I2C

最后更新于11个月前

I2C

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总线海盗

要测试总线海盗是否工作，请将+5V连接到VPU，将3.3V连接到ADC，然后访问总线海盗（例如使用Tera Term），并使用命令~：

# 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.

正如您在前面的命令行中看到的，它显示找到了0个错误。在购买设备或刷写固件后，了解设备是否正常工作非常有用。

要连接到总线海盗，您可以按照文档操作：

在这种情况下，我将连接到一个EPROM：ATMEL901 24C256 PU27：

要与总线海盗通信，我使用了Tera Term连接到海盗总线的COM端口，设置为串行端口速度为115200。在以下通信中，您可以找到如何准备总线海盗进行I2C通信以及如何从存储器中写入和读取数据（注释使用“#”表示，通信中不包含这部分内容）:

# 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

在这种情况下，我们将嗅探Arduino和之前的EPROM之间的I2C通信，您只需要连接这两个设备，然后将总线海盗连接到SCL、SDA和GND引脚：

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+]

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最后更新于11个月前