M5 Stamp PicoとSDカードモジュールをつなげて通信する方法の備忘録です。
用意するもの
・M5 Stamp Pico
・ESP32 Downloader（Stamp Picoへの書き込み用）
・SDカードモジュール：https://amzn.to/3xkHRXg
接続方法
| M5 Stamp Pico | SDカードモジュール ()はモジュール以外を使うとき |
| 3V3 | 3V3 (VDD) |
| IO19(CS) | CS (CD/DAT3を10Kで3.3Vにプルアップ) |
| IO25 (MOSI) | MOSI (CMDを10Kで3.3Vにプルアップ) |
| IO18 (SCK) | CLK (CLKを10Kで3.3Vにプルアップ) |
| IO36 (MISO) | MISO (DAT0を10Kで3.3Vにプルアップ) |
| GND | GND (VSS) |
プログラム
SDライブラリのSD_Testを使うのですが、そのままでは使えないので一部変更します。内容としてはSPIをデフォルトからM5 Stamp Picoのピン配置に変更します。（プログラム内のコメントで記載）
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/* * Connect the SD card to the following pins: * * SD Card | ESP32 * D3/CS CS/19 * CMD/MOSI MOSI/26 * VSS GND * VDD 3.3V * CLK SCK/18 * D0/MISO MISO/36 */ #include "FS.h" #include "SD.h" #include "SPI.h" //M5Stamp用に追加（SPIの変更） #define sd_ss 19 #define sd_mosi 26 #define sd_miso 36 #define sd_sck 18 void listDir(fs::FS &fs, const char * dirname, uint8_t levels){ Serial.printf("Listing directory: %s\n", dirname); File root = fs.open(dirname); if(!root){ Serial.println("Failed to open directory"); return; } if(!root.isDirectory()){ Serial.println("Not a directory"); return; } File file = root.openNextFile(); while(file){ if(file.isDirectory()){ Serial.print(" DIR : "); Serial.println(file.name()); if(levels){ listDir(fs, file.path(), levels -1); } } else { Serial.print(" FILE: "); Serial.print(file.name()); Serial.print(" SIZE: "); Serial.println(file.size()); } file = root.openNextFile(); } } void createDir(fs::FS &fs, const char * path){ Serial.printf("Creating Dir: %s\n", path); if(fs.mkdir(path)){ Serial.println("Dir created"); } else { Serial.println("mkdir failed"); } } void removeDir(fs::FS &fs, const char * path){ Serial.printf("Removing Dir: %s\n", path); if(fs.rmdir(path)){ Serial.println("Dir removed"); } else { Serial.println("rmdir failed"); } } void readFile(fs::FS &fs, const char * path){ Serial.printf("Reading file: %s\n", path); File file = fs.open(path); if(!file){ Serial.println("Failed to open file for reading"); return; } Serial.print("Read from file: "); while(file.available()){ Serial.write(file.read()); } file.close(); } void writeFile(fs::FS &fs, const char * path, const char * message){ Serial.printf("Writing file: %s\n", path); File file = fs.open(path, FILE_WRITE); if(!file){ Serial.println("Failed to open file for writing"); return; } if(file.print(message)){ Serial.println("File written"); } else { Serial.println("Write failed"); } file.close(); } void appendFile(fs::FS &fs, const char * path, const char * message){ Serial.printf("Appending to file: %s\n", path); File file = fs.open(path, FILE_APPEND); if(!file){ Serial.println("Failed to open file for appending"); return; } if(file.print(message)){ Serial.println("Message appended"); } else { Serial.println("Append failed"); } file.close(); } void renameFile(fs::FS &fs, const char * path1, const char * path2){ Serial.printf("Renaming file %s to %s\n", path1, path2); if (fs.rename(path1, path2)) { Serial.println("File renamed"); } else { Serial.println("Rename failed"); } } void deleteFile(fs::FS &fs, const char * path){ Serial.printf("Deleting file: %s\n", path); if(fs.remove(path)){ Serial.println("File deleted"); } else { Serial.println("Delete failed"); } } void testFileIO(fs::FS &fs, const char * path){ File file = fs.open(path); static uint8_t buf[512]; size_t len = 0; uint32_t start = millis(); uint32_t end = start; if(file){ len = file.size(); size_t flen = len; start = millis(); while(len){ size_t toRead = len; if(toRead > 512){ toRead = 512; } file.read(buf, toRead); len -= toRead; } end = millis() - start; Serial.printf("%u bytes read for %u ms\n", flen, end); file.close(); } else { Serial.println("Failed to open file for reading"); } file = fs.open(path, FILE_WRITE); if(!file){ Serial.println("Failed to open file for writing"); return; } size_t i; start = millis(); for(i=0; i<2048; i++){ file.write(buf, 512); } end = millis() - start; Serial.printf("%u bytes written for %u ms\n", 2048 * 512, end); file.close(); } void setup(){ Serial.begin(115200); //M5Stamp用に追加（SPIの変更） SPI.end(); SPI.begin( sd_sck, sd_miso, sd_mosi, sd_ss ); //if(!SD.begin()){ if(!SD.begin( sd_ss, SPI )){ //M5Stamp用に記載を変更（SPIの変更） Serial.println("Card Mount Failed"); return; } uint8_t cardType = SD.cardType(); if(cardType == CARD_NONE){ Serial.println("No SD card attached"); return; } Serial.print("SD Card Type: "); if(cardType == CARD_MMC){ Serial.println("MMC"); } else if(cardType == CARD_SD){ Serial.println("SDSC"); } else if(cardType == CARD_SDHC){ Serial.println("SDHC"); } else { Serial.println("UNKNOWN"); } uint64_t cardSize = SD.cardSize() / (1024 * 1024); Serial.printf("SD Card Size: %lluMB\n", cardSize); listDir(SD, "/", 0); createDir(SD, "/mydir"); listDir(SD, "/", 0); removeDir(SD, "/mydir"); listDir(SD, "/", 2); writeFile(SD, "/hello.txt", "Hello "); appendFile(SD, "/hello.txt", "World!\n"); readFile(SD, "/hello.txt"); deleteFile(SD, "/foo.txt"); renameFile(SD, "/hello.txt", "/foo.txt"); readFile(SD, "/foo.txt"); testFileIO(SD, "/test.txt"); Serial.printf("Total space: %lluMB\n", SD.totalBytes() / (1024 * 1024)); Serial.printf("Used space: %lluMB\n", SD.usedBytes() / (1024 * 1024)); } void loop(){ } |
プログラムを書き込んでシリアルモニタに読み書きが成功した旨のメッセージが出ていれば成功です。
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