STM32: add SPI flash memory with FAT FS

/*
 *  Manage external SPI Flash with STM32
 *  Write and read a JSON structure like a String,
 *  find first address available
 *  and write and read another JSON structure
 *
 *  with library SPIMemory
 *
 *  by Mischianti Renzo <https://mischianti.org>
 *
 *  https://mischianti.org/
 *
 *	SPIFlash connected via SPI standard
 *
 */

#include <SPI.h>
#include <SPIMemory.h>
#include <ArduinoJson.h>

//SPIFlash flash; // If you don't specify the library use standard SPI connection
SPIFlash flash(SS);
void setup() {
  Serial.begin(115200);

  while (!Serial) ; // Wait for Serial monitor to open
  delay(100);

  flash.begin(); // If SPIMemory isn't recognized you can specify the size of memory

  // flash.eraseChip();

  Serial.print(F("Flash size: "));
  Serial.print((long)(flash.getCapacity()/1000));
  Serial.println(F("Kb"));

  unsigned long strAddr = 0;
  unsigned long strAddrSecondString = 0;

  Serial.println();

  // Allocate a temporary JsonDocument
  // Don't forget to change the capacity to match your requirements.
  // Use arduinojson.org/v6/assistant to compute the capacity.
  //  StaticJsonDocument<512> doc;
  // You can use DynamicJsonDocument as well
  Serial.println(F("Generate JSON file!"));
  DynamicJsonDocument doc(512);

  // Set the values in the document
  doc["energyLifetime"] = 21698620;
  doc["energyYearly"] = 1363005;

  Serial.print(F("Put data in a buffer.. "));
  // Serialize JSON to file
  String buf;
  if (serializeJson(doc, buf) == 0) {
	  Serial.println(F("failed to write buffer"));
  }

  if (flash.writeStr(strAddr, buf)){
	  Serial.print(F("OK, writed on address "));
	  Serial.println(strAddr);
  }else{
	  Serial.println(F("KO"));
  }

  String outputString = "";
  if (flash.readStr(strAddr, outputString)) {
    Serial.print(F("Read json: "));
    Serial.println(outputString);
    Serial.print(F("From address: "));
    Serial.println(strAddr);
  }


  Serial.println(F("Generate JSON file!"));
  DynamicJsonDocument doc2(512);

  // Set the values in the document
  doc2["energyLifetime"] = 222;
  doc2["energyYearly"] = 333;


  Serial.println();
  Serial.print(F("Check first free sector: "));
  strAddrSecondString = flash.getAddress(doc2.size());
  Serial.println(strAddrSecondString);
  Serial.println();

  Serial.print(F("Stream data in flash memory!"));

  Serial.print(F("Put data in a buffer.."));
  // Serialize JSON to file
  String buf2;
  if (serializeJson(doc2, buf2) == 0) {
	  Serial.println(F("failed to write buffer"));
  }
    // Print test file

  if (flash.writeStr(strAddrSecondString, buf2)){
	  Serial.print(F("OK, writed on address "));
	  Serial.println(strAddrSecondString);
  }else{
	  Serial.println(F("KO"));
  }

  String outputString2 = "";
  if (flash.readStr(strAddrSecondString, outputString2)) {
    Serial.print(F("Read data: "));
    Serial.println(outputString2);
    Serial.print(F("From address: "));
    Serial.println(strAddrSecondString);
  }

  while (!flash.eraseSector(strAddr));
  while (!flash.eraseSector(strAddrSecondString));

}

void loop() {

}

Flash size: 8388Kb

Generate JSON file!
Put data in a buffer.. OK, writed on address 0
Read json: {"energyLifetime":21698620,"energyYearly":1363005}
From address: 0
Generate JSON file!

Check first free sector: 56

Stream data in flash memory!Put data in a buffer..OK, writed on address 56
Read data: {"energyLifetime":222,"energyYearly":333}
From address: 56

/*
 *  Retrieve basic core info of Flash SPI
 *  Add a custom device w25x80
 *  library Adafruit_SPIFlash and SdFat - AdafruitFork
 *
 *  by Mischianti Renzo <https://mischianti.org>
 *
 *  https://mischianti.org/
 *
 *	SPIFlash connected via SPI standard check wiring on the article
 *
 */

#include "SdFat.h"
#include "Adafruit_SPIFlash.h"

Adafruit_FlashTransport_SPI flashTransport(SS, SPI); // Set CS and SPI interface
Adafruit_SPIFlash flash(&flashTransport);

void setup()
{
  Serial.begin(115200);
  while ( !Serial ) delay(100);   // wait for native usb

  if (flash.begin()) {
	  Serial.println(F("Device finded and supported!"));
  } else {
	  Serial.println(F("Problem to discover and configure device, check wiring also!"));
  }
  // Set 4Mhz SPI speed
  flashTransport.setClockSpeed(4000000, 4000000); // added to prevent speed problem

  Serial.println();

  Serial.println("Adafruit Serial Flash get basic info: ");
  Serial.print("JEDEC ID (FFFFFF for unknown): "); Serial.println(flash.getJEDECID(), HEX);
  Serial.print("Flash size: "); Serial.println(flash.size());

  Serial.println();Serial.println();

  uint8_t jedec_ids[4];
  flashTransport.readCommand(SFLASH_CMD_READ_JEDEC_ID, jedec_ids, 4);

  // For simplicity with commonly used device, we only check for continuation
  // code at 2nd byte (e.g Fujitsu FRAM devices)
  if (jedec_ids[1] == 0x7F) {
    // Shift and skip continuation code in 2nd byte
    jedec_ids[1] = jedec_ids[2];
    jedec_ids[2] = jedec_ids[3];
  }

  Serial.println("Retrieve JDEC_ID");

  Serial.print("Manufacturer ID: 0x");
  Serial.println(jedec_ids[0], HEX);

  Serial.print("Memory Type: 0x");
  Serial.println(jedec_ids[1], HEX);

  Serial.print("Capacity: 0x");
  Serial.println(jedec_ids[2], HEX);
  Serial.print("Capacity DEC: ");
  Serial.println(jedec_ids[2], DEC);
}

void loop()
{
  // nothing to do
}

Unknown flash device 0xEF4014
Problem to discover and configure device, check wiring also!

Adafruit Serial Flash get basic info: 
JEDEC ID (FFFFFF for unknown): FFFFFF