//*****************************************************************************// 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/signal.h> // include "signal" names (interrupt names)#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 (PORTC) 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) { // 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;}