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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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Om te toets of 'n Bus Pirate werk, koppel +5V met VPU en 3.3V met ADC en toegang die bus pirate (gebruik Tera Term byvoorbeeld) en gebruik die opdrag `~`:
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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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Soos jy in die vorige opdraglyn kan sien, het dit gesê dat dit 0 foute gevind het. Dit is baie nuttig om te weet dit werk na aankoop of na die flits van 'n firmware.
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Om met die bus pirate te verbind, kan jy die dokumentasie volg:
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.png>)
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In hierdie geval gaan ek met 'n EPROM verbind: ATMEL901 24C256 PU27:
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.png>)
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Om met die bus pirate te praat, het ek Tera Term gebruik wat aan die pirate bus COM-poort gekoppel is met 'n Setup --> Serial Port --> Speed van 115200.\
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In die volgende kommunikasie kan jy vind hoe om die bus pirate voor te berei om I2C te praat en hoe om van die geheue te skryf en te lees (Kommentaar verskyn met "#", verwag nie daardie deel in die kommunikasie nie):
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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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In hierdie scenario gaan ons die I2C kommunikasie tussen die arduino en die vorige EPROM snuffel, jy moet net albei toestelle kommunikeer en dan die bus pirate aan die SCL, SDA en GND panele koppel:
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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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