Lesson11 (mpu6050) scripts: Eugene.Ovdiyuk #118
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ovdiyuk
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Jan 7, 2019
ovdiyuk
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- Implemented get_temperature.sh shell script which prints value of temperature (TEMP_OUT_H, TEMP_OUT_L) once per second using i2cget in infinite loop. Value converted to F and C. Upload the script into to folder ‘mpu6050_scripts’.
- Added ins_mod.sh and rm_mod.sh for fast Module load
- Fixed errors in driver mpu6050.c from the repository.
- Makefile was modified to build module on OrangePI
- Implemented GUI script gui_mpu6050.sh to pull mpu6050 module data in the terminal
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Updated Makefile to build on OrangePI Updated C file: corrected errors
insmod and rmmod scripts are added gui_mpu6050.sh script added for pulling information in console
implemented get_temperature.sh to get Temp via i2c-tool
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| LB=$(sudo i2cget -y 0 0x68 0x42) | ||
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| #Upper Bit + Lower Bit | ||
| TEMP=$(( (UB<<8)+LB-65535 )) |
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Is it require to use -65535?
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Yes, this is the only way to XOR all 16 bits. I don't know why, but ^0xFFFF works incorrectly in the bash.
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Why do You need XOR for all bits?
| TEMP=$(( (UB<<8)+LB-65535 )) | ||
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| # Calc C value | ||
| TEMP_C=$(bc << EOF |
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Is it possible to use bash operators using (( )) instead of calling bc.
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this is not possible, because bash cannot work with decimal variables. Of cause, we can use 10^3 multiplicator and convert variable on UI. But I choose this solution.
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| #Read data | ||
| UB=$(sudo i2cget -y 0 0x68 0x41) | ||
| LB=$(sudo i2cget -y 0 0x68 0x42) |
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Is it possible to read high and low part of data in single command using i2cget option '-w' ?
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Yes, "sudo i2cget -y 0 0x68 0x41 w" works. I didn't know about this. Thanks a lot
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But then I need to swap Lo and Hi bytes. Not sure in a method for bash.
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Like this: UB=$(sudo i2cget -y 0 0x68 0x41) && LB=$(sudo i2cget -y 0 0x68 0x42) && UBLB=$(sudo i2cget -y 0 0x68 0x41 w) && echo $UB $LB $UBLB
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I suppose command 'sudo i2cget -y 0 0x68 0x41 w' will give You UBLB as result. Is it correct?
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