Tidy up rfmtest.py to fix all flake8 errors
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1 changed files with 154 additions and 130 deletions
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# rfmtest.py - performs SPI comms on raspberry pi to RFM95 IC. Paul Richarsd pi@sosgez.co.uk
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#
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# NB this is python2 code. SPI data transfer does not use external driver.
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#
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import RPi.GPIO as GPIO
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from time import sleep
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#define GPIO board pin assignments for comms
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# define GPIO board pin assignments for comms
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def swait(): # just a short delay.
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sleep(0.001)
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def swait(): # just a short delay.
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sleep(0.001)
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def initports():
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global gclk,gout,gin,ginit,gen
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ginit=15 # was 3 # chip reset
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gclk=23 # CLOCK
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gout=19 # MOSI
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gin=21 # MISO
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gen=24 # chip enable (active low)
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GPIO.setmode(GPIO.BOARD)
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GPIO.setup(ginit,GPIO.OUT)
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GPIO.setup(gclk,GPIO.OUT)
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GPIO.setup(gout,GPIO.OUT)
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GPIO.setup(gen,GPIO.OUT)
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GPIO.setup(gin,GPIO.IN,pull_up_down = GPIO.PUD_UP)
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swait()
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# set default state
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GPIO.output(ginit,0)
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GPIO.output(gclk,0)
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GPIO.output(gout,0)
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GPIO.output(gen,1)
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GPIO.output(ginit,1)
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global gclk, gout, gin, ginit, gen
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ginit = 15 # wassyn 3 # chip reset
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gclk = 23 # CLOCK
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gout = 19 # MOSI
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gin = 21 # MISO
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gen = 24 # chip enable (active low)
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GPIO.setmode(GPIO.BOARD)
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GPIO.setup(ginit, GPIO.OUT)
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GPIO.setup(gclk, GPIO.OUT)
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GPIO.setup(gout, GPIO.OUT)
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GPIO.setup(gen, GPIO.OUT)
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GPIO.setup(gin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
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swait()
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# set default state
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GPIO.output(ginit, 0)
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GPIO.output(gclk, 0)
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GPIO.output(gout, 0)
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GPIO.output(gen, 1)
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GPIO.output(ginit, 1)
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# READY FOR 1 TRANSFER
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def xfr1(iswrite,address,data1): # SPI data transfer main routine. Single byte is transferred out and in
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global gen,gout,gin,gclk
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GPIO.output(gen,0)
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swait()
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swait()
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d1 = address & 127
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if iswrite>0:
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d1 = d1 | 128
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swait()
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m=128 # send MSB first
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for bit in xrange(8):
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if((d1 & m) >0):
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GPIO.output(gout,1)
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else:
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GPIO.output(gout,0)
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swait()
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GPIO.output(gclk,1)
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swait()
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GPIO.output(gclk,0)
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swait()
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m = (m >> 1) & 127
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m = 128
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d2 = data1
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res = 0
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for bit in xrange(8):
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if((d2 & m)>0):
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GPIO.output(gout,1)
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else:
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GPIO.output(gout,0)
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swait()
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res = res << 1
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GPIO.output(gclk,1)
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if(GPIO.input(gin)>0):
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res = res | 1
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swait()
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GPIO.output(gclk,0)
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swait()
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m = m >> 1
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GPIO.output(gen,1)
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swait()
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return res
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def xfr1(iswrite, address, data1):
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"""Main SPI data transfer routine. A single byte is transferred out and in."""
