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Adafruit_Si4713.py
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Adafruit_Si4713.py
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#!/usr/bin/python2
# this code from https://forums.adafruit.com/viewtopic.php?f=50&t=58453 and https://github.com/daniel-j/Adafruit-Si4713-RPi/blob/master/Adafruit_Si4713.py
from time import sleep
import RPi.GPIO as GPIO
from Adafruit_I2C import Adafruit_I2C
class Adafruit_Si4713(Adafruit_I2C):
SI4710_ADDR0 = 0x11 # if SEN is low
SI4710_ADDR1 = 0x63 # if SEN is high, default!
SI4710_STATUS_CTS = 0x80
## Commands ##
SI4710_CMD_POWER_UP = 0x01
SI4710_CMD_GET_REV = 0x10
SI4710_CMD_POWER_DOWN = 0x11
SI4710_CMD_SET_PROPERTY = 0x12
SI4710_CMD_GET_PROPERTY = 0x13
SI4710_CMD_GET_INT_STATUS = 0x14
SI4710_CMD_PATCH_ARGS = 0x15
SI4710_CMD_PATCH_DATA = 0x16
SI4710_CMD_TX_TUNE_FREQ = 0x30
SI4710_CMD_TX_TUNE_POWER = 0x31
SI4710_CMD_TX_TUNE_MEASURE = 0x32
SI4710_CMD_TX_TUNE_STATUS = 0x33
SI4710_CMD_TX_ASQ_STATUS = 0x34
SI4710_CMD_TX_RDS_BUFF = 0x35
SI4710_CMD_TX_RDS_PS = 0x36
SI4710_CMD_TX_AGC_OVERRIDE = 0x48
SI4710_CMD_GPO_CTL = 0x80
SI4710_CMD_GPO_SET = 0x81
## Parameters ##
SI4713_PROP_GPO_IEN = 0x0001
SI4713_PROP_DIGITAL_INPUT_FORMAT = 0x0101
SI4713_PROP_DIGITAL_INPUT_SAMPLE_RATE = 0x0103
SI4713_PROP_REFCLK_FREQ = 0x0201
SI4713_PROP_REFCLK_PRESCALE = 0x0202
SI4713_PROP_TX_COMPONENT_ENABLE = 0x2100
SI4713_PROP_TX_AUDIO_DEVIATION = 0x2101
SI4713_PROP_TX_PILOT_DEVIATION = 0x2102
SI4713_PROP_TX_RDS_DEVIATION = 0x2103
SI4713_PROP_TX_LINE_LEVEL_INPUT_LEVEL = 0x2104
SI4713_PROP_TX_LINE_INPUT_MUTE = 0x2105
SI4713_PROP_TX_PREEMPHASIS = 0x2106
SI4713_PROP_TX_PILOT_FREQUENCY = 0x2107
SI4713_PROP_TX_ACOMP_ENABLE = 0x2200
SI4713_PROP_TX_ACOMP_THRESHOLD = 0x2201
SI4713_PROP_TX_ATTACK_TIME = 0x2202
SI4713_PROP_TX_RELEASE_TIME = 0x2203
SI4713_PROP_TX_ACOMP_GAIN = 0x2204
SI4713_PROP_TX_LIMITER_RELEASE_TIME = 0x2205
SI4713_PROP_TX_ASQ_INTERRUPT_SOURCE = 0x2300
SI4713_PROP_TX_ASQ_LEVEL_LOW = 0x2301
SI4713_PROP_TX_ASQ_DURATION_LOW = 0x2302
SI4713_PROP_TX_ASQ_LEVEL_HIGH = 0x2303
SI4713_PROP_TX_ASQ_DURATION_HIGH = 0x2304
SI4713_PROP_TX_RDS_INTERRUPT_SOURCE = 0x2C00
SI4713_PROP_TX_RDS_PI = 0x2C01
SI4713_PROP_TX_RDS_PS_MIX = 0x2C02
SI4713_PROP_TX_RDS_PS_MISC = 0x2C03
SI4713_PROP_TX_RDS_PS_REPEAT_COUNT = 0x2C04
SI4713_PROP_TX_RDS_MESSAGE_COUNT = 0x2C05
SI4713_PROP_TX_RDS_PS_AF = 0x2C06
SI4713_PROP_TX_RDS_FIFO_SIZE = 0x2C07
def __init__(self, resetpin = 4, addr = None, busnum = -1, debug = False):
self._rst = resetpin
if addr is None:
addr = self.SI4710_ADDR1
self._addr = addr
self._busnum = busnum
self._debug = debug
self.currFreq = 0
self.currdBuV = 0
self.currAntCap = 0
self.currNoiseLevel = 0
self.currASQ = 0
self.currInLevel = 0
# for restoring state
self._freq = None
self._power = None
self._rdsStation = None
self._rdsBuffer = None
def begin(self):
self.reset()
self.bus = Adafruit_I2C(self._addr, self._busnum, self._debug)
self.powerUp()
if self.getRev() is not 13:
