Hi,

your library is very useful. I wrote a sketch with many string, and there was problems… I suspected a problem with RAM…

Few minutes to add your library in my sketch and everything work well : thanks !!

XH

You say:
“Then add a couple of inline print methods — alongside all the others — to the body of class Print:

void println(const _Printable &obj)
{ obj.print(*this); println(); }
void print(const _Printable &obj)
{ obj.print(*this); }

Should these be ‘inline’?

Why does this not work? and what would be a good way to implement something like returning a string stored in ROM based on the case?

String identifydata(int x){ //accepts a binary number and returns a corresponding number that matches into state[“blah”] to match to a human string
//Serial.print(x); // see what binary number were trying to match
FLASH_STRING(yo,”YOO”)
switch(x){
case 0 : // see if binary number matches zero
return (yo);
break;
case 1010101010:
return(1);
break;
case 1110000111:
return(2);
}

Is there a way to write to an individual element of a flash_table.

First I initiated and a table:

FLASH_TABLE(boolean,relay,10,
{0,0,0,0,0,0,0,0,0,0},
{0,1,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,0});

I can read a specific element with the phrase:

Serial.println(relay[i][0],BIN); //[row][col]

I would like to write to an element in the same way although the following doesn’t work:

boolean relay[i][1]=1;

Jumping into building a reverse geocache box and would like to use the libraries that you have generously made available.

What compiler would you recommend?

Thanks.
Meredith

Is there any way to store variables into flash memory?

i.e:

int i = 2;
int j = 9;
int k = 3;
FLASH_ARRAY(int, font_table2, i,j,k);

Thanks!

Hi. Im new to coding and Arduino.

I have a project that uses a thermistor to return a temp value and print it to an LCD.

I would like to use a lookup table, that would look up a temp against the ADC value from the thermistor..

i just cant find out how to create such a table in the code, and be able to call on it to return me a temp that i can then print to the LCD.

i can easily get the ADC vs temp table such as

ADC Temp
100 23C
200 24C
300 25C
etc etc.

But i dont know how to do that in code.

Can you tell me how to do it? or point me in the right direction?

Ive searched the arduino site, and google and cant find anything that gives me a breakdown on how to create the table that i want and how to compare an ADC value and get a result.

Hi!
Thank you for a nice lib. I’m just quite new to C and to arduino and I would need to explain one thing. Can I create a function to accept what’s generated by your FLASH_STRING_ARRAY, FLASH_TABLE or FLASH_STRING macros as a parameter? Could you give me some hint how to do that? Thanks a lot!

How would I store a 2 dimension array with Flash.h??

char * menu[][2] = {
{“Item 1″,”apples, coke” },
{“Item 2″,”OJ, Cranberry” },
{“Item 3″,”Peach, Bamboo” },
{“Item 4″,”cheese, carrots” },
{“Item 5″,”big fluffy chicken cat” }
};

Do I have to build two different String Arrays? Can you store char arrays inside of a Table Array??

Hi Mikal,

I have made a lookup string, but when i try to use it as in your example, the string is too long. There are 9 characters printed instead of 8. Here is the code:
FLASH_STRING(xgvoice, “GrandPnoGrndPnoKMelloGrPPianoStr”);

myGLCD.setBackColor(0,0,0);
char temp_str[8] = {0};
xgvoice.copy(temp_str, 8, vc*8);
myGLCD.print(temp_str,x,y);

Do you know what i did wrong?

Thanks, Pim.

Hi Mikal,

I am trying to use your Flash library to write two data tables, which are then used for interpolation (using Kerinin’s Spline library); however, when I try to compile, the spline function errors out saying invalid conversion from _FLASH_ARRAY to float. Any ideas on how to fix this with your library. (I am trying to pass the two arrays to the function)

Here is the line of code:
Spline linearSpline(alt_a.access(),rho_a.access(),51,1);

Thanks!

Thanks for a great library. I’ve got one newbie C++ question though …

I’ve created a class which uses a flash array which is quite large (it holds graphics information). I want to split this flash array out into its own library file “Graphics.cpp” and have the class library include the Graphics library. I’ve tried a number of ways to do this but I’m not getting anywhere – Can this be done?

Thanks – J.

