STM32 - Githubissues

SCUBAJET commented 5 years ago

Hello,

our project is based on STM32 Plattform. Is the Tlv493d Library also available for STM32? We get compiling errors for STM32. it is working fine with a ATMEGA328 chip.

Regards, Armin

mhollfelder commented 5 years ago

Hi Armin,

Thank you very much for your report - I just jump in to help out here and support my colleagues.

To proceed we need some more information and details: Could you provide us some more information and what the exact error is, e.g. is it not compiling at all or do you just see no output? Do you use the Arduino platform on the respective MCU or some generic platform? We would need some more background to help you out here.

Please keep in mind that we only support the Arduino platform in this repository, i.e. if you run Arduino on the respective controller we can help with the Arduino library for the TLV493D, but we cannot give support if the problem comes from the underlying implementation of Arduino for your respective platform. Additionally, for other systems, this library would need to be ported and changed accordingly.

Thank you very much and best regards,

Manuel

SCUBAJET commented 5 years ago

Hi Manuel,

thank you for the quick reply. Yes we use the Arduino platform on the MCU. thats the error we get:

Build options changed, rebuilding all
/Users/ak/Documents/Arduino/libraries/TLV493D-A1B6-3DMagnetic-Sensor-master/src/Tlv493d.cpp: In member function 'void Tlv493d::resetSensor(uint8_t)':
/Users/ak/Documents/Arduino/libraries/TLV493D-A1B6-3DMagnetic-Sensor-master/src/Tlv493d.cpp:287:29: error: call of overloaded 'write(int)' is ambiguous
   mInterface.bus->write(0x00);
                             ^
In file included from /Users/ak/Documents/Arduino/libraries/TLV493D-A1B6-3DMagnetic-Sensor-master/src/Tlv493d.h:38:0,
                 from /Users/ak/Documents/Arduino/libraries/TLV493D-A1B6-3DMagnetic-Sensor-master/src/Tlv493d.cpp:34:
/Users/ak/Library/Arduino15/packages/adafruit/hardware/nrf52/0.9.3/libraries/Wire/Wire.h:56:12: note: candidate: virtual size_t TwoWire::write(uint8_t)
     size_t write(uint8_t data);
            ^
In file included from /Users/ak/Library/Arduino15/packages/adafruit/hardware/nrf52/0.9.3/cores/nRF5/Stream.h:26:0,
                 from /Users/ak/Library/Arduino15/packages/adafruit/hardware/nrf52/0.9.3/cores/nRF5/HardwareSerial.h:24,
                 from /Users/ak/Library/Arduino15/packages/adafruit/hardware/nrf52/0.9.3/cores/nRF5/Arduino.h:56,
                 from /Users/ak/Documents/Arduino/libraries/TLV493D-A1B6-3DMagnetic-Sensor-master/src/Tlv493d.h:37,
                 from /Users/ak/Documents/Arduino/libraries/TLV493D-A1B6-3DMagnetic-Sensor-master/src/Tlv493d.cpp:34:
/Users/ak/Library/Arduino15/packages/adafruit/hardware/nrf52/0.9.3/cores/nRF5/Print.h:50:12: note: candidate: size_t Print::write(const char*)
     size_t write(const char *str) {
            ^
exit status 1

mhollfelder commented 5 years ago

Hi Armin,

I just edited your comment to format it as a code block with console output. Helps me to digest the information in an easier way ;)

You should be able to resolve the issue by changing the following line 287 in:

/Users/ak/Documents/Arduino/libraries/TLV493D-A1B6-3DMagnetic-Sensor-master/src/Tlv493d.cpp

Change it from mInterface.bus->write(0x00); to mInterface.bus->write((uint8_t)0x00);

The problem is that the write function is overloaded and the compiler cannot resolve the correct function, per my understanding. Here, we introduce a typecast (uint8_t)0x00 to explicitly tell the compiler which function should be called.

I could not test it, but it should work - please let me know whether you face problems.

Best regards,

Manuel

SCUBAJET commented 5 years ago

Hi Manuel,

Thank you for the hint! It works now ;) one quick question, what could be the reason for the instability of the Sensor values? Amount = 0.17 mT; Azimuth angle (rad) = 0.79 ; Polar angle (rad) = -0.62 Amount = 0.31 mT; Azimuth angle (rad) = 0.32 ; Polar angle (rad) = 0.00 Amount = 0.22 mT; Azimuth angle (rad) = 0.00 ; Polar angle (rad) = -0.46 Amount = 0.10 mT; Azimuth angle (rad) = 1.57 ; Polar angle (rad) = 0.00 Amount = 0.24 mT; Azimuth angle (rad) = 1.11 ; Polar angle (rad) = -0.42 Amount = 0.22 mT; Azimuth angle (rad) = -0.46 ; Polar angle (rad) = 0.00 Amount = 0.33 mT; Azimuth angle (rad) = 0.32 ; Polar angle (rad) = -0.31 Amount = 0.24 mT; Azimuth angle (rad) = 0.46 ; Polar angle (rad) = -0.42 Amount = 0.29 mT; Azimuth angle (rad) = 1.11 ; Polar angle (rad) = -0.73 Amount = 0.17 mT; Azimuth angle (rad) = 0.79 ; Polar angle (rad) = -0.62 Amount = 0.37 mT; Azimuth angle (rad) = 0.59 ; Polar angle (rad) = -0.27 Amount = 0.37 mT; Azimuth angle (rad) = 0.59 ; Polar angle (rad) = -0.27 Amount = 0.33 mT; Azimuth angle (rad) = 0.32 ; Polar angle (rad) = -0.31 Amount = 0.22 mT; Azimuth angle (rad) = 0.46 ; Polar angle (rad) = 0.00 Amount = 0.29 mT; Azimuth angle (rad) = 0.79 ; Polar angle (rad) = -0.34 Amount = 0.17 mT; Azimuth angle (rad) = 0.79 ; Polar angle (rad) = -0.62

The Magnet are not moved between the first and last line of Serial output.

