Comment utiliser 2 appareils SPI, LoRa et carte SD, sur ESP32?

Essayer de coder Heltec ESP32 LoRa avec OLED intégré et avec carte SD attachée.

J'ai fait fonctionner la carte SD (CS 21) et la LoRa (CS 18) individuellement, mais lorsque j'essaie de faire fonctionner les deux dans le même programme, je ne peux pas.

//
// Heltec 32 LoRa OLED (with SD Card)
//               ______________
//          Gnd |    |  USB|   | Gnd
//           5v |    | port|   |  5v
//          3v3 |    |_____|   | 3v3
//          Gnd |      ALL     |  36<-     <- : Input Only!
//           Rx |     GPIO     |  37<-
//           Tx |     3.3v     |  38<-
//          RST |   ________   |  39<-
//            0 |  |        |  |  34<-
//    (SCL)  22 |  |        |  |  35<-
// SPI MISO  19 |  |        |  |  32<-
//           23 |  |        |  |  33<-
//LoRa CS(HI)18 |  |        |  |  25  (LED)
// SPI SCK    5 |  |  OLED  |  |  26  LoRa IRQ
//OLED SCL   15 |  |        |  |  27  SPI MOSI
//            2 |  |        |  |  14  LoRa Rst
//OLED SCA    4 |  |        |  |  12
//           17 |  |________|  |  13
//OLED RST   16 |______________|  21  (SD_CS)
//

#include <mySD.h>        //  SD Card (VMA304)
#include "SSD1306.h"     //  OLED
#include <LoRa.h>        //  LoRa

File root;

//       OLED       Pin
#define  SDA          4   //  Serial Data
#define  SCL         15   //  Serial Clock
#define  oRST        16   //  Reset
#define  OLED_ADDR 0x3C   //  OLED display TWI address

SSD1306         display(OLED_ADDR, SDA, SCL);
//  OLED screen text rows:
#define  row1     0     //  y=0 is top row of size 1 text
#define  row2    10
#define  row3    20
#define  row4    30
#define  row5    40
#define  row6    50     //  row7 at 70 is too low

//  SPI port #2:  SD Card Adapter
#define  SD_CLK      5
#define  SD_MISO    19
#define  SD_MOSI    27
#define  SD_CS      21

//  SPI port:  LoRa (SX1278) 
//       LoRa      Pin
#define  LoRa_SCK    5
#define  LoRa_MISO  19
#define  LoRa_MOSI  27
#define  LoRa_CS    18
#define  LoRa_RST   14    //  LoRa_Reset
#define  DI0        26    //  LoRa_IRQ
#define  BAND    915E6    //  other freq: 433E6  // or ? LoRa f(MHz)

#define  Select    LOW   //  Low CS means that SPI device Selected
#define  DeSelect  HIGH  //  High CS means that SPI device Deselected

File     sessionFile;   //  SD card filenames are restricted to 8 characters + extension

int counter = 0;        //  count sent LoRa messages

/***********************************************************/
void setup(){  
  // set output pins
  pinMode(oRST,OUTPUT);
  pinMode(SD_CS,OUTPUT);
  pinMode(LoRa_CS,OUTPUT);
  digitalWrite(LoRa_CS, DeSelect);

  // set GPIO16 Low then High to Reset OLED
  digitalWrite(oRST, LOW);  
  delay(50);
  digitalWrite(oRST, HIGH);

  Serial.begin(115200);
  while(!Serial);                     //  wait to connect to computer

  display.init();
  display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  display.clear();
  display.display();

  Serial.print("Initializing SD card...");
  digitalWrite(SD_CS, Select);    //  SELECT (Low) SD Card SPI
  if (!SD.begin( SD_CS, SD_MOSI, SD_MISO, SD_CLK )) {
    Serial.println("initialization failed!");
    //  now what?
  } else {
    Serial.println("initialization done.");
    display.drawString( 5,row1,"SD Card OK!" );
    display.display();
    delay(1000);
  }
  /* open "test.txt" for writing */
  root = SD.open("test.txt", FILE_WRITE);
  if (root) {
    root.println("Hello world!");
    root.flush();
    root.close();
  } else {    //  file open error
    Serial.println("error opening test.txt");
  }
  display.drawString( 5,row2,"Wrote in test.txt" );
  display.display();
  delay(100);
  /* after writing, then reopen the file and read it */
  root = SD.open("test.txt");
  if (root) {    /* read from the file to the end of it */
    while (root.available()) {  // read the file
      Serial.write(root.read());
    }
    root.close();
  } else {
    Serial.println("error opening test.txt");
  }
  display.drawString( 5,row3,"Read from test.txt" );
  display.display();
  delay(100);
  //  done testing the SD Card
  digitalWrite(SD_CS, DeSelect);    //  DESELECT (high) SD Card SPI
  SD.end();
  delay( 100 ); 

  //  now test the LoRa

  SPI.begin( LoRa_SCK, LoRa_MISO, LoRa_MOSI, LoRa_CS );

  LoRa.setPins( LoRa_CS, LoRa_RST, DI0 );
  digitalWrite(LoRa_CS, Select);   //  SELECT (low) LoRa SPI 
  Serial.println("LoRa Sender");
  if (!LoRa.begin(BAND)) {
    Serial.println("Starting LoRa failed!");
    display.drawString( 5, row4, "LoRa Init Failed!");
    display.display();
    // now what?
  } else {
    Serial.println("LoRa Initial OK!");
    display.drawString( 5, row4, "LoRa Initialized OK!");
    display.display();
    delay(1000);
  }
  Serial.println("Setup done!");
}

void loop() {
  Serial.print("Sending packet: ");
  Serial.println(counter);
  display.clear();
  display.setFont(ArialMT_Plain_16);
  display.drawString(3, 5, "Sending packet ");
  display.drawString(50, 30, String(counter));
  display.display();
  // send packets
  LoRa.beginPacket();
  LoRa.print("Hi. Sent packet #");
  LoRa.print(counter);
  LoRa.endPacket();
  counter++;
  delay(500);
}

J'ai un récepteur LoRa qui travaille pour lire les messages. Avec le code affiché ci-dessus, la carte SD fonctionne. Et le LoRa dit qu'il transmet des messages, mais le récepteur ne les voit pas, et il s'arrête après 4 messages.