I need help with a programming problem

[G+_Newton Robinson]

I need help with a programming problem. I have created an LED matrix that is 50x36 WS2812B LED's. 6 strings of 50x6. I control each of the 50x6 matrix with an Arduino Nano. This works well using Jinx! under Windows. You can see the display in my previous posts.

 

What I want to do is record the Jinx! output, copy it to a Raspberry PI, then open the 6 serial devices connected to the Raspberry PI and send the data. I believe the Raspberry Pi can to this because there will be no calculations.

 

The following is the code on the Arduino that works with Jinx!:

 

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// Glediator script for WS2812B LEDs

// Found at: https://forum.pjrc.com/threads/32861-Glediator-Jinx-with-Teensy-3-2-and-WS2812b

// User mortonkopf 02-09-2016 @ 4:57 PM

// Tested with JINX!

// Set NUM_LEDS to the number of LEDS in the string your are controlling.

// Set dataline to the Arduino PIN you are going to use.

// You must install the FastLED Library.

// I have tested wint Arduino UNO R2 and R3. Arduino Mega 2560 R3 and SainSmart (Not sure which version)

 

#include "FastLED.h"

#define NUM_LEDS 300 // Set the number of LEDs

const int dataline = 6; // Arduino PIN

 

CRGB leds[NUM_LEDS];

 

void setup() {

Serial.begin(115200);

LEDS.addLeds(leds, NUM_LEDS);

}

 

int serialGlediator() {

while(!Serial.available()) {}

 

return Serial.read();

}

 

void loop() {

while(serialGlediator() != 1) {}

 

for(int i=0; i < NUM_LEDS; i++) {

leds.r = serialGlediator();

leds.g = serialGlediator();

leds.b = serialGlediator();

}

FastSPI_LED.show();

while(serialGlediator() != 1) {}

//delay(100);

}

 

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I have confirmed that when I plug the Arduino into the Raspberry Pi, the /dev/ttyUSB0 is created. I then did a chmod o+rw /dev/ttyUSB0.

 

What I think I'm doing. Opening /dev/ttyUSB0 for read write 8N1 for raw output. I also think that what I need to do is send 900 bytes to the Arduino. I then expect the code on the Arduino to display. The program seem to runs successfully, but nothing is displayed on the LED sign.

 

If someone can give me some pointers on the following code:

 

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#include

#include

#include

#include

#include

#include

#include

#include

 

using namespace std;

 

int main() {

char cmd[900];

 

int USB = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY);

 

if(USB < 0) {

cout << "No" << endl;

} else {

cout << "Yes" << endl;

}

 

struct termios tty;

memset(&tty, 0, sizeof tty);

 

if(tcgetattr(USB, &tty) != 0) {

perror("tcgerattr ");

}

 

cfsetospeed(&tty, B115200);

cfsetispeed(&tty, B115200);

tty.c_cflag &= ~PARENB; //Make 8N1

tty.c_cflag &= ~CSTOPB;

tty.c_cflag &= ~CSIZE;

tty.c_cflag |= CS8;

tty.c_cflag &= ~CRTSCTS; //No flow control

tty.c_lflag = 0; //No signaling chars, no echo, no canonical processing

tty.c_oflag = 0; //No remapping, no delays

tty.c_cc[VMIN] = 5; //0.5 seconds read timeout

tty.c_cflag |= CREAD | CLOCAL; //Turn on READ & ignore ctrl lines

tty.c_iflag &= ~(IXON | IXOFF | IXANY);

//Turn off s/w flow ctrl

tty.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);

//Make raw

tty.c_oflag &= ~OPOST; //Make raw

 

tcflush(USB, TCIFLUSH); // Flush port, then aplies attributes

 

if(tcsetattr(USB, TCSANOW, &tty) != 0) {

//cout << "Error " << errno << "from tcsetattr" << endl;

}

 

//**Write**

for(int i=0; i < 900; i++) {

cmd='a';

}

 

int n_written = write(USB, cmd, 900);

cout << n_written << endl;

cout << cmd << endl;

 

close(USB);

}