return False
return True
def restart(self):
sleep(5)
if self.begin():
# restore values
if self._power:
self.setTXpower(self._power)
if self._freq:
self.tuneFM(self._freq)
if self._rdsStation or self._rdsBuffer:
self.beginRDS()
if self._rdsStation:
self.setRDSstation(self._rdsStation)
if self._rdsBuffer:
self.setRDSbuffer(self._rdsBuffer)
self.readASQ()
self.readTuneStatus()
else:
sleep(5)
self.restart()
def setProperty(self, prop, val):
args = [0, prop >> 8, prop & 0xFF, val >> 8, val & 0xFF]
res = self.bus.writeList(self.SI4710_CMD_SET_PROPERTY, args)
sleep(0.05)
return res
def sendCommand(self, cmd, args):
res = self.bus.writeList(cmd, args)
sleep(0.05)
#self.waitStatus()
return res
def getStatus(self):
return self.bus.readU8(self.SI4710_CMD_GET_INT_STATUS)
def waitStatus(self, waitForByte=0):
timeout = 50 # about 2.5 seconds
response = 0
while True:
response = self.getStatus()
if response is -1:
self.restart()
return
if waitForByte == 0 and response != 0:
break
elif response == waitForByte:
break
sleep(0.05)
timeout -= 1
if timeout == 0:
break
if timeout > 0:
return True
else:
return False
def reset(self):
if self._rst > 0:
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(self._rst, GPIO.OUT)
# toggle pin
GPIO.output(self._rst, GPIO.HIGH)
sleep(0.1)
GPIO.output(self._rst, GPIO.LOW)
sleep(0.1)
GPIO.output(self._rst, GPIO.HIGH)
sleep(0.2) # give it some time to come back
GPIO.cleanup(self._rst)
def powerUp(self):
self.sendCommand(self.SI4710_CMD_POWER_UP, [0x12, 0x50])
self.setProperty(self.SI4713_PROP_REFCLK_FREQ, 32768) # crystal is 32.768
self.setProperty(self.SI4713_PROP_TX_PREEMPHASIS, 1) # 50uS pre-emph (europe std)
self.setProperty(self.SI4713_PROP_TX_ACOMP_ENABLE, 0x03) # turn on limiter and AGC
#self.setProperty(self.SI4713_PROP_TX_ACOMP_GAIN, 10) # max gain?
# aggressive compression
self.setProperty(self.SI4713_PROP_TX_ACOMP_THRESHOLD, 0x10000-15) # -15 dBFS
self.setProperty(self.SI4713_PROP_TX_ATTACK_TIME, 0) # 0.5 ms
self.setProperty(self.SI4713_PROP_TX_RELEASE_TIME, 4) # 1000 ms
self.setProperty(self.SI4713_PROP_TX_ACOMP_GAIN, 5) # dB
def getRev(self):
if self.sendCommand(self.SI4710_CMD_GET_REV, [0x00]) is -1:
self.restart()
return
response = self.bus.readList(0x00, 9)
if response is -1:
self.restart()
return
pn = response[1]
fw = response[2] << 8 | response[3]
patch = response[4] << 8 | response[5]
cmp = response[6] << 8 | response[7]
chiprev = response[8]
return pn
def tuneFM(self, freq):
self._freq = freq
res = self.sendCommand(self.SI4710_CMD_TX_TUNE_FREQ, [0, freq >> 8, freq & 0xff])
if res is -1:
self.restart()
else:
self.waitStatus(0x81)
def setTXpower(self, power, antcap = 0):
self._power = power
res = self.sendCommand(self.SI4710_CMD_TX_TUNE_POWER, [0, 0, power, antcap])
if res is -1:
self.restart()
def readASQ(self):
res = self.sendCommand(self.SI4710_CMD_TX_ASQ_STATUS, [0x1])
if res is -1:
self.restart()
return
response = self.bus.readList(0x00, 5)
if response is -1:
self.restart()
return
