add littlefs filesystem browser app

2 files changed, 231 insertions, 0 deletions

diff --git a/apps/filesystem-browser/Makefile b/apps/filesystem-browser/Makefile
new file mode 100755
index 00000000..a37c98d7
--- /dev/null
+++ b/apps/filesystem-browser/Makefile
@@ -0,0 +1,13 @@
+TOP = ../..
+include $(TOP)/make.mk
+
+INCLUDES += \
+  -I$(TOP)/littlefs/ \
+  -I./
+
+SRCS += \
+  $(TOP)/littlefs/lfs.c \
+  $(TOP)/littlefs/lfs_util.c \
+  ./browser.c
+
+include $(TOP)/rules.mk
diff --git a/apps/filesystem-browser/browser.c b/apps/filesystem-browser/browser.c
new file mode 100644
index 00000000..daa77863
--- /dev/null
+++ b/apps/filesystem-browser/browser.c
@@ -0,0 +1,218 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <peripheral_clk_config.h>
+#include "watch.h"
+#include "lfs.h"
+#include "hpl_flash.h"
+
+int lfs_storage_read(const struct lfs_config *cfg, lfs_block_t block, lfs_off_t off, void *buffer, lfs_size_t size);
+int lfs_storage_prog(const struct lfs_config *cfg, lfs_block_t block, lfs_off_t off, const void *buffer, lfs_size_t size);
+int lfs_storage_erase(const struct lfs_config *cfg, lfs_block_t block);
+int lfs_storage_sync(const struct lfs_config *cfg);
+
+int lfs_storage_read(const struct lfs_config *cfg, lfs_block_t block, lfs_off_t off, void *buffer, lfs_size_t size) {
+    (void) cfg;
+    return !watch_storage_read(block, off, (void *)buffer, size);
+}
+
+int lfs_storage_prog(const struct lfs_config *cfg, lfs_block_t block, lfs_off_t off, const void *buffer, lfs_size_t size) {
+    (void) cfg;
+    return !watch_storage_write(block, off, (void *)buffer, size);
+}
+
+int lfs_storage_erase(const struct lfs_config *cfg, lfs_block_t block) {
+    (void) cfg;
+    return !watch_storage_erase(block);
+}
+
+int lfs_storage_sync(const struct lfs_config *cfg) {
+    (void) cfg;
+    return !watch_storage_sync();
+}
+
+const struct lfs_config cfg = {
+    // block device operations
+    .read  = lfs_storage_read,
+    .prog  = lfs_storage_prog,
+    .erase = lfs_storage_erase,
+    .sync  = lfs_storage_sync,
+
+    // block device configuration
+    .read_size = 16,
+    .prog_size = NVMCTRL_PAGE_SIZE,
+    .block_size = NVMCTRL_ROW_SIZE,
+    .block_count = NVMCTRL_RWWEE_PAGES / 4,
+    .cache_size = NVMCTRL_PAGE_SIZE,
+    .lookahead_size = 16,
+    .block_cycles = 100,
+};
+
+lfs_t lfs;
+lfs_file_t file;
+
+static int _traverse_df_cb(void *p, lfs_block_t block) {
+    (void) block;
+	uint32_t *nb = p;
+	*nb += 1;
+	return 0;
+}
+
+static int get_free_space(void){
+	int err;
+
+	uint32_t free_blocks = 0;
+	err = lfs_fs_traverse(&lfs, _traverse_df_cb, &free_blocks);
+	if(err < 0){
+		return err;
+	}
+
+	uint32_t available = cfg.block_count * cfg.block_size - free_blocks * cfg.block_size;
+
+	return available;
+}
+
+static int lfs_ls(lfs_t *lfs, const char *path) {
+    lfs_dir_t dir;
+    int err = lfs_dir_open(lfs, &dir, path);
+    if (err) {
+        return err;
+    }
+
+    struct lfs_info info;
+    while (true) {
+        int res = lfs_dir_read(lfs, &dir, &info);
+        if (res < 0) {
+            return res;
+        }
+
+        if (res == 0) {
+            break;
+        }
+
+        switch (info.type) {
+            case LFS_TYPE_REG: printf("file "); break;
+            case LFS_TYPE_DIR: printf("dir  "); break;
+            default:           printf("?    "); break;
+        }
+
+        printf("%4ld bytes ", info.size);
+
+        printf("%s\n", info.name);
+    }
+
+    err = lfs_dir_close(lfs, &dir);
+    if (err) {
+        return err;
+    }
+
+    return 0;
+}
+
+void app_init(void) {
