From d4ebe64af05e2fa163bcea0dd699ae9c8934cc6f Mon Sep 17 00:00:00 2001
From: Joey Castillo <joeycastillo@utexas.edu>
Date: Fri, 6 May 2022 17:06:27 -0400
Subject: add support for a small filesystem on the watch

---
 apps/flash-test/app.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 apps/flash-test/app.c

(limited to 'apps/flash-test/app.c')

diff --git a/apps/flash-test/app.c b/apps/flash-test/app.c
new file mode 100644
index 00000000..17b1d0aa
--- /dev/null
+++ b/apps/flash-test/app.c
@@ -0,0 +1,131 @@
+#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 void cb_tick(void) {
+    watch_date_time date_time = watch_rtc_get_date_time();
+    if (date_time.unit.second == 0) {
+        int err = lfs_mount(&lfs, &cfg);
+        if (err) {
+            printf("Mount failed: %d\n", err);
+        }
+        // read current count
+        uint32_t loop_count = 0;
+        lfs_file_open(&lfs, &file, "loop_count", LFS_O_RDWR | LFS_O_CREAT);
+        lfs_file_read(&lfs, &file, &loop_count, sizeof(loop_count));
+
+        // update loop count
+        loop_count += 1;
+        lfs_file_rewind(&lfs, &file);
+        lfs_file_write(&lfs, &file, &loop_count, sizeof(loop_count));
+
+        // remember the storage is not updated until the file is closed successfully
+        lfs_file_close(&lfs, &file);
+
+        // release any resources we were using
+        lfs_unmount(&lfs);
+
+        // print the boot count
+        printf("loop_count: %ld\n", loop_count);
+        printf("free space: %d\n", get_free_space());
+    }
+}
+
+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);
+    }
+    watch_rtc_register_tick_callback(cb_tick);
+}
+
+void app_prepare_for_standby(void) {
+}
+
+void app_wake_from_standby(void) {
+}
+
+bool app_loop(void) {
+    return true;
+}
-- 
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