I would like to ask about the LCD display problem. Pictures are attached.

一百年后的自己

I would like to ask about the LCD display problem. Pictures are attached. [Copy link]

 

Please help, thank you.

29447945

?What's the question? There's no word yet, are you asking everyone to guess the question?

wsmysyn

If I could guess what your problem is, I would go to a fortune teller.

一百年后的自己

29447945 posted on 2019-10-15 13:34 ?What's the question? There's no word, are you asking everyone to guess the question?

Sorry, sorry. The meaning is that I don't know how to make this LCD display something. For example, there are 4 common terminals and 12 segment selections. How to light up the parts that should be lit?

一百年后的自己

wsmysyn posted on 2019-10-15 14:05 If I could guess what your problem is, I would go to a fortune teller.

Sorry, sorry. The meaning is that I don't know how to make this LCD display something. For example, there are 4 common terminals and 12 segment selections. How to light up the parts that should be lit?

一百年后的自己

For example, if I want to highlight the two words in the middle, I have to select all the paragraphs. How should I write it???

一百年后的自己

wsmysyn posted on 2019-10-15 14:05 If I could guess what your problem is, I would go to a fortune teller.

Sorry, sorry.

29447945

Posted by Myself One Hundred Years Later on 2019-10-15 14:35 Sorry, sorry. The meaning is that I don’t know how to make this LCD display something. For example, there are 4 common terminals and 12 segment selectors. How to click...

Are you asking about the software? I thought you had a hardware problem? You can figure it out based on the display's segment diagram. For example, if you have a common anode, then to light up the letter A, COM2 should be high and pin 18 should be low

一百年后的自己

29447945 Published on 2019-10-15 14:41 Are you asking about the software? I thought you had a hardware problem? You can figure it out based on the display's segment diagram. For example, if you have a common anode, then you need to light up the words...

Yes. It is software. For example, I light up the word 2.

Then there should be a problem with writing it this way.

sint27

From a software perspective, lighting up the LCD using this type of MCU with built-in LCD driver is not necessarily the same as lighting up the digital tube.

Many of the COM registers do not need to be taken care of after they are configured, and seg has a fixed address. Writing a value to the corresponding address will light up the corresponding field.

For details, please refer to the LCD routine of this MCU.

29447945

Myself a Hundred Years Later posted on 2019-10-15 14:53 Yes. It is software. For example, if I light up the word 2, then there should be no problem writing it this way

You need to control it according to the description of the display chapter of the chip SH79F, it is not enough to simply pull the IO high or low

一百年后的自己

sint27 posted on 2019-10-15 14:58 From a software perspective, lighting up the LCD with an MCU with built-in LCD driver is not necessarily the same as lighting up the digital tube. Many of them are not needed after the COM register is configured...

Great, thanks, I'll check the chip manual

一百年后的自己

29447945 Published on 2019-10-15 15:01 You need to control it according to the description of the display section of the chip SH79F. It is not enough to simply pull the IO high or low

OK, I'll check the chip manual.

wsmysyn

Myself a hundred years later posted on 2019-10-15 14:38 Sorry, sorry

This controls the high and low levels of the segment.

The program LCD interface is also similar to the read and write operation mapped to a memory. By directly reading and writing display data to a certain address, you can control the high and low IO of each segment code.

一百年后的自己

wsmysyn posted on 2019-10-15 15:11 This is to control the high and low levels of the segment, and that's it. The program LCD interface is also similar to the read and write operation mapped to a memory. Directly...

Write display data directly? For example, IIC, you need to create a write data function. Then write address 09H, and then light up the corresponding segment. It can light up. This is like the microcontroller is connected to LCD COM, seg is connected, how to do read and write operations?

一百年后的自己

wsmysyn posted on 2019-10-15 15:11 This is to control the high and low levels of the segment, and that's it. The program LCD interface is also similar to the read and write operation mapped to a memory. Directly...

Then I wrote it wrong.

wsmysyn

Myself a hundred years later posted on 2019-10-15 15:36 Then what I wrote is wrong

The above is right, this is not a simple manual control of IO status, otherwise this LCD controller is meaningless. The efficiency is no different from pure IO control.

You can't just start writing according to your own understanding without reading the information. Referencing the routines can help you avoid many detours. Even if you can't find a manual that corresponds to it one by one, you can look for the information of other chips with the same function.

29447945

Myself a hundred years later posted on 2019-10-15 15:03 OK, I'll go check out the chip manual

Data link: http://www.sinowealth.com/ftp//8051%20mcu/8bit%20flash%20mcu/ss388a_sh79f166a/SH79F166A%20CV2.2.pdf

Please read the contents of 8.1 in the manual, configure the relevant registers, and then write the contents to the registers.

8.1 LCD related content

Write related registers to control display content

btty038

There should be a logic table, I remember

一百年后的自己

29447945 Published on 2019-10-15 17:40 Data link: http://www.sinowealth.com/ftp//8051%20mcu/8bit%20flash%20mcu/ss388a_sh79f166a/SH79F166A% ...

These are the registers I assigned. But I cleared the addresses one by one. But some parts still have entanglement. Why is this?