ESP32 Forum

Hi ESP guys,

As a newbie of ESP32, I am working on setting up the UART as the debug interface of my board based on WROOM02, which has actually a ESP32 core. Both UARTs are connected via FTDI to USB and can be recognized as COM ports under Windows.

I have taken ESP8266_NONOS_SDK\examples\IoT_Demo as my starting point and chosen
no boot,
generate bin: eagle.flash.bin+eagle.irom0text.bin,
spi speed: 40 MHz,
spi mode: QIO,
spi size: 2048KB, and
spi ota map: 512KB + 512KB.

Well almost everything as default. And accordingly
#define PRIV_PARAM_START_SEC 0x7C
#define ESP_PARAM_START_SEC 0x7D

Compilation succeeds and flashing as well
eagle.flash.bin@0x00000
eagle.irom0text.bin@0x10000

Besides, I simply initialize the UART at the very beginning of user_init():
os_delay_us(1000000);
uart_init_2(BIT_RATE_115200, BIT_RATE_115200);
os_delay_us(1000000);
while(1)
{
uart_tx_one_char_no_wait(UART0, 'a');
uart_tx_one_char_no_wait(UART1, 'b');
}

I take uart_init_2, since it explicitly assigns the UART parameters like parity stop bit, etc.

However, after flashing and cycling power of my board, I can receive
nothing from UART1 and
Mojibake from UART0.

It would be nice, if someone could help me. Any suggestion is appreciated.

BR
AD

Erm, are you trying to compile ESP32 stuff using the ESP8266 toolchain/SDK? That's not going to work, compiling stuff for the ESP32 needs the ESP32 toolchain and esp-idf as a sdk.

Thanks a lot for your prompt reply and great hint!

I think I have landed in the wrong forum.
WROOM02 is based on ESP8266, which is a single core processor,
while ESP32 a dual core processor.

Fortunately I have followed the correct tutorial and taken a correct example project. For further question I think I need to turn to another forum.

Thanks again!