I2C failure in C++ after add std::vector to code (IDFGH-4463)

[Metmacher]

Environment

• Development Kit: ESP32-DevKitC
• Kit version (for WroverKit/PicoKit/DevKitC): unknow
• Module or chip used: ESP32-WROOM-32
• IDF version (run git describe --tags to find it): v4.3-dev-2136-gb0150615d
• Build System: idf.py
• Compiler version (run xtensa-esp32-elf-gcc --version to find it): 8.4.0
• Operating System: Linux
• Using an IDE?: VSCode
• Power Supply: USB

Problem Description

I setup an program for communication with I2C in C++. After add an std::vector, the I2C communication failed, here an mini example for reproduce:

#include "driver/gpio.h"
#include "driver/i2c.h"
#include "freertos/task.h"
#include "sdkconfig.h" // generated by "make menuconfig"
#include <vector>

extern "C"
{
	void app_main();
}

void init_I2C()
{
	i2c_config_t i2c_config;
	i2c_config.mode = I2C_MODE_MASTER;
	i2c_config.sda_io_num = GPIO_NUM_17;
	i2c_config.scl_io_num = GPIO_NUM_16;
	i2c_config.sda_pullup_en = GPIO_PULLUP_ENABLE;
	i2c_config.scl_pullup_en = GPIO_PULLUP_ENABLE;
	i2c_config.master.clk_speed = 100000;
	i2c_param_config(I2C_NUM_0, &i2c_config);
	i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, 0, 0, 0);
}

void app_main(void)
{
	init_I2C();
	std::vector<std::vector<uint8_t>> tmpData; // this brings trouble
}

The monitor output:

I (307) spi_flash: flash io: dio
I (312) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
E (322) i2c: i2c_param_config(644): i2c clock choice is invalid, please check flag and frequency

If I also run my full program, and try communication on this interface this error will also prompted:

E (1344) i2c: i2c_set_pin(825): scl and sda gpio numbers are the same

If the vector is removed, the error didn't occur.

[Alvin1Zhang]

Thanks for reporting and letting us know, we will look into.

[boarchuz]

4.3 adds 'clk_flags' field to i2c_config_t. You need to zero i2c_config_t or set clk_flags.

[Metmacher]

You need to zero i2c_config_t or set clk_flags.

Solved it!
Solution: add i2c_config.clk_flags = 0; to the config section.

4.3 adds 'clk_flags' field to i2c_config_t.

I checked out version 4.2 and there the initial code is working.

@boarchuz thank you