V3.0 Grove LCD Not Displaying Text (JHD1313M2)

[Chris_S_Intel]

Developing basic "Hello World" example on Edison using JHD1313M2 Grove LCD and release 2.1 Yocto image. LCD backlight color updates with no issue, but text not displaying at all.

• Eclipse and g++ compiles with no errors.
• Tried on 3 different I2C ports using v2 base shield.
• Verified LCD is connected to 5V.

Do I required update header file for JHD1313M2 or is JHD1313M1 adequate?

• Jhd1313m1(int bus, int lcdAddress = 0x3E, int rgbAddress = 0x62);

Using the following header files from: C:\Intel\iotdk-ide-win\devkit-x86\sysroots\i586-poky-linux\usr\include\upm, file structure as follows:

• grove.h, jhd1313m1.h, lcd.h, lcm1602.h, LCDTest.cpp
• g++ LCDTest.cpp -o output.sh -lupm-i2clcd - lupm-grove -lmraa
• ./output.sh

LCDTest.cpp code as follows:

# include "grove.h"

# include "jhd1313m1.h"

# include

# include

# include

# include

int main()

{

upm::Jhd1313m1* lcd = new upm::Jhd1313m1(0);

lcd->setColor(255, 0, 255); //WORKS

std::stringstream row_1;

row_1 << "Hello World";

lcd->setCursor(0,0);

lcd->write(row_1.str()); //DOESN't WORK

return MRAA_SUCCESS;}

[GFong]

FWIW, I am not also getting text to display on JHD1313M1 (the v2 version of the LCD). I'm using Johnny-five. I tried multiple variations of https://github.com/rwaldron/johnny-five/blob/master/eg/grove-lcd-i2c.js https://github.com/rwaldron/johnny-five/blob/master/eg/grove-lcd-i2c.js and just like above, I can change the background but I cannot display text. If you happened to resolve this issue, please post your solution. Otherwise, I'll wait for someone's response with bated breath.

EDIT: I forgot to mention my env.

I'm using an Edison on an Arduino BB w/ a Grove RGB LCD on a Grove base shield.

[GFong]

Alright. I figured it out. Actually, someone else figured it out and I read their post online. The Arduino BB and Grove BS have to be set to 5v. I had the base shield at 3v. Once I flipped the switch, it worked. Hope that works for you flux2002.

[Chris_S_Intel]

I did see similar article on voltage. This was one thing a triple checked with voltmeter before posting. Unfortunately even after ensuring 5V selected on BS and measuring 5V at LCD, still no text, only RGB backlight. I would like to know what was changed between v2.0 and v3.0 Grove LCD as wondering if any changes could cause this issue with posted code/addresses in original posting.

[Pedro_M_Intel · Accepted solution]

If you are still interested, you could try the following example code:

https://github.com/intel-iot-devkit/upm/blob/master/examples/c%2B%2B/jhd1313m1-lcd.cxx upm/jhd1313m1-lcd.cxx at master · intel-iot-devkit/upm · GitHub

You can compile the code above with the command:

g++ -o lcd lcd.cxx -I /usr/include/upm/ -lupm-i2clcd

Before doing so, you should install MRAA. In order to do so type the following:

echo "src mraa-upm http://iotdk.intel.com/repos/1.5/intelgalactic-dev http://iotdk.intel.com/repos/1.5/intelgalactic-dev" > /etc/opkg/mraa-upm.conf

opkg update

opkg install libmraa0

If you don't have any more repos configured do: opkg upgrade. Don't do this if you have AlexT's repo configured, if you do so, you'll be left out without any space in your board.

Peter.

[Chris_S_Intel]

Peter, this ultimately worked, thanks! I first ran opkg update with src mraa-upm. and ran sample program, but text still did not display. I then ran opkg upgrade and ran sample program, "Hello World" and text then displayed. I am using Intel's 2.1 Yocto image and Intel repos, but thank you for note on AlexT.

[Pedro_M_Intel]

Great to hear that it worked . If you ever encounter any other issue, don't hesitate to come back to the community.

Peter.