add support for a small filesystem on the watch

apps/eeprom-emulation-upgrade/Makefile

@@ -0,0 +1,10 @@
+TOP = ../..
+include $(TOP)/make.mk
+
+INCLUDES += \
+  -I./
+
+SRCS += \
+  ./app.c
+
+include $(TOP)/rules.mk

apps/eeprom-emulation-upgrade/app.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <peripheral_clk_config.h>
+#include "watch.h"
+
+void app_init(void) {
+}
+
+void app_wake_from_backup(void) {
+}
+
+void app_setup(void) {
+    delay_ms(5000);
+    while (!(NVMCTRL->INTFLAG.reg & NVMCTRL_INTFLAG_READY));
+    uint32_t user_row = (*((uint32_t *)NVMCTRL_AUX0_ADDRESS));
+    uint8_t eeprom = (user_row >> NVMCTRL_FUSES_EEPROM_SIZE_Pos) & 7;
+    printf("User row read successfully: 0x%lx\n", user_row);
+
+    if (eeprom != 1) {
+        user_row &= ~NVMCTRL_FUSES_EEPROM_SIZE_Msk;
+        user_row |= NVMCTRL_FUSES_EEPROM_SIZE(1);
+        if (NVMCTRL->STATUS.reg & NVMCTRL_STATUS_SB) {
+            printf("Secured bit was set; cannot perform upgrade.\n");
+            return;
+        }
+        printf("EEPROM configuration was %d.\nApplying change...\n", eeprom);
+
+        uint32_t temp = NVMCTRL->CTRLB.reg;                                     // Backup settings
+        NVMCTRL->CTRLB.reg = temp | NVMCTRL_CTRLB_CACHEDIS;                     // Disable Cache
+        NVMCTRL->STATUS.reg |= NVMCTRL_STATUS_MASK;                             // Clear error flags
+        NVMCTRL->ADDR.reg = NVMCTRL_AUX0_ADDRESS / 2;                           // Set address, command will be issued elsewhere
+        NVMCTRL->CTRLA.reg = NVMCTRL_CTRLA_CMD_EAR | NVMCTRL_CTRLA_CMDEX_KEY;   // Erase the user page
+        while (!(NVMCTRL->INTFLAG.reg & NVMCTRL_INTFLAG_READY));                // Wait for NVM command to complete
+        NVMCTRL->STATUS.reg |= NVMCTRL_STATUS_MASK;                             // Clear error flags
+        NVMCTRL->ADDR.reg = NVMCTRL_AUX0_ADDRESS / 2;                           // Set address, command will be issued elsewhere
+        NVMCTRL->CTRLA.reg = NVMCTRL_CTRLA_CMD_PBC | NVMCTRL_CTRLA_CMDEX_KEY;   // Erase the page buffer before buffering new data
+        while (!(NVMCTRL->INTFLAG.reg & NVMCTRL_INTFLAG_READY));                // Wait for NVM command to complete
+        NVMCTRL->STATUS.reg |= NVMCTRL_STATUS_MASK;                             // Clear error flags
+        NVMCTRL->ADDR.reg = NVMCTRL_AUX0_ADDRESS / 2;                           // Set address, command will be issued elsewhere
+        *((uint32_t *)NVMCTRL_AUX0_ADDRESS) = user_row;                         // write the new fuse values to the memory buffer
+        NVMCTRL->CTRLA.reg = NVMCTRL_CTRLA_CMD_WAP | NVMCTRL_CTRLA_CMDEX_KEY;   // Write the user page
+        NVMCTRL->CTRLB.reg = temp;                                              // Restore settings
+
+        printf("Done! Resetting...\n");
+        delay_ms(1000);
+        NVIC_SystemReset();
+    } else {
+        printf("EEPROM configuration was %d (8192 bytes). Upgrade successful!\n", eeprom);
+    }
+    printf("%d %d\n", eeprom, NVMCTRL->PARAM.bit.RWWEEP);
+}
+
+void app_prepare_for_standby(void) {
+}
+
+void app_wake_from_standby(void) {
+}
+
+bool app_loop(void) {
+    return true;
+}

apps/flash-test/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 \
+  ./app.c
+
+include $(TOP)/rules.mk

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;
+}