usb_key.c

ATMEL at90usb128 usb HID source code for win-avr

//! @file usb_key.c,v
//!
//! Copyright (c) 2006 Atmel.
//!
//! Please read file license.txt for copyright notice.
//!
//! @brief This file contains the low level functions for USB KEY hardware
//!
//! @version 1.3 at90usb128-demo-hidgen-std-2_0_0 $Id: usb_key.c,v 1.3 2006/03/14 15:36:06 rletendu Exp $
//!
//! @todo
//! @bug

//_____  I N C L U D E S ___________________________________________________

#include "config.h"
#include "usb_key.h"

#ifdef USE_ADC       //!< this define is set on config.h file
#include "lib_mcu\adc\adc_drv.h"

//_____ M A C R O S ________________________________________________________


//_____ P R I V A T E    D E C L A R A T I O N _____________________________


//_____ D E F I N I T I O N ________________________________________________

//! The following table give the correspondance between the ADC code and the temperature
//! Each elements of the table corresponds to an ADC code value.
//! The index in the table give the corresponding temperature (in癈) with
//! the following formula : Tempeature=index-20.
//! table[O] corresponds to -20癈 temperature code
//! The following table gives the ADC code for VCC=3.3V and Aref=AVcc
code U16 temperature_code[]={  0x3B4,0x3B0,0x3AB,0x3A6,0x3A0,0x39A,0x394,0x38E,0x388,0x381,0x37A,0x373,
   0x36B,0x363,0x35B,0x353,0x34A,0x341,0x338,0x32F,0x325,0x31B,0x311,0x307,
   0x2FC,0x2F1,0x2E6,0x2DB,0x2D0,0x2C4,0x2B8,0x2AC,0x2A0,0x294,0x288,0x27C,
   0x26F,0x263,0x256,0x24A,0x23D,0x231,0x225,0x218,0x20C,0x200,0x1F3,0x1E7,
   0x1DB,0x1CF,0x1C4,0x1B8,0x1AC,0x1A1,0x196,0x18B,0x180,0x176,0x16B,0x161,
   0x157,0x14D,0x144,0x13A,0x131,0x128,0x11F,0x117,0x10F,0x106,0xFE,0xF7,
   0xEF,0xE8,0xE1,0xDA,0xD3,0xCD,0xC7,0xC0,0xBA,0xB5,0xAF,0xAA,0xA4,0x9F,
   0x9A,0x96,0x91,0x8C,0x88,0x84,0x80,0x7C,0x78,0x74,0x71,0x6D,0x6A,0x67,
   0x64,0x61,0x5E,0x5B,0x58,0x55,0x53,0x50,0x4E,0x4C,0x49,0x47,0x45,0x43,
   0x41,0x3F,0x3D,0x3C,0x3A,0x38};


//_____ D E C L A R A T I O N ______________________________________________

U16 Get_adc_temp_val(void)
{
   Start_conv_channel(ADC_TEMP_CH);
   while (!Is_adc_conv_finished());
   return (U16)(ADCL+((U16)(ADCH<<8)));
}

S16 Read_temperature(void)
{
#ifndef AVRGCC
   U16 adc_code;
   S8 index=0;
   adc_code=Get_adc_temp_val();
   if(adc_code>temperature_code[0])
   {
      return (S16)(-20);
   }
   else
   {
      while(temperature_code[index++]>adc_code);
      return (S16)(index-1-20);
   }
#else
   U16 adc_code;
   S8 index=0;
   adc_code=Get_adc_temp_val();
   if(adc_code>pgm_read_word_near(&temperature_code))
   {
      return (S16)(-20);
   }
   else
   {
      while(pgm_read_word_near(&temperature_code[index++])>adc_code);
      return (S16)(index-1-20);
   }   

#endif
}


#endif // USE_ADC