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alarassi
Joined: 28 Mar 2010
Posts: 8
Location: Malaysia
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| GLCD oscilloscope |
 Posted: Sun Apr 11, 2010 1:50 pm |
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hello guys
I'm doing a project of GLCD oscilloscope that I have found online.
http://www.semifluid.com/?p=15
The code was written in CCS and I found some difficulty to understand some parts of it.
Can you pls explain to me what were the steps taken in the following part and how !
| Code: |
void displayFloat(int8 x, int8 y, float oldValue, float theValue) {
char toPrintOld[9];
char toPrint[9];
sprintf(toPrintOld, "%f", oldValue);
sprintf(toPrint, "%f", theValue);
toPrintOld[4] = '\0';
toPrint[4] = '\0'; // Limit shown digits to 3
glcd_text35(x, y, toPrintOld, OFF);
glcd_text35(x, y, toPrint, ON);
}
void displayInt8(int8 x, int8 y, int8 oldValue, int8 theValue) {
char toPrintOld[4];
char toPrint[4];
sprintf(toPrintOld, "%u", oldValue);
sprintf(toPrint, "%u", theValue);
toPrintOld[3] = '\0';
toPrint[3] = '\0'; // Limit shown digits to 3
glcd_text35(x, y, toPrintOld, OFF);
glcd_text35(x, y, toPrint, ON);
}
void displayInt16(int8 x, int8 y, int16 oldValue, int16 theValue) {
char toPrintOld[6];
char toPrint[6];
sprintf(toPrintOld, "%lu", oldValue);
sprintf(toPrint, "%lu", theValue);
toPrintOld[5] = '\0';
toPrint[5] = '\0'; // Limit shown digits to 5
glcd_text35(x, y, toPrintOld, OFF);
glcd_text35(x, y, toPrint, ON);
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alarassi
Joined: 28 Mar 2010
Posts: 8
Location: Malaysia
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| Posted: Sun Apr 11, 2010 1:52 pm |
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This is the full code for reference.
Hope I can find help.
| Code: |
#include <18F2550.h>
#device ADC=10
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN
#use delay(clock=48000000)
#use rs232(stream=PC, baud=115200, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#include <GLCD - modified.c>
#INT_RDA
void serial_isr() // Serial Interrupt
{
if (fgetc(PC) == 0x12 & fgetc(PC) == 0x34 & fgetc(PC) == 0x56 & fgetc(PC) == 0x78 & fgetc(PC) == 0x90) #asm reset #endasm
}
void displayFloat(int8 x, int8 y, float oldValue, float theValue) {
char toPrintOld[9];
char toPrint[9];
sprintf(toPrintOld, "%f", oldValue);
sprintf(toPrint, "%f", theValue);
toPrintOld[4] = '\0';
toPrint[4] = '\0'; // Limit shown digits to 3
glcd_text35(x, y, toPrintOld, OFF);
glcd_text35(x, y, toPrint, ON);
}
void displayInt8(int8 x, int8 y, int8 oldValue, int8 theValue) {
char toPrintOld[4];
char toPrint[4];
sprintf(toPrintOld, "%u", oldValue);
sprintf(toPrint, "%u", theValue);
toPrintOld[3] = '\0';
toPrint[3] = '\0'; // Limit shown digits to 3
glcd_text35(x, y, toPrintOld, OFF);
glcd_text35(x, y, toPrint, ON);
}
void displayInt16(int8 x, int8 y, int16 oldValue, int16 theValue) {
char toPrintOld[6];
char toPrint[6];
sprintf(toPrintOld, "%lu", oldValue);
sprintf(toPrint, "%lu", theValue);
toPrintOld[5] = '\0';
toPrint[5] = '\0'; // Limit shown digits to 5
glcd_text35(x, y, toPrintOld, OFF);
glcd_text35(x, y, toPrint, ON);
}
int8 useThreshold = 0; // 0 = Off, 1 = Rising, 2 = Falling
int8 theThreshold = 127;
int8 timeType = 2; // 1 = us, 2 = ms
int8 timePeriod = 4; // us or ms per measurement (* 25 for each div)
int8 voltageRange = 1; // 1 = 0 - 5V, 2 = 0 - 2.5V, 3 = 0 - 1.25V
float voltageConst = 0.079365; // For displaying the scaled voltage
char strAverageV[] = "Av";
char strVMaximum[] = "Mx";
char strVMinimum[] = "Mn";
char strVPtoP[] = "PP";
