Diff: main.cpp

Revision:

0:8eedb2495d52

Child:

1:080085a0a3ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Aug 09 01:42:53 2018 +0000
@@ -0,0 +1,85 @@
+#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)
+DigitalOut SD_POWER(PA_15, 1);
+#endif
+
+SDBlockDevice sd(MBED_CONF_APP_SPI_MOSI, MBED_CONF_APP_SPI_MISO, MBED_CONF_APP_SPI_CLK, MBED_CONF_APP_SPI_CS);
+FATFileSystem fs("sd", &sd);
+Serial pc(USBTX, USBRX, 115200);
+
+void return_error(int ret_val)
+{
+    if (ret_val)
+        pc.printf("Failure. %d\n", ret_val);
+    else
+        pc.printf("done.\n");
+}
+
+void errno_error(void* ret_val)
+{
+    if (ret_val == NULL)
+        pc.printf(" Failure. %d \n", errno);
+    else
+        pc.printf(" done.\n");
+}
+
+int main()
+{
+    int error = 0;
+    pc.printf("Welcome to the filesystem example.\n");
+
+    pc.printf("Opening a new file, numbers.txt.");
+    FILE* fd = fopen("/sd/numbers.txt", "w+");
+    errno_error(fd);
+
+    for (int i = 0; i < 20; i++) {
+        pc.printf("Writing decimal numbers to a file (%d/20)\r", i);
+        fprintf(fd, "%d\n", i);
+    }
+    pc.printf("Writing decimal numbers to a file (20/20) done.\n");
+
+    pc.printf("Closing file.");
+    fclose(fd);
+    pc.printf(" done.\n");
+
+    pc.printf("Re-opening file read-only.");
+    fd = fopen("/sd/numbers.txt", "r");
+    errno_error(fd);
+
+    pc.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);
+    }
+    pc.printf("EOF.\n");
+
+    pc.printf("Closing file.");
+    fclose(fd);
+    pc.printf(" done.\n");
+
+    pc.printf("Opening root directory.");
+    DIR* dir = opendir("/sd/");
+    errno_error(fd);
+
+    struct dirent* de;
+    pc.printf("Printing all filenames:\n");
+    while((de = readdir(dir)) != NULL) {
+        pc.printf("  %s\n", &(de->d_name)[0]);
+    }
+
+    pc.printf("Closeing root directory. ");
+    error = closedir(dir);
+    return_error(error);
+    pc.printf("Filesystem Demo complete.\n");
+
+    while (true) {}
+}