Fonctionnement de la classe Serial sur de gros codes

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1

Bonjour,

Depuis quelques temps, je suis confronté à un problème :

Le code suivant fonctionne (ie. la led s'allume) (ok, il est relativement inutile, mais bon...) :

void setup()
{
 Serial.begin(115200, SERIAL_8N1);
 pinMode(13, OUTPUT);
 digitalWrite(13, HIGH); 
}
void loop()
{
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
}

mais le code suivant ne fonctionne pas (ie. la led ne s'allume pas) :

void setup()
{
 Serial.begin(115200, SERIAL_8N1);
 pinMode(13, OUTPUT);
 digitalWrite(13, HIGH); 
}
void loop()
{
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
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  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
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  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
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  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
  makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);makeWord(1);
}

Visiblement, le problème apparaît lorsque la taille du programme dépasse 4500 octets (à peu près).

Pour la compréhension du code, makeWord est définie dans WMath.cpp de la manière suivante :

unsigned int makeWord(unsigned int w) { return w; }

J'utilise cette fonction pour faire grossir la taille du code artificiellement (l'option -0s étant utilisée lors de la compilation) sans utiliser d'E/S ni de cli ou d'autres trucs dans le genre pouvant fausser l'interprétation des résultats.

Je ne vois pas d'autres explications possible qu'un bug, mais j'ai un peu de mal à le localiser (j'ai l'impression que ça vient des ISR, mais ça reste à prouver).

Le problème apparaît aussi lors de l'utilisation de la lib twi.c.

Avez-vous des idées de son origine ? J'utilise arduino 1.0.5...

Merci d'avance !

2

johwn:
Bonjour,

Depuis quelques temps, je suis confronté à un problème :

Le code suivant fonctionne (ie. la led s'allume) (ok, il est relativement inutile, mais bon...) :

...
mais le code suivant ne fonctionne pas (ie. la led ne s'allume pas) :

Avez-vous des idées de son origine ? J'utilise arduino 1.0.5...

Merci d'avance !

Bonjour
"Chez moi" elle s'allume
UNO R2
IDE 1.0.5 r2
Taille binaire du croquis : 6 246 octets (d'un max de 32 256 octets)

3

J'ai oublié de préciser, il s'agit d'une arduino uno r3, mais je sais pas si ça change grand chose...

4

Salut,

Vu que dans le titre tu nous parles de Serial, ça veut dire que dans le cas où ça ne marche pas, si tu vire le Serial.begin() ça marche ?

5

Oui... Je trouve ça assez étrange...

6

Le code fonctionne chez moi : Uno R3, IDE 1.0.5, Mac X OS 10.7

Il fonctionne également avec l'IDE 1.5.6-r2