char strThreshold[] ="Th";
char strOff[] = "Off";
char strRising[] = "Rise";
char strFalling[] = "Fall";
char strTime[] = "Tm";
char strMs[] = "ms/div";
char strHz[] = "Hz";
char strRange[] = "R";
char strR0to5[] = "0-5";
char strR0to25[] = "0-2.5";
char strR0to12[] = "0-1.2";
void changeThreshold(int8 theUsage, int8 theValue) {
float tempFloat = 0.0;
tempFloat = (theThreshold>>2) * voltageConst;
if (theUsage == 0)
glcd_text35(12, 24, strOff, OFF);
else if (theUsage == 1) {
glcd_text35(12, 24, strRising, OFF);
displayFloat(12, 30, tempFloat, (theValue>>2) * voltageConst);
}
else if (theUsage == 2) {
glcd_text35(12, 24, strFalling, OFF);
displayFloat(12, 30, tempFloat, (theValue>>2) * voltageConst);
}
useThreshold = theUsage;
theThreshold = theValue;
glcd_text35(0, 24, strThreshold, ON);
if (useThreshold == 0) glcd_text35(12, 24, strOff, ON);
else if (useThreshold == 1) glcd_text35(12, 24, strRising, ON);
else if (useThreshold == 2) glcd_text35(12, 24, strFalling, ON);
}
void changeTimeDivision(int8 theType, int16 theValue) {
float tempFloat = 0.0, tempFloat2 = 0.0;
glcd_text35(0, 36, strTime, ON);
if (theType == 1) {
tempFloat = timePeriod * 25;
tempFloat2 = theValue * 25;
displayFloat(12, 36, tempFloat/1000, tempFloat2/1000);
}
else if (theType == 2)
displayFloat(12, 36, timePeriod * 25, theValue * 25);
timeType = theType;
timePeriod = theValue;
if ((theType == 1) && (timePeriod < 16)) timePeriod = 16;
glcd_text35(4, 42, strMs, ON);
}
void changeVoltageRange(int8 theType) {
glcd_text35(0, 54, strRange, ON);
if (voltageRange == 1) glcd_text35(8, 54, strR0to5, OFF);
else if (voltageRange == 2) glcd_text35(8, 54, strR0to25, OFF);
else if (voltageRange == 3) glcd_text35(8, 54, strR0to12, OFF);
voltageRange = theType;
if (voltageRange == 1) voltageConst = 0.079365;
else if (voltageRange == 2) voltageConst = 0.039683;
else if (voltageRange == 3) voltageConst = 0.019841;
if (voltageRange == 1) glcd_text35(8, 54, strR0to5, ON);
else if (voltageRange == 2) glcd_text35(8, 54, strR0to25, ON);
else if (voltageRange == 3) glcd_text35(8, 54, strR0to12, ON);
}
void main() {
int8 const numOfSamples = 100;
int16 HQadcReadings[numOfSamples];
int8 adcReadings[numOfSamples], adcReadingsOld[numOfSamples];
int8 i = 0;
int8 thres2 = 1;
int16 tempThres = 0, k = 0;
float avgV = 0.0, avgVOld = 0.0;
float maxV = 0.0, maxVOld = 0.0;
float minV = 0.0, minVOld = 0.0;
float ptopV = 0.0, ptopVOld = 0.0;
int16 theFreq = 0.0, theFreqOld = 0.0;
SETUP_ADC_PORTS(AN0 | VSS_VDD); // Setup ADC Pins
SETUP_ADC(ADC_CLOCK_DIV_64); // Setup ADC
SETUP_TIMER_0(RTCC_INTERNAL|RTCC_DIV_1); // Use the int. osc. for Timer 0
SETUP_TIMER_1(T1_DISABLED); // Disable Timer 1
SETUP_TIMER_2(T2_DISABLED, 127, 1); // Disable Timer 2
SETUP_TIMER_3(T3_DISABLED); // Disable Timer 3
SETUP_CCP1(CCP_OFF); // Disable CCP1
SETUP_CCP2(CCP_OFF); // Disable CCP2
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
glcd_init(ON); // Must initialize the LCD
glcd_line((128-numOfSamples),0,(128-numOfSamples),63,ON);
// Draw static text
glcd_text35(0, 0, strAverageV, ON);
glcd_text35(0, 6, strVMaximum, ON);
glcd_text35(0, 12, strVMinimum, ON);
glcd_text35(0, 18, strVPtoP, ON);
glcd_text35(20, 48, strHz, ON);
// Setup variable ranges
changeVoltageRange(1); // Set voltage range
changeTimeDivision(2, 100); // Set time divisions
changeThreshold(1, 127); // Set threshold level
set_adc_channel(0);
delay_ms(10);
delay_ms(100);
while (TRUE) {
// If using threshold, wait until it has been reached
if (voltageRange == 1) tempThres = (int16) theThreshold << 2;
else if (voltageRange == 2) tempThres = (int16) theThreshold << 1;
