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att13a-osccal's Introduction

ATTiny13A 内部オシレータ簡易キャリブレーションツール

ATTiny13Aの内部オシレータのキャリブレーションを行うための簡易なツールです。 ATTiny13A以外でも多分使えます。

環境

  • OSX Yosemite
  • USB-UARTコンバータ
  • CrossPack AVR
  • Perl(Carton)
  • AVRISP MK2

配線

PB1(6番ピン)をUSB-SerialアダプタのRXに接続します。

ATTiny13Aへのインストール

$ make
$ make fuse
$ make flash

フィルタツールの実行

$ cd Reciever
$ carton install
$ carton exec ./serial.pl /dev/cu.usbserial-XXXXXX

***** OSCCAL=92 *****
***** OSCCAL=93 *****
***** OSCCAL=94 *****
***** OSCCAL=95 *****
***** OSCCAL=96 *****
***** OSCCAL=97 *****
***** OSCCAL=98 *****
***** OSCCAL=99 *****
***** OSCCAL=100 *****

しばらくすると上のように表示されます。うまく表示される連番のOSCCALの真ん中あたりの数字がだいたいいい感じの値です。この場合96くらい。このOSCCALの値を新しく作成するプログラムのmain() の最初のほうに OSCCAL=96; みたいな感じで書きます。

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