I2C - Wire Library crashing when setting clock frequency > 142857 Hz

[blackhack]

Board

ESP32 Dev Module

Device Description

ESP32 Dev Module, nothing connected.

Hardware Configuration

Just the bare board, it is not necessary to have an I2C device connected to reproduce the crash.

Version

latest master (checkout manually)

IDE Name

VSCode PlatformIO, Arduino IDE

Operating System

Windows 11

Flash frequency

80 MHz

PSRAM enabled

no

Upload speed

921600

Description

In the latest version with IDF 5.1, something has changed, and whenever we attempt to set the clock speed for the I2C bus to a value greater than 142857 Hz (e.g., 400 KHz), this assertion assert(scl_high > 13) fails.

Sketch

#include "Wire.h"

void setup() {
  Serial.begin(115200);
  Wire.begin();
  Wire.setClock(400000);
}

void loop() {
}

Debug Message

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0030,len:1416
load:0x40078000,len:14804
load:0x40080400,len:4
load:0x40080404,len:3356
entry 0x4008059c

assert failed: i2c_ll_set_bus_timing i2c_ll.h:109 (scl_high > 13)


Backtrace: 0x40082529:0x3ffb2080 0x40088335:0x3ffb20a0 0x4008d362:0x3ffb20c0 0x400da30e:0x3ffb21f0 0x400d229d:0x3ffb2210 0x400d163f:0x3ffb2240 0x400d145d:0x3ffb2260 0x400d333d:0x3ffb2290




ELF file SHA256: 067952623cffaa5f

Rebooting...
ets Jun  8 2016 00:22:57  

DECODED LOG:

#0  0x40082812:0x3ffb4f50 in panic_abort at C:\Users\david\.platformio\packages\framework-espidf\components\esp_system/panic.c:452
  #1  0x40087321:0x3ffb4f70 in esp_system_abort at C:\Users\david\.platformio\packages\framework-espidf\components\esp_system\port/esp_system_chip.c:84
  #2  0x4008cd8d:0x3ffb4f90 in __assert_func at C:\Users\david\.platformio\packages\framework-espidf\components\newlib/assert.c:81
  #3  0x400dbef0:0x3ffb50b0 in i2c_ll_set_bus_timing at C:\Users\david\.platformio\packages\framework-espidf\components\hal\esp32\include/hal/i2c_ll.h:109 (discriminator 1)
  #4  0x400dc10d:0x3ffb50d0 in i2c_hal_set_bus_timing at C:\Users\david\.platformio\packages\framework-espidf\components\hal/i2c_hal.c:36
  #5  0x400d1e58:0x3ffb5110 in i2cSetClock at C:/Users/david/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-i2c.c:370 (discriminator 4)
  #6  0x400d191f:0x3ffb5140 in TwoWire::setClock(unsigned long) at C:/Users/david/.platformio/packages/framework-arduinoespressif32/libraries/Wire/src/Wire.cpp:393
  #7  0x400d13f1:0x3ffb5160 in app_main at src/main.cpp:10
  #8  0x40089e40:0x3ffb5190 in main_task at C:\Users\david\.platformio\packages\framework-espidf\components\freertos/app_startup.c:208 (discriminator 13)
  #9  0x40089a49:0x3ffb51c0 in vPortTaskWrapper at C:\Users\david\.platformio\packages\framework-espidf\components\freertos\FreeRTOS-Kernel\portable\xtensa/port.c:162

Other Steps to Reproduce

It happens on normal Arduino core, and when use as IDF component.

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

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

[me-no-dev]

I can confirm this. You could get around it for now by starting the Wire with correct frequency Wire.begin(SDA, SCL, 400000);