在MCP23X17评估板上使用MCP23017，具有I2C板外功能

嗨，我最近买了MCP23 x17评估板，用我的树莓PI模型B+V1.2测试I2C接口。首先，我检查了评估板是操作性的：没有问题（在TP2上提供5V，TP1上的GND，所有BP执行默认代码来打开/关闭LED）。其次，我想测试我的i2C接口与我的树莓：在VDD（TP2）的电源与电源（JP-1）的J35-1（MCLR）上GND（关闭PIC）-A0，A1，A2在GND上的地址0x20-SCL（树莓）J4-2（SCK）-SDA（树莓）J4-3（树莓）当我执行“i2cDebug -Y 1”通过树莓，I2C设备不是被发现了，那我该怎么办？提前感谢。



      以下为原文

    Hi,

I bought recently MCP23X17 Evaluation Board for test I2C interface with my Raspberry Pi Model B+ V1.2.
First, I started by checking that the evaluation board was operationnal : no issues (supply 5V on TP2, GND on TP1, all BP execute the default code to turn on/off the LEDs).

Secondly, I wanted to test my I2C interface with my Raspberry :
- 5V Supply on VDD (TP2) with EX355 Power Supply
- J1-1 (MCLR) on GND (to turn off the PIC)
- A0, A1, A2 on GND for Address 0x20
- SCL (Raspberry) on J4-2 (SCK)
- SDA (Raspberry) on J4-3 (MDSA)

When I execute "i2cdetect -y 1" via Raspberry, the I2C device is not getting detected.
What should I do then ?

Thanks in advance.