Nb-iot control LCD (date setting and reading)

One 、 Realization effect

Two 、 Project requirement

y

• The initial train diagram shows the current date （ year 、 month 、 Japan ）.
• Press Key4 key , Display the setting diagram , The black triangle indicates the current setting item ,key2 Press the key to move up the black triangle setting item ,key3 Press the key to move down the black triangle setting item
• Press key4, Enable in the current setting @ Symbol , On the board LED2 The light is on , Indicates that the current setting item can be modified ,key2 Key setting item plus 1,key3 Key setting item minus 1,.
• After modifying the setting item , Press key4, close @ Symbol , On the board LED2 The light goes out , Save the current value , Return to the setup diagram .
• In the setting diagram state , Press key1 Reset key returns to the initial operation diagram , The newly set date is displayed .

3、 ... and 、 Code implementation and analysis

int main( void )