低成本AVR單片機+LCD示波器(源碼+原理圖)

ID:392628 · 發表于 2018-9-11 19:17

低成本AVR+LCD示波器,內有源碼，原理圖等。

電路原理圖如下：

單片機源程序如下:

/* AVR oscilloscope with 128x64 graphic LCD.
Created by Serasidis Vassilis and finished at 03.Aug.2007
e-mail: info@serasidis.gr and avrsite@yahoo.gr
This code is ditributed under GPL licence.
*/
#include <avr/io.h> // include I/O definitions (port names, pin names, etc)
#include <avr/interrupt.h>
#include "glcd.c"
void USART_Init(unsigned int baudrate);
void timePause(unsigned long count);
void ADC_init (void);
void initTimer (void);
/* define CPU frequency in Mhz here if not defined in Makefile */
#ifndef F_CPU
#define F_CPU 16000000UL
#endif
#define msUp 1
#define msDwn 4
#define YposUp 0
#define YposDwn 3
#define freeze 2
#define AC 0
#define DC 1
#define SQUARE 2
#define TRUE 0
#define FALSE 1
unsigned int counter = 0;
unsigned int dataCounter = 0;
unsigned int timeDiv = 52;
unsigned int analogInput = 0;
unsigned char trigger = 2;
unsigned char cnt = 0;
unsigned char empty = 0;
unsigned int out = 0;
unsigned char findZero = 0;
unsigned char pressedButton = 0;
unsigned char upLimit = 0;
unsigned char dnLimit = 255;
unsigned char limitBkup = 0;
unsigned char voltageType = AC;
unsigned char complete = TRUE;
signed char Ypos = 0;
signed char Ypos2 = 0;
signed char position = 0;
int main (void)
{
DDRC = 0b00000000;
PORTC = 0b11111111;
DDRA = 0b00000000;
unsigned char temp1;
unsigned int temp2;
unsigned char i;
glcdInit();
ADC_init();
createWelcomeScreen();
showTheWave();
timePause(10000000);
for(;;)
{
//---------
if (pressedButton == 0)
{
if (~PINC & (1<<msUp) && (timeDiv <= 1000))
{
if(timeDiv == 0)
timeDiv = 52;
else
timeDiv += 145;
pressedButton = 1;
}
if (~PINC & (1<<msDwn) && (timeDiv >= 52))
{
if(timeDiv <= 145)
timeDiv = 0;
else
timeDiv -= 145;
pressedButton = 1;
}
if (~PINC & (1<<YposUp) && (Ypos2 <= 60))
Ypos2++;
if (~PINC & (1<<YposDwn) && (Ypos2 >= -60))
Ypos2--;
if (~PINC & (1<<freeze))
while (~PINC & (1<<freeze)); // It freezes the display to watch the wave.
}
else
{
temp1 = PINC;
if (temp1 == 255)
pressedButton = 0;
}
//--------v
// This routine makes the trigger.
dataCounter = 0;
findZero = 0;
upLimit = 0;
dnLimit = 255;
for (i=99; i>0; i--)
{
ADCSRA |= (1 << ADSC); // Enable ADC
loop_until_bit_is_set(ADCSRA, ADIF); // wait until conversion complete.
temp1 = ADCL;
temp2 = ADCH;
timePause(timeDiv); //(7);
if (upLimit < temp2) // find the higher voltage level of the input waveform.
upLimit = temp2;
if (dnLimit > temp2) // find the lower voltage level of the input waveform.
dnLimit = temp2;
if (temp2 > 0)
{
temp2 += 5;
temp2 /= 5;
temp2 += 2;
}else temp2 = 2;
position = temp2 + Ypos2 +5;
if (position <= 63 && position >= 0) // Adjust Up-Down the wave.
fillDataLcdBuffer(i,position);
else
fillDataLcdBuffer(i,0);
}
if(upLimit != dnLimit)
trigger = (((upLimit - dnLimit)/2)+ dnLimit); // find the middle of the wave, to be used it as a trigger.
//--------^
createRaster();
createWave();
showTheWave();
dataCounter = 0;
do
{
limitBkup = temp2;
ADCSRA |= (1 << ADSC); // Enable ADC
loop_until_bit_is_set(ADCSRA, ADIF);
temp1 = ADCL;
temp2 = ADCH;
//timerPause(timeDiv);
if(limitBkup == temp2)
{
dataCounter++;
if(dataCounter >= 500)
voltageType = DC;
else
voltageType = AC;
}
if((voltageType == AC) && ((temp2 == trigger) && (limitBkup < temp2)))
complete = TRUE;
else
if((voltageType == DC) && (limitBkup == temp2) && (upLimit != dnLimit))
{
dataCounter = 0;
do
{
ADCSRA |= (1 << ADSC); // Enable ADC
loop_until_bit_is_set(ADCSRA, ADIF);
temp1 = ADCL;
temp2 = ADCH;
complete = TRUE;
dataCounter++;
}while ((temp2 > trigger) && (dataCounter <1000));
dataCounter = 0;
do
{
ADCSRA |= (1 << ADSC); // Enable ADC
loop_until_bit_is_set(ADCSRA, ADIF);
temp1 = ADCL;
temp2 = ADCH;
complete = TRUE;
dataCounter++;
}while ((temp2 < trigger) && (dataCounter <1000));
}
else
if((voltageType == DC) && (limitBkup == temp2))
complete = TRUE;
else
complete = FALSE;
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