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About Digisolve
since
07-16-2021
12-14-2022
Digisolve
Established Member
50
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Solution
05-23-2022
11:27 AM
I too am using the BNO055 & wanting to reuse the calbration data. When calibrating & reusing the calibration data which of the following register sets needs to be saved & restored on a POR? SIC registers: page 0 0x43 thru 0x54 OFFSET registers: page 0 0x55 thru 0x66 RADUIS registers: page 0 0x67 thru 0x6A It’s not clear in the datasheet BST-BNO055-DS000-18 rev 1.8 & not mentioned in apps note BST-BNO044-AN007 version 1.0
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05-21-2022
07:50 PM
I am developing a consumer product which we will sell in different parts of the world. You say the SIC can be calibrasted in the lab & these values can be used in all locations. Have I got that correct? Please can you advise how this is done. Also you say for calibration for North, this needs to be done in the location used. Please can you advise how this can be done so a consumer can carry this procedure out.
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05-21-2022
07:34 PM
I have the BNO055 mounted on my own board & I've found one of them is faulty. Using my 2nd board & get better results. But I have to slow my I2C bus down. It' quite slow now as I'm only bit banging it with an 8-bit CPU using the GPIO pins. I also only noticed the 600mS POR delay!! so I'm now up & running 🙂 One other thing I found. When selecting the external crystal & found I needed to wait a period of time (I'm waiting 10mS) before checking the clock stats bit otherwise I get a false positive & then reading the system trigger reg reports the external crysal is not test // use external clock //
BNO055_I2C_Write(BNO055_SYS_TRIGGER_ADDR, 0x80);
Delay(TICK_10MS); // required to avoid false +ve in CLK_STAT
while(BNO055_I2C_Read(BNO055_SYS_CLK_STAT_ADDR) & 1)
{
Delay(TICK_10MS);
}
if((BNO055_I2C_Read(BNO055_SYS_TRIGGER_ADDR) & 0x80) == 0)
while(1); // !!! EXTERNAL CLOCK SELECTION FAILED
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05-17-2022
01:57 PM
Thank you for your update. I am using a logic analyser & I can see the ID respsonses The ID's are read one after the other in the other shown in my post. The first 2 are ok & the last 3 are ok. It's just the MAG & GYRO that are worng (both read 0x00). Could this be a POR issue on my unit where the MAG & GYRO engines are not resetting correctly. Also when I read the ST_RESULT (0x36) register I get 0x09 instead of 0x0F again implying the MAG & GYRO are not working correctly Could these units have different code programmed with only the Acceleromoter enabled?
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05-13-2022
07:46 PM
I'm just starting to use the BNO055 & setting up the I2C I found that my ID's do not all match the data sheet 0 CHIP_ID = 0xA0. This matches the data sheet ACC_ID = 0xFB. This matches the data sheet MAG_ID = 0x00. This does NOT match the data sheet value of 0x32 GYP_ID = 0x00. This does NOT match the data sheet value of 0x0F SW_REV_ID_LSB = 0x11. This matches the data sheet SW_REV_ID_LSB = 0x03. This matches the data sheet SW_REV_ID_LSB = 0x15. This matches the data sheet These are read out in this order so I don't beleive it's an I2C comms issue
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