i2c bus reset signal in 28335

Have you tried using the free data format? It lets you send arbitrary data at the start of a transfer. Sections 2.5.3 and 2.5.4 of the F2833x I2C guide have the information you need. It's literature number SPRUG03.

Thanks for your reply, Mr. Haun.

I'll try it later.

Currently, I implemented that using GPIO handling.

that is the code.:

void	gpio_I2C_bus_reset(void)
{
	register U16	n;
	gpio_release_I2C();

	// I2C start. START_SETUP, HOLD, LOW
	GPIO_SDAA = 1;
	GPIO_SCLA = 1;
	DELAY_US(GPIO_I2C_START_SETUP_TIME_US);
	GPIO_SDAA = 0;
	DELAY_US(GPIO_I2C_START_HOLD_TIME_US);
	GPIO_SCLA = 0;
	//_nop();

	// data
	n = 9;	// nine 1.
	while( n )
	{
		// data 1.
		GPIO_SDAA = 1;
		DELAY_US(GPIO_I2C_LOW_TIME_US);
		GPIO_SCLA = 1;
		DELAY_US(GPIO_I2C_HIGH_TIME_US);
		GPIO_SCLA = 0;
		n--;
	}

	DELAY_US(GPIO_I2C_LOW_TIME_US);

	// I2C start
	GPIO_SDAA= 1;
	GPIO_SCLA = 1;
	DELAY_US(GPIO_I2C_START_SETUP_TIME_US);
	GPIO_SDAA = 0;
	DELAY_US(GPIO_I2C_START_HOLD_TIME_US);
	GPIO_SCLA = 0;
	//_nop();

	DELAY_US(GPIO_I2C_LOW_TIME_US);

	// I2C stop
	// GPIO_SCLA = 0;
	// GPIO_SDAA = 0;
	GPIO_SCLA = 1;
	DELAY_US(GPIO_I2C_STOP_SETUP_TIME_US);
	GPIO_SDAA = 1;
	DELAY_US(GPIO_I2C_BUS_FREE_TIME_US);
	
	// gpio default & input
	GPIO_SDAA = 1;
	GPIO_SCLA = 1;
	
	EALLOW;
	GPIO_SDAA_DIR = 0;
	GPIO_SCLA_DIR = 0;
	EDIS;
}

It works. But, this code can be only used at booting time with DINT.

Nice day!

Cheolhyeon Jo,