 setBit(1) # 8 MARK
 i = i + 1   

print("\nDONE")