snark13/Xteink-X4-crosspoint-reader
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fix: hard reset via RTS pin after flashing firmware (#437)
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## Summary

* Disables going to sleep after uploading new firmware
* Makes developer experience easier

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**< NO >**_

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
Arthur Tazhitdinov 2026-01-21 17:35:23 +05:00 committed by GitHub
parent cc74039cab
commit 838993259d
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1 changed files with 22 additions and 3 deletions
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23
src/main.cpp
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@ -276,13 +276,30 @@ void setupDisplayAndFonts() {
Serial.printf("[%lu] [ ] Fonts setup\n", millis());
}
bool isUsbConnected() {
// U0RXD/GPIO20 reads HIGH when USB is connected
return digitalRead(UART0_RXD) == HIGH;
}
bool isWakeupAfterFlashing() {
const auto wakeupCause = esp_sleep_get_wakeup_cause();
const auto resetReason = esp_reset_reason();
return isUsbConnected() && (wakeupCause == ESP_SLEEP_WAKEUP_UNDEFINED) && (resetReason == ESP_RST_UNKNOWN);
}
void setup() {
t1 = millis();
// Only start serial if USB connected
pinMode(UART0_RXD, INPUT);
if (digitalRead(UART0_RXD) == HIGH) {
if (isUsbConnected()) {
Serial.begin(115200);
// Wait up to 3 seconds for Serial to be ready to catch early logs
unsigned long start = millis();
while (!Serial && (millis() - start) < 3000) {
delay(10);
}
}
inputManager.begin();
@ -305,8 +322,10 @@ void setup() {
SETTINGS.loadFromFile();
KOREADER_STORE.loadFromFile();
// verify power button press duration after we've read settings.
if (!isWakeupAfterFlashing()) {
// For normal wakeups (not immediately after flashing), verify long press
verifyWakeupLongPress();
}
// First serial output only here to avoid timing inconsistencies for power button press duration verification
Serial.printf("[%lu] [ ] Starting CrossPoint version " CROSSPOINT_VERSION "\n", millis());