[RSIC-V]Milk-V开发板测试pwm及波形输出

# [RSIC-V]Milk-V开发板测试pwm及波形输出

## 简介

## 加载pwm模块
```
[root@cvitek]/mnt/system/ko# ls
3rd                      cv180x_pwm.ko            cv180x_vpss.ko
cfbcopyarea.ko           cv180x_rgn.ko            cv180x_wdt.ko
cfbfillrect.ko           cv180x_rtc.ko            cvi_mipi_rx.ko
cfbimgblt.ko             cv180x_rtos_cmdqu.ko     cvi_vc_driver.ko
cv180x_base.ko           cv180x_saradc.ko         cvi_wiegand.ko
cv180x_clock_cooling.ko  cv180x_sys.ko            cviaudio_core.ko
cv180x_dwa.ko            cv180x_thermal.ko        efivarfs.ko
cv180x_fast_image.ko     cv180x_tpu.ko            fb_ssd1306.ko
cv180x_jpeg.ko           cv180x_vcodec.ko         loadsystemko.sh
cv180x_mon.ko            cv180x_vi.ko             snsr_i2c.ko
```
```
insmod /mnt/system/ko/cv180x_pwm.ko
```
```
[root@cvitek]/sys/class/pwm# ls
pwmchip0   pwmchip12  pwmchip4   pwmchip8
```

## 例子：PWM10
 

### 原理图

### 修改pinmux
 

buildboardscv180xcv1800b_sophpi_duo_sdu-bootcvi_board_init.c
```
//PWM10
PINMUX_CONFIG(SD1_GPIO1, PWM_10);
```

## 测试
 

```
//pwm10，也就是pwmchip8的第三个，也就是pwmchip8/pwm2
echo 2 > /sys/class/pwm/pwmchip8/export
echo 1000000 > /sys/class/pwm/pwmchip8/pwm2/period
echo 500000 > /sys/c
lass/pwm/pwmchip8/pwm2/duty_cycle
echo 1 > /sys/class/pwm/pwmchip8/pwm2/enable
```
## 波形

审核编辑：刘清