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UM0851 bảng dữ liệu(PDF) 217 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  SPEAr is a family of highly customizable ARM-based embedded
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UM0851
Miscellaneous device drivers
Doc ID 16604 Rev 2
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Figure 62.
Duty and Period
9.3.2
Software overview
The PWM driver provides a direct interface to other Linux drivers. The PWM driver can be
found at arch/arm/mach-spear300/spr_pwm_st.c. Based upon input from user drivers the
PWM is programmed by the PWM driver.
Figure 63.
PWM driver architecture
9.3.3
PWM usage in Linux
The PWM can be used from the kernel level only. User drivers must include
include/linux/pwm.h file to access functions exported from the PWM driver. There are four
channels in the PWM hardware. There numbers are 0, 1, 2 & 3. To use the PWM channels,
follow the steps described below:
Request
The user driver must request the PWM channel it wants to use. This is done using the
following function call.
/* Pwm_id: is pwm channel id, can be 0, 1, 2 or 3.
Counter clock after prescaler
Duty
Period
Kernel space
Hardware
User drivers
PWM driver
ST PWM



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