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AvrDudeTelnet.ino
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AvrDudeTelnet.ino
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/**
* avrdude can use telnet to do a serial upload.
* this esp8266 sketch receives the upload and forwards it to Serial.
* On the other side of the esp8266 Serial should be a Serial port
* of AVR MCU with bootloader (the RX/TX pins where the bootloader listens)
*
* (the SERIAL_SWITCH_PIN is for Uno WiFi Dev Ed, where the Serial connection
* is switched by the esp between esp and the USB chip.)
*
* example of the upload command:
* avrdude -Cavrdude.conf -v -patmega328p -carduino -Pnet:192.168.1.102:23 -D -Uflash:w:Blink.ino.hex:i
*
* created in December 2019
* by Juraj Andrassy https://github.com/jandrassy
*/
#include <ESP8266WiFi.h>
#include "arduino_secrets.h"
//const int SERIAL_SWITCH_PIN = 4;
const int TARGET_RESET_PIN = 5;
WiFiServer telnetServer(23);
void setup() {
Serial.begin(115200);
delay(100);
Serial.println("START");
#ifdef SERIAL_SWITCH_PIN
pinMode(SERIAL_SWITCH_PIN, OUTPUT);
digitalWrite(SERIAL_SWITCH_PIN, HIGH);
#endif
WiFi.begin(SECRET_SSID, SECRET_PASS);
if (!WiFi.waitForConnectResult()) {
Serial.println("WiFi not connected");
while (1) {
delay(1000);
}
}
Serial.println(WiFi.localIP());
telnetServer.begin();
}
void loop() {
WiFiClient telnetClient = telnetServer.available();
if (telnetClient) {
#ifdef SERIAL_SWITCH_PIN
digitalWrite(SERIAL_SWITCH_PIN, LOW);
#endif
pinMode(TARGET_RESET_PIN, OUTPUT);
digitalWrite(TARGET_RESET_PIN, LOW);
delayMicroseconds(5);
pinMode(TARGET_RESET_PIN, INPUT); // let it to reset pin's pull-up
while (telnetClient.connected() || telnetClient.available()) {
while (telnetClient.available()) {
Serial.write(telnetClient.read());
}
while (Serial.available()) {
telnetClient.write(Serial.read());
}
}
#ifdef SERIAL_SWITCH_PIN
digitalWrite(SERIAL_SWITCH_PIN, HIGH);
#endif
}
}