I2C Wire causes getMaxAllocHeap exception 'Interrupt wdt timeout' when reading more than 132 bytes

[bhcuong2008]

Board

ESP32 S3 ESP-4827S043

Device Description

Board HMI 4.3" with ESP32 S3 revision 0.1. I2C (pin 19 SDA, 20 SCL) connected to touch GT911.

Hardware Configuration

No.

Version

latest development Release Candidate (RC-X)

IDE Name

Arduino IDE

Operating System

Ubuntu Desktop 22.04

Flash frequency

80MHz

PSRAM enabled

yes

Upload speed

1152000

Description

The test based on WireMaster example. If reading bytes more than 132 bytes, Wire.requestFrom(I2C_DEV_ADDR, 133), then exception occurs if calling ESP.getMaxAllocHeap() after the call requestFrom anywhere in the program.

Arduino ESP32: 3.2.0-RC2, IDF 5.4
ESP32 S3 chip: revision 0.1

Sketch

#include "Wire.h"

#define I2C_DEV_ADDR 0x5D

uint32_t i = 0;

void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  Wire.begin(19, 20);
}

void loop() {
  delay(5000);

  //Write message to the slave
  Wire.beginTransmission(I2C_DEV_ADDR);
  Wire.write(0x8047 >> 8);
  Wire.write(0x8047 & 0x00ff);
  uint8_t error = Wire.endTransmission(true);
  Serial.printf("endTransmission: %u\n", error);

  //Read 16 bytes from the slave
  // 132 bytes is OK. 133 failed
  uint8_t bytesReceived = Wire.requestFrom(I2C_DEV_ADDR, 133);
  Serial.printf("requestFrom: %u\n", bytesReceived);
  if ((bool)bytesReceived) {  //If received more than zero bytes
    uint8_t temp[bytesReceived];
    Wire.readBytes(temp, bytesReceived);
    log_print_buf(temp, bytesReceived);
  }

  Serial.printf("Max alloc heap: %u\n", ESP.getMaxAllocHeap());
}

Debug Message

Guru Meditation Error: Core  0 panic'ed (Interrupt wdt timeout on CPU0).

Core  0 register dump:
PC      : 0x4202aad2  PS      : 0x00060833  A0      : 0x8202a9e7  A1      : 0x3fca4380  
A2      : 0xeb8465ec  A3      : 0x4202aa24  A4      : 0x3fca43e4  A5      : 0x3fca4400  
A6      : 0xeb8465f4  A7      : 0xeb8465f0  A8      : 0xabba1234  A9      : 0x3fca4360  
A10     : 0x00000001  A11     : 0xabba1234  A12     : 0x00000001  A13     : 0x3fca43e4  
A14     : 0x3fca4740  A15     : 0x0000cdcd  SAR     : 0x00000004  EXCCAUSE: 0x0000001c  
EXCVADDR: 0xeb8465f0  LBEG    : 0x400570e8  LEND    : 0x400570f3  LCOUNT  : 0x00000000  


Backtrace: 0x4202aacf:0x3fca4380 0x4202a9e4:0x3fca43a0 0x4202aa69:0x3fca43c0 0x4200bfef:0x3fca43e0 0x4200c03d:0x3fca4420 0x42002b6d:0x3fca4460 0x42001fe5:0x3fca4480 0x42007270:0x3fca44b0 0x4037d272:0x3fca44d0

Decoding stack results
0x4202aacf: tlsf_walk_pool at ... esp-idf/components/heap/tlsf/tlsf.c:211
0x4202a9e4: multi_heap_get_info_impl at ... esp-idf/components/heap/multi_heap.c:420
0x4202aa69: multi_heap_get_info at ... esp-idf/components/heap/multi_heap_poisoning.c:390
0x4200bfef: heap_caps_get_info at ... esp-idf/components/heap/heap_caps.c:375
0x4200c03d: heap_caps_get_largest_free_block at ... esp-idf/components/heap/heap_caps.c:304
0x42002b6d: EspClass::getMaxAllocHeap() at ... sketch/hardware/espressif/esp32/cores/esp32/Esp.cpp:149
0x42001fe5: loop() at ... sketch/WireMaster/WireMaster.ino:33
0x42007270: loopTask(void*) at ... sketch/hardware/espressif/esp32/cores/esp32/main.cpp:74
0x4037d272: vPortTaskWrapper at ... esp-idf/components/freertos/FreeRTOS-Kernel/portable/xtensa/port.c:139

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[Jason2866]

Looks like uint8_t is used but the underlying code does not handle more than 7 bits correctly.
So do not read more than the verified working.

[bhcuong2008]

I2C Wire is still working well to get data from touch GT911. Actually, in this library, https://github.com/TAMCTec/gt911-arduino/blob/main/TAMC_GT911.cpp, it reads up to 185 bytes. It causes exception only when calling getMaxAllocHeap.