driver_ds18b20_alarm.c

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#include "driver_ds18b20_alarm.h"
 
static ds18b20_handle_t gs_handle;        

uint8_t ds18b20_alarm_init(void)
{
    uint8_t res;
    
    /* link interface function */
    DRIVER_DS18B20_LINK_INIT(&gs_handle, ds18b20_handle_t);
    DRIVER_DS18B20_LINK_BUS_INIT(&gs_handle, ds18b20_interface_init);
    DRIVER_DS18B20_LINK_BUS_DEINIT(&gs_handle, ds18b20_interface_deinit);
    DRIVER_DS18B20_LINK_BUS_READ(&gs_handle, ds18b20_interface_read);
    DRIVER_DS18B20_LINK_BUS_WRITE(&gs_handle, ds18b20_interface_write);
    DRIVER_DS18B20_LINK_DELAY_MS(&gs_handle, ds18b20_interface_delay_ms);
    DRIVER_DS18B20_LINK_DELAY_US(&gs_handle, ds18b20_interface_delay_us);
    DRIVER_DS18B20_LINK_ENABLE_IRQ(&gs_handle, ds18b20_interface_enable_irq);
    DRIVER_DS18B20_LINK_DISABLE_IRQ(&gs_handle, ds18b20_interface_disable_irq);
    DRIVER_DS18B20_LINK_DEBUG_PRINT(&gs_handle, ds18b20_interface_debug_print);
    
    /* ds18b20 init */
    res = ds18b20_init(&gs_handle);
    if (res != 0)
    {
        ds18b20_interface_debug_print("ds18b20: init failed.\n");
        
        return 1;
    }   
    
    /* set match rom mode */
    res = ds18b20_set_mode(&gs_handle, DS18B20_MODE_MATCH_ROM);
    if (res != 0)
    {
        ds18b20_interface_debug_print("ds18b20: set mode failed.\n");
        (void)ds18b20_deinit(&gs_handle);
        
        return 1;
    }
    
    return 0;
}

uint8_t ds18b20_alarm_set_threshold(uint8_t rom[8], float low, float high)
{
    uint8_t res;
    int8_t threshold_high;
    int8_t threshold_low;
    
    /* set rom */
    res = ds18b20_set_rom(&gs_handle, (uint8_t *)rom);
    if (res != 0)
    {
        return 1;
    }
    
    /* convert high threshold */
    res = ds18b20_alarm_convert_to_register(&gs_handle, high, (int8_t *)&threshold_high);
    if (res != 0)
    {
        return 1;
    }
    
    /* convert low threshold */
    res = ds18b20_alarm_convert_to_register(&gs_handle, low, (int8_t *)&threshold_low);
    if (res != 0)
    {
        return 1;
    }
    
    /* set alarm threshold */
    res = ds18b20_scratchpad_set_alarm_threshold(&gs_handle, threshold_high, threshold_low);
    if (res != 0)
    {
        return 1;
    }
    
    return 0;
}

uint8_t ds18b20_alarm_get_threshold(uint8_t rom[8], float *low, float *high)
{
    uint8_t res;
    int8_t threshold_high;
    int8_t threshold_low;
    
    /* set rom */
    res = ds18b20_set_rom(&gs_handle, (uint8_t *)rom);
    if (res != 0)
    {
        return 1;
    }
    
    /* get alarm threshold */
    res = ds18b20_scrachpad_get_alarm_threshold(&gs_handle, (int8_t *)&threshold_high, (int8_t *)&threshold_low);
    if (res != 0)
    {
        return 1;
    }
    
    /* convert low threshold */
    res = ds18b20_alarm_convert_to_data(&gs_handle, threshold_low, low);
    if (res != 0)
    {
        return 1;
    }
    
    /* convert high threshold */
    res = ds18b20_alarm_convert_to_data(&gs_handle, threshold_high, high);
    if (res != 0)
    {
        return 1;
    }
    
    return 0;
}

uint8_t ds18b20_alarm_search(uint8_t (*rom)[8], uint8_t *num)
{
    /* search alarm */
    if (ds18b20_search_alarm(&gs_handle, rom, num) != 0)
    {
        return 1;
    }
    else
    {
        return 0;
    }
}

uint8_t ds18b20_alarm_deinit(void)
{
    /* ds18b20 close */
    if (ds18b20_deinit(&gs_handle) != 0)
    {
        return 1;
    }
    else
    {
        return 0;
    }
}