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Step 6PIC
I used a dsPIC30F2011. These and many other PICs can be sampled from Microchip's site at http://sample.microchip.com/
I used a dsPIC instead of a normal PIC because
1. It can run on 3.3V that is provided by the iPod
2. It has 8 I/O ports for all of the buttons
3. It has an easy to program UART module, which can send data to the iPod with no conversion needed.
4. I already had one and a programmer.
Any other microcontroller that you know how to use and meets these requirements can be substituted, but the wiring will be different.
The downside of using a dsPIC is that the programmer is quite expensive (The ICD2 is now $160). There are free tools at http://homerreid.ath.cx/misc/dspicprg/ that can be used with a homemade JDM programmer, but I have never attempted this.
The zipped files are the code for the PIC. It is a project in Microchip's freely available MPLAB IDE . If you want to modify it or recompile it, you will also need Microchip's C Compiler , which has a free student edition. These can be used to generate the neccesary hex file (also in the zip) for programming with MPLAB or the aforementioned JDM programmer.
The code samples the I/O ports 64 times per second, and if there is any change, sends various commands over serial to the iPod.
I used publicly available documentation on the Apple Accessory Protocol (AAP, or iAP) to write the code, and it is talked about at http://www.adriangame.co.uk/ipod-acc-pro.html and http://nuxx.net/wiki/Apple_Accessory_Protocol
Up, down, left, and right are volume up, volume down, previous song, and next song, respectively. A plays/pauses the music, while B stops it. The select button mutes, and the Start button, when held, enables you to control the iPod's interface directly. With start held, up and down scroll the wheel, and A and B operate the iPod's select and menu buttons.
I used a dsPIC instead of a normal PIC because
1. It can run on 3.3V that is provided by the iPod
2. It has 8 I/O ports for all of the buttons
3. It has an easy to program UART module, which can send data to the iPod with no conversion needed.
4. I already had one and a programmer.
Any other microcontroller that you know how to use and meets these requirements can be substituted, but the wiring will be different.
The downside of using a dsPIC is that the programmer is quite expensive (The ICD2 is now $160). There are free tools at http://homerreid.ath.cx/misc/dspicprg/ that can be used with a homemade JDM programmer, but I have never attempted this.
The zipped files are the code for the PIC. It is a project in Microchip's freely available MPLAB IDE . If you want to modify it or recompile it, you will also need Microchip's C Compiler , which has a free student edition. These can be used to generate the neccesary hex file (also in the zip) for programming with MPLAB or the aforementioned JDM programmer.
The code samples the I/O ports 64 times per second, and if there is any change, sends various commands over serial to the iPod.
I used publicly available documentation on the Apple Accessory Protocol (AAP, or iAP) to write the code, and it is talked about at http://www.adriangame.co.uk/ipod-acc-pro.html and http://nuxx.net/wiki/Apple_Accessory_Protocol
Up, down, left, and right are volume up, volume down, previous song, and next song, respectively. A plays/pauses the music, while B stops it. The select button mutes, and the Start button, when held, enables you to control the iPod's interface directly. With start held, up and down scroll the wheel, and A and B operate the iPod's select and menu buttons.
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Mar 8, 2008. 9:24 PMspikerbond
says:
what microcontroller? there are four different ones with 18 leads
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Mar 9, 2008. 12:18 AM
Senator Penguin (author)
says:
Senator Penguin (author)
says:
I used the dsPIC30F2011, but with minor changes to the code (pin numbers and speed of the chips are the only relevant differences that come to mind), almost any other dsPIC30 microcontrollers could be substituted. If you are more comfortable with other platforms, the hardest part of the process is understanding the Apple Accessory Protocol, the rest is pretty straightforward.
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