Atmosphere/fusee/fusee-primary/src/sd_utils.c

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#include "sd_utils.h"
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#include "hwinit.h"
#include "sdmmc.h"
#include "lib/printk.h"
#include "ff.h"
/* This is used by diskio.h. */
struct mmc sd_mmc;
FATFS sd_fs;
static int initialized_sd = 0;
static int mounted_sd = 0;
int initialize_sd(void) {
if (initialized_sd) {
return 1;
}
mc_enable_ahb_redirect();
if (sdmmc_init(&sd_mmc, SWITCH_MICROSD) == 0) {
printk("Initialized SD card!\n");
initialized_sd = 1;
}
return initialized_sd;
}
int mount_sd(void) {
if (mounted_sd) {
return 1;
}
if (f_mount(&sd_fs, "", 1) == FR_OK) {
printk("Mounted SD card!\n");
mounted_sd = 1;
}
return mounted_sd;
}
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size_t read_sd_file(void *dst, size_t dst_size, const char *filename) {
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if (!initialized_sd && initialize_sd() == 0) {
return 0;
}
if (!mounted_sd && mount_sd() == 0) {
return 0;
}
FIL f;
if (f_open(&f, filename, FA_READ) != FR_OK) {
return 0;
}
UINT br;
int res = f_read(&f, dst, dst_size, &br);
f_close(&f);
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return res == FR_OK ? (int)br : 0;
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}