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global gen, gout, gin, gclk
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GPIO.output(gen, 0)
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swait()
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swait()
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d1 = address & 127
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if iswrite > 0:
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d1 = d1 | 128
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swait()
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m = 128 # send MSB first
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for bit in range(8):
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if((d1 & m) > 0):
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GPIO.output(gout, 1)
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else:
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GPIO.output(gout, 0)
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swait()
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GPIO.output(gclk, 1)
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swait()
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GPIO.output(gclk, 0)
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swait()
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m = (m >> 1) & 127
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m = 128
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d2 = data1
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res = 0
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for bit in range(8):
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if((d2 & m) > 0):
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GPIO.output(gout, 1)
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else:
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GPIO.output(gout, 0)
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swait()
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res = res << 1
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GPIO.output(gclk, 1)
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if(GPIO.input(gin) > 0):
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res = res | 1
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swait()
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GPIO.output(gclk, 0)
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swait()
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m = m >> 1
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GPIO.output(gen, 1)
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swait()
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return res
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def writeReg(where,data):
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xfr1(1,where,data)
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def writeReg(where, data):
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xfr1(1, where, data)
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def readReg(where):
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return xfr1(0,where,0)
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return xfr1(0, where, 0)
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def ex1(): # just exercising a pin so I can see it on scope
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global gclk, gout, gin, gen, ginit
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dt = 0.01
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port = gen
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for x in range(100):
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print(1)
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GPIO.output(port, 1)
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sleep(dt)
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print(0)
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GPIO.output(port, 0)
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sleep(dt)
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def ex1(): # just exercising a pin so I can see it on scope
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global gclk,gout,gin,gen,ginit
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dt = 0.01
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port = gen
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for x in xrange(100):
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print 1
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GPIO.output(port,1)
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sleep(dt)
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print 0
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GPIO.output(port,0)
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sleep(dt)
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def readregs():
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print "Reg Value"
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for x in xrange(0x44):
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res = -1
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v = xfr1(0,x,0)
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print '@',format(x,'02X'),
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print ' ',' $',format(v,'02X')
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print("Reg Value")
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for x in range(0x44):
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# res = -1
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v = xfr1(0, x, 0)
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print('@', format(x, '02X'))
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print(' ', ' $', format(v, '02X'))
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def GetOpMode():
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x = xfr1(0,1,0) # register 1 controls the RFM IC mode. eg FSK/LORA/SLEEP/STANDBY/TX/RX
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return x
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# register 1 controls the RFM IC mode. eg FSK/LORA/SLEEP/STANDBY/TX/RX
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x = xfr1(0, 1, 0)
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return x
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def GetRegBitRate():
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h = xfr1(0,2,0)
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l = xfr1(0,3,0)
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return h*256 + l
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h = xfr1(0, 2, 0)
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l_c = xfr1(0, 3, 0)
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return h * 256 + l_c
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def GetCarrierFreq():
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h = readReg(6) # MSB
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m = readReg(7)
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l = readReg(8) # LSB
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return ((h*256.0+m)*256.0 + l)*61.035 # in Hz
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h = readReg(6) # MSB
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m = readReg(7)
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l_a = readReg(8) # LSB
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return ((h * 256.0 + m) * 256.0 + l_a) * 61.035 # in Hz
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def SetFreq(mhz):
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f = int(mhz*1e6/61.035)
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h = int(f/65536.0)
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r = f-h*65536
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m = int(r/256)
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l = r-256*m
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writeReg(6,h) # MSB
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writeReg(7,m)
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writeReg(8,l) # LSB
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return
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f = int(mhz * 1e6 / 61.035)
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h = int(f / 65536.0)
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r = f - h * 65536
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m = int(r / 256)
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l_b = r - 256 * m
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writeReg(6, h) # MSB
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writeReg(7, m)
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writeReg(8, l_b) # LSB
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return
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def GetAGC():
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return xfr1(0,0x61,0) # or use readReg(0x61) etc
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return xfr1(0, 0x61, 0) # or use readReg(0x61) etc
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def GetAGC1():
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return xfr1(0,0x62,0)
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return xfr1(0, 0x62, 0)
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def GetAGC2():
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return xfr1(0,0x63,0)
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return xfr1(0, 0x63, 0)
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def GetAGC3():
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return xfr1(0,0x64,0)
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return xfr1(0, 0x64, 0)
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def ShowRegs():
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print' Some regsiter examples'
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print 'Op Mode ',GetOpMode()
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print 'Bit Rate ', GetRegBitRate()
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print 'Default carrier freq ',GetCarrierFreq()/1e6, ' MHz'
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print 'AGC regs 61-64 : ',format(GetAGC(),'02X'),format(GetAGC1(),'02X'),format(GetAGC2(),'02X'),format(GetAGC3(),'02X')
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print('Some regsiter examples')
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print('Op Mode ', GetOpMode())
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print('Bit Rate ', GetRegBitRate())
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print('Default carrier freq ', GetCarrierFreq() / 1e6, 'MHz')
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print(
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'AGC regs 61-64 : ',
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format(GetAGC(), '02X'),
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format(GetAGC1(), '02X'),
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format(GetAGC2(), '02X'),
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format(GetAGC3(), '02X')
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)
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def main():
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print ('Simple GPIO SPI without drivers')
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sleep(0.5) # secs
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initports()
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readregs() # shows massive list, before any changes are made
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ShowRegs() # shows a few interesting registers
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SetFreq(868.1) # now write to registers 6,7,8
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print 'New carrier freq ',GetCarrierFreq()/1e6, ' MHz'
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print ("*** Finished")
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GPIO.cleanup()
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print('Simple GPIO SPI without drivers')
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sleep(0.5) # secs
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initports()
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readregs() # shows massive list, before any changes are made
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ShowRegs() # shows a few interesting registers
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SetFreq(868.1) # now write to registers 6, 7, 8
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print('New carrier freq ', GetCarrierFreq() / 1e6, ' MHz')
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print("*** Finished")
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GPIO.cleanup()
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main()
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