If (myValue & (1 << bitNumber)) // shift a single bit and mask all others outįor your longer returns you might want to write another more flexible fn that reads a given number of bytes into a byte array - if you happen to have several 4byte returns a version that returns a uint32_t might me useful, too. When you want to test the single bits of any number you do something like this uint16_t myValue So when you get a HEX return, you can treat it just like any other number, meaning for your 2 byte HEX you can just use the read16u(). If you are using Windows (others will have too, I guess) you have the Calc.EXE which provides you with a Programmers-View and does show you all different number representations for free -). DEC 12 = HEX 0C = BIN 00001100 - there is even OCTal 14 ).Īnd C provides an easy way to write number literals of different bases (HEX 0x0C, BIN 0b00001100 and OCT 014 - beware of this when writing DEC literals with leading zeros (!)). I’ve learned a lot about i2c communication over the last few days and I find it fascinating how it works and works so quickly.Īny help or advice is greatly as I’m not sure how adept you are with C, you have to excuse, if I’m too basic for some or too much into detail for other things.įirst of, HEX is just a different way of writing numbers compared to DEC or BIN (e.g. I’m sure its simple but beyond me at the moment. I’m thinking I need to take the returned “registerValue” and convert the HEX to a string of 1’s and 0’s? I’m not sure what I should change in my current unsigned int wire request code that is working fine for other registers that are not returning data in HEX format. The next register returns the same Hex data type but instead of 2 Bytes it returns 4 + 1 Bytes. The 0 or 1 status of those bits will tell me whats up based on this graph:
Now I’m thinking that I need to convert that HEX value to string of 16 individual bits. Now I want to read from this register that returns a 2 Byte Hex value held in a unsigned Int data format. Those work fine for pulling data from registers that only hold and return 1 or 2 Bytes of signed & unsigned int data. Wire.requestFrom(BQ20Z45_Address,2,true) Wire.requestFrom(BQ20Z45_Address,1,true) My current sketch is using the following 3 functions to read registers over the Wire library on a Arduino Micro and its working perfectly.I’ll try to be as clear as I can, so lets start off with the first task I need help with. I have a working library that is successfully communicating with the battery management chip over i2c and I’m pulling most of the info I need but there are more registers I need help with accessing. I’m needing some help understanding how to communicate with a battery management system via i2c.
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