else if (voltageRange == 3) tempThres = (int16) theThreshold;
if (useThreshold == 1) {
k = 0;
while ((READ_ADC()>tempThres) && (k<65535)) (k++);
k = 0;
while ((READ_ADC()<tempThres) && (k<65535)) (k++);
}
else if (useThreshold == 2) {
k = 0;
while ((READ_ADC()<tempThres) && (k<65535)) (k++);
k = 0;
while ((READ_ADC()>tempThres) && (k<65535)) (k++);
}
// Collect ADC readings
if (timeType == 1)
for (i=0; i<numOfSamples; i++) {
HQadcReadings[i] = read_adc();
delay_us(timePeriod-16);
}
else if (timeType == 2)
for (i=0; i<numOfSamples; i++) {
HQadcReadings[i] = read_adc();
delay_ms(timePeriod);
}
for (i=0; i<numOfSamples; i++) {
if (voltageRange == 1) adcReadings[i] = 63-(HQadcReadings[i]>>4);
else if (voltageRange == 2) adcReadings[i] = 63-(HQadcReadings[i]>>3);
else if (voltageRange == 3) adcReadings[i] = 63-(HQadcReadings[i]>>2);
}
// Draw ADC readings
for (i=1; i<numOfSamples; i++)
glcd_pixel(i+(128-numOfSamples),adcReadingsOld[i],OFF);
for (i=1; i<numOfSamples; i++)
glcd_pixel(i+(128-numOfSamples),adcReadings[i],ON);
for (i=0; i<numOfSamples; i++)
adcReadingsOld[i] = adcReadings[i];
// Calculate and display frequency of signal using zero crossing
// displayint8(0, 54, thres2, 0);
if (useThreshold != 0) {
for (i=0; i<63; i+=3)
glcd_pixel(thres2+(128-numOfSamples),i,OFF);
if (useThreshold == 1) {
thres2 = 1;
while ((adcReadings[thres2]<(63-(theThreshold>>2))) && (thres2<numOfSamples-1)) (thres2++);
thres2++;
while ((adcReadings[thres2]>(63-(theThreshold>>2))) && (thres2<numOfSamples-1)) (thres2++);
}
else if (useThreshold == 2) {
thres2 = 1;
while ((adcReadings[thres2]>(63-(theThreshold>>2))) && (thres2<numOfSamples-1)) (thres2++);
thres2++;
while ((adcReadings[thres2]<(63-(theThreshold>>2))) && (thres2<numOfSamples-1)) (thres2++);
}
// displayint8(0, 54, 0, thres2);
for (i=0; i<63; i+=3)
glcd_pixel(thres2+(128-numOfSamples),i,ON);
k = (int16) thres2 * timePeriod;
if (timeType == 1) theFreq = (float) 1000/k * 1000;
if (timeType == 2) theFreq = (float) 1000/k;
displayInt16(0, 48, theFreqOld, theFreq);
theFreqOld = theFreq;
}
// Calculate and display Average V
avgV = 0;
for (i=0; i<numOfSamples; i++)
avgV = (float) avgV + adcReadings[i];
avgV = (float) (63-(avgV / numOfSamples)) * voltageConst;
displayFloat(12, 0, avgVOld, avgV);
avgVOld = avgV;
// Calculate and display Maximum V
maxV = 63;
for (i=0; i<numOfSamples; i++)
if (adcReadings[i]<maxV) maxV = adcReadings[i];
maxV = (float) (63-maxV) * voltageConst;
displayFloat(12, 6, maxVOld, maxV);
maxVOld = maxV;
// Calculate and display Minimum V
minV = 0;
for (i=0; i<numOfSamples; i++)
if (adcReadings[i]>minV) minV = adcReadings[i];
minV = (float) (63-minV) * voltageConst;
displayFloat(12, 12, minVOld, minV);
minVOld = minV;
// Calculate and display Peak-to-peak V
ptopV = maxV - minV;
displayFloat(12, 18, ptopVOld, ptopV);
ptopVOld = ptopV;
// Display graph lines
if (useThreshold != 0)
for (i=29; i<127; i+=3)
glcd_pixel(i,63-(theThreshold>>2),ON);
for (i=0; i<63; i+=5) {
glcd_pixel(53,i,ON);
glcd_pixel(78,i,ON);
glcd_pixel(103,i,ON);
glcd_pixel(127,i,ON);
}
delay_ms(100); // Reduces flicker by allowing pixels to be on
// much longer than off
}
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Apr 12, 2010 12:52 pm |
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These are functions to display numbers on the Graphic LCD.
The sprintf() function is used to convert the number into an ASCII string.
The ASCII string is then given to the glcd_text35() function. That
function converts each ASCII character into graphic dots, and writes
the dots on the Graphic LCD. |
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