ttss_weight/source/bsp/backu/bsp_iic3.c

#include "bsp_iic3.h"
///#include "gplib.h"

#define SC7A20_SLAVE_ID    0x32//0x4E ,erichan 20150529

	 #define G_SlaveAddr SC7A20_SLAVE_ID
static INT8U g_level;

static OS_EVENT		*sw_i2c_sem = NULL;

static INT8U G_sensor_status=0;

//====================================================================================================
void I2C_delay (
	INT16U i
) {
	INT16U j;

	for (j=0;j<(i<<8);j++)
		i=i;
}

void g_delay(INT16U i)
{
	INT16U k;
	
	for(k=0;k<i;k++)
		I2C_delay(100);
}
	

//============================================
void I2C_start (void)
{
	gpio_write_io(I2C_SCL, DATA_HIGH);					//SCL1
	I2C_delay (1);
	gpio_write_io(I2C_SDA, DATA_HIGH);					//SDA1
	I2C_delay (1);
	gpio_write_io(I2C_SDA, DATA_LOW);					//SDA0
	I2C_delay (1);
}
//===================================================================
void I2C_stop (void)
{
	I2C_delay (1);
	gpio_write_io(I2C_SDA, DATA_LOW);					//SDA0
	I2C_delay (1);
	gpio_write_io(I2C_SCL, DATA_HIGH);					//SCL1
	I2C_delay (1);
	gpio_write_io(I2C_SDA, DATA_HIGH);					//SDA1
	I2C_delay (1);
}


//===================================================================
void I2C_w_phase (INT16U value)
{
	INT16U i;

	for (i=0;i<8;i++)
	{
		gpio_write_io(I2C_SCL, DATA_LOW);					//SCL0
		I2C_delay (1);
		if (value & 0x80)
			gpio_write_io(I2C_SDA, DATA_HIGH);				//SDA1
		else
			gpio_write_io(I2C_SDA, DATA_LOW);				//SDA0
//		sccb_delay (1);
		gpio_write_io(I2C_SCL, DATA_HIGH);					//SCL1
		I2C_delay(1);
		value <<= 1;
	}
	// The 9th bit transmission
	gpio_write_io(I2C_SCL, DATA_LOW);						//SCL0
	gpio_init_io(I2C_SDA, GPIO_INPUT);						//SDA is Hi-Z mode
	I2C_delay(1);
	gpio_write_io(I2C_SCL, DATA_HIGH);						//SCL1
	I2C_delay(1);
	gpio_write_io(I2C_SCL, DATA_LOW);						//SCL0
	gpio_init_io(I2C_SDA, GPIO_OUTPUT);					//SDA is Hi-Z mode
}

//===================================================================
INT16U I2C_r_phase (void)
{
	INT16U i;
	INT16U data;

	gpio_init_io(I2C_SDA, GPIO_INPUT);						//SDA is Hi-Z mode
	data = 0x00;
	for (i=0;i<8;i++)
	{
		gpio_write_io(I2C_SCL, DATA_LOW);					//SCL0
		I2C_delay(1);
		gpio_write_io(I2C_SCL, DATA_HIGH);					//SCL1
		data <<= 1;
		data |=( gpio_read_io(I2C_SDA));
		I2C_delay(1);
	}
	// The 9th bit transmission
	gpio_write_io(I2C_SCL, DATA_LOW);						//SCL0
	gpio_init_io(I2C_SDA, GPIO_OUTPUT);					//SDA is output mode
	gpio_write_io(I2C_SDA, DATA_HIGH);						//SDA0, the nighth bit is NA must be 1
	I2C_delay(1);
	gpio_write_io(I2C_SCL, DATA_HIGH);						//SCL1
	I2C_delay(1);
	gpio_write_io(I2C_SCL, DATA_LOW);						//SCL0
	return data;
}

//====================================================================================================
void I2C_gpio_init (
	INT32U nSCL,			// Clock Port No
	INT32U nSDA				// Data Port No
){
	//init IO
	gpio_set_port_attribute(nSCL, ATTRIBUTE_HIGH);
	gpio_set_port_attribute(nSDA, ATTRIBUTE_HIGH);
	gpio_init_io(nSCL, GPIO_OUTPUT);				//set dir
	gpio_init_io(nSDA, GPIO_OUTPUT);				//set dir
	gpio_write_io(nSCL, DATA_HIGH);					//SCL1
	gpio_write_io(nSDA, DATA_HIGH);					//SDA0
}



void g_sensor_write(INT8U id, INT8U addr, INT8U data)
{
	// 3-Phase write transmission cycle is starting now ...
	I2C_start();									// Transmission start
	I2C_w_phase(id);								// Phase 1: Device ID
	I2C_w_phase(addr);								// Phase 2: Register address. High pass filter enable
	I2C_w_phase(data);								// Phase 3: Data value
	I2C_stop();									// Transmission stop
}

INT16U g_sensor_read(INT8U id, INT8U addr)
{
	INT16U redata;
	
	I2C_start();									// Transmission start
	I2C_w_phase(id);								// Phase 1: Device ID
	I2C_w_phase(addr);								// Phase 2: Register address. Transient source
	I2C_start();									// Transmission start
	I2C_w_phase(id | 0x01);						// Phase 1 (read)
	redata = (INT8U) I2C_r_phase();				// Phase 2
	I2C_stop();									// Transmission stop

   return redata;
}

void sw_i2c_lock(void)
{
	INT8U err;

	OSSemPend(sw_i2c_sem, 0, &err);
}

void sw_i2c_unlock(void)
{
	OSSemPost(sw_i2c_sem);
}