Bonjour
Pour avoir beaucoups cherché une solution fiable d'une com de nextion vers arduino
je me permet de vous donner les infos qui m'on permis de réussir.
le nextion ne peut envoyer que du .txt, c'est dommage mais c'est comme cela.
Les exemples de bouts de prog que je donne, proviennent de
PerryBebbington sur le forum anglais
https://forum.arduino.cc/index.php?topic=604185.0
Merci a lui.
Coté Nextion
printh a5 //Start
printh a5 //Start
printh a5 //Start
printh 02 //N° page /data 01
print va100.txt // pour qui? //data 02
print va97.txt //valeur a transmettre // 4 datas
Coté arduino
//==============================================Reception données de Nextion =======================================
// 3X A5 N° de page 1 Caractère (qui envoi) 4 caractères de données ex: 19.6 ou 4444
void HMI_read() {
static uint8_t HMI_read_data[10]; //This is a temporary buffer to hold the data from the display. Space for 10 bytes although this demonstration only uses 6 bytes
static uint8_t HMI_read_data_i; //This is a count of how many bytes have been received from the display.
static uint8_t a5count; //0xa5 repeated 3 times is used as a start indicator, this is a count of how many times it has been received.
uint8_t readreceptnextion; //This is to hold the last received byte to ensure that it is only read from the receive buffer once.
while (Serial2.available() > 0) { //Read every byte in the receive buffer
readreceptnextion = Serial2.read();
if (readreceptnextion == 0xa5) { //Count the number of times 0xa5 has been received
++a5count; // caracteres de demarrage de message
if (a5count > 2) {
a5count = 0;
HMI_read_data_i = 0;
}
}
else {
a5count = 0;
}
// =========================================== fin de reception des caractères de demarrage ================================================
// Lecture des datas
HMI_read_data[HMI_read_data_i] = readreceptnextion;
if (HMI_read_data_i == 6) {
text[1] = (HMI_read_data[1]);
text[2] = (HMI_read_data[2]);
text[3] = (HMI_read_data[3]);
text[4] = (HMI_read_data[4]);
text[5] = (HMI_read_data[5]);
text[6] = (HMI_read_data[6]);
numpage = text[1];
quichar = (text[2]);
recup[1] = text[3];//1er caractere ex:1
recup[2] = text[4];//2eme caractere ex:9
recup[3] = text[5];//3eme caractere ex: .
recup[4] = text[6];//4eme caractere ex 6 =19.6
valeur = atof(recup);
}
++HMI_read_data_i;
if (HMI_read_data_i > 9) {
HMI_read_data_i = 9;
}
}
}
