ESP8266: Able to flash but no program execution

[Trior]

Hi everyone,

I designed a PCB based on the ESP8266EX dotn here is the schematic:



To flash the board I use the module: https://joy-it.net/de/products/SBC-ESP8266-PROG I am able to flash the board with Arduino IDE with a simple code:


void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
Serial.println("OK");
}

void loop() {
// put your main code here, to run repeatedly:
Serial.println("OK");
delay(1000);
}

Result of the flashing:


But when I open the serial monitor, nothing happens.

All the pins of the 8-pin connector are connected respectively to the Joy-it module.

Flash configuration :

• Card Type: Generic ESP8266 Module"
• Upload Speed: "57600
• CPU Frequency: "160 MHz
• Crystal Frequency: "40 MHz
• Flash Size: "4MB (FS:3MB OTA:~512KB)"
• Flash Mode: "DIO"
• >Flash Frequency

I've tried different flash configurations without success.

I wonder if it's a connection problem between CHIP_EN and RST pin.

Flash datasheets: https://datasheet.lcsc.com/lcsc/2201121400_HTCSEMI-HT25WD40ARZ_C2928800.pdf

ESP8266EX datasheet: https://www.espressif.com/sites/default/files/documentation/0a-esp8266ex_datasheet_en.pdf

 

[danadak]

If you look at the Nodemcu schematic can you can see the pins that
need to be committed :

https://circuits4you.com/wp-content/uploads/2017/12/nodemcu-circuit-diagram.png

ESP8266 Pinout Reference: How To Use ESP8266 GPIO Pins

Whether you're a beginner or an experienced user, this ESP8266 pinout reference guide is a must-have resource. Learn which GPIO pins to use.

electropeak.com

Look at pin priority notes topics in above.


Regards, Dana.

 

[Harald Kapp]

Have you put the switch on the programming module back to UART mode after programming and performed a reset of the module (unplug from the USB port and plug it back again)?


The ESP will not run with the switch in Prog mode.

 

[Trior]

Problem solved. I wasn't flashing esp in the right flash mode. It should have been flashed in DOUT mode.