Increase buffer size possible?

RUI
1

Hello,

I’m currently trying to create my own code for sending UART messages on my RAK3172. I noticed that some bytes were missing even before sending, so I wrote a very simple code to check the Serial.read() function. I have noticed that at least 2 bytes are lost at every 128th position. I assume that this is due to a buffer size? Is it possible to fix this problem by maybe increasing the buffer size?

This is my code:

void setup() {
  Serial2.begin(115200, RAK_CUSTOM_MODE);
}

void loop() {
  while (Serial2.available()) {
    uint8_t c = Serial2.read();
    Serial2.printf("%c", c);
  }
}
2

The buffer size cannot be changed from the API side. It would require to change it directly in the BSP source code.

3

ok, is there any workaround to fix this issue? Or only in low level development?

4

Patching the existing RUI3 BSP or using directly STM32Cube ow level development are the options.
I don’t know whether STM32Cube provides functions or settings to use a larger UART buffer. Memory is very limited in the STM32WLE5.

5

Thank you, I will try that out! Is there an offline SDK or a sample build script for RAK3172 available?

6

RAK3172 WisDuo LoRaWAN Module Low Level Development Reference contains some basics, but how to use STM32CubeIDE or their MX??? thing, you have to look at STM32 for guides.

7

I found a workaround on this. I decreased the baudrate to 38400, then no bytes are lost

8

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