重新启动后首次运行wiringPiISR会报错：
If you run wiringPiISR for the first time after restarting, an error will be reported:
wiringPiISR: unable to open /sys/class/gpio/gpioXX/value
但是去看这个路径，文件实际上就是生产了，而且不运行这句话就不会生成，我判断可能是生产的时间比代码运行的时间要晚了一些。
But if you look at this path, the file is actually produced, and it won't be generated if you don't run this API, so I think it may be that the production time is a little later than the code run.
所以我尝试在代码wiringPi.c那边增加了一次的再运行功能：
So I tried to add a retry once to the wiringPi.c file:
if (sysFds [bcmGpioPin] == -1)
{
sprintf (fName, "/sys/class/gpio/gpio%d/value", bcmGpioPin) ;
if ((sysFds [bcmGpioPin] = open (fName, O_RDWR)) < 0)
{
delay(1*1000);
if ((sysFds [bcmGpioPin] = open (fName, O_RDWR)) < 0)
return wiringPiFailure (WPI_FATAL, "wiringPiISR: unable to open %s: %s\n", fName, strerror (errno)) ;
}
}
这下就不会再出现问题了。这应该是个BUG，请修正。
There will be no more problems now. this should be a BUG, please fix it.
重新启动后首次运行wiringPiISR会报错： If you run wiringPiISR for the first time after restarting, an error will be reported: wiringPiISR: unable to open /sys/class/gpio/gpioXX/value 但是去看这个路径，文件实际上就是生产了，而且不运行这句话就不会生成，我判断可能是生产的时间比代码运行的时间要晚了一些。 But if you look at this path, the file is actually produced, and it won't be generated if you don't run this API, so I think it may be that the production time is a little later than the code run. 所以我尝试在代码wiringPi.c那边增加了一次的再运行功能： So I tried to add a retry once to the wiringPi.c file:
if (sysFds [bcmGpioPin] == -1) { sprintf (fName, "/sys/class/gpio/gpio%d/value", bcmGpioPin) ; if ((sysFds [bcmGpioPin] = open (fName, O_RDWR)) < 0) { delay(1*1000); if ((sysFds [bcmGpioPin] = open (fName, O_RDWR)) < 0) return wiringPiFailure (WPI_FATAL, "wiringPiISR: unable to open %s: %s\n", fName, strerror (errno)) ; }
} 这下就不会再出现问题了。这应该是个BUG，请修正。 There will be no more problems now. this should be a BUG, please fix it.