The link above is almost a crash course in how to use the wire library to interface with a sensor. Interfacing with a sensor to change register values or read registers with SPI. The last part is what i am struggling with. For example, make a library that can be used to control an MPU9250 using SPI commands to change registers. Is my googling just terrible?ĮDIT - My goal is learn the theory behind making a basic library for a sensor, not to make my own SPI library.
I've found lots of info on using SPI, but not configuring sensors etc with it in a nice, "SPI configuration for Dummies" type of thing. My question, is how do you read and write to registers in a similar way via SPI. Wire.write(0x3B) // starting with register 0x3B (ACCEL_XOUT_H) Wire.write(0) // set to zero (wakes up the MPU-6050)Īnd then access the registers like below Wire.beginTransmission(MPU_addr) For example below for I2C you could write Wire.begin() However i am trying to understand how to set registers using the SPI interface. I am now trying to use an MPU9250 for the sake of extra speed over SPI. Using the above blog, i learnt how to control an MPU6050 myself in a very basic sense. I do NOT think i am better than the people writing the libraries, just it's difficult to truly understand code/ a project with a downloaded library and it just stuffed at the top of a piece of butchered example code. With this, i was able to avoid using a library from Github.
The idea is sending data via CAN bus to a controlling MCU to then send to a raspberry pi to perform the calculations required for my MATLAB/ Simulink model.Īfter a lot of searching i found this great post/ blog on how to set I2C registers. Ok so as some readers might have seen, my current project involves using MPU's.
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