Mikal,

This thing is great! My project will be using a 4×40 LCD, so I’ll be using a lot of strings. Even now my I have a test program that I use to test the electronics and unit test my classes and that thing was failing to run on an Uno because of quoted strings. I switched to Flash and I’m in great shape again. Thanks so much for this great contribution.

-Bryan
aka anthrolume

Hi Mikal,

I am using your library with great success now. I have found it convenient to make one small change, and I suggest that perhaps you roll that change into the next official version.

I have found it useful to subclass _FLASH_STRING. To facilitate that, I’ve changed the “private” on _arr to “protected”. In my experience, if I can even vaguely imagine someone ever wanting to subclass a class I write, I use protected for the data members – it’s saved my ass many times. :-)

Thanks again for this great library. I’m abusing flash strings to store a compact representation of arrays of LED addresses for pattern animations in my project. It’s working great.

-Bryan
aka anthrolume

I have an array of motivational slogans.

void show() // Function shows a slogan.
{FLASH_STRING_ARRAY(slogans, // Program memory slogans.
PSTR(“Go all-out!”), // Slogan 0, top line.
PSTR(“”), // Slogan 0, bottom line.

But the count of slogans is so far manual.

int slogan = 2 * random(93); // Randomly select a slogan.
lcd << slogans[slogan]; // Display slogan top line.
lcd.setCursor(0, 1); // Put the cursor bottom left.
lcd << slogans[slogan + 1]; // Show slogan bottom line.

I have been unable to get an automatic count to work.

Size. Each Flash type provides a mechanism for determining its size:
String and String Array: size_t length();
Array: size_t count();

I have found this cryptic, and would appreciate examples!

Hi, I want to store and to access to a bidimensional array 103×103 of integer numbers, that’s a look up table of a fuzzy controller. Is this library the right way to implement my l.u.t? in case the answer is yes wich is the code that better fit that?
thank you in advance

Hi, I would like using the flash memory of my Arduino UNO, in order to store values in a bidimensional vector and modify it while the program is running. Add new values and delete others. Is it possible? How can I do this? I’m trying to modify a FLASH_STRING but I don’t have success.

Hi i’m new to arduino and programming, but ive found this library very useful in an arduino project om working on. Ive got the FLASH_ARRAY to work for integer arrays but not for floating point number arrays. is something like this acceptable?

FLASH_ARRAY(float, points,
2.082E+001 ,3.272E+001,
2.071E+001 ,3.295E+001,
2.039E+001 ,3.295E+001
);

im have trouble reading each number from the array, it works if i use it as a normal array but for my project i need large arrays of hundreds of floating point numbers.

anyway thanks for this amazing library its helped me out a lot! :)

I am using FLASH_STRING_ARRAY but i cant understand why must be declared inside the body of a function.

Why cant use it as global?
I need global a FLASH_STRING_ARRAY

Mikal,
I’m doing some curve fitting and want to store an array of structs instead of native type. compiling print yields errors because

no matching function for call to ‘Print::print(mypoint_t)
which is expected.

I have two options here
1. hack on print to print my struct
2. individually store mypoint_t as separate arrays

I’m leaning towards option 2. Have any advice?

Thanks,
Craig

Dr. Craig Hollabaugh
Senior Engineer at Brightleaf Technologies

Hi Mikal
sorry It works now It was a problem in my programming
thanks

So this doesn’t seem to work with the Streaming library. As soon as I changed my int array to FLASH_ARRAY it said the name was not declared so I moved the #includes around and then it complained about my _DEC(foo) modifier in streaming so I took that out and then just got a barrage of errors. I thought maybe the patch would fix it but I don’t think I put the second part in the right place. I can’t seem to find where to put it. Any help would be appreciated. I’m using 6 libraries and am at 800 lines so it’s getting very confusing AND my SRAM is overflowing all over the place!

Mikal, (<cool spelling btw)

I was able to get it working and your library saved my butt. I had 2 80 int arrays which froze everything up. I however, did still remove anything to do with streaming which ended up not being a big deal. Thanks for your great library. You can remove my previous comment and this one.

Hi Mikal,
A couple of things I’ve noticed…

Flash.h has to be included after Streaming.h , otherwise the defines collide and, for instance, endl becomes a missing symbol.

Flash.h doesn’t have #include guards, if you need to include it from different files it’ll complain.

