105 lines
3.3 KiB
Markdown
105 lines
3.3 KiB
Markdown
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# Software:
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If you haven't already installed the laptop-side software toolchain, see
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[Installing AVR Toolchain](Installing_AVR_Toolchain "wikilink") and come
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on back.
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# Hookup:
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- your laptop
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- an FTDI cable
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- the classboard, populated with chip and FTDI header
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The chips we use in class are pre-flashed with a bootloader, which means
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that you can program them over the AVR's serial port.
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Plug the FTDI cable into the board -- black wire to GND.
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<figure>
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<img src="_avr2011_cable_hookup.jpg" title="_avr2011_cable_hookup.jpg"
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width="500" />
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<figcaption>_avr2011_cable_hookup.jpg</figcaption>
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</figure>
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# Getting the Board Into Bootloader Mode
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When the chip starts up, the bootloader program checks if the "B" button
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(connected to PD2) is pressed. If the button is pressed, it sits and
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waits for programming data to come in over the serial line. If the
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button isn't pressed, it starts your program. So, what you want to do is
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reset the chip while the "B" button is pressed.
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To get the chip into ready-to-program Bootloader Mode:
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- Hold down the "B" button
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- Tap the "A" button (RESET)
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- Now you can release the "B" button
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You can tell you're in bootloader mode because your normal code won't be
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running. If you had and LED on or blinking, for instance, it won't be
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now.
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# Programming the Chip
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- Get the chip into bootloader mode
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- While you're in the directory with your code and the Makefile, type
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"make" or "sudo make" into the terminal
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- Your code will compile, and it will upload your code to the chip
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- The chip will automatically reset and start running your program
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If all is well, you will see
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avrdude: erasing chip
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avrdude: reading input file "LED_Demo.hex"
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avrdude: input file LED_Demo.hex auto detected as Intel Hex
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avrdude: writing flash (156 bytes):
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Writing | ################################################## | 100% 0.21s
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avrdude: 156 bytes of flash written
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avrdude: verifying flash memory against LED_Demo.hex:
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avrdude: load data flash data from input file LED_Demo.hex:
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avrdude: input file LED_Demo.hex auto detected as Intel Hex
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avrdude: input file LED_Demo.hex contains 156 bytes
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avrdude: reading on-chip flash data:
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Reading | ################################################## | 100% 0.19s
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avrdude: verifying ...
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avrdude: 156 bytes of flash verified
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avrdude: safemode: Fuses OK
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avrdude done. Thank you.
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# If there are errors...
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Common problems and their solutions include:
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- Permissions to write to USB port. Solution: keep typing "sudo make" or
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add yourself to the USB output group:
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Ubuntu: sudo usermod -a -G dialout yourNameHere
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<!-- -->
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- /dev/ttyUSB0 not found. Is the FTDI cable plugged in? Try "lsusb" to
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see if it's there. Try "ls /dev/ttyUSB\*" to see if it's registered as
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USB1. Edit Makefile accordingly, and remember that you'll probably
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have to change it back later.
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<!-- -->
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- Bugs in your code -\> failure to compile. If you get something like:
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`Compiling: LED_Demo.c`
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`LED_Demo.c: In function ???main???:`
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`LED_Demo.c:22: error: expected ???;??? before ???while???`
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`make: *** [LED_Demo.o] Error 1`
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you have an error in your code that's preventing compilation. Read the
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error output for hints, tweak your code, and try again. (In this case,
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I left out a ';' in line 20.)
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[Category:AVR_Class](Category:AVR_Class "wikilink")
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