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//***************************************************************************** |
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// File Name : a2dtest.c |
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// |
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// Title : example usage of some avr library functions |
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// Revision : 1.0 |
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// Notes : |
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// Target MCU : Atmel AVR series |
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// Editor Tabs : 4 |
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// |
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// Revision History: |
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// When Who Description of change |
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// ----------- ----------- ----------------------- |
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// 20-Oct-2002 pstang Created the program |
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//***************************************************************************** |
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//----- Include Files --------------------------------------------------------- |
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#include <avr/io.h> // include I/O definitions (port names, pin names, etc) |
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#include <avr/interrupt.h> // include interrupt support |
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#include "global.h" // include our global settings |
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#include "uart.h" // include uart function library |
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#include "rprintf.h" // include printf function library |
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#include "timer.h" // include timer function library (timing, PWM, etc) |
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#include "a2d.h" // include A/D converter function library |
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#include "vt100.h" // include VT100 terminal support |
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//----- Begin Code ------------------------------------------------------------ |
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int main(void) |
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{ |
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u16 a=0; |
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u08 i=0; |
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// initialize our libraries |
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// initialize the UART (serial port) |
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uartInit(); |
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// make all rprintf statements use uart for output |
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rprintfInit(uartSendByte); |
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// initialize the timer system |
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timerInit(); |
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// turn on and initialize A/D converter |
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a2dInit(); |
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// print a little intro message so we know things are working |
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/* vt100ClearScreen(); |
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vt100SetCursorPos(1,1); |
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rprintf("Welcome to the a2d test!\r\n");*/ |
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// configure a2d port (PORTA) as input |
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// so we can receive analog signals |
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DDRC = 0x00; |
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// make sure pull-up resistors are turned off |
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PORTC = 0x00; |
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// set the a2d prescaler (clock division ratio) |
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// - a lower prescale setting will make the a2d converter go faster |
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// - a higher setting will make it go slower but the measurements |
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// will be more accurate |
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// - other allowed prescale values can be found in a2d.h |
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a2dSetPrescaler(ADC_PRESCALE_DIV32); |
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// set the a2d reference |
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// - the reference is the voltage against which a2d measurements are made |
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// - other allowed reference values can be found in a2d.h |
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a2dSetReference(ADC_REFERENCE_AVCC); |
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// use a2dConvert8bit(channel#) to get an 8bit a2d reading |
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// use a2dConvert10bit(channel#) to get a 10bit a2d reading |
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while(1) |
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{ |
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u08 c=0; |
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u08 n; |
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char radka[100]; |
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for(n=0;n<100;n++) radka[n]=0; |
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n=0; |
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while(uartReceiveByte(&c)) |
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{ |
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radka[n]=c; |
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n++; |
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} |
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n=0; |
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while (0!=radka[n]) |
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{ |
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uartSendByte(radka[n]); |
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n++; |
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timerPause(31); |
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} |
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/* // sample all a2d channels and print them to the terminal |
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vt100SetCursorPos(2,1); |
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for(i=0; i<6; i++) |
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{ |
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rprintf("Channel %d: %d \r\n", i, a2dConvert8bit(i)); |
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timerPause(1000); |
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} |
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// print the sample number so far |
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rprintf("Sample # : %d \r\n", a++);*/ |
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} |
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return 0; |
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} |