Esp32c3 `Serial.baudRate()` is 2x too high

[s-hadinger]

Hardware:

Board: ESP32-C3-DevKitM-1
Core Installation version: 2.0.0 alpha1
IDE name: Platform.io
Flash Frequency: 40Mhz
PSRAM enabled: no
Upload Speed: 115200
Computer OS: Mac OSX

Description:

Describe your problem here

The baudrate returned by Serial.baudRate() is twice the expected value.

The Serial port is opened with 115200, but Serial.baudRate() returns ~230400.

Sketch: (leave the backquotes for code formatting)

#include <Arduino.h>

void setup() {
  Serial.begin(115200);
}

void loop() {
  Serial.printf(">> Serial baudrate: %d\n", Serial.baudRate());
  delay(1000);
}
// Output:
// >> Serial baudrate: 230423

[lbernstone]

Yes, uart needs to be rewritten. This should be a workaround until then:

#include <driver/uart.h>
void setup() {
  Serial.begin(115200);
  uint32_t br;
  uint8_t s_port = 0;
  uart_get_baudrate(s_port, &br);
  Serial.println(br);
}

[s-hadinger]

Thanks, this works fine.

[SuGlider]

UART is being refactored to be based on IDF and this issue shall be solved when it is released.