Relay Plate Python Code ^{Relay Pi-Plate wiki (WikiPage)}
#**********************Relay import os import sys file_dir = os.path.dirname(__file__) sys.path.append(file_dir) from BASE import * #==============================================================================# # RELAY Functions # #==============================================================================# def relayON(addr,relay): VerifyADDR(addr) assert ((relay>=1) and (relay<=2)),"Relay number out of range. Must be between 1 and 2" relay -= 1 ppCMD(addr,0x10,relay,0,0) def relayOFF(addr,relay): VerifyADDR(addr) assert ((relay>=1) and (relay<=2)),"Relay number out of range. Must be between 1 and 2" relay -= 1 ppCMD(addr,0x11,relay,0,0) def relayTOGGLE(addr,relay): VerifyADDR(addr) assert ((relay>=1) and (relay<=2)),"Relay number out of range. Must be between 1 and 2" relay -= 1 ppCMD(addr,0x12,relay,0,0) def relayALL(addr,relays): VerifyADDR(addr) assert ((relays>=0) and (relays<=3)),"Argument out of range. Must be between 0 and 3" ppCMD(addr,0x13,relays,0,0) def relaySTATE(addr,relay): VerifyADDR(addr) assert ((relay>=1) and (relay<=2)),"Relay number out of range. Must be between 1 and 2" relay -= 1 resp=ppCMD(addr,0x14,relay,0,1) return resp[0] #***************************BASE import spidev import RPi.GPIO as GPIO baseADDR=48 ppNAME='TINKERplate' GPIO.setwarnings(False) GPIO.setmode(GPIO.BCM) baseADDR=48 MAXADDR=8 ppFRAME = 25 ppINT = 22 ppACK = 23 GPIO.setup(ppFRAME,GPIO.OUT) GPIO.output(ppFRAME,False) #Initialize FRAME signal time.sleep(.001) #pause to let Pi-Plate reset SPI HW if necessary GPIO.setup(ppINT, GPIO.IN, pull_up_down=GPIO.PUD_UP) GPIO.setup(ppACK, GPIO.IN, pull_up_down=GPIO.PUD_UP) try: spi = spidev.SpiDev() spi.open(0,1) except: print("Did you enable the SPI hardware interface on your Raspberry Pi?") print("Go to https://pi-plates.com/getting_started/ and learn how.") DataGood=False platesPresent = list(range(8)) def VerifyADDR(addr): assert ((addr>=0) and (addr<MAXADDR)),ppNAME+" address out of range" addr_str=str(addr) assert (platesPresent[addr]==1),"No "+ppNAME+" found at address "+addr_str def VerifyCHAN(chan): assert ((chan>=1) and (chan<9)),"Invalid channel number - must be between 1 and 8" def ppCMD(addr,cmd,param1,param2,bytes2return): global baseADDR global DataGood DataGood=True arg = list(range(4)) resp = [] arg[0]=addr+baseADDR; arg[1]=cmd; arg[2]=param1; arg[3]=param2; DataGood=True t0=time.time() wait=True while(wait): if (GPIO.input(ppACK)==1): wait=False if ((time.time()-t0)>0.05): #timeout wait=False DataGood=False if (DataGood==True): ppFRAME = 25 GPIO.output(ppFRAME,True) null=spi.xfer(arg,500000,5) #DataGood=True t0=time.time() wait=True while(wait): if (GPIO.input(ppACK)!=1): wait=False if ((time.time()-t0)>0.05): #timeout wait=False DataGood=False if (bytes2return>0) and DataGood: t0=time.time() wait=True while(wait): if (GPIO.input(ppACK)!=1): wait=False if ((time.time()-t0)>0.08): #timeout wait=False DataGood=False if (DataGood==True): for i in range(0,bytes2return+1): dummy=spi.xfer([00],500000,5) resp.append(dummy[0]) csum=0; for i in range(0,bytes2return): csum+=resp[i] if ((~resp[bytes2return]& 0xFF) != (csum & 0xFF)): DataGood=False GPIO.output(ppFRAME,False) return resp def getID(addr): global baseADDR VerifyADDR(addr) addr=addr+baseADDR id="" arg = list(range(4)) resp = [] arg[0]=addr; arg[1]=0x1; arg[2]=0; arg[3]=0; DataGood=True t0=time.time() wait=True while(wait): if (GPIO.input(ppACK)==1): wait=False if ((time.time()-t0)>0.05): #timeout wait=False DataGood=False if (DataGood==True): ppFRAME = 25 GPIO.output(ppFRAME,True) null=spi.xfer(arg,500000,50) #DataGood=True t0=time.time() wait=True while(wait): if (GPIO.input(ppACK)!=1): wait=False if ((time.time()-t0)>0.05): #timeout wait=False DataGood=False if (DataGood==True): count=0 csum=0 go=True while (go): dummy=spi.xfer([00],500000,40) if (dummy[0] != 0): num = dummy[0] csum += num id = id + chr(num) count += 1 else: dummy=spi.xfer([00],500000,40) checkSum=dummy[0] go=False if (count>25): go=False DataGood=False #print checkSum, ~checkSum & 0xFF, csum & 0xFF if ((~checkSum & 0xFF) != (csum & 0xFF)): DataGood=False GPIO.output(ppFRAME,False) return id def getADDR(addr): global baseADDR resp=ppCMD(addr,0x00,0,0,1) #print resp, DataGood; if (DataGood): return resp[0]-baseADDR else: return 8 def quietPoll(): global platesPresent ppFoundCount=0 for i in range (0,8): platesPresent[i]=0 rtn = getADDR(i) if (rtn==i): platesPresent[i]=1 ppFoundCount += 1 def RESET(addr): VerifyADDR(addr) resp=ppCMD(addr,0x0F,0,0,0) time.sleep(.10)
Last updated: 2019-12-07

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