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207 lines
4.3 KiB
Markdown
207 lines
4.3 KiB
Markdown
# I2C
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{{#include ../../banners/hacktricks-training.md}}
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## Bus Pirate
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Da biste testirali da li Bus Pirate radi, povežite +5V sa VPU i 3.3V sa ADC i pristupite bus pirate-u (koristeći Tera Term na primer) i upotrebite komandu `~`:
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```bash
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# Use command
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HiZ>~
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Disconnect any devices
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Connect (Vpu to +5V) and (ADC to +3.3V)
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Space to continue
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# Press space
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Ctrl
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AUX OK
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MODE LED OK
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PULLUP H OK
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PULLUP L OK
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VREG OK
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ADC and supply
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5V(4.96) OK
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VPU(4.96) OK
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3.3V(3.26) OK
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ADC(3.27) OK
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Bus high
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MOSI OK
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CLK OK
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MISO OK
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CS OK
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Bus Hi-Z 0
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MOSI OK
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CLK OK
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MISO OK
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CS OK
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Bus Hi-Z 1
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MOSI OK
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CLK OK
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MISO OK
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CS OK
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MODE and VREG LEDs should be on!
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Any key to exit
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#Press space
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Found 0 errors.
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```
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Kao što možete videti u prethodnoj komandnoj liniji, rečeno je da nije pronađena nijedna greška. Ovo je veoma korisno da se zna da funkcioniše nakon kupovine ili nakon flešovanja firmvera.
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Da biste se povezali sa bus pirate, možete pratiti dokumentaciju:
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.png>)
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U ovom slučaju, povezaću se sa EPROM-om: ATMEL901 24C256 PU27:
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.png>)
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Da bih razgovarao sa bus pirate, koristio sam Tera Term povezan na COM port bus pirata sa podešavanjem --> Serijski port --> Brzina od 115200.\
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U sledećoj komunikaciji možete pronaći kako pripremiti bus pirate za razgovor I2C i kako pisati i čitati iz memorije (Komentari se pojavljuju koristeći "#", ne očekujte taj deo u komunikaciji):
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```bash
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# Check communication with buspirate
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i
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Bus Pirate v3.5
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Community Firmware v7.1 - goo.gl/gCzQnW [HiZ 1-WIRE UART I2C SPI 2WIRE 3WIRE KEYB LCD PIC DIO] Bootloader v4.5
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DEVID:0x0447 REVID:0x3046 (24FJ64GA00 2 B8)
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http://dangerousprototypes.com
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# Check voltages
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I2C>v
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Pinstates:
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1.(BR) 2.(RD) 3.(OR) 4.(YW) 5.(GN) 6.(BL) 7.(PU) 8.(GR) 9.(WT) 0.(Blk)
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GND 3.3V 5.0V ADC VPU AUX SCL SDA - -
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P P P I I I I I I I
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GND 3.27V 4.96V 0.00V 4.96V L H H L L
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#Notice how the VPU is in 5V becausethe EPROM needs 5V signals
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# Get mode options
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HiZ>m
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1. HiZ
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2. 1-WIRE
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3. UART
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4. I2C
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5. SPI
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6. 2WIRE
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7. 3WIRE
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8. KEYB
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9. LCD
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10. PIC
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11. DIO
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x. exit(without change)
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# Select I2C
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(1)>4
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I2C mode:
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1. Software
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2. Hardware
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# Select Software mode
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(1)>1
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Set speed:
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1. ~5kHz
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2. ~50kHz
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3. ~100kHz
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4. ~240kHz
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# Select communication spped
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(1)> 2
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Clutch disengaged!!!
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To finish setup, start up the power supplies with command 'W'
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Ready
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# Start communication
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I2C>W
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POWER SUPPLIES ON
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Clutch engaged!!!
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# Get macros
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I2C>(0)
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0.Macro menu
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1.7bit address search
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2.I2C sniffer
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#Get addresses of slaves connected
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I2C>(1)
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Searching I2C address space. Found devices at:
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0xA0(0x50 W) 0xA1(0x50 R)
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# Note that each slave will have a write address and a read address
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# 0xA0 ad 0xA1 in the previous case
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# Write "BBB" in address 0x69
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I2C>[0xA0 0x00 0x69 0x42 0x42 0x42]
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I2C START BIT
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WRITE: 0xA0 ACK
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WRITE: 0x00 ACK
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WRITE: 0x69 ACK
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WRITE: 0x42 ACK
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WRITE: 0x42 ACK
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WRITE: 0x42 ACK
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I2C STOP BIT
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# Prepare to read from address 0x69
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I2C>[0xA0 0x00 0x69]
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I2C START BIT
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WRITE: 0xA0 ACK
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WRITE: 0x00 ACK
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WRITE: 0x69 ACK
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I2C STOP BIT
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# Read 20B from address 0x69 configured before
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I2C>[0xA1 r:20]
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I2C START BIT
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WRITE: 0xA1 ACK
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READ: 0x42 ACK 0x42 ACK 0x42 ACK 0x20 ACK 0x48 ACK 0x69 ACK 0x20 ACK 0x44 ACK 0x72 ACK 0x65 ACK 0x67 ACK 0x21 ACK 0x20 ACK 0x41 ACK 0x41 ACK 0x41 ACK 0x00 ACK 0xFF ACK 0xFF ACK 0xFF
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NACK
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```
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### Sniffer
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U ovom scenariju ćemo prisluškivati I2C komunikaciju između arduino-a i prethodnog EPROM-a, samo treba da povežete oba uređaja i zatim povežete bus pirate na SCL, SDA i GND pinove:
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.png>)
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```bash
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I2C>m
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1. HiZ
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2. 1-WIRE
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3. UART
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4. I2C
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5. SPI
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6. 2WIRE
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7. 3WIRE
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8. KEYB
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9. LCD
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10. PIC
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11. DIO
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x. exit(without change)
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(1)>4
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I2C mode:
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1. Software
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2. Hardware
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(1)>1
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Set speed:
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1. ~5kHz
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2. ~50kHz
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3. ~100kHz
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4. ~240kHz
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(1)>1
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Clutch disengaged!!!
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To finish setup, start up the power supplies with command 'W'
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Ready
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# EVEN IF YOU ARE GOING TO SNIFF YOU NEED TO POWER ON!
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I2C>W
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POWER SUPPLIES ON
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Clutch engaged!!!
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# Start sniffing, you can see we sniffed a write command
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I2C>(2)
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Sniffer
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Any key to exit
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[0xA0+0x00+0x69+0x41+0x41+0x41+0x20+0x48+0x69+0x20+0x44+0x72+0x65+0x67+0x21+0x20+0x41+0x41+0x41+0x00+]
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```
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{{#include ../../banners/hacktricks-training.md}}
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