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UM0324 데이터시트(PDF) 75 Page - STMicroelectronics

부품명 UM0324
상세설명  This user manual describes
PDF  105 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0324 데이터시트(HTML) 75 Page - STMicroelectronics

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UM0324
Library functions
75/105
ENC_Get_Average_Speed
TIMx_UP_IRQHandler
- interrupt routine
Synopsis
s16 ENC_Get_Average_Speed(void)
Description
This function returns the average rotor speed in Hz.The value
returned is given with 0.1Hz resolution, which means that 1234 is
equal to 123.4 Hz.
Input
None
Output
Signed 16 bits
Functions called
ENC_Get_Speed()
Note
The averaging is done with the values stored in ‘Speed_Buffer[]’. The
size of this buffer is set through the ‘SPEED_BUFFER_SIZE’
statement, which must be equal to a power of 2 to allow the use of
the shift operation for divisions.
This routine returns the mechanical frequency of the rotor. To find the
electrical speed, use the following conversion:
electrical frequency = mechanical frequency * number of pole pairs
Synopsis
void TIMx_UP_IRQHandler(void)
Description
This is the encoder timer (TIMER 0, 1 or 2) update routine. An
interruption is generated whenever an overflow/underflow of the
counter value occurs (TIM_CNT). The ‘Encoder_Timer_Overflow’
variable is then incremented.
Functions called
None
Note
This is an interrupt routine.
See also
STR750 Datasheet: Synchronizable Standard Timer.



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