Import of the watch repository from Pebble

src/fw/system/bootbits.c

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "system/bootbits.h"
+
+#include "drivers/rtc.h"
+#include "system/logging.h"
+#include "system/version.h"
+
+#define STM32F2_COMPATIBLE
+#define STM32F4_COMPATIBLE
+#define STM32F7_COMPATIBLE
+#include <mcu.h>
+
+#include <inttypes.h>
+#include <stdint.h>
+
+void boot_bit_init(void) {
+  rtc_init();
+
+  if (!boot_bit_test(BOOT_BIT_INITIALIZED)) {
+    RTC_WriteBackupRegister(RTC_BKP_BOOTBIT_DR, BOOT_BIT_INITIALIZED);
+  }
+}
+
+void boot_bit_set(BootBitValue bit) {
+  uint32_t current_value = RTC_ReadBackupRegister(RTC_BKP_BOOTBIT_DR);
+  current_value |= bit;
+  RTC_WriteBackupRegister(RTC_BKP_BOOTBIT_DR, current_value);
+}
+
+void boot_bit_clear(BootBitValue bit) {
+  uint32_t current_value = RTC_ReadBackupRegister(RTC_BKP_BOOTBIT_DR);
+  current_value &= ~bit;
+  RTC_WriteBackupRegister(RTC_BKP_BOOTBIT_DR, current_value);
+}
+
+bool boot_bit_test(BootBitValue bit) {
+  uint32_t current_value = RTC_ReadBackupRegister(RTC_BKP_BOOTBIT_DR);
+  return (current_value & bit);
+}
+
+void boot_bit_dump(void) {
+  PBL_LOG(LOG_LEVEL_DEBUG, "0x%"PRIx32, RTC_ReadBackupRegister(RTC_BKP_BOOTBIT_DR));
+}
+
+uint32_t boot_bits_get(void) {
+  return RTC_ReadBackupRegister(RTC_BKP_BOOTBIT_DR);
+}
+
+void command_boot_bits_get(void) {
+  char buffer[32];
+  dbgserial_putstr_fmt(buffer, sizeof(buffer), "bootbits: 0x%"PRIu32, boot_bits_get());
+}
+
+void boot_version_write(void) {
+  if (boot_version_read() == TINTIN_METADATA.version_timestamp) {
+    return;
+  }
+  RTC_WriteBackupRegister(BOOTLOADER_VERSION_REGISTER, TINTIN_METADATA.version_timestamp);
+}
+
+uint32_t boot_version_read(void) {
+  return RTC_ReadBackupRegister(BOOTLOADER_VERSION_REGISTER);
+}