16d9609ac9
* Add VFS to enable POSIX file I/O operations Enables use of FILE * operations on internal and external storage. fopen, fclose, fseek, fprintf, fscanf, etc. supported. * Add FS/File::stat and support POSIX stat/fstat
114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
// Released to the piublic domain by Earle F. Philhower, III in 2024
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#include <LittleFS.h>
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#include <VFS.h>
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#include <SPI.h>
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#include <SDFS.h>
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// This are GP pins for SPI0 on the Raspberry Pi Pico board, and connect
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// to different *board* level pinouts. Check the PCB while wiring.
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// Only certain pins can be used by the SPI hardware, so if you change
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// these be sure they are legal or the program will crash.
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// See: https://datasheets.raspberrypi.com/picow/PicoW-A4-Pinout.pdf
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const int _MISO = 4; // AKA SPI RX
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const int _MOSI = 7; // AKA SPI TX
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const int _CS = 5;
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const int _SCK = 6;
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// SPI1
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//const int _MISO = 8; // AKA SPI RX
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//const int _MOSI = 11; // AKA SPI TX
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//const int _CS = 9;
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//const int _SCK = 10;
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void setup() {
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delay(5000);
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if (!LittleFS.begin()) {
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Serial.printf("ERROR: Unable to start LittleFS. Did you select a filesystem size in the menus?\n");
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return;
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}
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SDFSConfig cfg;
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bool sd = false;
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if (_MISO == 0 || _MISO == 4 || _MISO == 16) {
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SPI.setRX(_MISO);
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SPI.setTX(_MOSI);
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SPI.setSCK(_SCK);
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SDFS.setConfig(SDFSConfig(_CS, SPI_HALF_SPEED, SPI));
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sd = SDFS.begin();
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} else if (_MISO == 8 || _MISO == 12) {
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SPI1.setRX(_MISO);
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SPI1.setTX(_MOSI);
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SPI1.setSCK(_SCK);
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SDFS.setConfig(SDFSConfig(_CS, SPI_HALF_SPEED, SPI1));
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sd = SDFS.begin();
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} else {
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Serial.println(F("ERROR: Unknown SPI Configuration"));
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}
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VFS.map("/lfs", LittleFS); // Onboard flash at /lfs
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if (sd) {
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VFS.map("/sd", SDFS); // SD card mapped to /sd
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}
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VFS.root(LittleFS); // Anything w/o a prefix maps to LittleFS
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Serial.printf("Writing to /lfs/text.txt\n");
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FILE *f = fopen("/lfs/text.txt", "wb");
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fwrite("hello littlefs", 14, 1, f);
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fclose(f);
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if (sd) {
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Serial.printf("Writing to /sd/test.txt, should not overwrite /lfs/text.txt!\n");
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f = fopen("/sd/text.txt", "wb");
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fwrite("hello sdfs", 10, 1, f);
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fclose(f);
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}
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f = fopen("/lfs/text.txt", "rb");
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char buff[33];
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bzero(buff, 33);
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fread(buff, 1, 32, f);
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fclose(f);
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Serial.printf("READ LFS> '%s'\n", buff);
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if (sd) {
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f = fopen("/sd/text.txt", "rb");
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bzero(buff, 33);
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fread(buff, 1, 32, f);
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fclose(f);
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Serial.printf("READ SDFS> '%s'\n", buff);
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}
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f = fopen("/text.txt", "rb");
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bzero(buff, 33);
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fread(buff, 1, 32, f);
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fclose(f);
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Serial.printf("READ default FS (LittleFS)> '%s'\n", buff);
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Serial.printf("\nTesting seeking within a file\n");
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f = fopen("/lfs/text.txt", "rb");
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for (int i = 0; i < 10; i ++) {
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fseek(f, i, SEEK_SET);
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bzero(buff, 33);
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fread(buff, 1, 32, f);
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Serial.printf("LFS SEEK %d> '%s'\n", i, buff);
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}
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fclose(f);
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Serial.printf("\nTesting fprintf and fgetc from LFS\n");
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f = fopen("/lfs/printout.txt", "w");
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for (int i = 0; i < 10; i++) {
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fprintf(f, "INT: %d\n", i);
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}
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fclose(f);
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Serial.printf("----\n");
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f = fopen("/printout.txt", "r");
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int x;
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while ((x = fgetc(f)) >= 0) {
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Serial.printf("%c", x);
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}
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Serial.printf("----\n");
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}
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void loop() {
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}
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