seeed studio xiao nrf52840 eeprom

Community General Info - Guidance
6

A couple questions

  • What are you needing to write to the flash (config file, data, etc)?
  • Are you writing to the on chip 1MB flash or the onboard 2MB flash?

I ask because I feel we may be trying to do similar things. I’m trying to write a config file to the external 2MB flash chip


@PJ_Glasso had a very helpful response in my thread below on getting started with writing to the external flash.



Here’s some adapted code sourced from the post below (one that he linked me)

Code:

// Author: cam
#include <Arduino.h>
#include <SPI.h>
#include <Wire.h>
#include <SdFat.h>
#include <Adafruit_SPIFlash.h>
#include <LSM6DS3.h>

// Flash Chip declerations, made up from Data Sheets.
// https://files.seeedstudio.com/wiki/github_weiruanexample/Flash_P25Q16H-UXH-IR_Datasheet.pdf
SPIFlash_Device_t const p25q16h{
.total_size = (1UL << 21), // 2MiB
.start_up_time_us = 10000,
.manufacturer_id = 0x85,
.memory_type = 0x60,
.capacity = 0x15,
.max_clock_speed_mhz = 55,
.quad_enable_bit_mask = 0x02,
.has_sector_protection = 1,
.supports_fast_read = 1,
.supports_qspi = 1,
.supports_qspi_writes = 1,
.write_status_register_split = 1,
.single_status_byte = 0,
.is_fram = 0,
};

//Create a instance of class LSM6DS3
LSM6DS3 myIMU(I2C_MODE, 0x6A);
#define int2Pin PIN_LSM6DS3TR_C_INT1

#define SS_SPI1 25 // Defaul SS or CS for the Onboard QSPI Flash Chip

SPIClass SPI_2(NRF_SPIM0, PIN_QSPI_IO1, PIN_QSPI_SCK, PIN_QSPI_IO0); // Onboard QSPI Flash chip
Adafruit_FlashTransport_SPI QflashTransport(PIN_QSPI_CS, SPI_2); // CS for QSPI Flash
Adafruit_SPIFlash Qflash(&QflashTransport);

void setup() {
Serial.begin(9600);
while (!Serial) {
delay(100); // waits for serial
}
Serial.println(“Starting up”);

if (!Qflash.begin(&p25q16h, 1)) {
Serial.println(F(“Error, failed to initialize QSPI flash chip!”));
while (1)
;
}
Serial.println(Qflash.getJEDECID(), HEX);

Serial.print(Qflash.size() / 1024);
Serial.println(F(" KB"));

Serial.println(Qflash.read8(0x000500));
Serial.print("page size ");
Serial.println(Qflash.pageSize());
Serial.print("num page ");
Serial.println(Qflash.numPages());
Serial.print("sector count ");
Serial.print(Qflash.sectorCount());
}

/*

0x1FF000:

read8
Starting up
856015
2048 KB
255

read16
Starting up
856015
2048 KB
65535

read32
Starting up
856015
2048 KB
4294967295

*/
void loop() {
}



Additionally, there are some ways to create a file system on the board using littlefs, but I haven’t gotten anything working yet as I need to find a solution that doesn’t use mbed os.

If there are any parallels between our projects let me know and we can look for a solution together!