Using 2 SPI ports on ESP32 ?

[SrikanthBala]

Hardware:

Board: ESP32 Dev Kit
Core Installation/update date: Feb 2018
IDE name: Arduino IDE
Flash Frequency: 40Mhz
Upload Speed: 115200?

Description:

I am using a SD card to store values from a RFID reader RC522.
Both use the SPI bus, and are known to have compatibility issues. I have connected them together using a different CS only and all other pins being same and when I remove power of SD card module, RC522 works well and when I remove MOSI of RC522 SD card works. (Arduino forum has said somewhere the issue is with the old SD card modules)

So i wanted to use the second SPI. I saw this issue #790 but am still not sure how to use it. Could anyone help me ?
What pins do I use for HSPI ? or are they reconfigureable. A simple general example would be great.

[lbernstone]

I don't have a full example for you, but here's some tips. The pinmap is on the front page of the arduino-esp32 project (https://github.com/espressif/arduino-esp32#esp32dev-board-pinmap). You can remap SPI pins to (almost) whatever you want, but you might as well use the well tested defaults. Initialize the SPI with:
SPIClass spiRFID(HSPI);
Then in your setup call:
spiRFID.begin(14,12,13,15); //CLK,MISO,MOIS,SS

Then you should be able to use spiRFID in your library instead of SPI.

[SrikanthBala]

Got the RC522 to work on HSPI with a few mods to the library !! Now SD card and RC522 both working together. Thanks a million Ibernstone !

I'm not sure I did everything according to convention though. I defined SPIClass spiRFID(HSPI) in the MRFC522 library MRFC522.cpp file. I changed all 'SPI.xxx' references to 'spiRFID.xxx'. I then defined the same as 'extern SPIClass spiRFID ;' in my main sketch and put spiRFID(14,12,13,15); in the setup of the main Sketch.
If I didn't define extern SPIClass spiRFID in my sketch spiRFID(14,12,13,15) would flag an error.

So was this how it was supposed to be done ?

Thanks

[lbernstone]

If it works, then it works. The correct way to do it is to make it so the library can accept an SPIClass object in its initialization which defaults to SPI. Take a look at the SD library to see how they do it there. That could then be given back to the library maintainer so the next guy doesn't have to muck about as much. Please close the issue.

[SrikanthBala]

Ok. Will do. Thanks again.

[donim4rt]

hi @SrikanthBala may you post the code i think i'm confused whether the SD library, SPI libarary or MFRC library need to modified. thank you

[fa1ke5]

This code work great, no modification SD or SPI lbr
#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;
}
}
void loop() {
}

[mellowmonk]

@SrikanthBala
Please share the sketch that worked too. Thanks.

[froussel]

Hi, Happy new year
I want connect ggto-t-display (use 19, 18, 5, 16, 23, 4 for SPI display ST7789V) and a SD card.
How ?
Thanks

[fa1ke5]

connect sd card using display SPI and use another CS pin, whats a problem?

[froussel]

connect sd card using display SPI and use another CS pin, whats a problem?

The pins of thedisplay are not accessible and even if it was the case it was impossible to make a link screen then sd then screen etc... without redoing a .begin each time or so I have to explain
Excuse me i am a beginner