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/Designs/Data_loggers/GPSRL02A/SW/buffer/a2dtest.c
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//*****************************************************************************
// 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 <string.h>
 
#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
DDRC = 0x00;
// make sure pull-up resistors are turned off
PORTC = 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)
{
u08 c=0;
u08 n,i;
char radiace[10];
char radka[201];
 
for(n=0;n<=100;n++) radka[n]=0; // vynuluj bufferovaci pole
for(n=0;n<10;n++) radiace[n]=0; // vynuluj bufferovaci pole
 
n=0;
while(1) // pockej na $ kterym zacina NMEA radka
{
uartReceiveByte(&c);
if(c == '$') break;
}
 
for(i=0;i<100;i++) // nacti maximalne 100 znaku do bufferu
{
radka[n]=c;
if(c == '\n') break; // kdyz narazis na konec radku zastav nacitani
uartReceiveByte(&c);
n++;
}
 
radka[n]=0; // naztav na konec retezce pro zpracovani pomoci strcat
 
 
itoa(a2dConvert10bit(2),&radiace,10); //a2dConvert8bit(1)
if(n != 0)
{
strcat(radka, radiace);
strcat(radka,"\r");
}
n=0;
uartFlushReceiveBuffer();
 
while (0!=radka[n])
{
uartSendByte(radka[n]);
n++;
timerPause(35);
}
 
}
return 0;
}
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