使用hwclock读取rtc中的时间时报错"hwclock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: No such device or address"如何处理? 1. No such device or address 这一句表明当前的板子上没有这样的外设,检查设备树和硬件连接情况 2. 笔者是这样解决的 由于设备树中为rtc所指定的总线与硬件上的...
使用hwclock读取rtc中的时间时报错"hwclock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: No such device or address"如何处理? 1. No such device or address 这一句表明当前的板子上没有这样的外设,检查设备树和硬件连接情况 2. 笔者是这样解决的 由于设备树中为rtc所指定的总线与硬件上的...
使用hwclock读取rtc中的时间时报错"hwclock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: No such device or address"如何处理? 1. No such device or address 这一句表明当前的板子上没有这样的外设,检查设备树和硬件连接情况 2. 笔者是这样解决的 由于设备树中为rtc所指定的总线与硬件上的...
static int __rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm){ int err; if (!rtc->ops) err = -ENODEV; else if (!rtc->ops->read_time) err = -EINVAL; else { memset(tm, 0, sizeof(struct rtc_time)); err = rtc->ops->read_time(rtc->dev.parent, tm); } return...
The purpose of a battery-backupped hw clock however is to keep time, especially on power loss. Diagnosis Origin of theioctl(RTC_RD_TIME) to /dev/rtc to read the time failed: Invalid argumenterror. The origin can be tracked down tothis commitand these 2 lines of code: ...
}// 读取RTC设备中的时间if (ioctl(rtc_fd, RTC_RD_TIME, &rtc_tm) == -1) {perror("Failed to read RTC time");close(rtc_fd);exit(EXIT_FAILURE);}// 将时间转换为可读格式并输出printf("Current hardware clock time: %02d:%02d:%02d\n",rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec...
pi@voyager ~ $ sudo hwclock -r hwclock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: Input/output error But, if I issued two hwclock commands quickly, the first failed but the second responded Code: Select all pi@voyager ~ $ sudo hwclock -r hwclock: ioctl(RTC_RD_TIM...
Possibly a bigger problem is that RTC_RD_TIME and RTC_SET_TIME ioctls use struct tm with signed 32 bit seconts, and I don't know of another way to get/set the hardware clock from within Linux? Nothing obvious in drivers/rtc/dev.c in current git... the "seconds" in struct tm is...
static int __rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm){ int err; if (!rtc->ops) err = -ENODEV; else if (!rtc->ops->read_time) err = -EINVAL; else { memset(tm, 0, sizeof(struct rtc_time)); err = rtc->ops->read_time(rtc->dev.parent, tm); } return...
使用hwclock读取rtc中的时间时报错"hwclock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: No such device or address"如何处理? 2019-09-03 18:52 −... Jello 0 4603 188. Best Time to Buy and Sell Stock IV 2019-10-10 12:00 −Say you have an array for which the i...