TTGO Lora32 V2 with 2 SPI

This is a very well made board, but as most of the boards from china, the document is always a pain...

This board has Lora and SD slot, both are on different SPI...yes, esp32 has 2 SPIs.

But arduino has SPI for one, the pins are defined in the HAL, so most libraries in arduino use the only one SPI.

TTGO lora32 has SPI pins:
        MISO   MOSI   SCK     CS
SD    IO02    IO15     IO14    IO13
Lora IO19     IO27     IO05    IO18

According to:https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/peripherals/spi_master.html
there are 4 SPIs on esp32, SPI0 and SPI1 are used for internal flash.
HSPI/VSPI has 3 CS line each, to drive 3 devices each.

TTGO does provide a lora example:https://github.com/LilyGO/TTGO-LORA32-V2.0

but TTGO does not provide the example on SD for LoraV2 board. but here: https://github.com/LilyGO/TTGO-SD-test/blob/master/ESP32__goodSD/ESP32__goodSD.ino


There is an example from Espressif about using 2SPI, HSPI/VSPI
https://github.com/espressif/arduino-esp32/blob/master/libraries/SPI/examples/SPI_Multiple_Buses/SPI_Multiple_Buses.ino

In the gihub of TTGO lora 32 V2, there is an closed issue using redefined SPI:

#include "FS.h"
#include "SD.h"
#include "SPI.h"
SPIClass spiSD(HSPI);
#define SD_CS 13
#define SDSPEED 27000000
void setup(){
Serial.begin(115200);
spiSD.begin(14,2,15,13);//SCK,MISO,MOSI,ss // инициализируем HSPI1
if(!SD.begin( SD_CS, spiSD, SDSPEED)){
// if(!SD.begin()){
Serial.println("Card Mount Failed");
return;
}

Combine the above 2 source, I tested with following, and it shows no error:

#include "FS.h"
#include "SD.h"
#include "SPI.h"
#include <LoRa.h>
SPIClass spiSD(HSPI);
#define SD_CS 13
#define SDSPEED 27000000

SPIClass spiLora(VSPI);
#define SCK     5    // GPIO5  -- SX1278's SCK
#define MISO    19   // GPIO19 -- SX1278's MISnO
#define MOSI    27   // GPIO27 -- SX1278's MOSI
#define SS      18   // GPIO18 -- SX1278's CS
#define RST     14   // GPIO14 -- SX1278's RESET
#define DI0     26   // GPIO26 -- SX1278's IRQ(Interrupt Request)
#define BAND  915E6


void setup() {
  Serial.begin(115200);
  //-------SD---------------------------
  spiSD.begin(14, 2, 15, 13); //SCK,MISO,MOSI,ss // инициализируем HSPI1
  if (!SD.begin( SD_CS, spiSD, SDSPEED)) {
    // if(!SD.begin()){
    Serial.println("Card Mount Failed");
    return;
  }
//------------lora-----------------------
  spiLora.begin(SCK,MISO,MOSI,SS);
  LoRa.setPins(SS,RST,DI0);
  if (!LoRa.begin(BAND)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
  //LoRa.onReceive(cbk);
//  LoRa.receive();
  Serial.println(" lora init ok");


}// end of setup
void loop() {
}

But when uploading the code, if I keep the sd card in the slot, it has a good chance that the code does not upload. and arduino IDE shows can't connect to esp32.
Once you remove the SD card, it seems fine. My guess is that Pin IO02 is used for internal flash writing....(according to what I found in internet)

I have also test it: first send data then write into sdcard, it works just fine.