{"id":1528,"date":"2021-02-04T16:26:04","date_gmt":"2021-02-04T14:26:04","guid":{"rendered":"http:\/\/www.fabienm.eu\/wordpress\/?p=1528"},"modified":"2021-06-05T07:56:49","modified_gmt":"2021-06-05T05:56:49","slug":"longan-nano-avec-le-jtag-et-openocd","status":"publish","type":"post","link":"https:\/\/www.fabienm.eu\/wordpress\/2021\/02\/04\/longan-nano-avec-le-jtag-et-openocd\/","title":{"rendered":"Longan Nano avec le JTAG et openocd"},"content":{"rendered":"\n

Dans l’article pr\u00e9c\u00e9dent<\/a> sur le sujet j’utilisai exclusivement le connecteur USB-C de la longan nano pour tout faire : alimenter la carte, communiquer et t\u00e9l\u00e9charger le firmware via le dfu<\/a>.<\/p>\n\n\n\n

\u00c7a permet de faire beaucoup de choses, mais il serait int\u00e9ressant de pouvoir poser des points d’arr\u00eat dans son code pendant le d\u00e9veloppement au moyen d’une sonde JTAG par exemple. Or la carte poss\u00e8de un header avec les signaux JTAG. C’est le moment de rentabiliser la sonde Sipeed USB-JTag <\/a>command\u00e9e en m\u00eame temps que la longan.<\/p>\n\n\n\n

Le branchement de la sonde sur la longannano est tr\u00e8s simple il suffit de brancher les signaux du m\u00eame nom entre eux avec des c\u00e2bles dupont femelle<\/a>:<\/p>\n\n\n\n

\"\"
L’adaptateur jtag de sipeed sipeed-rv-debugger branch\u00e9 sur la longan nano<\/figcaption><\/figure>\n\n\n\n

