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834 linlun 1 
/*
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 * FOST02 temperature and humidity sensor
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 *
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 * Using "two-wire" interface for reading sensor values.
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 *
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 * Author: Linus Lundin
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 * Date: 2007-08-12
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 *
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 */
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/*-----------------------------------------------
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 * Includes
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 * ---------------------------------------------*/
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#include <avr/io.h>
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#include <stdio.h>
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#include <stdlib.h>
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1932 arune 18 
#include <config.h>
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#include <util/delay.h>
834 linlun 20 
#include "FOST02.h"
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/*----------------------------------------------
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 * Functions
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 * --------------------------------------------*/
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/*
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 * Initiate FOST02 for reading temperature and humidity from sensor.
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 */
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void FOST02Init(void)
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{
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    gpio_clr_pin(FOST02_CLK);
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    gpio_set_out(FOST02_CLK);  
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    gpio_set_in(FOST02_DATA);
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    gpio_clr_pin(FOST02_DATA);
834 linlun 36 
}
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void sendReset(void)
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{
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    gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
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    _delay_us(2);
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    gpio_set_in(FOST02_DATA); // set 0 in DDR line: Data = 1 (data line = input)
1896 arune 42 
    _delay_us(2);
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    gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
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    _delay_us(2);
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    gpio_set_out(FOST02_DATA); //set 1 in DDR line Data = 0 (data line = output)
1896 arune 46 
    _delay_us(2);
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    gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
1896 arune 48 
    _delay_us(2);
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    gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
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    _delay_us(2);
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    gpio_set_in(FOST02_DATA); // set 0 in DDR line: Data = 1 (data line = input)
1896 arune 52 
    _delay_us(2);
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    gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
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    _delay_us(2);
834 linlun 55 
}
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uint8_t sendCommand(uint8_t cmd)
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{
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    sendReset();
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    uint8_t i,ret;
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    for (i = 0; i<8 ; i++)
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    {
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        if ((cmd & 0x80) == 0x80)
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            gpio_set_in(FOST02_DATA); // set 0 in DDR line: Data = 1 (data line = input)
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        else
1140 linlun 65 
            gpio_set_out(FOST02_DATA); //set 1 in DDR line Data = 0 (data line = output)
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        _delay_us(2);
1140 linlun 67 
        gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
834 linlun 68 
        cmd = cmd << 1;
1896 arune 69 
        _delay_us(2);
1140 linlun 70 
        gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
1896 arune 71 
        _delay_us(2);
834 linlun 72 
    }
1140 linlun 73 
    gpio_set_in(FOST02_DATA); // set 0 in DDR line: Data = 1 (data line = input)
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    _delay_us(2);
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    gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
834 linlun 76 
 
1896 arune 77 
    _delay_us(2);
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    if ( !gpio_get_state(FOST02_DATA))
834 linlun 79 
    {
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        ret = 1;
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        gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
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        _delay_us(2);
1140 linlun 83 
        gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
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        while (!gpio_get_state(FOST02_DATA));
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        _delay_us(2);
834 linlun 86 
    }
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    else
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        ret = 0;
1140 linlun 89 
    gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
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    _delay_us(2);
834 linlun 91 
    return ret;
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}
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uint8_t getFOST02PinStatus(void)
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{
1140 linlun 96 
    if ( gpio_get_state(FOST02_DATA))
834 linlun 97 
        return 1;
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    else
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        return 0;
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}
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uint16_t getFOST02Data(void)
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{
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    uint8_t i,data1, data2;
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    uint16_t data = 0;
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    data=0;
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    data1=0;
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    data2=0;
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    for (i = 0; i<8 ; i++)
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    {
1140 linlun 110 
        gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
1896 arune 111 
        _delay_us(2);
834 linlun 112 
        data1 = data1 << 1;
1140 linlun 113 
        if ( gpio_get_state(FOST02_DATA))
834 linlun 114 
            data1 = data1 | 0x0001;
1140 linlun 115 
        gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
1896 arune 116 
        _delay_us(2);
834 linlun 117 
    }
1140 linlun 118 
    gpio_set_out(FOST02_DATA); //set 1 in DDR line Data = 0 (data line = output)
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    _delay_us(2);
1140 linlun 120 
    gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
1896 arune 121 
    _delay_us(2);
1140 linlun 122 
    gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
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    gpio_set_in(FOST02_DATA); // set 0 in DDR line: Data = 1 (data line = input)
1896 arune 124 
    _delay_us(2);
834 linlun 125 
    for (i = 0; i<8 ; i++)
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    {
1140 linlun 127 
        gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
1896 arune 128 
        _delay_us(2);
834 linlun 129 
        data2 = data2 << 1;
1140 linlun 130 
        if ( gpio_get_state(FOST02_DATA))
834 linlun 131 
            data2 = data2 | 0x0001;
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        gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
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        _delay_us(2);
834 linlun 134 
    }
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    //skip Ack
1140 linlun 136 
    gpio_set_in(FOST02_DATA); // set 0 in DDR line: Data = 1 (data line = input)
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    _delay_us(2);
1140 linlun 138 
    gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
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    _delay_us(2);
1140 linlun 140 
    gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
834 linlun 141 
    data = (uint16_t) (data1<<8);
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    data += data2;
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    return data;
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}
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void getFOST02DataByte(uint8_t *data1in, uint8_t *data2in)
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{
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    uint8_t i;
149 
    uint16_t data = 0;
150 
    uint8_t data1 = 0;
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    uint8_t data2 = 0;
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    for (i = 0; i<8 ; i++)
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    {
1140 linlun 154 
        gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
1896 arune 155 
        _delay_us(2);
834 linlun 156 
        data1 = data1 << 1;
1140 linlun 157 
        if ( gpio_get_state(FOST02_DATA))
834 linlun 158 
            data1 = data1 | 0x0001;
1140 linlun 159 
        gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
1896 arune 160 
        _delay_us(2);
834 linlun 161 
    }
1140 linlun 162 
    gpio_set_out(FOST02_DATA); //set 1 in DDR line Data = 0 (data line = output)
1896 arune 163 
    _delay_us(2);
1140 linlun 164 
    gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
1896 arune 165 
    _delay_us(2);
1140 linlun 166 
    gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
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    gpio_set_in(FOST02_DATA); // set 0 in DDR line: Data = 1 (data line = input)
1896 arune 168 
    _delay_us(2);
834 linlun 169 
    for (i = 0; i<8 ; i++)
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    {
1140 linlun 171 
        gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
1896 arune 172 
        _delay_us(2);
834 linlun 173 
        data2 = data2 << 1;
1140 linlun 174 
        if ( gpio_get_state(FOST02_DATA))
834 linlun 175 
            data2 = data2 | 0x0001;
1140 linlun 176 
        gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
1896 arune 177 
        _delay_us(2);
834 linlun 178 
    }
179 
    //skip Ack
1140 linlun 180 
    gpio_set_in(FOST02_DATA); // set 0 in DDR line: Data = 1 (data line = input)
1896 arune 181 
    _delay_us(2);
1140 linlun 182 
    gpio_set_pin(FOST02_CLK); //set 1 in FOST_CLK
1896 arune 183 
    _delay_us(2);
1140 linlun 184 
    gpio_clr_pin(FOST02_CLK); //set 0 in FOST_CLK
834 linlun 185 
    *data1in = data1;
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    *data2in = data2;
187 
}
188 
/*
189 
 * Start reading and return the temperature value.
190 
 */
191 
void measureFOST02temperature(void) {}
192 
void measureFOST02humidity(void) {}
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uint16_t getFOST02temperature(void) {return 0;}
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uint16_t getFOST02humidity(void) {return 0;}