Improvements to LinearHall

[dekutree64]

• Added calibration for difference in the total range of each sensor from XieMaster's version, optimized to a single multiply.
• Added option for 60° and 120° sensor spacing.
• Added wait for first valid sensor readings in init, for some custom ADC setups.
• Changed private to protected and moved getSensorAngle there, better matching other sensor classes.
• Moved documentation from the header to a readme file.

Tested by o_lampe and myself.

[github-actions]

Memory usage change @ 6a4290f

Board	flash	%	RAM for global variables	%
adafruit:samd:adafruit_metro_m4	🔺 0 - +408	0.0 - +0.08	N/A	N/A
rp2040:rp2040:rpipico	🔺 0 - +408	0.0 - +0.02	🔺 0 - +8	0.0 - 0.0
arduino:sam:arduino_due_x	🔺 0 - +408	0.0 - +0.08	N/A	N/A
arduino:samd:nano_33_iot	🔺 0 - +408	0.0 - +0.16	🔺 0 - +8	0.0 - +0.02
esp32:esp32:esp32	🔺 +24 - +24	0.0 - 0.0	0 - 0	0.0 - 0.0
esp32:esp32:esp32s2	🔺 +24 - +444	0.0 - +0.03	🔺 0 - +8	0.0 - 0.0
STMicroelectronics:stm32:GenF1:pnum=BLUEPILL_F103C8	🔺 0 - +416	0.0 - +0.63	🔺 0 - +8	0.0 - +0.04
STMicroelectronics:stm32:Nucleo_64:pnum=NUCLEO_F411RE	🔺 0 - +400	0.0 - +0.08	🔺 0 - +8	0.0 - +0.01

Click for full report table

Board	examples/drivers/drv8316/drv8316_3pwm flash	%	examples/drivers/drv8316/drv8316_3pwm RAM for global variables	%	examples/drivers/drv8316/drv8316_6pwm flash	%	examples/drivers/drv8316/drv8316_6pwm RAM for global variables	%	examples/encoders/calibrated_sensor/calibration_save flash	%	examples/encoders/calibrated_sensor/calibration_save RAM for global variables	%	examples/encoders/linearhall flash	%	examples/encoders/linearhall RAM for global variables	%	examples/encoders/mt6816/mt6816_spi flash	%	examples/encoders/mt6816/mt6816_spi RAM for global variables	%	examples/encoders/calibrated_sensor/calibrated flash	%	examples/encoders/calibrated_sensor/calibrated RAM for global variables	%
adafruit:samd:adafruit_metro_m4	0	0.0	N/A	N/A	0	0.0	N/A	N/A	0	0.0	N/A	N/A	408	0.08	N/A	N/A	0	0.0	N/A	N/A
rp2040:rp2040:rpipico	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	408	0.02	8	0.0	0	0.0	0	0.0
arduino:sam:arduino_due_x	0	0.0	N/A	N/A	0	0.0	N/A	N/A	0	0.0	N/A	N/A	408	0.08	N/A	N/A	0	0.0	N/A	N/A
arduino:samd:nano_33_iot	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	408	0.16	8	0.02	0	0.0	0	0.0
esp32:esp32:esp32	24	0.0	0	0.0	24	0.0	0	0.0	24	0.0	0	0.0					24	0.0	0	0.0
esp32:esp32:esp32s2	24	0.0	0	0.0	24	0.0	0	0.0	24	0.0	0	0.0	444	0.03	8	0.0	24	0.0	0	0.0
STMicroelectronics:stm32:GenF1:pnum=BLUEPILL_F103C8	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	416	0.63	8	0.04
STMicroelectronics:stm32:Nucleo_64:pnum=NUCLEO_F411RE	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	400	0.08	8	0.01	0	0.0	0	0.0	0	0.0	0	0.0

Click for full report CSV

Board,examples/drivers/drv8316/drv8316_3pwm<br>flash,%,examples/drivers/drv8316/drv8316_3pwm<br>RAM for global variables,%,examples/drivers/drv8316/drv8316_6pwm<br>flash,%,examples/drivers/drv8316/drv8316_6pwm<br>RAM for global variables,%,examples/encoders/calibrated_sensor/calibration_save<br>flash,%,examples/encoders/calibrated_sensor/calibration_save<br>RAM for global variables,%,examples/encoders/linearhall<br>flash,%,examples/encoders/linearhall<br>RAM for global variables,%,examples/encoders/mt6816/mt6816_spi<br>flash,%,examples/encoders/mt6816/mt6816_spi<br>RAM for global variables,%,examples/encoders/calibrated_sensor/calibrated<br>flash,%,examples/encoders/calibrated_sensor/calibrated<br>RAM for global variables,%
adafruit:samd:adafruit_metro_m4,0,0.0,N/A,N/A,0,0.0,N/A,N/A,0,0.0,N/A,N/A,408,0.08,N/A,N/A,0,0.0,N/A,N/A
rp2040:rp2040:rpipico,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,408,0.02,8,0.0,0,0.0,0,0.0
arduino:sam:arduino_due_x,0,0.0,N/A,N/A,0,0.0,N/A,N/A,0,0.0,N/A,N/A,408,0.08,N/A,N/A,0,0.0,N/A,N/A
arduino:samd:nano_33_iot,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,408,0.16,8,0.02,0,0.0,0,0.0
esp32:esp32:esp32,24,0.0,0,0.0,24,0.0,0,0.0,24,0.0,0,0.0,,,,,24,0.0,0,0.0
esp32:esp32:esp32s2,24,0.0,0,0.0,24,0.0,0,0.0,24,0.0,0,0.0,444,0.03,8,0.0,24,0.0,0,0.0
STMicroelectronics:stm32:GenF1:pnum=BLUEPILL_F103C8,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,416,0.63,8,0.04,,,,
STMicroelectronics:stm32:Nucleo_64:pnum=NUCLEO_F411RE,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,400,0.08,8,0.01,0,0.0,0,0.0,0,0.0,0,0.0