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AVR cycles

Avr cycles allows you to decorate an object dump with the cyles used per instruction.

Example

Decorate instructions with MCU cycles:

Normal Translated
[...] [...]
ISR(TIMER1_COMPA_vect) { ISR(TIMER1_COMPA_vect) {
2b8: 1f 92 push r1 2b8: 1f 92 [[PUSH -> 2]] r1
2ba: 0f 92 push r0 2ba: 0f 92 [[PUSH -> 2]] r0
2bc: 0f b6 in r0, 0x3f ; 63 2bc: 0f b6 [[IN -> 1]] r0, 0x3f ; 63
2be: 0f 92 push r0 2be: 0f 92 [[PUSH -> 2]] r0
2c0: 11 24 eor r1, r1 2c0: 11 24 [[EOR -> 1]] r1, r1
2c2: 0b b6 in r0, 0x3b ; 59 2c2: 0b b6 [[IN -> 1]] r0, 0x3b ; 59
2c4: 0f 92 push r0 2c4: 0f 92 [[PUSH -> 2]] r0
2c6: 8f 93 push r24 2c6: 8f 93 [[PUSH -> 2]] r24
2c8: 9f 93 push r25 2c8: 9f 93 [[PUSH -> 2]] r25
2ca: ef 93 push r30 2ca: ef 93 [[PUSH -> 2]] r30
2cc: ff 93 push r31 2cc: ff 93 [[PUSH -> 2]] r31
[...] [...]

Translate Instructions to Cycles

  • compile your source

  • translate the dump

      avr-objdump -zS source.elf | python avr-cycles.py

The script simply replaces instructions found in the .csv table line by line.

Obtain new Cycle Tables

  • convert the manual to text

      pdftotext -layout atmel-xxx-datasheet.pdf foo.txt

  • grab the 1st and last column of the instruction set summary section (i.e. block selection with Geany: ctrl + shift + click)

  • store the columns to

      instruction-tables/atmel-xxx-xxx.csv

  • eventualy send me a pull request

Configuration - avr-cycles.conf

Modify the instructionTable field for your needs:

    {
        "instructionTablesFolder" : "instruction-tables",
        "instructionTable" : "atmel-2549-8-bit-avr-microcontroller-atmega640-1280-1281-2560-2561.csv",
        "___instructionTable" : "atmel-8303-8-bit-avr-microcontroller-tinyavr-attiny1634.csv"
    }