Embedded-Graphics/software/firmware/oracle_same54n19a/shared/drivers/p_i2c.c

#include "p_i2c.h"
#include "p_usart.h"
#include "hal_init.h"
#include "pc_board.h"


struct i2c_m_sync_desc p_i2c_master;

void p_i2c_init(void)
{
	// clock init
	hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM3_GCLK_ID_CORE, CONF_GCLK_SERCOM3_CORE_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
	hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM3_GCLK_ID_SLOW, CONF_GCLK_SERCOM3_SLOW_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));

	hri_mclk_set_APBBMASK_SERCOM3_bit(MCLK);
	
	i2c_m_sync_init(&p_i2c_master, SERCOM3);
	
	// port init
	gpio_set_pin_pull_mode(I2C_MASTER_SDA,
	                       // <y> Pull configuration
	                       // <id> pad_pull_config
	                       // <GPIO_PULL_OFF"> Off
	                       // <GPIO_PULL_UP"> Pull-up
	                       // <GPIO_PULL_DOWN"> Pull-down
	                       GPIO_PULL_OFF);

	gpio_set_pin_function(I2C_MASTER_SDA, I2C_MASTER_SDA_MUX);

	gpio_set_pin_pull_mode(I2C_MASTER_SCL,
	                       // <y> Pull configuration
	                       // <id> pad_pull_config
	                       // <GPIO_PULL_OFF"> Off
	                       // <GPIO_PULL_UP"> Pull-up
	                       // <GPIO_PULL_DOWN"> Pull-down
	                       GPIO_PULL_OFF);

	gpio_set_pin_function(I2C_MASTER_SCL, I2C_MASTER_SCL_MUX);
	
	i2c_m_sync_enable(&p_i2c_master);
}

int p_i2c_write(const uint8_t* const data, uint16_t data_len)
{
	return io_write(&p_i2c_master.io, data, data_len);
}

int p_i2c_read(uint8_t* data, uint16_t len)
{
	return io_read(&p_i2c_master.io, data, len);
}

void p_i2c_detect(void)
{
	PDEBUG("   ");
	for(int ind = 0; ind < 16; ind++)
	{
		PDEBUG(" %02x", ind);
	}
	uint8_t data = 0x00;
	for(int ind = 0; ind <= 119; ind++)
	{
		if (ind % 16 == 0)
		{
			PDEBUG("\r\n%02x:", ind & 0xF0);
		}
		i2c_m_sync_set_slaveaddr(&p_i2c_master, ind, I2C_M_SEVEN);
		int ret = p_i2c_write(&data, 1);
		if(ret != 1)
		{
			PDEBUG(" --");
		}
		else
		{
			PDEBUG(" %02x", ind);
		}
	}
	PDEBUG("\r\n");
}