Inquirty about Rx and Tx pin numbers for ESP32-S3 DevKitC-1N16R8 Board

dallim30 · September 26, 2024, 3:01am

Hi

I am currently working on a project using the ESP32-S3-DevKitC-1-N16R8 development board.
I need to confirm the RX and TX pin numbers for the serial ports (Serial, Serial1, and Serial2) on this board.

Could you please provide me with the specific pin numbers for each of these serial ports?
Additionally, if there is any official documentation or a reference guide that details this information, I would greatly appreciate it if you could share the link or the document with me.

Thank you very much for your assistance.

Best regards,

sjkim

sivar2311 · September 26, 2024, 4:47am

See

github.com

espressif/arduino-esp32/blob/release/v2.x/cores/esp32/HardwareSerial.h#L117-L182


      
          #ifndef SOC_RX0
            #if CONFIG_IDF_TARGET_ESP32
              #define SOC_RX0 (gpio_num_t)3
            #elif CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
              #define SOC_RX0 (gpio_num_t)44
            #elif CONFIG_IDF_TARGET_ESP32C3
              #define SOC_RX0 (gpio_num_t)20
            #endif
          #endif
          
          #ifndef SOC_TX0
            #if CONFIG_IDF_TARGET_ESP32
              #define SOC_TX0 (gpio_num_t)1
            #elif CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
              #define SOC_TX0 (gpio_num_t)43
            #elif CONFIG_IDF_TARGET_ESP32C3
              #define SOC_TX0 (gpio_num_t)21
            #endif
          #endif

This file has been truncated. show original

which leads to the GPIO numbers

Serial / Serial0
RX0 = 44
TX0 = 43

Serial1
RX1 = 15
TX1 = 16

Serial2
RX2 = 19
TX2 = 20

sivar2311 · September 27, 2024, 10:39am

@thomas642daniel Can you provide a source for this?

The GPIO’s look more like the ones for the ESP32 (without S3) to me.

MCU	UART	RX GPIO	TX GPIO	Note
ESP32	UART0	3	1	`Serial`
	UART1	9	10	`Serial1`
	UART2	16	17	`Serial2`
ESP32-S2	UART0	44	43	`Serial` or `Serial0` `(*)`
	UART1	18	17	`Serial1`
ESP32-S3	UART0	44	43	`Serial` or `Serial0` `(*)`
	UART1	15	16	`Serial1`
	UART2	19	20	`Serial2`
ESP32-C3	UART0	20	21	`Serial` or `Serial0` `(*)`
	UART1	18	19	`Serial1`

(*) depends on ARDUINO_USB_CDC_ON_BOOT - See ESP32-S3 native USB interface and Serial Monitor missing first messages - #10 by sivar2311

andrewknockin · September 27, 2024, 7:39pm

@dallim30
https://docs.espressif.com/projects/esp-idf/en/stable/esp32s3/hw-reference/esp32s3/user-guide-devkitc-1.html
Scroll down to the image labelled Pin Layout near the end of this official Espressif page.
At the top right you will see U0TXD is GPIO43 and U0RXD is GPIO44, and middle of the other side shows U1TXD is GPIO17 and U1RXD is GPIO18. I think these are the same numbers @sivar2311 quoted.
In my experience, it seems necessary to use those dark green GPIO numbers in your Arduino code for the ESP32-S3 rather than pin numbers.

sivar2311 · September 30, 2024, 5:47am

@thomas642daniel Sorry, but your answers sound like an A.I. chatbot!