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| #!/usr/bin/python3
# -*- coding: utf-8 -*-
# import RPi.GPIO as GPIO
from smbus2 import SMBus
from smbus2 import SMBusWrapper
import time
import numpy as np
'''
# SMBbus main functions
from smbus2 import SMBus
# Open i2c bus 1 and read one byte from address 80, offset 0
bus = SMBus(1)
b = bus.read_byte_data(80, 0)
print(b)
bus.close()
# ============= read a byte ====================
from smbus2 import SMBusWrapper
with SMBusWrapper(1) as bus:
b = bus.read_byte_data(80, 0)
print(b)
# ============= write a byte ======================
from smbus2 import SMBusWrapper
with SMBusWrapper(1) as bus:
# Write a byte to address 80, offset 0
data = 45
bus.write_byte_data(80, 0, data)
# ============ bloc of data ==========================
from smbus2 import SMBusWrapper
with SMBusWrapper(1) as bus:
# Read a block of 16 bytes from address 80, offset 0
block = bus.read_i2c_block_data(80, 0, 16)
# Returned value is a list of 16 bytes
print(block)
from smbus2 import SMBusWrapper
with SMBusWrapper(1) as bus:
# Write a block of 8 bytes to address 80 from offset 0
data = [1, 2, 3, 4, 5, 6, 7, 8]
bus.write_i2c_block_data(80, 0, data)
'''
class tea5767 :
def __init__(self):
self.bus = SMBus(1)
self.addr = 0x60
self.Fif = 225000
self.Fref = 32768
# ================== Parameter ==========================================
# while writing bytes
# 1st byte
self.mute = 0 # 1 for mute # 7
self.search_mode = 0 # 1 for search mode # 6
# 1st and 2nd byte
self.PLL = 12234 # 5-0 and 7-0
# 3rd byte
self.search_direction = 0 # 7
self.search_stop_level = np.array([0,1], dtype=np.int8) # 6-5
self.side_injection = 1 # 4
self.mono = 0 # force mono # 3
self.mute_right = 0 # 2
self.mute_left = 0 # 1
self.port1 = 0 # check ready signal # 0
# 4th byte
self.port2 = 0 # 7
self.stanby_mode = 0 # 6
self.band_limit = 0 # 0 for europe # 5
self.clock_freq = 1 # 0 for 13MHz / 1 for 32.768kHz let PLLREF to 0 # 4
self.soft_mute = 0 # 3
self.high_cut_control = 0 # 2
self.stereo_noise_cancelling = 0 # 1
self.search_indicator = 1 # make port1 an output for readyflag # 0
# 5th byte
self.pllref = 0 # 1 to enable external clock reference at 6.5MHz # 7
self.dtc = 0 # change de-emphasis time constant # 6
# while reading bytes
# 1st byte
self.ready_flag = 0 # station have been found # 7
self.band_limit_flag = 0 # band limit reached # 6
# next = pll
# 3rd byte
# stereo => use self.mono # 7
self.IF_counter_result = 0 # pas compris intermediate freq # 6-0
# 4th byte
self.output_level = np.array([0,0,0], dtype=np.int8) # 7-4
self.chip_ID = np.array([0,0,0], dtype=np.int8) # 3-1
# 5th byte = always 0
# ================== Initialise ==========================================
self.writeBytes( self.makeByte() )
def isReady(self) :
'''
self.port1 = value
The software programmable output (SWPORT1) can be programmed to operate as a
tuning indicator output. As long as the IC has not completed a tuning action,
pin SWPORT1 remains LOW. The pin becomes HIGH, when a preset or search tuning is
completed or when a band limit is reached.
'''
def makeByte(self) :
self.block = np.zeros(5, dtype = np.int32)
self.block[0] = self.mute << 7 + \
self.search_mode << 6 + \
self.PLL % 2**6
self.block[1] = self.PLL // 2**6
self.block[2] = 2**7 * self.search_direction + \
2**6 * self.search_stop_level[0] + \
2**5 * self.search_stop_level[1] + \
2**4 * self.side_injection + \
2**3 * self.mono + \
2**2 * self.mute_right + \
2**1 * self.mute_left + \
2**0 * self.port1
self.block[3] = 2**7 * self.port2 + \
2**6 * self.stanby_mode + \
2**5 * self.band_limit + \
2**4 * self.clock_freq + \
2**3 * self.soft_mute + \
2**2 * self.high_cut_control + \
2**1 * self.stereo_noise_cancelling + \
2**0 * self.search_indicator
self.block[4] = 2**7 * self.pllref + \
2**6 * self.dtc
return self.block
def getFreq(self):
block = self.readBytes()
Npll_8_13 = block[0] // 0x3f
Npll_0_7 = block[1]*8**2
Npll= Npll_8_13 + Npll_0_7
F_rf= (Npll * self.Fref / 4) - self.Fif
return F_rf
def setFreq(self,newFreq, mute = 0, search_mode = 0) :
Npll = round( ( 4* (newFreq*10**6 + 225*10**3) ) / 32768 )
Npll_8_13 = Npll // 2**8
Npll_0_7 = Npll % 2**8
newBlock = np.zeros(2, dtype = np.int32)
newBlock = [Npll_8_13, Npll_0_7]
self.writeBytes(newBlock)
# self.PLL = int( 4 * (newFreq + self.Fif) / self.Fref )
# self.writeBytes(self.makeByte())
# print("set = " + str(self.PLL))
# print("la")
def readBytes(self):
with SMBusWrapper(1) as bus:
block = self.bus.read_i2c_block_data(self.addr, 0, 5)
return block
def writeBytes(self, data):
with SMBusWrapper(1) as bus:
self.bus.write_i2c_block_data(self.addr, data[0], data[1::])
TEA = tea5767()
time.sleep(1)
TEA.writeBytes([50,191,176,16,0])
time.sleep(1)
B = TEA.readBytes()
TEA.setFreq(102.5*10**6)
freq = 102.5*10**6
while 1 :
time.sleep(1)
a=input()
if a == "-" :
freq-=0.1*10**6
else :
freq+=0.1*10**6
TEA.setFreq(freq)
# freq2 = TEA.getFreq()
print("freq npt = " + str(freq/10**6))
# print("freq msr = " + str(freq2/10**6))
print("block = " + str(TEA.block))
print('===========================================================')
time.sleep(2)
TEA.bus.close() |
protocole i2c : bonne utilisation?
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