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# Bus Pirate To test a Bus Pirate is working, connect +5V with VPU and 3.3V with ADC and access the bus pirate (Using Tera Term for example) and use the command `~`: ```bash # Use command HiZ>~ Disconnect any devices Connect (Vpu to +5V) and (ADC to +3.3V) Space to continue # Press space Ctrl AUX OK MODE LED OK PULLUP H OK PULLUP L OK VREG OK ADC and supply 5V(4.96) OK VPU(4.96) OK 3.3V(3.26) OK ADC(3.27) OK Bus high MOSI OK CLK OK MISO OK CS OK Bus Hi-Z 0 MOSI OK CLK OK MISO OK CS OK Bus Hi-Z 1 MOSI OK CLK OK MISO OK CS OK MODE and VREG LEDs should be on! Any key to exit #Press space Found 0 errors. ``` As you can see in the previous command line it said that it found 0 errors. This is very useful to know it's working after buying it or after flashing a firmware. To connect with the bus pirate you can follow the docs: ![](<../../.gitbook/assets/image (307) (2).png>) In this case I'm going to connect to an EPROM: ATMEL901 24C256 PU27: ![](<../../.gitbook/assets/image (465) (2) (1).png>) To talk with bus pirate I used Tera Term connected to the pirate bus COM port with a Setup --> Serial Port --> Speed of 115200.\ In the following communication you can find how to prepare the bus pirate to talk I2C and how to write and read from the memory (Comments appear using "#", don't expect that part in the communication): ```bash # Check communication with buspirate i Bus Pirate v3.5 Community Firmware v7.1 - goo.gl/gCzQnW [HiZ 1-WIRE UART I2C SPI 2WIRE 3WIRE KEYB LCD PIC DIO] Bootloader v4.5 DEVID:0x0447 REVID:0x3046 (24FJ64GA00 2 B8) http://dangerousprototypes.com # Check voltages I2C>v Pinstates: 1.(BR) 2.(RD) 3.(OR) 4.(YW) 5.(GN) 6.(BL) 7.(PU) 8.(GR) 9.(WT) 0.(Blk) GND 3.3V 5.0V ADC VPU AUX SCL SDA - - P P P I I I I I I I GND 3.27V 4.96V 0.00V 4.96V L H H L L #Notice how the VPU is in 5V becausethe EPROM needs 5V signals # Get mode options HiZ>m 1. HiZ 2. 1-WIRE 3. UART 4. I2C 5. SPI 6. 2WIRE 7. 3WIRE 8. KEYB 9. LCD 10. PIC 11. DIO x. exit(without change) # Select I2C (1)>4 I2C mode: 1. Software 2. Hardware # Select Software mode (1)>1 Set speed: 1. ~5kHz 2. ~50kHz 3. ~100kHz 4. ~240kHz # Select communication spped (1)> 2 Clutch disengaged!!! To finish setup, start up the power supplies with command 'W' Ready # Start communication I2C>W POWER SUPPLIES ON Clutch engaged!!! # Get macros I2C>(0) 0.Macro menu 1.7bit address search 2.I2C sniffer #Get addresses of slaves connected I2C>(1) Searching I2C address space. Found devices at: 0xA0(0x50 W) 0xA1(0x50 R) # Note that each slave will have a write address and a read address # 0xA0 ad 0xA1 in the previous case # Write "BBB" in address 0x69 I2C>[0xA0 0x00 0x69 0x42 0x42 0x42] I2C START BIT WRITE: 0xA0 ACK WRITE: 0x00 ACK WRITE: 0x69 ACK WRITE: 0x42 ACK WRITE: 0x42 ACK WRITE: 0x42 ACK I2C STOP BIT # Prepare to read from address 0x69 I2C>[0xA0 0x00 0x69] I2C START BIT WRITE: 0xA0 ACK WRITE: 0x00 ACK WRITE: 0x69 ACK I2C STOP BIT # Read 20B from address 0x69 configured before I2C>[0xA1 r:20] I2C START BIT WRITE: 0xA1 ACK 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 NACK ``` ## Sniffer In this scenario we are going to sniff the I2C communication between the arduino and the previous EPROM, you just need to communicate both devices and then connect the bus pirate to the SCL, SDA and GND pins: ![](<../../.gitbook/assets/image (201) (2) (1).png>) ```bash I2C>m 1. HiZ 2. 1-WIRE 3. UART 4. I2C 5. SPI 6. 2WIRE 7. 3WIRE 8. KEYB 9. LCD 10. PIC 11. DIO x. exit(without change) (1)>4 I2C mode: 1. Software 2. Hardware (1)>1 Set speed: 1. ~5kHz 2. ~50kHz 3. ~100kHz 4. ~240kHz (1)>1 Clutch disengaged!!! To finish setup, start up the power supplies with command 'W' Ready # EVEN IF YOU ARE GOING TO SNIFF YOU NEED TO POWER ON! I2C>W POWER SUPPLIES ON Clutch engaged!!! # Start sniffing, you can see we sniffed a write command I2C>(2) Sniffer Any key to exit [0xA0+0x00+0x69+0x41+0x41+0x41+0x20+0x48+0x69+0x20+0x44+0x72+0x65+0x67+0x21+0x20+0x41+0x41+0x41+0x00+] ```
Support HackTricks and get benefits! - Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)! - Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family) - Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com) - **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.** - **Share your hacking tricks by submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**