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‎libraries/UsbHostMsd/examples/USB_HOST_MSD/USB_HOST_MSD.ino

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/*
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Portenta H33 - USB HOST MSD
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The sketch shows how to mount a Mass Storage Device using portenta as Host Device
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The circuit:
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- Portenta H33 + Portenta Breakout
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created February 7th, 2023
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by Daniele Aimo ([email protected])
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This example code is in the public domain.
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*/
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#include <vector>
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#include <string>
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#include "UsbHostMsd.h"
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#include "FATFileSystem.h"
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#define TEST_FS_NAME "usb"
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#define TEST_FOLDER_NAME "TEST_FOLDER"
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#define TEST_FILE "test.txt"
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#define DELETE_FILE_DIMENSION 150
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USBHostMSD block_device;
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FATFileSystem fs(TEST_FS_NAME);
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extern "C" void log_init();
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extern "C" int mylogadd(const char *fmt, ...) ;
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extern "C" void empty_log();
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std::string root_folder = std::string("/") + std::string(TEST_FS_NAME);
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std::string folder_test_name = root_folder + std::string("/") + std::string(TEST_FOLDER_NAME);
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std::string file_test_name = folder_test_name + std::string("/") + std::string(TEST_FILE);
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void setup() {
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log_init();
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/*
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* SERIAL INITIALIZATION
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*/
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Serial.begin(9600);
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while(!Serial) {
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}
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Serial.println("*** USB HOST Mass Storage Device example ***");
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/* list to store all directory in the root */
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std::vector<std::string> dir_list;
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/*
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* Check for device to be connected
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*/
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int count = 0;
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while (!block_device.connect()) {
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if(count == 0) {
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Serial.println("Waiting for Mass Storage Device");
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}
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else {
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Serial.print(".");
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if(count % 30 == 0) {
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Serial.println();
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empty_log();
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}
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}
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count++;
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delay(1000);
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}
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Serial.println("Mass Storage Device connected.");
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/*
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* MOUNTIN SDCARD AS FATFS filesystem
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*/
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Serial.println("Mounting Mass Storage Device...");
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int err = fs.mount(&block_device);
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if (err) {
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// Reformat if we can't mount the filesystem
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// this should only happen on the first boot
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Serial.println("No filesystem found, formatting... ");
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err = fs.reformat(&block_device);
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}
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if (err) {
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Serial.println("Error formatting USB Mass Storage Device");
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while(1);
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}
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/*
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* READING root folder
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*/
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DIR *dir;
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struct dirent *ent;
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int dirIndex = 0;
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Serial.println("*** List USB Mass Storage Device content: ");
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if ((dir = opendir(root_folder.c_str())) != NULL) {
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while ((ent = readdir (dir)) != NULL) {
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if(ent->d_type == DT_REG) {
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Serial.print("- [File]: ");
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}
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else if(ent->d_type == DT_DIR) {
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Serial.print("- [Fold]: ");
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dir_list.push_back(ent->d_name);
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}
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Serial.println(ent->d_name);
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dirIndex++;
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}
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closedir (dir);
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}
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else {
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// Could not open directory
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Serial.println("Error opening USB Mass Storage Device\n");
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while(1);
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}
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bool found_test_folder = false;
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/*
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* LISTING CONTENT of the first level folders (the one immediately present in root folder)
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*/
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if(dir_list.size()) {
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Serial.println();
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Serial.println("Listing content of folders in root: ");
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}
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for(unsigned int i = 0; i < dir_list.size(); i++) {
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if(dir_list[i] == TEST_FOLDER_NAME) {
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found_test_folder = true;
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}
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Serial.print("- ");
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Serial.print(dir_list[i].c_str());
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Serial.println(":");
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std::string d = root_folder + std::string("/") + dir_list[i];
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if ((dir = opendir(d.c_str())) != NULL) {
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while ((ent = readdir (dir)) != NULL) {
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if(ent->d_type == DT_REG) {
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Serial.print(" - [File]: ");
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}
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else if(ent->d_type == DT_DIR) {
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Serial.print(" - [Fold]: ");
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dir_list.push_back(ent->d_name);
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}
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Serial.println(ent->d_name);
