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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。
以上来自于百度翻译 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. |
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2个回答
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你没有提到树莓和EVE板之间的接地,如果你使用单独的电源板,就不要依赖电源连接。
以上来自于百度翻译 以下为原文 You don't mention a ground connection between the Raspberry and the Eval board. Do NOT rely on the power supply connection to do it if you're using separate supplies for each board. |
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HQ Q B,即使当连接TP2/TP1到树莓的+5V和GND(没有单独的供应)时,它也不起作用。我也尝试用+3v3来给卡,它也不起作用。用万用表,我看到MC23017是供电的。Raspberry B +V1.2的I2C总线需要额外的上拉电阻?
以上来自于百度翻译 以下为原文 Hi qɥb, Even when connecting TP2/TP1 to the +5V and GND of the Raspberry (no separate supplies), it does not work. I also try to feed the card with +3V3, it does not work either. With the multimeter, I see that the MCP23017 is powered. The I2C bus of the Raspberry B+ V1.2 requires additional pull-up resistors? |
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