RT-Thread-MilkV Duo RT-Thread HWtimer 对接RT-Thread问答社区

MilkV Duo RT-Thread HWtimer 对接

发布于 2024-07-01 00:00:43 浏览：289 订阅该版

参考官方[datasheet](https://github.com/milkv-duo/duo-files/blob/main/duo/datasheet/CV1800B-CV1801B-Preliminary-Datasheet-full-en.pdf)

针对 RT-Thread 设备驱动，需要对接以下方法

```c
static const struct rt_hwtimer_ops _hwtimer_ops = {
    .init = _hwtimer_init,
    .start = _hwtimer_start,
    .stop = _hwtimer_stop,
    .count_get = _hwtimer_count_get,
    .control = _hwtimer_control
};
```

基于操作寄存器的 hwtimer 驱动来自于 [sophgo/cvi_alios_open ](https://github.com/sophgo/cvi_alios_open)

本文主要记录一些需要注意的细节：

- datasheet 中指明：系统 Timer 可选 25MHz /32KHz 计数时钟。使用 reg_timer_clk_sel 做选择。因此驱动中只有两个定时器频率可选，当前默认使用 25MHz

- 大小核中断号不一致，当前官方[datasheet](https://github.com/milkv-duo/duo-files/blob/main/duo/datasheet/CV1800B-CV1801B-Preliminary-Datasheet-full-en.pdf)中的中断表为大核中断号，小核中断号在[ Milk-V Duo Official buildroot SDK ](https://github.com/milkv-duo/duo-buildroot-sdk)文件中查看：duo-buildroot-sdk/freertos/cvitek/hal/cv180x/config/intr_conf.h

- 由于小核只有Timer4~7有对应的中断号，因此只对接了Timer4~7的设备驱动，大核具备Timer0~7完整的中断号，因此小核 board/Kconfig 文件添加如下：

```
  menuconfig BSP_USING_HWTIMER
          bool "Enable HWTIMER"
          default n
          select RT_USING_HWTIMER
          if BSP_USING_HWTIMER
              config BSP_USING_TIMER4
                  bool "Enable HWTIMER4"
                  default n
  
              config BSP_USING_TIMER5
                  bool "Enable HWTIMER5"
                  default n
  
              config BSP_USING_TIMER6
                  bool "Enable HWTIMER6"
                  default n
  
              config BSP_USING_TIMER7
                  bool "Enable HWTIMER7"
                  default n
  
              if SOC_TYPE_CV180X
                  config TIMER_IRQ_BASE
                      int
                      default 51
              endif
  
              if SOC_TYPE_SG2002
                  config TIMER_IRQ_BASE
                      int
                      default 55
              endif
          endif
  ```

大核  board/Kconfig 文件添加如下：

```
  menuconfig BSP_USING_HWTIMER
          bool "Enable HWTIMER"
          default n
          select RT_USING_HWTIMER
          if BSP_USING_HWTIMER
              config BSP_USING_TIMER0
                  bool "Enable HWTIMER0"
                  default n
  
              config BSP_USING_TIMER1
                  bool "Enable HWTIMER1"
                  default n
  
              config BSP_USING_TIMER2
                  bool "Enable HWTIMER2"
                  default n
  
              config BSP_USING_TIMER3
                  bool "Enable HWTIMER4"
                  default n
  
              config BSP_USING_TIMER4
                  bool "Enable HWTIMER4"
                  default n
  
              config BSP_USING_TIMER5
                  bool "Enable HWTIMER5"
                  default n
  
              config BSP_USING_TIMER6
                  bool "Enable HWTIMER6"
                  default n
  
              config BSP_USING_TIMER7
                  bool "Enable HWTIMER7"
                  default n
  
              if SOC_TYPE_CV180X
                  config TIMER_IRQ_BASE
                      int
                      default 80
              endif
  
              if SOC_TYPE_SG2002
                  config TIMER_IRQ_BASE
                      int
                      default 79
              endif
          endif
  ```