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71 lines
2.0 KiB
ReStructuredText
71 lines
2.0 KiB
ReStructuredText
AVR In-System Programming over WiFi for ESP8266
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===============================================
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This library allows an ESP8266 module with the HSPI port available to
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become an AVR In-System Programmer.
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Hardware
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--------
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The ESP8266 module connects to the AVR target chip via the standard
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6-pin AVR "Recommended In-System Programming Interface Connector Layout"
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as seen in `AVR910 <http://www.atmel.com/images/doc0943.pdf>`__ among
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other places.
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If the AVR target is powered by a different Vcc than what powers your
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ESP8266 chip, you **must provide voltage level shifting** or some other
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form of buffers. Exposing the pins of ESP8266 to anything larger than
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3.6V will damage it.
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Connections are as follows:
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+-----------+-------------+
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| ESP8266 | AVR / SPI |
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+===========+=============+
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| GPIO12 | MISO |
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+-----------+-------------+
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| GPIO13 | MOSI |
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+-----------+-------------+
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| GPIO14 | SCK |
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+-----------+-------------+
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| any\* | RESET |
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+-----------+-------------+
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For RESET use a GPIO other than 0, 2 and 15 (bootselect pins), and apply
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an external pullup/down so that the target is normally running.
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Usage
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-----
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See the included example. In short:
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.. code:: arduino
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// Create the programmer object
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ESP8266AVRISP avrprog(PORT, RESET_PIN)
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// ... with custom SPI frequency
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ESP8266AVRISP avrprog(PORT, RESET_PIN, 4e6)
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// Check current connection state, but don't perform any actions
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AVRISPState_t state = avrprog.update();
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// Serve the pending connection, execute STK500 commands
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AVRISPState_t state = avrprog.serve();
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License and Authors
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~~~~~~~~~~~~~~~~~~~
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This library started off from the source of ArduinoISP "sketch" included
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with the Arduino IDE:
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::
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ArduinoISP version 04m3
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Copyright (c) 2008-2011 Randall Bohn
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If you require a license, see
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http://www.opensource.org/licenses/bsd-license.php
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Support for TCP on ESP8266
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Copyright (c) Kiril Zyapkov <kiril@robotev.com>.
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