[RSIC-V]Milk-V開發(fā)板測試pwm及波形輸出

# [RSIC-V]Milk-V開發(fā)板測試pwm及波形輸出

## 簡介

## 加載pwm模塊
```
[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

### 原理圖

### 修改pinmux

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

## 測試

```
//pwm10，也就是pwmchip8的第三個，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

審核編輯：劉清