ラズピコでSPI Flashの読み書き

利用するフラッシュメモリ

16MB QSPI/SPIフラッシュメモリブレークアウト基板（W25Q128JV）

128 MbitのQSPI/SPI接続シリアルフラッシュメモリであるW25Q128JVSSIQを使いやすい300 mil幅DIP-8形状に変換したブレークアウト基板です。

チップ

W25Q128JVSSIQ

データシート

チュートリアル

ピン配置

1: CS

2: IO1 (MISO)

3: IO2（Write Protect Input ... Active Low）

4: GND

5: 3.3V

6: IO3: (Hold Input ... Allows the device to be paused while it is actively selected)

7: CLK

8: IO0 (MOSI)

https://gyazo.com/1ba15cf4659e8160560b27e6ce6fc51b

ラズピコのピン

PICO_DEFAULT_SPI_SCK_PIN 18 → CLK(7ピン)へ

PICO_DEFAULT_SPI_TX_PIN 19 → IO0/MOSI(8ピン)へ

PICO_DEFAULT_SPI_RX_PIN 16 → IO1/MISO(2ピン)へ

PICO_DEFAULT_SPI_CSN_PIN 17 → CS(1ピン)へ

（IO2はLOWにすると書き込み制限されそうなので、HIGHにしておくと良さそう）

(IO3は...LOWでもいいかな...）

code:c

// --- SPI ---

https://gyazo.com/2eda35e7caafea77d8e8ad1b39bf7cf8

https://gyazo.com/8094a71edb8be2b136f605fbfcb94403

PICO_DEFAULT_SPI_SCK_PIN 18 → CLK(7ピン)へ

PICO_DEFAULT_SPI_TX_PIN 19 → IO0/MOSI(8ピン)へ

PICO_DEFAULT_SPI_RX_PIN 16 → IO1/MISO(2ピン)へ

PICO_DEFAULT_SPI_CSN_PIN 17 → CS(1ピン)へ

（IO2はLOWにすると書き込み制限されそうなので、HIGHにしておくと良さそう）

(IO3は...LOWでもいいかな...）

PlatformIOへライブラリを追加

code:diff

diff --git a/platformio.ini b/platformio.ini

index 824ceec..7f402b2 100644

--- a/platformio.ini

+++ b/platformio.ini

@@ -9,6 +9,9 @@

board = pico

framework = arduino

board_build.core = earlephilhower

+lib_deps =

+ adafruit/Adafruit SPIFlash@^4.2.1

以下のソースを良さげな場所に配置。

オリジナルは以下にあります

code:flash_config.h

/*

* The MIT License (MIT)

*

* Copyright (c) 2022 Ha Thach (tinyusb.org) for Adafruit Industries

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

*/

// Un-comment to run example with custom SPI and SS e.g with FRAM breakout

Adafruit_FlashTransport_SPI flashTransport(CUSTOM_CS, CUSTOM_SPI);

// ESP32 use same flash device that store code for file system.

// SPIFlash will parse partition.cvs to detect FATFS partition to use

Adafruit_FlashTransport_ESP32 flashTransport;

// RP2040 use same flash device that store code for file system. Therefore we

// only need to specify start address and size (no need SPI or SS)

// By default (start=0, size=0), values that match file system setting in

// 'Tools->Flash Size' menu selection will be used.

Adafruit_FlashTransport_RP2040 flashTransport;

// To be compatible with CircuitPython partition scheme (start_address = 1 MB,

// size = total flash - 1 MB) use const value (CPY_START_ADDR, CPY_SIZE) or

// subclass Adafruit_FlashTransport_RP2040_CPY. Un-comment either of the

// following line:

// Adafruit_FlashTransport_RP2040

// flashTransport(Adafruit_FlashTransport_RP2040::CPY_START_ADDR,

// Adafruit_FlashTransport_RP2040::CPY_SIZE);

// Adafruit_FlashTransport_RP2040_CPY flashTransport;

// On-board external flash (QSPI or SPI) macros should already

// defined in your board variant if supported

// - EXTERNAL_FLASH_USE_QSPI

// - EXTERNAL_FLASH_USE_CS/EXTERNAL_FLASH_USE_SPI

Adafruit_FlashTransport_QSPI flashTransport;

Adafruit_FlashTransport_SPI flashTransport(EXTERNAL_FLASH_USE_CS,

EXTERNAL_FLASH_USE_SPI);

// Use stand SPI/SS for avr port.

// Note cache will be disable due to lack of memory.

Adafruit_FlashTransport_SPI flashTransport(SS, SPI);

code:main.cpp

/*

SD card read/write

This example shows how to read and write data to and from an SD card file

The circuit:

* SD card attached to SPI bus as follows:

** MOSI - pin 11

** MISO - pin 12

** CLK - pin 13

created Nov 2010

by David A. Mellis

modified 9 Apr 2012

by Tom Igoe

This example code is in the public domain.

*/

// for flashTransport definition

Adafruit_SPIFlash flash(&flashTransport);

// file system object from SdFat

FatVolume fatfs;

File32 myFile;

void setup() {

// Open serial communications and wait for port to open:

Serial.begin(115200);

while (!Serial) {

delay(

10); // wait for serial port to connect. Needed for native USB port only

}

Serial.println("Initializing Filesystem on external flash...");

// Init external flash

flash.begin();

// Open file system on the flash

if (!fatfs.begin(&flash)) {

Serial.println("Error: filesystem is not existed. Please try SdFat_format "

"example to make one.");

while (1) {

yield();

delay(1);

}

}

Serial.println("initialization done.");

// open the file. note that only one file can be open at a time,

// so you have to close this one before opening another.

myFile = fatfs.open("test.txt", FILE_WRITE);

// if the file opened okay, write to it:

if (myFile) {

Serial.print("Writing to test.txt...");

myFile.println("testing 1, 2, 3.");

// close the file:

myFile.close();

Serial.println("done.");

} else {

// if the file didn't open, print an error:

Serial.println("error opening test.txt");

}

// re-open the file for reading:

myFile = fatfs.open("test.txt");

if (myFile) {

Serial.println("test.txt:");

// read from the file until there's nothing else in it:

while (myFile.available()) {

Serial.write(myFile.read());

}

// close the file:

myFile.close();

} else {

// if the file didn't open, print an error:

Serial.println("error opening test.txt");

}

}

void loop() {

// nothing happens after setup

}

動かないのはこれが原因かもしれない

再チャレンジ

SPIのピンを以下のように指定して、

code:diff

void setup() {

SPI.setRX(0);

SPI.setCS(1);

SPI.setSCK(2);

SPI.setTX(3);

以下のように配線した

1ピン配置

1: CS

2: IO1 (MISO)

3: IO2（Write Protect Input ... Active Low）

4: GND

5: 3.3V

6: IO3: (Hold Input ... Allows the device to be paused while it is actively selected)

7: CLK

8: IO0 (MOSI)

https://gyazo.com/1ba15cf4659e8160560b27e6ce6fc51b

うまく信号を送れていないような...