OpenOCD小ネタ17 -CMSIS-DAPに本来の力を-
まずはこのぶろぐのアクセス数推移のグラフを見ていただきい。
東海自然歩道関連の記事の更新も一区切りが着き、OpenOCDの解説に力を
入れはじめた(中央矢印)とたんにアクセスがガタ落ちになっていますorz
"わかりやすい解説をしていただけるとありがたいです"との多数の要望を
受け始めたOpenOCD小ネタですが、ねむいさんがこちらでやったアドバイスが
効き過ぎて皆CoIDEとかに移ってしまった模様ですが、これはこれで(開発環境の
整備ごときに)無駄な時間浪費するような被害が減ってよかったのではないか、
ねむいさんは安心して近畿自然歩道とか東海自然歩道の記事更新をしまくれば
みんな幸せになれるんじゃないかなぁと思いましためでたしめでたし。
で終わってもあまりめでたくないので2015年度はちょっと毛色を変えてくどい
解説は極力排除して面白おかしく斜め45度に傾いた記事を書いていくポリシーを
取っております。
ていうわけで本題です！
●CMSIS-DAP(を制御する側)パワーアップ大作戦
現在ではCortex-Mxコアのデバッグに欠かせなくなったCMSIS-DAPですが昨年より
OpenOCDからも使用可能となっています。しかしながらOpenOCD側の実装と
CMSIS-DAPが使用しているUSBのHIDクラスの関係上フラッシュ書き込み速度が
USBハイスピード接続でもMAXで2kByte/Sec程度しか出ない、LPC11U35版の
ファームにいたっては0.8kByte/Sec以下まで書き込みスピードが落ちるという
極めて不利な弱点がありました。
昨年の秋口からこのﾁﾏﾁﾏ書き込みしか利用できないOpenOCD側の実装を何とか
しようとあの手この手のアイデアが議論され、書き込み命令をキューイング
してCMSIS-DAPに元から実装されていたが使用されていなかったブロック転送
コマンドで一気にドカンと転送する作戦が取られました。
CMSIS-DAPの元となるファームウエアは同じながらも各ベンダ間で独特の癖が
ある拡張に苦戦しましたが、今春ようやく殆どの問題が解消され正式にマージされる
運びとなりました。
説明はこれくらいにして早速威力を見てもらいましょう。
テストで使用した基板はLPC1549Xpressoです。
これにはUSBハイスピードで繋がるLPCXpressoV2ハードウエアが載っています。
> "C:¥Devz¥Coreutils¥bin¥make.exe" program
openocd -s C:/Devz/ARM/OCD/tcl -f interface/cmsis-dap.cfg -f target/lpc1549_swd_flash.cfg -c "mt_flash main.elf"
Open On-Chip Debugger 0.9.0-dev-00314-g90ae846-dirty (2015-03-01-09:33)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.sourceforge.net/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'cmsis-dap'
none separate
cortex_m reset_config sysresetreq
adapter speed: 1000 kHz
Info : CMSIS-DAP: SWD Supported
Info : CMSIS-DAP: JTAG Supported
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : CMSIS-DAP: FW Version = 1.0
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 1 TDO = 1 nTRST = 0 nRESET = 1
Info : DAP_SWJ Sequence (reset: 50+ '1' followed by 0)
Info : CMSIS-DAP: Interface ready
Info : clock speed 1000 kHz
Info : IDCODE 0x2ba01477
Info : lpc1549.cpu: hardware has 6 breakpoints, 4 watchpoints
target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x030000b8 msp: 0x02001fe0
auto erase enabled
wrote 8192 bytes from file main.elf in 16.749893s (0.478 KiB/s)
verified 8172 bytes in 4.593720s (1.737 KiB/s)
shutdown command invoked> "C:¥Devz¥Coreutils¥bin¥make.exe" program
openocd -s C:/Devz/ARM/OCD/tcl -f interface/cmsis-dap.cfg -f target/lpc1549_swd_flash.cfg -c "mt_flash main.elf"
Open On-Chip Debugger 0.9.0-dev-00357-g09ca5af-dirty (2015-03-31-00:00)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.sourceforge.net/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'swd'
none separate
cortex_m reset_config sysresetreq
adapter speed: 1000 kHz
Info : CMSIS-DAP: SWD Supported
Info : CMSIS-DAP: JTAG Supported
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : CMSIS-DAP: FW Version = 1.0
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 1 TDO = 1 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready
Info : clock speed 1000 kHz
Info : SWD IDCODE 0x2ba01477
Info : lpc1549.cpu: hardware has 6 breakpoints, 4 watchpoints
target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x030000b8 msp: 0x02001fe0
auto erase enabled
wrote 8192 bytes from file main.elf in 0.578121s (13.838 KiB/s)
verified 8172 bytes in 0.140624s (56.750 KiB/s)
shutdown command invoked
同じUSB2.0ホストで試しましたがご覧のとおり約10倍以上速くなってますね♥
> "C:¥Devz¥Coreutils¥bin¥make.exe" program
openocd -s C:/Devz/ARM/OCD/tcl -f interface/cmsis-dap.cfg -f target/lpc1549_swd_flash.cfg -c "mt_flash main.elf"
