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About cwi
since
10-22-2020
09-09-2022
cwi
Established Member
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Solution
11-23-2020
12:52 PM
As far as I've understood the trim values need to be read from the BMX160 via the mag_if registers. Following the datasheet: For a read access:
Write magnetometer register address to read from into Register (0x4D) MAG_IF[1]
Read
Register (0x1B) STATUS
until the bit mag_man_op is “0”
Read Register (0x04-0x0B) DATA_0 to DATA_7, get the data from magnetometer
1. First setting the Powermode: 0x19 -> BMX160_COMMAND_REG_ADDR 2. Set setup mode with burst read 8 bytes: 0x83 -> BMX160_MAG_IF_0_ADDR 3. Write Regaddres too MAG_IF1: BMM150_DIG_Z4_LSB -> BMX160_MAG_IF_1_ADDR wait 10 ms 4. Read Status byte and check bit man_mag_op is "0" 5. Read Register (0x04-0x0B) DATA_0 to DATA_7, get the data from magnetometer But I am always getting zeros and not data. Help is apreciated. Best regrads, Constantin
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11-19-2020
05:52 PM
Hi, I am reading the temperature measurement from the BMX160 sensor and I am getting strange values int16_t temp = (int16_t) ((m_temp_buffer[1] << 😎 | m_temp_buffer[0]); The output is varying a lot beween 10 .. 25 °C in just a few minutes why it is always at the same position inside a room at 23°.
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- bmx160 temperature
11-19-2020
12:10 PM
And as I mentioned this is quiet unsatisfying, but okay I cannot change it.
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11-19-2020
12:07 PM
Hi, This might be the case but your drivers are not suitable for DMA triggered reading and writing .Therefore, I need to implement the driver for myself.Polling the SPI is far to slow. And it would be good to tell the user that there are trim values. In the entire datasheet of the BMX160 it is not mentioned. Nor the compensation is explained. Is there a specific reason for it? Further, I am only guessing that I need to read the trim values via mag_if[2] and mag_if[3]. But is bulk read possible? Or do I need to pick up each trim value manually? Kind regards, Constantin
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11-18-2020
08:10 PM
Okay but I cannot find something in the Datasheet there I can only configure Could you tell me the page where I have to look. Because I've searched it already in detail. Furthermore, the link you mentioned does not even know the word temperature nor the source code. So could you tell me where I should find it? Kind regards, Constantin
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