92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
/**
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* @file sdmmc-test.ino
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* @brief MicroSD card test for the Guition ESP32-S3 4.3" 480x272 display,
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* accessed over SD_MMC (1-bit mode) - confirmed working on real hardware
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* (2026-08-19). See sd-test.ino in the sibling folder for the same card,
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* same physical pins, accessed over plain SPI instead - SD cards support
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* both interfaces on the same 4 pins (CLK, CMD/MOSI, DAT0/MISO, DAT3/CS),
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* which is also why the pins below were originally given in SPI
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* terminology even though this file uses SD_MMC. DAT3 (labelled "CS" by
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* the user, GPIO10) isn't one of the pins ESP32-S3's SD_MMC.setPins(clk,
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* cmd, d0) 1-bit overload manages, and driving it manually (either level)
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* was confirmed to make no difference on real hardware - so it's left
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* unconnected/unmanaged here.
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*
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* Writes a small test file, reads it back, and lists the card's root
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* directory.
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*
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* @author Phil Schatzmann
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* @copyright GPLv3
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*/
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#include <FS.h>
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#include <SD_MMC.h>
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// Confirmed working on real hardware, 2026-08-19.
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constexpr int kPinSdClk = 12;
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constexpr int kPinSdCmd = 11;
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constexpr int kPinSdD0 = 13;
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const char* testFile = "/audiotools_sdmmc_test.txt";
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const char* testContent = "arduino-audio-tools sdmmc-test\n";
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void listDir(const char* path) {
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File root = SD_MMC.open(path);
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File entry;
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while ((entry = root.openNextFile())) {
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Serial.printf(" %s%s (%u bytes)\n", path, entry.name(), entry.size());
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entry.close();
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}
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}
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bool writeReadTest() {
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File f = SD_MMC.open(testFile, FILE_WRITE);
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if (!f) {
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Serial.println("open for write failed");
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return false;
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}
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f.print(testContent);
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f.close();
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f = SD_MMC.open(testFile, FILE_READ);
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if (!f) {
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Serial.println("open for read failed");
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return false;
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}
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String readBack = f.readString();
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f.close();
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Serial.printf("read back: %s", readBack.c_str());
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return readBack == testContent;
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}
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void setup() {
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Serial.begin(115200);
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while (!Serial) delay(10);
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Serial.println("starting SD_MMC...");
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if (!SD_MMC.setPins(kPinSdClk, kPinSdCmd, kPinSdD0)) {
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Serial.println("SD_MMC.setPins() failed");
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return;
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}
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if (!SD_MMC.begin("/sdcard", true)) {
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Serial.println("SD_MMC.begin() failed - check card is inserted");
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return;
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}
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uint8_t cardType = SD_MMC.cardType();
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if (cardType == CARD_NONE) {
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Serial.println("no SD card found");
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return;
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}
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Serial.printf("card type: %d, size: %llu MB\n", cardType,
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SD_MMC.cardSize() / (1024 * 1024));
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Serial.println(writeReadTest() ? "write/read test: OK"
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: "write/read test: FAILED");
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Serial.println("root directory:");
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listDir("/");
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}
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void loop() {}
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