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MAX31889EVSYS and MAX32630FTHR RoadTest Review Part 1

raspberrypitechguy

I am already done with the main part of the roadtest, at least what I was able to do, this is a series of blog posts to complement the RoadTest and to work the features of the Feather, the MAX32630FTHR.

 

This blog post is to test the BMI160 onboard the device.

 

TRIAL: BMI160.

 

I don't know who wrote the Mbed library. The printf function cannot print out integers and floats. Have yet to try with longs and doubles, but I'm assuming not.

 

Initially, the sample code provided "%f" for all values of the gyro/accelerometer.

 

Revising the code to this:

 

oss << "ACC xAxis = " << std::to_string(accData.xAxis.raw) << " : " << my_to_string(accData.xAxis.scaled) << static_cast<double>(accData.xAxis.scaled) << "\n\r"

        << "ACC yAxis = " << std::to_string(accData.yAxis.raw) << " : " <<  my_to_string(accData.yAxis.scaled) << "\n\r"
        << "ACC zAxis = " << std::to_string(accData.zAxis.raw) << " : " << my_to_string(accData.zAxis.scaled) << "\n\r"
        << "GYRO xAxis = " << std::to_string(gyroData.zAxis.raw) << " : " << my_to_string(gyroData.xAxis.scaled) << "\n\r"
        << "GYRO yAxis = " << std::to_string(gyroData.zAxis.raw) << " : " << my_to_string(gyroData.yAxis.scaled) << "\n\r"
        << "GYRO zAxis = " << std::to_string(gyroData.zAxis.raw) << " : " << my_to_string(gyroData.zAxis.scaled) << "\n\r"
        << "Sensor Time = " << std::to_string(sensorTime.seconds) << "\n\r"
        << "Sensor Temp = " << std::to_string(imuTemperature) << "\n\r";
        pc.write((void*)oss.str().c_str(), oss.str().size() + 1);
        wait_us(100000);

(of course, with the proper libraries and declarations...)

 

This yielded,

GYRO zAxis = 48 : 292

Sensor Time = %f

Sensor Temp = %f

ACC xAxis = -2127 : -25

ACC yAxis = 1961 : 23

ACC zAxis = 8714 : 106

GYRO xAxis = -13 : 134

GYRO yAxis = -13 : -103

GYRO zAxis = -13 : -79

Sensor Time = %f

Sensor Temp = %f

ACC xAxis = -1632 : -19

ACC yAxis = 480 : 5

ACC zAxis = 8369 : 102

GYRO xAxis = -22 : -103

GYRO yAxis = -22 : 329

GYRO zAxis = -22 : -134

Sensor Time = %f

Sensor Temp = %f

ACC xAxis = -1008 : -12

ACC yAxis = -576 : -7

ACC zAxis = 8895 : 108

GYRO xAxis = -102 : -987

GYRO yAxis = -102 : 1780

GYRO zAxis = -102 : -621

Sensor Time = %f

Sensor Temp = %f

ACC xAxis = -2777 : -33

ACC yAxis = 1201 : 14

ACC zAxis = 9648 : 117

GYRO xAxis = 758 : -3158

GYRO yAxis = 758 : -725

GYRO zAxis = 758 : 4621

Sensor Time = %f

Sensor Temp

 

(sorry, can't figure out how to add the code things)

 

At least we have numbers. This was a sample after shaking the board a bit.

 

As you can see, time and temp are not printed correctly.

 

Does the gyro work? Yes. Does the accelerometer work? Yes. Does it work out of the box with the code actually working? No.

 

At least... it works... that's a plus... right?

 

Will be experimenting with BLE soon... need to figure out swift.

 

The wait_ms doesn't work. Needed to use wait_us instead after including the correct library.

 

 

The libraries weren't written the best, and some changes were needed. Perhaps at the time of writing, 3 years ago, it was still correct, but it's Mbed OS 6 now, which is far different than the Mbed OS 2 it was written for.