MSP430FR2355: LCD JHD1313 cannot figure from datasheet how to write to configure and display????

Steve Wenner

Part Number: MSP430FR2355

Hello...

I am using and monitoring I2C from an MSP430FR2355....The attached LCD has a I2C interface and under the hood converts RS, E, etc. I am trying to use the datasheet to send commands and configure the device but am only having partial luck and not completely understanding how to send UART commands to the device....

See attached datasheet LCD

Firstly I would like to configure the address space (pages 16 - 17)......and then I would like to be able to move the cursor to a position and print something.....

Does anyone have any idea how to send a configuration command? What address do I send ???....I can easily see the registers and understand the values I want to place in them but it does me NO good to send the LCD I2C Address + W and follow it up with just commands...I dont understand how or even if I should incorporate the RS somehow into a character to send down to the LCD???

Thanks

over 3 years ago

0 Bruce McKenney over 3 years ago

Guru 100705 points

It looks like Seeed provides a library as source code. There are probably clues there.

0 Steve Wenner over 3 years ago in reply to Bruce McKenney

Genius 3240 points

I'm in there and finding some stuff but not what I need....For instance I think you have to send an 80 each time prior to the command....Seems to work...But I am having NO luck placing the cursor with DDRAM command and setting a value....I write 7C 85 35 onto I2C bus and expect (or hope) cursor moves to row 1 position 5 and prints a 5....No luck.... Then I am not sure how to move to line two???? According to alll I've seen on a 16x2....0 - F is first line and 40 - 4F is second line so I would think line one addressing would be 80 -8F and line two would be C0 - CF but when I do any of this the cursor disappears off the LCD

0 Brandon Fisher94 over 3 years ago in reply to Steve Wenner

TI__Mastermind 28075 points

Hi Steve,

You may also find this useful: https://theiotlearninginitiative.gitbook.io/internetofthingssensors/layers-of-abstraction/linux-i2c-device-interface/lcd-rgb-text

It discusses the development of drivers for the JDH1313/JHD1214 in Linux.

Best Regards,
Brandon Fisher

0 Steve Wenner over 3 years ago in reply to Brandon Fisher94

Genius 3240 points

Thank you....

I was able to figure it out....it is convoluted and the datasheet for sure doesn't do a good job....Long story short (mostly for me to look back on)

To move display send 0x80 then 4x --- for line 1 and Cx for line 2 where x is 0 - F for position....

After this use command 0x40 then Value ie 0x35 for character '5'

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MSP430FR2355: LCD JHD1313 cannot figure from datasheet how to write to configure and display????