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> > Please, who can help me to program a PCF8574. What is wrong in the program given below. > > What makes you think, there is something wrong? In other words: please describe what you do, what you observe then and what you'd expect instead. > > > 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 > > Shouldn't the switch connect P3 rather with 0V? > > > please refer to [1] > > please refer to [1] > > please refer to [1] > > > [1] Messen, Steueren, Regeln mit dem C-Control/BASIC System von Kainka (page 163 u.w.) > > Do you expect everyone to own this book? > > Bye > Achim Hallo Achim Question 1 I think there is someting wrong because by pressing the switch P3 the stepper does not turn, as I have in mind. Question2 Even connecting the switch to 0V (ground) does not have any result. Question 3 #start SDA=OFF SCL=OFF return #stop SDA=OFF SCL=ON SDA=ON return #I2C_write for n=1 to 8 SDA=OFF if (DatenW and 128) =128 then SDA=ON pulse SCL DatenW=DatenW shl 1 next pulse SCL return I2C_read DatenR=0 deact SDA for n=1 to 8 DatenR=DatenR shl 1 SCL=ON if SDA then DatenR=DatenR+1 SCL=OFF next return #Ack SDA=0 pulse SCL return #NoAck SDA=1 pulse SCL return end I hope you an solve my problem kind regards rien an harelen |
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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)