SD card example code for Seeed Wio 3G
Fork of Wio_3G-example-sd-driver by
main.cpp
- Committer:
- ytsuboi
- Date:
- 2018-12-03
- Revision:
- 1:080085a0a3ec
- Parent:
- 0:8eedb2495d52
File content as of revision 1:080085a0a3ec:
#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 // #define DO_FORMAT 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; #if defined(DO_FORMAT) pc.printf("Welcome to the filesystem example.\r\n" "Formatting... "); error = FATFileSystem::format(&sd); return_error(error); #else pc.printf("Welcome to the filesystem example.\r\n"); #endif 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) {} }