warning: narrowing conversion of '-1' from 'int' to 'unsigned int' inside { } [-

Projects Programming
1

Hi all,

I've googled this but other issues I see are all related to converting int to char. I'm just assigning integers to unsigned int.

This is an example code replicating the issue:

unsigned int rawCodes[3] = {0, 1, -1};

Any negative values drop this error:

  • warning: narrowing conversion of '-1' from 'int' to 'unsigned int' inside { } [-Wnarrowing]

This is for an IR sender project I'm doing just to have a play. I read the raw valued using a reader which gives me many positive and negative values, then I send it using the IRRemote Library.

What am I missing or should change?

Here's the full code:

#include <IRremote.h>

IRsend irsend;

unsigned int rawCodes[439] = {3528, -1696, 440, -428, 440, -1292, 468, -400, 440, -424, 440, -428, 468, -400, 440, -424, 412, -456, 440, -424, 468, -400, 464, -428, 440, -428, 440, -424, 440, -1292, 468, -400, 436, -428, 444, -424, 444, -424, 440, -424, 440, -428, 440, -424, 444, -1288, 412, -1320, 440, -1296, 468, -396, 468, -428, 436, -1296, 436, -428, 440, -428, 440, -424, 440, -428, 440, -428, 436, -428, 412, -456, 440, -424, 440, -428, 440, -424, 440, -428, 436, -432, 436, -428, 440, -452, 444, -424, 436, -428, 440, -428, 440, -424, 416, -452, 440, -428, 440, -424, 440, -428, 440, -424, 440, -428, 440, -428, 436, -428, 444, -424, 468, -424, 440, -424, 444, -424, 444, -1288, 468, -1264, 440, -428, 436, -432, 440, -424, 444, -424, 436, -428, 412, -10008, 3528, -1700, 440, -424, 444, -1292, 464, -428, 440, -428, 436, -428, 440, -424, 440, -428, 444, -424, 436, -428, 444, -424, 440, -424, 468, -400, 440, -424, 444, -1292, 436, -428, 440, -428, 468, -424, 440, -428, 468, -396, 444, -424, 468, -396, 444, -1288, 440, -1296, 436, -1292, 472, -396, 472, -396, 440, -1292, 440, -424, 444, -424, 440, -428, 436, -428, 444, -424, 464, -428, 440, -428, 440, -424, 440, -428, 440, -424, 472, -396, 440, -424, 440, -428, 440, -1292, 468, -1264, 440, -1292, 440, -1292, 472, -396, 440, -428, 440, -1292, 496, -396, 468, -400, 440, -424, 440, -1292, 440, -1296, 436, -1296, 440, -1292, 440, -424, 444, -424, 440, -424, 444, -424, 440, -428, 440, -424, 440, -428, 440, -424, 440, -428, 468, -1292, 468, -1264, 436, -428, 440, -1296, 440, -424, 440, -1292, 440, -1292, 468, -1264, 444, -424, 468, -1264, 440, -428, 436, -428, 468, -1264, 444, -424, 440, -428, 440, -424, 468, -424, 444, -424, 440, -428, 436, -428, 468, -400, 440, -424, 468, -400, 440, -424, 452, -416, 440, -428, 440, -1292, 440, -1292, 464, -1268, 440, -424, 440, -428, 468, -424, 440, -428, 440, -428, 440, -424, 440, -428, 440, -424, 440, -428, 440, -1292, 468, -1264, 440, -1292, 468, -396, 444, -424, 440, -428, 440, -424, 440, -428, 440, -452, 440, -428, 440, -424, 440, -428, 440, -424, 444, -424, 440, -428, 468, -396, 444, -424, 440, -424, 444, -424, 440, -1292, 440, -428, 440, -424, 468, -1264, 468, -428, 440, -424, 444, -420, 444, -1292, 440, -424, 468, -400, 440, -424, 444, -424, 440, -428, 440, -424, 444, -424, 468, -396, 444, -424, 440, -424, 468, -428, 468, -396, 444, -424, 440, -424, 468, -400, 444, -420, 472, -396, 468, -1264, 440, -1292, 440, -428, 468, -400, 440, -424, 468, -396, 464, -404, 472};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
    irsend.sendRaw(rawCodes, 439, 38);
    Serial.println("Sent the code");
    delay(10000);
}

Thanks

2

Hmmmm. That's a poser alright.

3

unsigned int is set of non-negative number. So you can't have negative numbers in there. You need to change the type to int.

4

arduino_new:
unsigned int is set of non-negative number. So you can't have negative numbers in there. You need to change the type to int.

Ah OK. I gave that a go but the function irsend.sendRaw needs unsigned int:
void IRsend::sendRaw(const unsigned int*, unsigned int, unsigned int)

boolrules:
Hmmmm. That's a poser alright.

Ey?

6

Delta_G:
Maybe you should explain what you think you want to do. The IR library does expect an unsigned integer and for a good reason. What are you hoping to send with the -1?

Thanks Delta-G, OK I'm just trying to do an ordinary infrared read and send. I already read the values and now I'm stuck in sending the codes due to those <0 numbers. the -1 was just an example and not the actual code I'm sending. I included the full sketch in the opening post.

So if the sender only expects positive numbers (and this is a popular library), then did I do the read incorrectly to get negatives? What's going on here!!!

8

Sure I understand that, but as I mentioned several times, -1 was just an example. The raw code that my receiver picked up was many different values alternating between + and -:

{3528, -1696, 440, -428, 440, -1292, 468, -400, 440, -424,.........}

But thanks I have the answer anyway, being that I need find a conversion logic.

Thanks all.

10

OK now I get it the pattern and I literally just found the function to convert to unsigned.

unsigned(myIntValue)

Seems to convert as I expected.

Thanks. :slight_smile: