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The test.py is the Python module that handles all of the operations of the Pi AVR Programmer HAT. Let's take a closer look at the most important ones. There are quite a few that are extra examples and will show you some more of the advanced features of this programmer. However, you don't actually need all of them to get up and running.
To route those signals between devices, there are two standardized connectors - one 10-pin, 2x5 connector and another 6-pin, 2x3 connector: There are six unique signals required for communication between ISP and AVR: Label Boxes - These blank white silk-screen boxes are handy for labeling your Pi with a project name and version of your loaded hex file.ĪVRs are programmed through an SPI interface. Status LEDS - Used for indicating power, success and/or fail for various stages of programming. Simply tap with your finger and that will trigger the onboard capsense ATQ421010 IC which is connected to a GPIO on the Pi. Wait for it to stop blinking, then you can remove power.Ĭapsense Pad - Use this to engage programming. It is located inside the enclosure next to the power LED. After you engage a shut down, please watch the “active” LED on the Raspberry Pi.
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It could be used for other things, but the Python module running the Pi AVR Programmer HAT (test.py) is watching this line to engage a full shutdown of the Pi. Note: This is simply a momentary button on a GPIO pin. Shutdown Button - Hold this down for 6 seconds to shut down your Pi. SPI Interface Adapter (2x3 header) - This adapter mates easily with the standard ISP header found on most AVR boards. You can also opt to remove the supplied jumper cable, and wire up to your target with your own jumper wires or custom adapter. This 1圆 cable and adapter solution is much more robust. Most programmers use ribbon cables, which will fail after so many insertions. This is in a 1圆 straight header format, so it will mate nicely with your 6-pin Jumper wire. SPI Interface (1圆 header) - These headers provide optional direct access to the SPI lines. Isolation Switch IC - The multiplexer IC that disconnects the SPI lines from your Pi to the Target. Closing more than one jumper will damage your Raspi. Please only close one of these jumpers at a time. Also note that the 3.3V and 5V options are provided from those voltages on the Raspi 2x20 headers. "TARGET" is the default setting for this jumper. Note: The "TARGET" option means that the target IC will provide the logic level reference voltage.
Speed Test - We take the HAT for a speed test and see just how fast it goes!.A nice one-click solution for programming your Arduino with the speed of ISP.
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It's split into a series of sections, which cover: In this tutorial we will introduce you to all of the important aspects of the Pi AVR Programmer HAT.
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This means you can leave RX and TX connected during development and re-program your AVR with new code without un-plugging and re-plugging any of your programming lines. Instead, it uses MOSI/MISO/SCK/RESET - Arduino pins D11/D12/D13/RESET. ISP programming does not require using these pins.