library

//*****************************************************************************
// File Name    : a2dtest.c
// 
// Title                : example usage of some avr library functions
// Revision             : 1.0
// Notes                :       
// Target MCU   : Atmel AVR series
// Editor Tabs  : 4
// 
// Revision History:
// When                 Who                     Description of change
// -----------  -----------     -----------------------
// 20-Oct-2002  pstang          Created the program
//*****************************************************************************
 
//----- Include Files ---------------------------------------------------------
#include <avr/io.h>             // include I/O definitions (port names, pin names, etc)
#include <avr/interrupt.h>      // include interrupt support

#include "global.h"             // include our global settings
#include "uart.h"               // include uart function library
#include "rprintf.h"    // include printf function library
#include "timer.h"              // include timer function library (timing, PWM, etc)
#include "a2d.h"                // include A/D converter function library
#include "vt100.h"              // include VT100 terminal support

//----- Begin Code ------------------------------------------------------------
int main(void)
{
        u16 a=0;
        u08 i=0;

        // initialize our libraries
        // initialize the UART (serial port)
        uartInit();
        // make all rprintf statements use uart for output
        rprintfInit(uartSendByte);
        // initialize the timer system
        timerInit();
        // turn on and initialize A/D converter
        a2dInit();

        // print a little intro message so we know things are working
        vt100ClearScreen();
        vt100SetCursorPos(1,1);
        rprintf("Welcome to the a2d test!\r\n");
        
        // configure a2d port (PORTA) as input
        // so we can receive analog signals
        DDRA = 0x00;
        // make sure pull-up resistors are turned off
        PORTA = 0x00;

        // set the a2d prescaler (clock division ratio)
        // - a lower prescale setting will make the a2d converter go faster
        // - a higher setting will make it go slower but the measurements
        //   will be more accurate
        // - other allowed prescale values can be found in a2d.h
        a2dSetPrescaler(ADC_PRESCALE_DIV32);

        // set the a2d reference
        // - the reference is the voltage against which a2d measurements are made
        // - other allowed reference values can be found in a2d.h
        a2dSetReference(ADC_REFERENCE_AVCC);

        // use a2dConvert8bit(channel#) to get an 8bit a2d reading
        // use a2dConvert10bit(channel#) to get a 10bit a2d reading

        while(1)
        {
                // sample all a2d channels and print them to the terminal
                vt100SetCursorPos(2,1);
                for(i=0; i<8; i++)
                {
                        rprintf("Channel %d: %d   \r\n", i, a2dConvert8bit(i));
                }
                // print the sample number so far
                rprintf("Sample # : %d   \r\n", a++);
        }
        
        return 0;
}