Pan bus
Cole Logan
Posts: 196
I have been working on my own little project for a little while· Its a Propeller area network. I had origanlly planed on using this for a home automation project that I had. But it has seens become a lot bigger then that.
The·idea of the bus is using two line for communication and one line for addressing.
The master pulls the Addrress line high when it wants to start talking to another slave. It then sends a byte containg the addess to the slave prop. The slave that has the address then responds by sending the address back to the master.·The master then pulls the address line back low. Then sends and recieves·any commands·and or data·with the slave. When it is done talking to the slave it sends 255.
So far I have tested the system with 1 master·up to 3 slaves.·My original test program was just to blink LED a set amount of times. I then add the ability to have it have one of the props do some math on the data passed·to it and then send the result back. That program is on the first attachment.
I then started to wondering if I could use it to control a TV that way I could get around the problem of not having enough memory to do a whole lot once you were driving a TV. I now have the slave running the TV driver and graphics driver with the abilitly to acces all the fuctions of the graphics driver. Though I still need to do some code shrinking because I only have enough room for a few pix.· This is in my secound attachment.
There are still a few things that I need to do. One of the big things is to add the abiltiy for the master to recognize that the slave is missing. and I want to make the slave recognize that the master has messed up and or is no longer present.
So tell me a what you guys think of it. Also if you have any way to improve it let me know.
The·idea of the bus is using two line for communication and one line for addressing.
3.3v
Master Prop TX ______|__________RX Slave Prop
3.3v
RX ______|__________TX
ADD _________________ADD
The master pulls the Addrress line high when it wants to start talking to another slave. It then sends a byte containg the addess to the slave prop. The slave that has the address then responds by sending the address back to the master.·The master then pulls the address line back low. Then sends and recieves·any commands·and or data·with the slave. When it is done talking to the slave it sends 255.
So far I have tested the system with 1 master·up to 3 slaves.·My original test program was just to blink LED a set amount of times. I then add the ability to have it have one of the props do some math on the data passed·to it and then send the result back. That program is on the first attachment.
I then started to wondering if I could use it to control a TV that way I could get around the problem of not having enough memory to do a whole lot once you were driving a TV. I now have the slave running the TV driver and graphics driver with the abilitly to acces all the fuctions of the graphics driver. Though I still need to do some code shrinking because I only have enough room for a few pix.· This is in my secound attachment.
There are still a few things that I need to do. One of the big things is to add the abiltiy for the master to recognize that the slave is missing. and I want to make the slave recognize that the master has messed up and or is no longer present.
So tell me a what you guys think of it. Also if you have any way to improve it let me know.
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