Description
Board
LOLIN 32
Device Description
LOLIN32
Hardware Configuration
Only Serial connected to PC using USB
Version
latest master
IDE Name
Sloeber Eclipse
Operating System
Window 10
Flash frequency
80 Mhz
PSRAM enabled
no
Upload speed
921600
Description
I have a 360 degree distance sensor which always outputs a data stream of 115200 baud.
When handling that datastream, an input FIFO can occour.
That is no problem as the messages have a crc so errors are detected by the protocol.
But what happens is that after the FIFO overflow, there are no more characters received from the Serial port.
I know I can increase the rxBufferSize, but that only makes the issue less frequent. I'd like to have a solid solution without the risk of hanging.
I would expect an overflow "only" gives loss of characters, but now it completely stops the uart from functioning.
Looks like the fifo error interrupt flag is not reset.
Checked in the 1.06 version, which uses uart directly (not using IDF).
In there on every interrupt the flag is reset uart->dev->int_clr.rxfifo_full = 1;
With that version all works as expected.
I used this small program to force the FIFO overflow, just send a larger message to the esp and it will trigger.
Any further input will only report another overflow
Sketch
#include "Arduino.h"
void setup()
{
Serial.begin(115200);
}
void loop()
{
if (Serial.available())
{
char c = Serial.read();
delay(1);
Serial.printf("%c",c);
}
}Debug Message
[↑☻☻☻??m◄um????2-hal-cpu.c:211] setCpuFrequencyMhz(): PLL: 480 / 2 = 240 Mhz, APB: 80000000 Hz
0
01234567890
1
01234567890
2
0123456789[ 4783][W][esp32-hal-uart.c:119] uart_event_task(): UART0 Buffer Full. Flushing data. Consider encreasing your buffer size of your Application.
0[ 4796][W][esp32-hal-uart.c:113] uart_event_task(): UART0 FIFO Overflow. Flushing data. Consider adding Flow Control to your Application.
[ 4808][W][esp32-hal-uart.c:113] uart_event_task(): UART0 FIFO Overflow. Flushing data. Consider adding Flow Control to your Application.
[ 4821][W][esp32-hal-uart.c:113] uart_event_task(): UART0 FIFO Overflow. Flushing data. Consider adding Flow Control to your Application.
### Other Steps to Reproduce
_No response_
### I have checked existing issues, online documentation and the Troubleshooting Guide
- [X] I confirm I have checked existing issues, online documentation and Troubleshooting guide.