在引擎盖下面,libgpiod打开内核为行提供的fd,然后调用ioctl(fd, GPIO_V2_LINE_SET_VALUES_IOCTL, ...)。我的问题是:ioctl()调用在理论上是否一般是阻塞的?例如,首先请求行也涉及到芯片fd上的ioctl()。I2C ioctl()s呢?如果它是阻塞的,是行结构(line-&g 浏览0提问于2021-07-01得票数 5 回答...
GPIO_GET_LINEINFO_IOCTL gpio: userspace ABI for reading/writing GPIO lines commit:d7c51b47ac11e [GIT PULL] bulk GPIO changes for v4.8(Jul 25, 2016) ioctl GPIOHANDLE_GET_LINE_VALUES_IOCTL GPIOHANDLE_SET_LINE_VALUES_IOCTL GPIO_GET_LINEHANDLE_IOCTL gpio: userspace ABI for reading GPIO lin...
Add LG_I2C_RDRW_IOCTL_MAX_MSGS Add LG_MAX_SPI_DEVICE_COUNT Add LG_MAX_I2C_DEVICE_COUNT Add LG_I2C_END Add LG_I2C_ESC Add LG_I2C_ADDR Add LG_I2C_FLAGS Add LG_I2C_READ Add LG_I2C_WRITE V1.27 (23 July 2023) Add lgGpioReport_t Structure ...
[snip] > > > > > +static int lineinfo_ensure_abi_version(struct gpio_chardev_data *cdata, > > > > + unsigned int version) > > > > +{ > > > > > > > + int abiv = atomic_read(&cdata->watch_abi_version); > > > > + > > > > + if (abiv == 0) { > > > > >...
> > > > > +static int lineinfo_ensure_abi_version(struct gpio_chardev_data > > > > > *cdata, > > > > > + unsigned int version) > > > > > +{ > > > > > > > > > + int abiv = atomic_read(&cdata->watch_abi_version); ...
intret=ioctl(Fd,GPIO_GET_CHIPINFO_IOCTL,&chipinfo); 1679+ if(0==ret) { 1680+ if(wiringPiDebug) { 1681+ printf("%s: name=%s, label=%s, lines=%u\n",szGPIOChip,chipinfo.name,chipinfo.label,chipinfo.lines) ; 1682+ } 1683+
Via sysfs, GPIOs could be read/written using the value file. For GPIO character devices, theGPIOHANDLE_GET_LINE_VALUES_IOCTLandGPIOHANDLE_SET_LINE_VALUES_IOCTLmay be used to get/set the state of one or more offsets within the chip. ...
> static int lineinfo_ensure_abi_version(struct gpio_chardev_data *cdata, > unsigned int version) > { > int abiv = atomic_cmpxchg(&cdata->watch_abi_version, 0, version); > > if (abiv == version) > return 0; > > return abiv; ...
Fixes #62 GPIO Chips with labels pinctrl-* are sorted to register first. This is a kernel convention identifying a GPIO chip that has exported/user lines. Handling for potential duplicate chips was...
Read the value of an input by calling gpiod_line_get_value() or set the level of an output by calling gpiod_line_set_value(). When done, release the lines by calling gpiod_line_release() and chips by calling gpiod_chip_close().Other...