BG, Armin

tpitman commented 5 years ago

As a user I can tell you this is just because it is so sensitive. You will find that the best solution is the average the values.

On Fri, Mar 29, 2019 at 8:17 AM Armin notifications@github.com wrote:

Hi Manuel,

Thank you for the hint! It works now ;) one quick question, what could be the reason for the instability of the Sensor values? Amount = 0.17 mT; Azimuth angle (rad) = 0.79 ; Polar angle (rad) = -0.62 Amount = 0.31 mT; Azimuth angle (rad) = 0.32 ; Polar angle (rad) = 0.00 Amount = 0.22 mT; Azimuth angle (rad) = 0.00 ; Polar angle (rad) = -0.46 Amount = 0.10 mT; Azimuth angle (rad) = 1.57 ; Polar angle (rad) = 0.00 Amount = 0.24 mT; Azimuth angle (rad) = 1.11 ; Polar angle (rad) = -0.42 Amount = 0.22 mT; Azimuth angle (rad) = -0.46 ; Polar angle (rad) = 0.00 Amount = 0.33 mT; Azimuth angle (rad) = 0.32 ; Polar angle (rad) = -0.31 Amount = 0.24 mT; Azimuth angle (rad) = 0.46 ; Polar angle (rad) = -0.42 Amount = 0.29 mT; Azimuth angle (rad) = 1.11 ; Polar angle (rad) = -0.73 Amount = 0.17 mT; Azimuth angle (rad) = 0.79 ; Polar angle (rad) = -0.62 Amount = 0.37 mT; Azimuth angle (rad) = 0.59 ; Polar angle (rad) = -0.27 Amount = 0.37 mT; Azimuth angle (rad) = 0.59 ; Polar angle (rad) = -0.27 Amount = 0.33 mT; Azimuth angle (rad) = 0.32 ; Polar angle (rad) = -0.31 Amount = 0.22 mT; Azimuth angle (rad) = 0.46 ; Polar angle (rad) = 0.00 Amount = 0.29 mT; Azimuth angle (rad) = 0.79 ; Polar angle (rad) = -0.34 Amount = 0.17 mT; Azimuth angle (rad) = 0.79 ; Polar angle (rad) = -0.62

The Magnet are not moved between the first and last line of Serial output.

BG, Armin

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mhollfelder commented 5 years ago

Hi Armin,

It's easy to understand if you keep in mind how the principles of error stochastics work and what is the typical error of the sensor.

If you take a look at the datasheet, you will find on page 17 the resolution (assuming 12 Bit accuracy):

Resolution 12-bit readout: 0.98 – mT/LSB (98 µT/LSB)

The Amount is calculated via:

As you see from the formula, without going into details, the error of every axis would sum up for the magnitude of the magnetic field, i.e. the 0.1 mT would sum up and the fluctuations can be easily explained. If you are interested, you would need to search for propagation of errors and you should find some more information - formulas get quite fast quite unhandy ;)

Best regards,

Manuel

bilalahmad333 commented 5 years ago

Hello, I have some question in continuation to this thread. I am getting some measurement as well but they are quite random e.g my raw measurement i.e. converting data to signed 12 bit integer values are as follows

Bx = 0, By = 0 Bz = -1 temp = 342 Bx = 0, By = 1 Bz = 0 temp = 341 Bx = -2, By = 0 Bz = 1 temp = 342 Bx = 0, By = -1 Bz = 1 temp = 342 Bx = -1, By = -1 Bz = 0 temp = 342 Bx = 0, By = 1 Bz = 0 temp = 341 Bx = 1, By = 1 Bz = 1 temp = 343 Bx = -1, By = 2 Bz = 0 temp = 341 Bx = -1, By = -1 Bz = 0 temp = 342 Bx = -2, By = 1 Bz = 0 temp = 341 Bx = 2, By = 1 Bz = 0 temp = 342 Bx = 0, By = 0 Bz = 1 temp = 342 Bx = 0, By = -1 Bz = 0 temp = 341 Bx = 0, By = 1 Bz = 0 temp = 342 Bx = -1, By = 0 Bz = 0 temp = 342 Bx = 2, By = 1 Bz = 0 temp = 342 Bx = -2, By = 1 Bz = 0 temp = 341 Bx = -1, By = 0 Bz = 0 temp = 341 Bx = 0, By = 1 Bz = 0 temp = 341 Bx = 3, By = 0 Bz = 0 temp = 342 Bx = 1, By = 0 Bz = -1 temp = 342 Bx = 2, By = -1 Bz = 1 temp = 342

Now I am not sure whether I am reading the measurement wrong or these are the values expected from sensor. I am not touching the sensor and it is lying on the table. Additionally, I am using Nordic NRF52 controller, sensor TLV393D-A1B6 and I using the driver given on infineon official website.

@mhollfelder @tpitman