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Import of the watch repository from Pebble

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Matthieu Jeanson 2024-12-12 16:43:03 -08:00 • committed by Katharine Berry
commit 3b92768480
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platform/tintin/boot/src/system/bootbits.c Normal file
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/*
* 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 "drivers/dbgserial.h"
#include "system/bootbits.h"
#include "system/rtc_registers.h"
#include "git_version.auto.h"
#include "stm32f2xx.h"
#include <inttypes.h>
#include <stdint.h>
static const uint32_t s_bootloader_timestamp = GIT_TIMESTAMP;
void boot_bit_init(void) {
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) {
dbgserial_print("Boot bits: ");
dbgserial_print_hex(RTC_ReadBackupRegister(RTC_BKP_BOOTBIT_DR));
dbgserial_newline();
}
void boot_version_write(void) {
if (boot_version_read() == s_bootloader_timestamp) {
return;
}
RTC_WriteBackupRegister(BOOTLOADER_VERSION_REGISTER, s_bootloader_timestamp);
}
uint32_t boot_version_read(void) {
return RTC_ReadBackupRegister(BOOTLOADER_VERSION_REGISTER);
}