open-ameba/RTL00_SDKV35a/example_sources/i2c_LPS25HB_pressure/src/main.c

#include "device.h"
#include "PinNames.h"

#include "basic_types.h"
#include "diag.h" 
#include "osdep_api.h"

#include "i2c_api.h"
#include "pinmap.h"
//#include "rtl_lib.h"
#include "main.h"

#define MBED_I2C_MTR_SDA    PB_3
#define MBED_I2C_MTR_SCL    PB_2
#define MBED_I2C_INTB		PA_5
#define MBED_I2C_SLAVE_ADDR0    0x5D
#define MBED_I2C_BUS_CLK        40000  //hz
#define I2C_DATA_MAX_LENGTH     20
#define malloc pvPortMalloc
#define free vPortFree

uint8_t i2cdata_write[I2C_DATA_MAX_LENGTH];
uint8_t i2cdata_read[I2C_DATA_MAX_LENGTH];
uint16_t cmd;

i2c_t   i2cmaster;
int count = 0;
//sensor command        
#define SENSOR_START 0x20A0
#define FIFO 0x2E41
#define REBOOT 0x2110
#define READ 0x2101
#define BYPASS 0x2E00


char    i2cdatasrc[9] = {0x27, 0x28, 0x29, 0x2A};
//char    i2cdatasrc[7] = {0x40, 0x48, 0x50, 0x27, 0x28, 0x29, 0x2A};


static void ePL_WriteCommand(uint16_t cmd)
{
	i2cdata_write[0] = (uint8_t)(cmd >>8);
	i2cdata_write[1] = (uint8_t)(cmd&0xFF);
  	i2c_write(&i2cmaster, MBED_I2C_SLAVE_ADDR0, &i2cdata_write[0], 2, 1);   
}  
/*
struct node
{
    int info;
    struct node *ptr;
}*front,*rear,*temp,*front1;
*/
//int frontelement();
//void enq(int data);
//void deq();
/*
void enq(int data)
{
    if (rear == NULL)
    {
        rear = (struct node *)malloc(1*sizeof(struct node));
        if(rear == NULL)
        {
              printf("\n\rmalloc rear failed!\n");
              return;
        }
        rear->ptr = NULL;
        rear->info = data;
        front = rear;
        //printf("front info: %d\n", front->info);
    }
    else
    {
        temp=(struct node *)malloc(1*sizeof(struct node));
        rear->ptr = temp;
        temp->info = data;
        temp->ptr = NULL;
 
        rear = temp;
        //printf("rear info: %d\n", rear->info);
    }
    count++;
}

void deq()
{
    front1 = front;
    //printf("front info before deq: %d\n", front->info);
    if (front1 == NULL)
    {
        printf("Error: Trying to display elements from empty queue\n");
        return;
    }
    else
    {
        if (front1->ptr != NULL)
        {
            front1 = front1->ptr;
            //printf("\nDequed value : %d\n", front->info);
            free(front);
            front = front1;
        }
        else
        {
            //printf("\nDequed value : %d\n", front->info);
            free(front);
            front = NULL;
            rear = NULL;
        }
        count--;
    }
}
*/
void main(void)
{
        int result;
        int i, data;
        int temprature;
        int flag = 0;
        int sum = 0;
        int average = 0;
        struct node *output;
        char intertupt;
        
	DiagPrintf("Sensor_Init \r\n");
        //for(i=0; i<16; i++)
          //printf("ouput before: %d\n", i2cdata_read[i]);
	i2c_init(&i2cmaster, MBED_I2C_MTR_SDA ,MBED_I2C_MTR_SCL);
	i2c_frequency(&i2cmaster,MBED_I2C_BUS_CLK);
        
        ePL_WriteCommand(SENSOR_START);
        ePL_WriteCommand(REBOOT);
        //ePL_WriteCommand(BYPASS);

        while(1){
            //i2c_write(&i2cmaster, MBED_I2C_SLAVE_ADDR0, &i2cdatasrc[3], 1, 1);  
            //i2c_read(&i2cmaster, MBED_I2C_SLAVE_ADDR0, (char*)&i2cdata_read[3], 2, 1);
            //printf("Status Reg: %d\n", i2cdata_read[3]);
            i2c_write(&i2cmaster, MBED_I2C_SLAVE_ADDR0, &i2cdatasrc[1], 1, 1);  
            i2c_read(&i2cmaster, MBED_I2C_SLAVE_ADDR0, (char*)&i2cdata_read[1], 2, 1);
            //printf("--------pressure output LSB: %d\n", i2cdata_read[4]);
            i2c_write(&i2cmaster, MBED_I2C_SLAVE_ADDR0, &i2cdatasrc[2], 1, 1);  
            i2c_read(&i2cmaster, MBED_I2C_SLAVE_ADDR0, (char*)&i2cdata_read[2], 2, 1);
            //printf("--------pressure output MID: %d\n", i2cdata_read[5]);
            i2c_write(&i2cmaster, MBED_I2C_SLAVE_ADDR0, &i2cdatasrc[3], 1, 1);  
            i2c_read(&i2cmaster, MBED_I2C_SLAVE_ADDR0, (char*)&i2cdata_read[3], 2, 1);
            //printf("--------pressure output MSB: %d\n", i2cdata_read[6]);
            Mdelay(2000);
            data = (i2cdata_read[3]*256*256*100+i2cdata_read[2]*256*100+i2cdata_read[1]*100)/4128;       
            printf("pressure: %dPa\n", data);
            /*
            if(count == 20)
            {
              deq();    
            }
            enq(data);
            output = front;
            sum = front->info;
            while(output->ptr != NULL)
            {          
              output = output->ptr;
              sum = sum + output->info; 
            }
            
            //printf("------count = %d---------\n", count);
            average = sum / count;
            //printf("---final output: %d---\n", average);
            */
            
          }
        
        Mdelay(1000);
        
        }