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}
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closedir (dir);
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}
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else {
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Serial.print("ERROR OPENING SUB-FOLDER ");
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Serial.println(d.c_str());
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}
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}
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/*
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* CREATING TEST FOLDER (if does not exist already)
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*/
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err = 0;
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if(!found_test_folder) {
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Serial.println("TEST FOLDER NOT FOUND... creating folder test");
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err = mkdir(folder_test_name.c_str(), S_IRWXU | S_IRWXG | S_IRWXO);
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if(err != 0) {
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Serial.print("FAILED folder creation with error ");
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Serial.println(err);
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}
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}
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/*
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* READING TEST FILE CONTENT
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*/
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if(err == 0) {
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int file_dimension = 0;
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FILE* fp = fopen(file_test_name.c_str(), "r");
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if(fp != NULL) {
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Serial.print("Opened file: ");
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Serial.print(file_test_name.c_str());
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Serial.println(" for reading");
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fseek(fp, 0L, SEEK_END);
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int numbytes = ftell(fp);
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fseek(fp, 0L, SEEK_SET);
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Serial.print("Bytes in the file: ");
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Serial.println(numbytes);
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file_dimension = numbytes;
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if(numbytes > 0) {
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Serial.println();
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Serial.println("-------------------- START FILE CONTENT --------------------");
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}
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for(int i = 0; i < numbytes; i++) {
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char ch;
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fread(&ch, sizeof(char), 1, fp);
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Serial.print(ch);
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}
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if(numbytes > 0) {
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Serial.println("--------------------- END FILE CONTENT ---------------------");
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Serial.println();
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}
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else {
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Serial.println("File is EMPTY!");
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Serial.println();
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}
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fclose(fp);
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}
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else {
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Serial.print("FAILED open file ");
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Serial.println(file_test_name.c_str());
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}
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/*
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* DELETE FILE IF THE File dimension is greater than 150 bytes
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*/
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if(file_dimension > DELETE_FILE_DIMENSION) {
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Serial.println("Test file reached the delete dimension... deleting it!");
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if(remove(file_test_name.c_str()) == 0) {
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Serial.println("TEST FILE HAS BEEN DELETED!");
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}
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}
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/*
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* APPENDING SOMETHING TO FILE
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*/
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fp = fopen(file_test_name.c_str(), "a");
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if(fp != NULL) {
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Serial.print("Opened file: ");
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Serial.print(file_test_name.c_str());
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Serial.println(" for writing (append)");
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char text[] = "This line has been appended to file!\n";
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fwrite(text, sizeof(char), strlen(text), fp);
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fclose(fp);
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}
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else {
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Serial.print("FAILED open file for appending ");
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Serial.println(file_test_name.c_str());
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}
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/*
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* READING AGAIN FILE CONTENT
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*/
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fp = fopen(file_test_name.c_str(), "r");
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if(fp != NULL) {
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Serial.print("Opened file: ");
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Serial.print(file_test_name.c_str());
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Serial.println(" for reading");
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fseek(fp, 0L, SEEK_END);
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int numbytes = ftell(fp);
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fseek(fp, 0L, SEEK_SET);
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Serial.print("Bytes in the file: ");
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Serial.println(numbytes);
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if(numbytes > 0) {
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Serial.println();
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Serial.println("-------------------- START FILE CONTENT --------------------");
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}
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for(int i = 0; i < numbytes; i++) {
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char ch;
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fread(&ch, sizeof(char), 1, fp);
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Serial.print(ch);
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}
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if(numbytes > 0) {
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Serial.println("--------------------- END FILE CONTENT ---------------------");
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Serial.println();
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}
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else {
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Serial.println("File is EMPTY!");
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Serial.println();
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}
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fclose(fp);
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}
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else {
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Serial.print("FAILED open file for appending ");
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Serial.println(file_test_name.c_str());
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}
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}
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if(dirIndex == 0) {
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Serial.println("Empty SDCARD");
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}
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}
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void loop() {
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// Empty
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}

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