+}
+
+void app_wake_from_backup(void) {
+}
+
+void app_setup(void) {
+    // mount the filesystem
+    int err = lfs_mount(&lfs, &cfg);
+
+    // reformat if we can't mount the filesystem
+    // this should only happen on the first boot
+    if (err) {
+        lfs_format(&lfs, &cfg);
+        lfs_mount(&lfs, &cfg);
+    }
+}
+
+void app_prepare_for_standby(void) {
+}
+
+void app_wake_from_standby(void) {
+}
+
+bool app_loop(void) {
+    char line[256] = {0};
+    char *buf;
+    struct lfs_info info;
+
+    read(0, line, 256);
+    if (strlen(line)) {
+        printf("$ %s", line);
+        char *command = strtok(line, " \n");
+        
+        if (strcmp(command, "ls") == 0) {
+            char *directory = strtok(NULL, " \n");
+            if (directory == NULL) {
+                lfs_ls(&lfs, "/");
+            } else {
+                printf("usage: ls\n");
+            }
+        } else if (strcmp(command, "cat") == 0) {
+            char *filename = strtok(NULL, " \n");
+            if (filename == NULL) {
+                printf("usage: cat file\n");
+            } else {
+                info.type = 0;
+                lfs_stat(&lfs, filename, &info);
+                if (info.type == LFS_TYPE_REG) {
+                    if (info.size > 0) {
+                        buf = malloc(info.size);
+                        lfs_file_open(&lfs, &file, filename, LFS_O_RDONLY);
+                        lfs_file_read(&lfs, &file, buf, info.size);
+                        printf("%s\n", buf);
+                        free(buf);
+                        lfs_file_close(&lfs, &file);
+                    } else {
+                        printf("\n");
+                    }
+                } else {
+                    printf("cat: %s: No such file\n", filename);
+                }
+            }
+        } else if (strcmp(command, "df") == 0) {
+            printf("free space: %d bytes\n", get_free_space());
+        } else if (strcmp(command, "rm") == 0) {
+            char *filename = strtok(NULL, " \n");
+            if (filename == NULL) {
+                printf("usage: rm file\n");
+            } else {
+                info.type = 0;
+                lfs_stat(&lfs, filename, &info);
+                if (info.type == LFS_TYPE_REG) {
+                    lfs_remove(&lfs, filename);
+                } else {
+                    printf("rm: %s: No such file\n", filename);
+                }
+            } 
+        } else if (strcmp(command, "echo") == 0) {
+            buf = malloc(64);
+            memset(buf, 0, 64);
+            size_t pos = 0;
+            char *text = strtok(NULL, " \n");
+            while (strcmp(text, ">")) {
+                sprintf(buf + pos, "%s ", text);
+                pos += strlen(text) + 1;
+                text = strtok(NULL, " \n");
+                if (text == NULL) break;
+            }
+            buf[strlen(buf) - 1] = 0;
+            char *filename = strtok(NULL, " \n");
+            if (filename == NULL) {
+                printf("usage: echo text > file\n");
+            } else if (strchr(filename, '/') || strchr(filename, '\\')) {
+                printf("subdirectories are not supported\n");
+            } else {
+                lfs_file_open(&lfs, &file, filename, LFS_O_RDWR | LFS_O_CREAT | LFS_O_TRUNC);
+                lfs_file_write(&lfs, &file, buf, strlen(buf));
+                lfs_file_close(&lfs, &file);
+            }
+            free(buf);
+        } else {
+            printf("%s: command not found\n", command);
+        }
+    }
+    return false;
+}