The allocation of pixels does not reduce program storage and overwrite the program

[ednieuw]

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[ednieuw]

When using SK6821 LEDs the SoftwareSerial library stops the communication to the LEDs.
When the SoftwareSerial library is removed from the program the LEDs works OK.
The old slibrary NewSoftwareSerial library also interferes with the communication.
With the very old outdated library AFSoftSerial the LEDs works OK,
For the second serial communication (to Bluetooth) I use pin BT_RX = 6, BT_TX = 7. changing these pin numbers do not restore communication to the SK6812 LEDs
The SK6812 LEDs are connected to pin 5.
I use a Arduino Nano
When this line, SoftwareSerial Bluetooth(BT_RX, BT_TX); , is removed the communication to the LEDs is working.
I upgraded to the Arduino IDE 1.8.5

[driverblock]

Please post a complete sketch which demonstrates the problem, so that we can try to reproduce the problem.

[ednieuw]

DriverBlock.zip
Problem
After changing from the WS2812 library with WS2812 LEDs to AdaFruit Neopixels to use the SK6812 pixels two problems occurred.
1 The communication to the LEDs on pin 5 stopped when the Bluetooth connection to pin 6 and 7 was started with the SoftwareSerial library.
The FAB_LED library gave the same problems but after changing the RX en TX to higher pin numbers 10 and 11 the communication to the LEDs was working again. But this library uses too much memory and also did not work on pins 6&7. To use other pin numbers did not solved the problem with the Neopixel library
2 When typing text in the serial monitor to let the program do some action the text was read properly in function void SerialCheck(void) but is not passed in a String to the processing function ReworkInputString(SerialString);
when at line 600 // Serial.print(" Serialstring: "); Serial.println(SerialString); was introduced the function works as expected.
After preparing a small extract program, for you to test, no problems were found. Everything works without problems.
I removed and added many functions but until now I cannot pinpoint the problem.
An Arduino Nano and UNO behaves identically
I attached in the ZIP the small working script, the larger not working script and all the libraries from my Library folder

Thanks in advance
Ed

[ednieuw]

After renaming the defines used in my program and names of function calls with the program was rebuilt from the last working version until the communication error occurred.
I pin pointed the problem to the three dimensional bool array.
When the array
bool digit[][3][5] = {
{ {1, 1, 1, 1, 1}, {1, 0, 0, 0, 1}, {1, 1, 1, 1, 1} }, //0
{ {1, 0, 0, 0, 1}, {1, 1, 1, 1, 1}, {0, 0, 0, 0, 1} }, //1
{ {1, 0, 1, 1, 1}, {1, 0, 1, 0, 1}, {1, 1, 1, 0, 1} }, //2
{ {1, 0, 1, 0, 1}, {1, 0, 1, 0, 1}, {1, 1, 1, 1, 1} }, //3
{ {1, 1, 1, 0, 0}, {0, 0, 1, 0, 0}, {1, 1, 1, 1, 1} }, //4
{ {1, 1, 1, 0, 0}, {1, 0, 1, 0, 1}, {1, 0, 1, 1, 1} }, //5
{ {1, 1, 1, 1, 1}, {0, 0, 1, 0, 1}, {0, 0, 1, 1, 1} }, //6
{ {1, 1, 0, 0, 0}, {1, 0, 0, 0, 0}, {1, 1, 1, 1, 1} }, //7
{ {1, 1, 1, 1, 1}, {1, 0, 1, 0, 1}, {1, 1, 1, 1, 1} }, //8
{ {1, 1, 1, 0, 1}, {1, 0, 1, 0, 1}, {1, 1, 1, 1, 1} } //9
};
Becomes larger than digit[4] no signals are send to the SK6812 LEDs.
if( digit[0][3][5] ) { ....} was the statement that stopped the communication. when this line was removed signal were send to the LEDs.
After moving this array into PROGMEM the problem is solved.
Placing the array into PROGMEM is a work around I can live with.
Hope you can find out what stopped communication.

[ednieuw]

Update.
As long as sketch size stays under approx. 22500 bytes no problems occur.
Looks like a memory problem.
The amount of used LEDS in the initialisation: Adafruit_NeoPixel(NUM_LEDS, LED_PIN, NEO_GRBW + NEO_KHZ800);
does not change storage space.

NUM_LEDS = 144 LEDs
Sketch uses 22224 bytes (72%) of program storage space. Maximum is 30720 bytes.
Global variables use 1221 bytes (59%) of dynamic memory, leaving 827 bytes for local variables. Maximum is 2048 bytes.
NUM_LEDS = 72 LEDs
Sketch uses 22224 bytes (72%) of program storage space. Maximum is 30720 bytes.
Global variables use 1221 bytes (59%) of dynamic memory, leaving 827 bytes for local variables. Maximum is 2048 bytes.