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#include <Arduino.h>
#include <string.h>
#include <avr/wdt.h>
#include <helpers/ArduinoHelpers.h>
#include <target.h>
#include "FixedPoolPacketManager.h"
#include "FlashStore.h"
#include "PublicApp.h"
#include "UITask.h"
uint8_t mcusr_mirror __attribute__((section(".noinit")));
uint8_t wdt_stage_mirror __attribute__((section(".noinit")));
extern char __heap_start;
namespace {
const uint8_t WDT_STAGE_IDLE = 'I';
const uint8_t WDT_STAGE_SETUP = 'S';
const uint8_t WDT_STAGE_APP = 'A';
const uint8_t WDT_STAGE_UI = 'U';
const uint8_t WDT_STAGE_FLASH = 'F';
const uint8_t WDT_STAGE_POWER = 'P';
const uint8_t STACK_CANARY = 0xA5;
const uint8_t STACK_GUARD_BYTES = 64;
uint8_t* stack_canary_start = NULL;
uint8_t* stack_canary_end = NULL;
uint16_t stack_min_free = 0;
static uint8_t* currentStackPointer() {
uint16_t sp;
asm volatile(
"in %A0, __SP_L__" "\n\t"
"in %B0, __SP_H__"
: "=r"(sp));
return (uint8_t*)sp;
}
static uint16_t currentStackFree() {
uint8_t* heap_end = (uint8_t*)&__heap_start;
uint8_t* sp = currentStackPointer();
if (sp <= heap_end + STACK_GUARD_BYTES) {
return 0;
}
return (uint16_t)(sp - heap_end - STACK_GUARD_BYTES);
}
static uint16_t scanStackFree() {
if (!stack_canary_start || !stack_canary_end || stack_canary_end <= stack_canary_start) {
return 0;
}
uint8_t* heap_end = stack_canary_start;
if (heap_end >= stack_canary_end) {
return 0;
}
uint8_t* p = stack_canary_end;
while (p > heap_end && *(p - 1) != STACK_CANARY) {
--p;
}
return (uint16_t)(p - heap_end);
}
static void initStackCanary() {
uint8_t* start = (uint8_t*)&__heap_start;
uint8_t* sp = currentStackPointer();
if (sp <= start + STACK_GUARD_BYTES) {
stack_canary_start = NULL;
stack_canary_end = NULL;
stack_min_free = 0;
return;
}
stack_canary_start = start;
stack_canary_end = sp - STACK_GUARD_BYTES;
memset(stack_canary_start, STACK_CANARY, stack_canary_end - stack_canary_start);
stack_min_free = scanStackFree();
}
static void updateStackMinFree() {
uint16_t free_now = scanStackFree();
if (stack_min_free == 0 || free_now < stack_min_free) {
stack_min_free = free_now;
}
}
}
void captureResetCause(void) __attribute__((naked, used, section(".init3")));
void captureResetCause(void) {
mcusr_mirror = MCUSR;
MCUSR = 0;
wdt_disable();
}
static void setWatchdogStage(uint8_t stage) {
wdt_stage_mirror = stage;
}
extern "C" void SRXEWatchdogPoll(void) {
setWatchdogStage(WDT_STAGE_FLASH);
wdt_reset();
}
extern "C" void MeshCoreWatchdogStage(uint8_t stage) {
setWatchdogStage(stage);
}
extern "C" uint16_t MeshCoreStackFreeNow(void) {
updateStackMinFree();
return currentStackFree();
}
extern "C" uint16_t MeshCoreStackFreeMin(void) {
updateStackMinFree();
return stack_min_free;
}
static ArduinoMillis ms_clock;
static FixedPoolPacketManager<4> packet_mgr;
static FlashStore flash_store;
static PublicRTCClock rtc_clock;
static PublicApp app(radio_driver, ms_clock, packet_mgr, rtc_clock, flash_store);
static UITask ui(board, app);
#ifndef SMARTRESPONSE_BUILD_EPOCH
#define SMARTRESPONSE_BUILD_EPOCH 1715770351UL
#endif
static uint32_t initialClockTime() {
uint32_t start = SMARTRESPONSE_BUILD_EPOCH;
uint32_t latest = flash_store.getLatestTimestamp();
if (latest != 0xFFFFFFFFUL && latest >= start) {
start = latest + 1;
}
return start;
}
static void waitForPowerButtonRelease() {
while (board.isPowerButtonPressed()) {
wdt_reset();
delay(10);
}
delay(50);
}
static void sleepUntilPowerButton() {
setWatchdogStage(WDT_STAGE_POWER);
waitForPowerButtonRelease();
radio_driver.powerOff();
wdt_disable();
board.sleep(0);
wdt_enable(WDTO_4S);
app.resetRadio();
ui.redraw();
waitForPowerButtonRelease();
}
static void halt() {
while (1) {
}
}
void setup() {
wdt_disable();
uint8_t last_wdt_stage = (mcusr_mirror & _BV(WDRF)) ? wdt_stage_mirror : '-';
setWatchdogStage(WDT_STAGE_SETUP);
delay(100);
board.begin();
flash_store.begin();
rtc_clock.begin(initialClockTime());
if (!radio_init()) {
halt();
}
app.setResetCause(mcusr_mirror);
app.setWatchdogStage(last_wdt_stage);
app.begin();
ui.begin();
initStackCanary();
setWatchdogStage(WDT_STAGE_IDLE);
wdt_enable(WDTO_4S);
}
void loop() {
setWatchdogStage(WDT_STAGE_IDLE);
wdt_reset();
rtc_clock.tick();
setWatchdogStage(WDT_STAGE_APP);
app.loop();
wdt_reset();
setWatchdogStage(WDT_STAGE_UI);
ui.loop();
if (board.isPowerButtonPressed()) {
sleepUntilPowerButton();
}
updateStackMinFree();
setWatchdogStage(WDT_STAGE_IDLE);
board.idleSleep();
}
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