GD32E230C Test 1: Simple Date and Time Display

hujj

GD32E230C Test 1: Simple Date and Time Display [Copy link]

    The system tick was used to display the date and time. Since no clock chip was added, the clock of this test project is not very accurate, with an error of several seconds per hour. Although the interruption time of the system tick can be adjusted through code, this is just an experiment, not a practical use, so I will not pursue accuracy. The following figure shows the date and time displayed on the development board: Since no clock chip was added, the date and time must be adjusted after booting up. The adjustment is done through the two onboard buttons Wakeup and Tamper. The Wakeup button is responsible for function selection. The default function is normal operation. After pressing the button, the year, month, day, hour, minute, and second are adjusted in turn. The following figure shows the year being adjusted, and the current adjustment value is displayed in reverse. The Tamper button is responsible for adjusting the value. The year ranges from 2010 to 2029. The date simply handles the big and small months and leap months in this year. The time is based on the 24-hour system. Since the long and short keys have not been debugged, the value adjustment is simply adding 1, and there is no function of quick adjustment or subtracting 1. The following is the package file of this test project, and those who are interested can download it for reference: text1.rar (442.24 KB, downloads: 100)

2019-2-27 12:52 上传

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蓝雨夜

GD32E230 has an internal RTC

hujj

Blue Rain Night posted on 2019-2-27 14:27 GD32E230 has RTC inside

Thank you for your advice! But I don't know how to use it yet, and I will slowly explore it. My main purpose of this exercise is to familiarize myself with the key operation and LCD control, and the date and time display are incidental. The next step is to familiarize myself with the control of RTC.

蓝雨夜

hujj posted on 2019-2-27 16:11 Thank you for your advice! But I don't know how to use it yet, so I'll learn it slowly. My practice is mainly to get familiar with the key operation and LCD control, and the date and time display...

There are examples in the package, which can be directly transplanted

hujj

    I initially transplanted the RTC program in the DEMO, which can display the year, month, day, hour, minute, and second. However, because this DEMO example refreshes the screen in the main loop, the display flickers slightly, which also affects my original timing, causing the software timing to be much slower. After testing, the RTC clock is not affected by reset, unlike my original software timing, which needs to be reset after each reset, but the original RTC still needs to be reset after powering on again.

hujj

    After debugging, the engine for time display was replaced with RTC, and the system tick was no longer used. However, the timing of this RTC was inaccurate, and it was more than ten seconds faster per minute. Perhaps there was something wrong with the settings.

hujj

    Through testing, I found that the advantage of using RTC is that the data is not affected by reset (it still needs to be reset when the machine is turned on). It is estimated that the data is placed in the flash register. The disadvantage is that the timekeeping error is relatively large. In addition, the year is counted in two digits, and 2000 needs to be added manually. In addition, it uses 4 binary digits to correspond to 1 decimal digit, which is convenient for display, but not so convenient for calibration. After comprehensive consideration, I still switched back to the system tick for timing, because this is an experiment after all, and it is really practical to use a timing chip. Today, I ordered a DS1302, so that the clock can be kept running by battery, and there is no need to calibrate the time every time the machine is turned on.