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
build\boards\cv180x\cv1800b_sophpi_duo_sd\u-boot\cvi_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