Great job, btw!

hi,

I’m experiencing some strange behaviors while using this library. I’m not sure if this is my fault or a bug in your lib. My problem the following:

I have a table with values:

FLASH_TABLE( unsigned int, FScene_1, 3,
{4000, 2000, 333},
{2550, 300, 2555},
{100, 2002, 400}
);

now I try to access the individual values:

unsigned int t0 = FScene_1[0][0];
unsigned int t1 = FScene_1[0][1];
unsigned int t2 = FScene_1[0][2];

now if I print these:

Serial.println(t0); // will output 4000 -> correct
Serial.println(t1); // will output 4000 -> wrong, should be 2000
Serial.println(t2); // will output 4000 -> wrong, should be 333

the strange thing is, if I print them directly:

Serial.println(FScene_1[0][0]); // will output 4000 -> correct
Serial.println(FScene_1[0][1]); // will output 2000 -> correct
Serial.println(FScene_1[0][2]); // will output 333 -> correct

… now, everything seems to work fine?!?!?!

I really don’t get it if I’m doing something fundamentally wrong or if there is a mysterious bug somewhere!

thanks
Andreas

If I got 366 lines looking like this:

1 1 08:44
1 2 08:45
1 3 08:46
10 1 08:55
10 2 08:56
11 12 09:30
11 13 09:32

Then I need to search for ex. “10 2” and then recive “08:56”

How to do that ?

I’m having trouble passing _FLASH_TABLE type to a function. The table structure is:

// Decimal 1-wire unique ids in Decimal format
FLASH_TABLE(int, ds18b20address, 8,
{40, 120, 70, 86, 03, 00, 00, 103},
{40, 97, 67, 86, 03, 00, 00, 120},
{40, 59, 64, 86, 03, 00, 00, 215},
);

I make the call as:

payload.dpFzHpnt_temp = readout1wire(ds18b20address[DOWN_PANTRY_FRZR_HPNT]);

The function is called as:

static int readout1wire (_FLASH_TABLE addr[]) {

The error message is:

Reefers:34: error: missing template arguments before ‘addr’
Reefers:146: error: redefinition of ‘int readout1wire’

where 34 is the #include and 146 is the function line.

Maybe a better question would be: Is it possible to pass the 1st or 2nd dimension of 8 elements, or would I need to copy to a local array?

Great work, by the way. I’ve used everything else in the lib with great success.

Hi Mikal,

I am trying to use your libary to store a large array, 256×256 chars, running on an Arduino Mega 2560.
I keep on getting an “size of array too large” error but I thought that 1 byte x 256 x 256 should fit in the 256kB flash of the arduino (the rest of the code is under 1kB)

Am I using your libary incorrectly?
My code is (leaving out the lut, but I can send this if it’s any help,
#include
FLASH_TABLE(byte, lut, 256,
{x,x,x,x,…},{…},etc,{}
);

Thanks!

David

Mikal,
If I had two arrays that I wanted to reference to each other how would I correlate the position of one array to the other similar to a look up table function?

To use your example above:

FLASH_ARRAY(float, temperatures, 23.1, 23.1, 23.2, 23.2, 23.4);

FLASH_ARRAY(float, tempvoltage, 1.5, 2.0, 2.5, 3.0, 3.5);

How would I write the code to return 23.1 if tempvoltage=1.5?

Or am I completely wrong on the opertion here?

Thanks for any assistance!

Hi Mikal, thank you for your work. I´m just starting with Arduino and i appreciate it.

Just one thing, I´ve downloaded your Flash library and in Flash.h I had to change the line with WProgram.h with this to work properly with the new environment Arduino 1.0

Maybe you want to change it so it works for everybody.

As I said before, thank you.

Hi,

Can someone explain why the sketch below does not seem to assign the correct value (9) to the variable x2?

I get the following output:
————————
5 , 9
5 , 5
————————

Of course I expect the 2nd line to be identical to the 1st, but it’s not… (using arduino 0022 with arduino nano 328)

thanks,
Erik

CODE:
——————————

#include
FLASH_ARRAY(int, arrayData, 5, 9);

void setup() {
Serial.begin(57600);
int x1=arrayData[0];
int x2=arrayData[1];
Serial.println(“————————“);
Serial.print(arrayData[0]);Serial.print(” , “);Serial.println(arrayData[1]);
Serial.print(x1);Serial.print(” , “);Serial.println(x2);
Serial.println(“————————“);
}

void loop() {
}