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 progamming PCF8574 Kategorie: Programmierung Basic (von rien an harmelen - 22.11.2004 12:10)
Please, who can help me to program a  PCF8574. What is wrong in the program given below. I like to turn a stepper connnected to P4-P7 (of the PCF8574) when a switch) connected to P3 is depressed. P0/P3 are connected with a pull-up to 5V . By pressing the switch P3 will be connected with a pull-up to 5 V

define .......etc

SDA=on
SCL=on
zaehler=&B00001000

#loop
'reading ON/OFF of P3
gosub start
datenW=65
gosub I2C_write
gosub I2C_read
gosub Noack
gosub Stop
if datenR=&B00001111 then gosub motor else goto loop
goto loop

#motor
zaehler =zaehler shl 1
gosub start
datenW=64
gosub I2C_write
datenW=Zaehler
gosub I2C_write
gosub stop
if zaehler=&B10000000 then zaehler=&B00001000
return

#start
please refer to [1]

#stop
please refer to [1]

#I2C_write
please refer to [1]
read instead of daten : datenW

#I2C_read
please refer to [1]
read instead of daten: datenR  

#Ack
please refer to [1]

#Noack
please refer to [1]

[1] Messen, Steueren, Regeln mit dem C-Control/BASIC System von Kainka (page 163 u.w.)

thank you very much

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Bisherige Antworten:

Re: progamming PCF8574 (von Achim - 22.11.2004 15:27)
    Re: progamming PCF8574 (von rien an harmelen - 23.11.2004 9:25)
        Re: progamming PCF8574 (von Achim - 23.11.2004 11:07)
            Re: progamming PCF8574 (von rien an harmelen - 23.11.2004 17:33)
                Re: progamming PCF8574 (von Achim - 23.11.2004 18:04)
Re: progamming PCF8574 (von Carsten - 22.11.2004 15:18)
    Re: progamming PCF8574 (von rien an harmelen - 23.11.2004 9:52)
        Re: progamming PCF8574 (von Carsten - 23.11.2004 13:07)