Grove - RGB LED Matrix w/Driver examples

Products & Technology Grove
#1

Hi all,



I have been playing with the Grove - RGB LED Matrix w/Driver examples and have these successfully working on a Particle photon. Yay!



There are a bunch of examples and im trying to understand where the source of the pattern is actually stored.



For example the “displayEmoji” sample code which scrolls through a whole bunch of emojis has the following in the loop:



matrix.displayEmoji(i,5000,true);



so far so good. but where is the acutual array that makes up the emojis?



looking in the .cpp file there is:



void GroveTwoRGBLedMatrixClass::displayEmoji(uint8_t emoji, uint16_t duration_time, bool forever_flag)

{

uint8_t data[5] = {0, };



data[0] = I2C_CMD_DISP_EMOJI;

data[1] = emoji;

data[2] = (uint8_t)(duration_time & 0xff);

data[3] = (uint8_t)((duration_time >> 8) & 0xff);

data[4] = forever_flag;



i2cSendBytes(currentDeviceAddress, data, 5);

}



and in the .h file:



#include <Arduino.h>

#include <Wire.h>



#define I2C_CMD_DISP_EMOJI 0x02 // This command displays emoji



// /*************************************************************

// * Description

// * Display emoji on LED matrix.

// * Parameter

// * emoji: Set a number from 0 to 29 for different emoji.

// * 0 smile 10 heart 20 house

// * 1 laugh 11 small heart 21 tree

// * 2 sad 12 broken heart 22 flower

// * 3 mad 13 waterdrop 23 umbrella

// * 4 angry 14 flame 24 rain

// * 5 cry 15 creeper 25 monster

// * 6 greedy 16 mad creeper 26 crab

// * 7 cool 17 sword 27 duck

// * 8 shy 18 wooden sword 28 rabbit

// * 9 awkward 19 crystal sword 29 cat

// * 30 up 31 down 32 left

// * 33 right 34 smile face 3

// * duration_time: Set the display time(ms) duration. Set it to 0 to not display.

// * forever_flag: Set it to true to display forever, and the duration_time will not work.

// * Or set it to false to display one time.

// * Return

// * Null.

// *************************************************************/

void displayEmoji(uint8_t emoji, uint16_t duration_time, bool forever_flag = false);



but where is the actual array that makes up the image. I’m expecting to see something like this:



uint64_t example[] = {



0xffff5e5e5e5effff,

0xff5effffffff5eff,

0x5eff5effff5eff5e,

0x5effffffffffff5e,

0x5eff5effff5eff5e,

0x5effff5e5effff5e,

0xff5effffffff5eff,

0xffff5e5e5e5effff,



0xffff29292929ffff,

0xff29ffffffff29ff,

0x29ff29ffff29ff29,

0x29ffffffffffff29,

0x29ff29292929ff29,

0x29ffffffffffff29,

0xff29ffffffff29ff,

0xffff29292929ffff,



0xffff00000000ffff,

0xff00ffffffff00ff,

0x00ff00ffff00ff00,

0x00ffffffffffff00,

0x00ffff0000ffff00,

0x00ff00ffff00ff00,

0xff00ffffffff00ff,

0xffff00000000ffff

};



Any clues or help much appreciated!



Cheers

Greg

#2

Hi Greg,



Some emojis inside the firmware of RGB LED Matrix.



Best Regards,

Blu

#3

Hi,



The emojis are stored in the firmware of the driver and when you call it from the code it gets the emoji data via I2C communication.



void GroveTwoRGBLedMatrixClass::displayEmoji(uint8_t emoji, uint16_t duration_time, bool forever_flag)

{

uint8_t data[5] = {0, };



data[0] = I2C_CMD_DISP_EMOJI;

data[1] = emoji;

data[2] = (uint8_t)(duration_time & 0xff);

data[3] = (uint8_t)((duration_time >> 8) & 0xff);

data[4] = forever_flag;



i2cSendBytes(currentDeviceAddress, data, 5);

}



If you want to display your custom emoji then you can follow this DIY part:

<LINK_TEXT text=“http://wiki.seeedstudio.com/Grove-RGB_L … river/#diy”>http://wiki.seeedstudio.com/Grove-RGB_LED_Matrix_w-Driver/#diy</LINK_TEXT>





I hope it will help you.



Thank you.

#4

Thanks, that makes sense.



Do you know if the driver firmware is open source? Where might i find it?



Thanks,

Greg