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Raws li kev siv cov cuab yeej sib txawv, IC decryption programming txoj kev thiab cov tseev kom muaj ntawm cov ntawv sau kuj sib txawv.

Ib txoj kev yog siv cov txheej txheem ntawm programmer, yog tias siv cov programmer dav dav, feem ntau txhawb BIN lossis HEX cov ntaub ntawv, thauj ncaj qha rau cov ntaub ntawv, thiab tom qab ntawd sib txuam teeb tsa, koj tuaj yeem hlawv ncaj qha.

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Thib ob, lwm txoj hauv kev yog siv ISP lossis JTAG rub tawm kab hom los sau cov ntawv, vim tias muaj ntau yam kab rub tawm, kab rub tawm dav dav yog txhawb hauv AVRSTUDIO rub tawm, STUDIO rub tawm, hom ntawv yuav tsum muaj yuav tsum yog HEX Cov qauv ntaub ntawv , yog tias thauj hauv BIN cov ntaub ntawv, yuav tsis yog AVRSTUDIO txhawb hom ntawv. Thiab xav tau cov ntaub ntawv FLASH thiab EEPROM yog rub tawm ib qho, uas yog, tom qab kev txiav txim siab muab FLASH thiab EEPOM ob cov ntaub ntawv.

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AVR microcontrollers IC decryption muaj ntau txheej fuse cov chaw ntsig txog cov cuab yeej teeb tsa thiab kev ua haujlwm ib puag ncig. Cov fuses no tseem ceeb heev. Cov neeg siv tuaj yeem tsim teeb tsa thiab teeb tsa lub Fuse kom ua rau AVR microcontroller sib txawv hauv cov xwm kom haum rau cov ntawv thov siv. Tab sis vim tias yuav tsum tau kho lub fuse, rau cov pib kom coj qee yam tsis nkag siab txog ntawm qhov chaw, tom qab txiav cov microcontroller, qhov kev zov me nyuam nyob rau lub sijhawm hlawv, tab sis kuj nyob rau lub fuse configuration, yog hais tias lub teeb tsa tsis raug, tej zaum tsis Ua haujlwm lossis hloov haujlwm. Tag nrho hauv qhov hlawv cov decrypted cov ntaub ntawv thaum lub fuse yuav tsum tau teeb tsa, vim hais tias cov cuab yeej los txhawb AVR yog ntau heev, thiab cov cuab yeej sib txawv ntawm software interface tau sib txawv, yog li ua qhov zoo tshaj plaws hauv AVR microcontroller decryption ua ntej deciphering lub tuam txhab nws tus kheej Dab tsi cov cuab yeej yog siv, kom cov tuam txhab chip decryption nyob rau hauv raws li lawv tus kheej cov cuab yeej los ua interface daim ntawv qhia, yog li yooj yim rau decrypt tom qab qhov kev pab cuam hlawv, tab sis lawv kuj tuaj yeem siv lub tuam txhab decryption muab cov qauv los nyeem cov fuse configuration, thiab qee qhov Cov cuab yeej tuaj yeem nyeem nti ncaj qha, qee qhov nyeem nyeem teeb, thiab lwm yam, thiab tom qab ntawd nyeem tawm cov teeb tsa tau txais kev cawmdim.

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PCB-PCBA-assembly

Yog tias nws tsuas yog lub Hoobkas ib leeg xwb, lub neej ntawd yog siv sab hauv 1MHZ RC oscillation raws li lub kaw lus moos, thiab JTAG chaw nres nkoj yog nyob hauv hom pom zoo. Txog rau AVR fuse tsawg kawg kom pom cov ntsiab lus hauv qab no.

1, AVR fuse tuaj yeem tsim tau ob peb zaug, tsis yog ib zaug OTP fuse.

2, AVR chip encryption lock (LB2 / LB1 = 1 / 0,0 / 0) tsis tuaj yeem nyeem cov nti los ntawm cov ntaub ntawv FLASH thiab EEPROM, tab sis cov xwm txheej ntawm fuse tseem tuaj yeem nyeem tau, tab sis tsis tuaj yeem hloov kho Kev Siv.

3, fuse me ntsis kev teeb tsa tuaj yeem ua tiav nyob rau thaum mus tib seem, ISP thiab JTAG serial hom.

4, rub tawm cov kauj ruam kom raug yog: hauv lub nti tsis kaw lub nti los rub cov txheej txheem khiav thiab cov ntaub ntawv, teeb tsa cov fuse sib thooj, thiab thaum kawg teeb tsa lub nti encryption qhov chaw.

5, nti hais kom ua daim tawv yog mus rau FLASH thiab EEPROM cov ntaub ntawv kom meej, thiab tib lub sijhawm ob-ntsis xauv lub xwm txheej tau teeb tsa kom tsis muaj lub xeev kaw (LB2 / LB1 = 1/1), tab sis cov lus txiav hais txog lub nti tsis hloov lwm yam fuse Bit xeev.

6, thiab tseem ceeb dua yog lub BOOTRST ntsis, qhov no teeb tsa txoj kev sib raug zoo ntawm lub nti tom qab fais fab kev pab cuam los ntawm 0X0000 lossis los ntawm thaj chaw BOOT pib siv. Kev xaiv ntawm lub kaw lus moos qhov tseem ceeb yog qhov tseem ceeb, tom qab kev xoos lub program thaum tus neeg siv khoom feem ntau tsis yooj yim siv, ua si ib feem ntawm lub moos qhov teeb tsa tsis tau teeb tsa vim yog vim li cas, yog li lub kaw lus moos yuav tsum ua raws li thawj chaw.

7, xav kom pom tseeb tias SPIEN lub ntsis, ntau tus neeg muas zaub tau sib tham hauv xov tooj, uas yog, peb muab microcontroller tsis tuaj yeem txuas nrog ISP, thiab tuaj yeem yuav lawv tus kheej, lub fuse rau SPIEN yog teeb kho ISP , yog tias SPIEN yog 1, ISP raug tso cai xeev, yog tias nws yog 0 txwv tsis pub lub xeev, yog tias nws raug txwv tsis pub muaj lub xeev, tsis tuaj yeem ISP chaw nres nkoj nti.

8, lub nti tau muab zais thiab muab xauv, yog pom tias fuses thiab kev teeb tsa tsis raug, koj yuav tsum siv lub lwv tshem tawm cov lus qhia kom tshem tawm cov ntaub ntawv hauv lub nti, txiav txim siab tawm lub encryption xauv, thiab tom qab ntawv rov rub tus lej ntawm tus lej khiav thiab cov ntaub ntawv, hloov kho configuration-hais txog fuses, Thiab thaum kawg rov kho lub nti lub encryption xauv me ntsis.

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Sijhawm Post: Dec-07-2020