https://medium.com/@manuel.bl/low-cost-esp32-in-circuit-debugging-dbbee39e508b Seems to be the best guide.
0. Purchase ESP-PROG JTAG Debugger ^ ^ ^
1. Install VS Code:
https://code.visualstudio.com/
2. Install PlatformIO:
https://docs.platformio.org/en/latest/ide/vscode.html#installation
Note: Despite them not mentioning it, you have to restart VSCode, and then there is a LONG period of downloading things and requesting permissions to modify your computer and so on. And then restarting VSCode again.
3. Connect TCK, TMI, TDI, and TDO from ESP-Prog to ESP-32 (see ESP32 Pinout here and silkscreen bottom of ESP-Prog)
4. Install drivers for FTDI chip on ESP-Prog
https://www.ftdichip.com/Drivers/VCP.htm
5. Connect ESP-Prog and insure drivers are found.
6. Remove the default driver from ONE of the com ports of the ESP-Prog via Zadig (select "Options" and check "List All Devices", select "Dual RS232-HS (Interface 0)", click "Replace driver").
In Device Manager, you should see:
- Under Ports (COM & LPT) should should see a Silicon Labs CP2102 (for the ESP-32 USB connection) and a "USB Serial Port" (for the ESP-Prog connection).
- Under "Universal Serial Bus controllers" the "USB Serial Converter B" should remain (the "A" should disappear on this step)
- Under "Universal Serial Bus devices" you should see "Dual RS232-HS (Interface 0)"
7. In VSCode, open a new Platform IO project, and in the platform.ini file, add:
debug_tool = esp-prog debug_init_break = tbreak setup
8. main.cpp should have the standard blink code or something else simple.
9. Select the correct device from the status line at the very bottom. You
may also need to adjust the com port. For some reason, the device is not
correctly identified.
Serial monitor may be opened from the status line. Select the port of the
ESP-32 (the Silicon Labs one) but this will cause the debugger to lose control
if it's running. You must open the monitor first, then start debugging.
Pin-out in google spreadsheet
Note: there is no LED on a data pin. So "Hello World!" needs external hardware or use serial.
#include "WiFi.h"
#include "ESPAsyncWebServer.h"
const char *ssid = "MyESP32AP";
const char *password = "testpassword";
AsyncWebServer server(80);
void setup(){
Serial.begin(115200);
WiFi.softAP(ssid, password);
Serial.println();
Serial.print("IP address: ");
Serial.println(WiFi.softAPIP());
server.on("/hello", HTTP_GET, [](AsyncWebServerRequest *request){
request->send(200, "text/plain", "Hello World");
});
server.begin();
}
void loop(){}