Open On-Chip Debugger 0.9.0-dev-00357-g09ca5af-dirty (2015-03-31-00:00)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.sourceforge.net/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'swd'
none separate
cortex_m reset_config sysresetreq
adapter speed: 1000 kHz
Info : CMSIS-DAP: SWD Supported
Info : CMSIS-DAP: JTAG Supported
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : CMSIS-DAP: FW Version = 1.0
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 1 TDO = 1 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready
Info : clock speed 1000 kHz
Info : SWD IDCODE 0x2ba01477
Info : lpc1549.cpu: hardware has 6 breakpoints, 4 watchpoints
target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x030000b8 msp: 0x02001fe0
auto erase enabled
wrote 8192 bytes from file main.elf in 0.468747s (17.067 KiB/s)
verified 8172 bytes in 0.124999s (63.844 KiB/s)
shutdown command invokedLPC824MAXやトラ技ライタのCMSIS-DAPで使用されているLPC11U35はフル
スピードまでで、尚且つメモリリソースがかなり少ないながらもキューイングの
恩恵に多少あやかることができ、こちらもパフォーマンスの若干の向上が見られました。
> "C:¥Devz¥Coreutils¥bin¥make.exe" program
openocd -s C:/Devz/ARM/OCD/tcl -f interface/cmsis-dap.cfg -f target/lpc82x_swd_flash.cfg -c "mt_flash main.elf"
Open On-Chip Debugger 0.9.0-dev-00314-g90ae846-dirty (2015-03-01-09:33)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.sourceforge.net/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'cmsis-dap'
none separate
cortex_m reset_config sysresetreq
adapter speed: 1000 kHz
Info : CMSIS-DAP: SWD Supported
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : CMSIS-DAP: FW Version = 1.0
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1
Info : DAP_SWJ Sequence (reset: 50+ '1' followed by 0)
Info : CMSIS-DAP: Interface ready
Info : clock speed 1000 kHz
Info : IDCODE 0x0bc11477
Info : lpc82x.cpu: hardware has 4 breakpoints, 2 watchpoints
target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0xf1000000 pc: 0x1fff0008 msp: 0x10000ffc
auto erase enabled
wrote 8192 bytes from file main.elf in 10.484308s (0.763 KiB/s)
verified 7948 bytes in 0.640621s (12.116 KiB/s)
shutdown command invoked> "C:¥Devz¥Coreutils¥bin¥make.exe" program
openocd -s C:/Devz/ARM/OCD/tcl -f interface/cmsis-dap.cfg -f target/lpc82x_swd_flash.cfg -c "mt_flash main.elf"
Open On-Chip Debugger 0.9.0-dev-00357-g09ca5af-dirty (2015-03-31-00:00)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.sourceforge.net/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'swd'
adapter speed: 10 kHz
adapter_nsrst_delay: 200
cortex_m reset_config sysresetreq
adapter speed: 1000 kHz
Info : CMSIS-DAP: SWD Supported
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : CMSIS-DAP: FW Version = 1.0
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready
Info : clock speed 1000 kHz
Info : SWD IDCODE 0x0bc11477
Info : lpc8xx.cpu: hardware has 4 breakpoints, 2 watchpoints
target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0xf1000000 pc: 0x1fff0008 msp: 0x10000ffc
auto erase enabled
wrote 8192 bytes from file main.elf in 4.718719s (1.695 KiB/s)
verified 7948 bytes in 0.406248s (19.106 KiB/s)
shutdown command invoked尤もLPC824でもフラッシュ容量は最大32kByte程度なので2kByte/Secでもそこまで
困らないかと思います。
トラ技で配布しているmbed版ではないほうのLPC11U35向けCMSIS-DAP
ファームウェアを使用すればマスストレージに使用していたメモリリソースが
使用できるのでさらにちょっとだけ速度が上がります。
そんなわけで弱点だったCMSIS-DAPの書き込み速度は実用レベルにまで改善したので
OpenOCDからCMSIS-DAPをびしばし使い倒すことができるようになりました。
これでXPresso系のボードの開発もスムーズに進められると思います！
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