Tout d’abord, installons et compilons openocd pour le riscv :<\/p>\n\n\n

$ git clone<\/span> https:\/\/github.com\/bukinr\/riscv-openocd<\/span>\n$ cd riscv-openocd\n$ .\/bootstrap\n$ .\/configure\n$ make<\/code><\/span>Langage du code\u00a0:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Pour la suite de mes tests je me suis inspir\u00e9 du projet riscv-rust, m\u00eame si l’objectif premier n’est pas de faire du rust (c’est juste l’objectif second), le projet donne toutes les configurations utiles pour openocd.<\/p>\n\n\n
$ cd ..\n$ git clone<\/span> https:\/\/github.com\/riscv-rust\/longan-nano<\/span>\n$ cd longan-nano\n$ ..\/riscv-openocd\/src\/openocd -f sipeed-jtag.cfg -f openocd.cfg &\nOpen On-Chip Debugger 0.10<\/span>.0<\/span>+dev-00924<\/span>-g03cde8a0b (2021<\/span>-01<\/span>-14<\/span>-21<\/span>:26<\/span>)\nLicensed under GNU GPL v2\nFor<\/span> bug reports, read\n\thttp:\/\/openocd.org\/doc\/doxygen\/bugs.html<\/span>\nadapter speed: 8000<\/span> kHz\n\nInfo : clock speed 8000<\/span> kHz\nError: Can't run cJTAG reset escape sequences: TCK signal is not defined\nError: Can'<\/span>t run cJTAG reset escape sequences: TCK signal is not defined\nError: Can't run cJTAG reset escape sequences: TCK signal is not defined\nInfo : JTAG tap: riscv.cpu tap\/device found: 0x1e200a6d (mfg: 0x536 (Nuclei System Technology Co.,Ltd.), part: 0xe200, ver: 0x1)\nInfo : JTAG tap: auto0.tap tap\/device found: 0x790007a3 (mfg: 0x3d1 (GigaDevice Semiconductor (Beijing)), part: 0x9000, ver: 0x7)\nWarn : AUTO auto0.tap - use \"jtag newtap auto0 tap -irlen 5 -expected-id 0x790007a3\"\nInfo : datacount=4 progbufsize=2\nInfo : Examined RISC-V core; found 1 harts\nInfo :  hart 0: XLEN=32, misa=0x40901105\nInfo : Listening on port 3333 for gdb connections\nInfo : Listening on port 6666 for tcl connections\nInfo : Listening on port 4444 for telnet connections\n<\/span><\/code><\/span>Langage du code\u00a0:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Une fois le serveur openocd lanc\u00e9 on peu s’y connecter avec telnet par exemple :<\/p>\n\n\n
$ telnet localhost 4444<\/span>\nTrying<\/span> ::1.<\/span>..\nTrying 127.0<\/span>.0<\/span>.1<\/span>...\nConnected to localhost.\nEscape character is '^]'<\/span>.\nInfo : accepting 'telnet'<\/span> connection on tcp\/4444<\/span>\nOpen On-Chip Debugger\n> riscv.cpu curstate\nhalted\n> scan_chain\n   TapName             Enabled  IdCode     Expected   IrLen IrCap IrMask\n-- ------------------- -------- ---------- ---------- ----- ----- ------\n 0<\/span> riscv.cpu              Y     0x1e200a6d<\/span> 0x1e200a6d<\/span>     5<\/span> 0x01<\/span>  0x03<\/span>\n 1<\/span> auto0.tap              Y     0x790007a3<\/span> 0x00000000<\/span>     5<\/span> 0x01<\/span>  0x03<\/span>\n\n<\/code><\/span>Langage du code\u00a0:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
Pour l’utiliser avec VScode il y a quelques tricks \u00e0 savoir.<\/h3>\n\n\n\n
Tout d’abord les d\u00e9pendances :<\/p>\n\n\n
sudo apt install libhidapi-dev<\/code><\/span><\/pre>\n\n\n
Puis le probl\u00e8me de la librairies manquante :<\/p>\n\n\n
 <em<\/span>><\/span>cd \/usr\/lib\/x86_64-linux-gnu; sudo ln -s libmpfr.so libmpfr.so.6<\/em<\/span>><\/span><\/code><\/span>Langage du code\u00a0:<\/span> HTML, XML<\/span> (<\/span>xml<\/span>)<\/span><\/small><\/pre>\n\n\n
Et voila, vous devriez pouvoir faire de l’ex\u00e9cution pas \u00e0 pas de votre programme sur la Longan Nano d\u00e9sormais.<\/p>\n","protected":false},"excerpt":{"rendered":"
Dans l’article pr\u00e9c\u00e9dent sur le sujet j’utilisai exclusivement le connecteur USB-C de la longan nano pour tout faire : alimenter la carte, communiquer et t\u00e9l\u00e9charger le firmware via le dfu. \u00c7a permet de faire beaucoup de choses, mais il serait … Continuer la lecture →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[192,106,10,1],"tags":[235,219,237,218,238],"class_list":["post-1528","post","type-post","status-publish","format-standard","hentry","category-electronique","category-embarque","category-informatique","category-non-classe","tag-debug","tag-longan_nano","tag-openocd","tag-riscv","tag-vscode"],"_links":{"self":[{"href":"https:\/\/www.fabienm.eu\/wordpress\/wp-json\/wp\/v2\/posts\/1528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fabienm.eu\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fabienm.eu\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fabienm.eu\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fabienm.eu\/wordpress\/wp-json\/wp\/v2\/comments?post=1528"}],"version-history":[{"count":14,"href":"https:\/\/www.fabienm.eu\/wordpress\/wp-json\/wp\/v2\/posts\/1528\/revisions"}],"predecessor-version":[{"id":1634,"href":"https:\/\/www.fabienm.eu\/wordpress\/wp-json\/wp\/v2\/posts\/1528\/revisions\/1634"}],"wp:attachment":[{"href":"https:\/\/www.fabienm.eu\/wordpress\/wp-json\/wp\/v2\/media?parent=1528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fabienm.eu\/wordpress\/wp-json\/wp\/v2\/categories?post=1528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fabienm.eu\/wordpress\/wp-json\/wp\/v2\/tags?post=1528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Voila \u00e7a semble marcher sur l’ordinateur. Mais pour aller plus loin j’ai pr\u00e9f\u00e9r\u00e9 faire avec vscode<\/a>.<\/p>\n\n\n\n