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81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "boot_tests.h"
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#include "board/board.h"
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#include "drivers/button.h"
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#include "drivers/flash.h"
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#include "system/bootbits.h"
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#include "system/logging.h"
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#include "system/rtc_registers.h"
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#include "util/misc.h"
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#include "stm32f4xx.h"
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#include <stdint.h>
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#include <inttypes.h>
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#include <stdbool.h>
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static const int STUCK_BUTTON_THRESHOLD = 5;
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bool is_button_stuck(void) {
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// We store how many times each button has been pressed on previous boots in this
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// rtc backup register. Every time when we boot without that button pressed that
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// counter gets cleared. If the byte reaches 5, return a failure.
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uint32_t button_counter_register = RTC_ReadBackupRegister(STUCK_BUTTON_REGISTER);
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uint8_t* button_counter = (uint8_t*) (&button_counter_register);
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bool result = false;
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for (int button_id = 0; button_id < NUM_BUTTONS; button_id++) {
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if (!button_is_pressed(button_id)) {
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button_counter[button_id] = 0;
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continue;
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}
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if (button_counter[button_id] >= STUCK_BUTTON_THRESHOLD) {
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dbgserial_putstr("Stuck button register is invalid, clearing.");
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char buffer[32];
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itoa(button_counter_register, buffer, sizeof(buffer));
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dbgserial_putstr(buffer);
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RTC_WriteBackupRegister(STUCK_BUTTON_REGISTER, 0);
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return false;
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}
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button_counter[button_id] += 1;
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if (button_counter[button_id] >= STUCK_BUTTON_THRESHOLD) {
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PBL_LOG(LOG_LEVEL_ERROR, "Button id %u is stuck!", button_id);
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result = true;
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}
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}
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if (button_counter_register != 0) {
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dbgserial_putstr("Button is pushed at boot");
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char buffer[32];
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itoa(button_counter_register, buffer, sizeof(buffer));
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dbgserial_putstr(buffer);
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}
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RTC_WriteBackupRegister(STUCK_BUTTON_REGISTER, button_counter_register);
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return result;
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}
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bool is_flash_broken(void) {
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return !flash_sanity_check();
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}
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