“TIM Linux driver”的版本间的差异
第38行: | 第38行: | ||
=== Device tree === | === Device tree === | ||
− | + | 配置TIM Linux内核驱动程序时,请参阅[[TIM device tree configuration]] 文章。 | |
== How to use == | == How to use == |
2020年11月10日 (二) 10:36的版本
目录
Article purpose
本文介绍了用于TIM内部外围设备的TIM Linux® 驱动程序[1]:
- 驱动程序支持哪些TIM功能
- 如何配置,使用和调试驱动程序
- 驱动程序的结构是什么,以及在哪里可以找到源代码。
Short description
Linux驱动程序(内核空间)“ TIM” [1] 基于 PWM 和 IIO 框架。 它提供了几种功能:
MFD驱动程序:
- 处理寄存器,时钟和DMA[2]资源
- 检测TIM计数器分辨率,例如 16或32位。
PWM驱动器:
- 检测TIM通道数。
- 处理PWM输出通道。
- 处理PWM捕捉通道(输入)。 请注意,PWM捕获依赖于由MFD内核处理的DMA。
IIO 驱动程序:
Configuration
Kernel configuration
使用Linux Menuconfig工具在内核配置中激活TIM驱动程序[1]Menuconfig or how to configure kernel.
启用以下配置(及其依赖项)
- CONFIG_MFD_STM32_TIMERS
- CONFIG_PWM_STM32
- CONFIG_IIO_STM32_TIMER_TRIGGER
Device Drivers ---> -> Multifunction device drivers ---> <*> Support for STM32 Timers -> Pulse-width modulation (PWM) support ---> <*> STMicroelectronics STM32 PWM -> Industrial I/O support ---> -> Triggers - standalone ---> <*> STM32 timer trigger
Device tree
配置TIM Linux内核驱动程序时,请参阅TIM device tree configuration 文章。
How to use
How to use PWM with sysfs interface
How to set up a TIM or LPTIM trigger using the sysfs interface
How to trace and debug
The TIM[1] Linux driver can access the timer registers through REGMAP.
It comes with debugfs[7] entries, which allow dumping registers:
$ cd /sys/kernel/debug/regmap $ ls 40004000.timer 44000000.timer $ cd 44000000.timer $ cat registers 000: 00000081 004: 00000000 008: 00000000 00c: 00000000 ...
It also comes with tracepoints[8]:
$ cd /sys/kernel/debug/tracing $ cat available_events | grep regmap ... regmap:regmap_reg_read regmap:regmap_reg_write
Source code location
The TIM Linux driver source code is composed of:
- drivers/mfd/stm32-timers.c | |}} stm32-timers.c MFD driver to handle common resources: registers, clock, dmas.
- drivers/pwm/pwm-stm32.c | |}} pwm-stm32.c PWM driver to handle PWM channel(s).
- drivers/iio/trigger/stm32-timer-trigger.c | |}} stm32-timer-trigger.c IIO driver to handle trigger source for other internal peripherals and quadrature encoder interface.
- include/linux/mfd/stm32-timers.h| |}} include/linux/mfd/stm32-timers.h and include/linux/iio/timer/stm32-timer-trigger.h| |}} include/linux/iio/timer/stm32-timer-trigger.h header files
References
- ↑ 1.01.11.21.3 TIM internal peripheral
- ↑ DMA_internal_peripheral
- ↑ ADC internal peripheral
- ↑ DAC internal peripheral
- ↑ DFSDM internal peripheral
- ↑ Incremental encoder Incremental encoder overview
- ↑ 调试文件系统(debugfs)
- ↑ Ftrace
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