Diff: main.cpp

Revision:

0:5e920a8fb894

Child:

1:bda3045adb2f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Feb 12 08:04:50 2019 +0000
@@ -0,0 +1,87 @@
+#include "mbed.h"
+#include "FATFileSystem.h"
+#include "SDBlockDevice.h"
+#include <stdio.h>
+#include <errno.h>
+/* mbed_retarget.h is included after errno.h so symbols are mapped to
+ * consistent values for all toolchains */
+#include "platform/mbed_retarget.h"
+
+#if defined(TARGET_WIO_3G) || defined(TARGET_WIO_BG96) 
+DigitalOut SD_POWER(PA_15, 1);
+#endif
+
+SDBlockDevice sd(MBED_CONF_SD_SPI_MOSI, 
+                 MBED_CONF_SD_SPI_MISO, 
+                 MBED_CONF_SD_SPI_CLK, 
+                 MBED_CONF_SD_SPI_CS);
+FATFileSystem fs("sd", &sd);
+
+void return_error(int ret_val){
+  if (ret_val)
+    printf("Failure. %d\n", ret_val);
+  else
+    printf("done.\n");
+}
+
+void errno_error(void* ret_val){
+  if (ret_val == NULL) {
+    printf(" Failure. %d \n", errno);
+    while (true) __WFI();
+  } else
+    printf(" done.\n");
+}
+
+int main()
+{
+    int error = 0;
+    printf("Welcome to the filesystem example.\n");
+
+    printf("Opening a new file, numbers.txt.");
+    FILE* fd = fopen("/sd/numbers.txt", "w+");
+    errno_error(fd);
+
+    for (int i = 0; i < 20; i++){
+        printf("Writing decimal numbers to a file (%d/20)\r", i);
+        fprintf(fd, "%d\n", i);
+    }
+    printf("Writing decimal numbers to a file (20/20) done.\n");
+
+    printf("Closing file.");
+    fclose(fd);
+    printf(" done.\n");
+
+    printf("Re-opening file read-only.");
+    fd = fopen("/sd/numbers.txt", "r");
+    errno_error(fd);
+
+    printf("Dumping file to screen.\n");
+    char buff[16] = {0};
+    while (!feof(fd)){
+        int size = fread(&buff[0], 1, 15, fd);
+        fwrite(&buff[0], 1, size, stdout);
+    }
+    printf("EOF.\n");
+
+    printf("Closing file.");
+    fclose(fd);
+    printf(" done.\n");
+
+    printf("Opening root directory.");
+    DIR* dir = opendir("/sd/");
+    errno_error(fd);
+
+    struct dirent* de;
+    printf("Printing all filenames:\n");
+    while((de = readdir(dir)) != NULL){
+        printf("  %s\n", &(de->d_name)[0]);
+    }
+
+    printf("Closeing root directory. ");
+    error = closedir(dir);
+    return_error(error);
+    printf("Filesystem Demo complete.\n");
+
+    while (true) {}
+}
+