System: 64-bit Kernel version: 6.6 Debian version: 12 (bookworm) $ sudo ./load_module.sh insmod: ERROR: could not insert module hc_sr04.ko: Operation not permitted $dmesg [ 5297.940325] [HC-SR04]: ERROR: GPIO 15 request The failure ofgpio_requestcause the failedinsmod: Operation not per...
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其原型为int gpio_request(unsigned gpio, const char *label)先说说其参数,gpio则为你要申请的哪一个管脚,label则是为其取一个名字。其具体实现如下: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 ...
gpio_request Fails in linux 4.14.98 10-09-201903:50 AM 2,120件の閲覧回数 yashavantha_yas Contributor I Hi, I am using Linux 4.14.98 Ga release source. Here when I tried to requets a gpio in 'arch/arm/mach-imx/mach-imx6q.c', it fails with EPROBE_DEFER (517) error....
printk("successed to request gpio\n"); gpwm->status = PWM_DISABLE; } } return 0; err_device_create: device_destroy(pwm_class,gpwm->devno); err_class_error: class_destroy(pwm_class); return ret; }注册了字符设备后,/dev/目录下会生成pwm1\pwm2\pwm3\pwm4四个字符设备。可以在应用层去...
GPIOToggle函数 gpio函数原型是什么,其原型为 intgpio_request(unsignedgpio,constchar*label) 先说说其参数,gpio则为你要申请的哪一个管脚,label则是为其取一个名字。其具体实现如下:intgpio_request(unsignedgpio,constchar*label){structgpio_desc*de
1、gpio_request函数 gpio_request函数用于申请一个GPIO管脚,在使用一个GPIO之前一定要使用gpio_request进行申请,函数原型如下: int gpio_request(unsigned gpio, const char *label) 函数参数和返回值含义如下: gpio:要申请的gpio标号,使用of_get_named_gpio函数从设备树获取指定GPIO属性信息,此函数会返回这个GPIO的标...
[ 2.154614] failed to request rs232 enable GPIO err: -517 This is my driver source code, could you please give me some help? struct gpio_desc rs232_enable_gpio; rs232_enable_gpio = devm_gpiod_get_index_optional(dev, "rs232-enable", 0, GPIOD_OUT_LOW); if (IS_ERR(rs232_enable...
@@ -716,7 +717,7 @@ static __always_inline void _spidev_set(int fd, unsigned long request, void *val 716 717 static int spidev_send(int argc, char *argv[]) { 717 718 int ret = 0; 718 719 int fd; 719 - unsigned i;// = _IOR(1,2,u8); 720 + unsigned i; 720...
[ 0.210546] display_fb_request,fb_id:0 [ 0.219823] Freeing logo buffer memory: 900K [ 0.220267] disp_al_manager_apply ouput_type:1 [ 0.220383] [DISP] lcd_clk_config,line:732: [ 0.220395] disp 0, clk: pll(114000000),clk(114000000),dclk(19000000) dsi_rate(114000000) [ 0.220395] clk...