86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/*
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* versuch4_write-file.c
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*
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* Created on: Dec 1, 2025
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* Author: jonny
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*/
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#include "versuch4_write-file.h"
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#include "fatfs.h"
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void versuch4_write_file(void)
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{
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FATFS fs;
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FIL fp;
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FRESULT res;
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// mount fs
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printf("1. mounting filesystem...\n");
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res = f_mount(&fs, "/", 0);
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if (res != FR_OK){
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printf("Fehler beim mounten vom dateisystem\n");
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return;
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}
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// open file
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printf("2. opening file...\n");
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res = f_open(&fp, "test-asd.txt", FA_CREATE_ALWAYS | FA_WRITE);
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if (res != FR_OK)
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{
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printf("Fehler beim Oeffnen der Datei!\n");
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return;
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}
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// write file
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printf("3. writing file...\n");
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UINT numBytesWritten = 0;
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char buf[] = "heute ist der 02.12.2025";
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res = f_write(&fp, buf, strlen(buf), &numBytesWritten);
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if (res != FR_OK || numBytesWritten == 0)
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printf("Fehler beim schreiben der datei\n");
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printf("wrote %d bytes\n", numBytesWritten);
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// close file
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printf("4. closing file...\n");
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f_close(&fp);
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// open file
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printf("5. opening file...\n");
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res = f_open(&fp, "test-asd.txt", FA_READ);
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if (res != FR_OK)
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{
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printf("Fehler beim Oeffnen der Datei!\n");
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return;
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}
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// read file
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printf("6. reading file...\n");
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char bufRead[26];
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uint8_t numBytesRead = 0;
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res = f_read(&fp, bufRead, 25, &numBytesRead);
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printf("read bytes: %d\n", numBytesRead);
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bufRead[numBytesRead] = 0;
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//printf("read text: %s\n", bufRead);
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if (res == FR_OK && numBytesWritten > 0){
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//bufRead[25] = 0;
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printf("Gelesene Zeichen: %s\n", bufRead);
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}
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else
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printf("Fehler beim lesen der Datei oder weniger als 25 Zeichen\n");
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// close file
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printf("4. closing file...\n");
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f_close(&fp);
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}
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