self.currASQ = response[1]
self.currInLevel = response[4]
if self.currInLevel > 127:
self.currInLevel -= 256
#print "ASQ:", hex(self.currASQ), "- InLevel:", self.currInLevel, "dBfs"
def readTuneStatus(self):
res = self.sendCommand(self.SI4710_CMD_TX_TUNE_STATUS, [0x1])
if res == -1:
self.restart()
return
response = self.bus.readList(0x00, 8)
if response == -1:
self.restart()
return
self.currFreq = response[2] << 8 | response[3]
self.currdBuV = response[5]
self.currAntCap = response[6] # antenna capacitance (0-191)
self.currNoiseLevel = response[7]
#print "Power:", self.currdBuV, "dBuV - ANTcap:", self.currAntCap, "- Noise level:", self.currNoiseLevel
def readTuneMeasure(self, freq):
# check freq is multiple of 50khz
if freq % 5 != 0:
freq -= (freq % 5)
res = self.sendCommand(self.SI4710_CMD_TX_TUNE_MEASURE, [0, freq >> 8, freq & 0xff, 0])
if res == -1:
self.restart()
else:
self.waitStatus(0x81)
def beginRDS(self):
# 66.25KHz (default is 68.25)
self.setProperty(self.SI4713_PROP_TX_AUDIO_DEVIATION, 6625)
# 2KHz (default)
self.setProperty(self.SI4713_PROP_TX_RDS_DEVIATION, 200)
# RDS IRQ
self.setProperty(self.SI4713_PROP_TX_RDS_INTERRUPT_SOURCE, 0x0001)
# program identifier
self.setProperty(self.SI4713_PROP_TX_RDS_PI, 0x40A7)
# 50% mix (default)
self.setProperty(self.SI4713_PROP_TX_RDS_PS_MIX, 0x03)
# RDSD0 & RDSMS (default)
self.setProperty(self.SI4713_PROP_TX_RDS_PS_MISC, 0x1808)
# 3 repeats (default)
self.setProperty(self.SI4713_PROP_TX_RDS_PS_REPEAT_COUNT, 3)
self.setProperty(self.SI4713_PROP_TX_RDS_MESSAGE_COUNT, 1)
self.setProperty(self.SI4713_PROP_TX_RDS_PS_AF, 0xE0E0) # no AF
self.setProperty(self.SI4713_PROP_TX_RDS_FIFO_SIZE, 0)
self.setProperty(self.SI4713_PROP_TX_COMPONENT_ENABLE, 0x0007)
def setRDSstation(self, s):
self._rdsStation = s
# empty station name to start from
stationName = [' ',' ',' ',' ', ' ',' ',' ',' ', ' ',' ',' ',' ', ' ',' ',' ',' ']
# calc number of slots needed
slots = (len(s)+3) / 4
i = 0
for char in s:
stationName[i] = char
i += 1
# cycle through slots
for i in range(4):
res = self.sendCommand(self.SI4710_CMD_TX_RDS_PS, [i, ord(stationName[i*4]), ord(stationName[(i*4)+1]), ord(stationName[(i*4)+2]), ord(stationName[(i*4)+3]), 0])
if res == -1:
self.restart()
return
def setRDSbuffer(self, s):
self._rdsBuffer = s
bufferArray = [' ',' ',' ',' ', ' ',' ',' ',' ', ' ',' ',' ',' ', ' ',' ',' ',' ', ' ',' ',' ',' ', ' ',' ',' ',' ', ' ',' ',' ',' ', ' ',' ',' ',' ']
# calc number of slots needed
slots = (len(s)+3) / 4
i = 0
for char in s:
bufferArray[i] = char
i += 1
# cycle through slots
for i in range(5):
if i == 0:
secondByte = 0x06
else:
secondByte = 0x04
res = self.sendCommand(self.SI4710_CMD_TX_RDS_BUFF, [secondByte, 0x20, i, ord(bufferArray[i*4]), ord(bufferArray[(i*4)+1]), ord(bufferArray[(i*4)+2]), ord(bufferArray[(i*4)+3]), 0])
if res == -1:
self.restart()
return
def setGPIOctrl(self, x):
self.sendCommand(self.SI4710_CMD_GPO_CTL, [x])
def setGPIO(self, x):
self.sendCommand(self.SI4710_CMD_GPO_SET, [x])