36 lines
1.4 KiB
Markdown
Executable File
36 lines
1.4 KiB
Markdown
Executable File
So you want to program an AVR, but you don't have a programmer? Do you
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have a parallel port? Then fear not!
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The AVR chips are set up to flash their program memory through a serial
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connection with the host computer, so programming them is mostly a
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matter of getting the right lines to the chip, with the rest taken care
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of by the AVRdude software.
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The simplest way to get started is with one of the parallel-port
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"programmers". The basic procedure is to a) look at the docs for
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AVRdude's various parallel port adapters, b) look at the pinouts for the
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chip you're using, and c) wire the right pins on the parallel port to
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the right pins on your AVR.
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For instance, the DAPA (Direct AVR Parallel Access) "programmer" makes
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the following connections between the parallel port pins and the AVR:
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| Parallel Pin | AVR |
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|--------------|-------|
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| 1 | SCK |
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| 2 | MOSI |
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| 11 | MISO |
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| 16 | RESET |
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| 20 | GND |
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| 21 | GND |
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Connect the wires and test it out! Type **avrdude -n -v -p tiny13 -c
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dapa** and you should see your part recognized and the fuse settings
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displayed. (Make sure to substitute your part name for tiny13. Type
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**avrdude -p help** to see the list of supported parts.)
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For a much more complicated boot strap technique, there is the [secure
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bootloader](secure_bootloader "wikilink") that uses AES encrypted
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firmware images.
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[Category: AVR Tutorial](Category:_AVR_Tutorial "wikilink") |