📄 main.c
字号:
if (num == 0)
return 1;
while(num != 0)
{
num /= 10;
digCount++;
}
return digCount;
}
//===========Converting an integer to a character string, for LCD display===========
//int integer: integer to be converted
//char *str: the pointer of character string
//U8 FracLen: digit of fraction
char * Integer2String(int integer, char *str)
{
char *address =str;
U8 i, j, Length;
int times;
if(integer>=0)
{
str[0] = ' ';
}
else
{
str[0] = '-';
integer *= (-1);
}
Length = Digit_Integer(integer);
for(i=0; i<Length; i++)
{
times = 1;
for(j=0; j<Length-1-i; j++)
times *= 10;
str[i+1]='0'+(integer/times)%10;
}
return address;
}
//===========Converting a float number to a character string, for LCD display===========
//double floatnum: float number
//char *str: the pointer of character string
//U8 FracLen: digit of fraction
char * Float2String(double floatnum, char *str, U8 FracLen)
{
char *address = str;
const double EPS = 1e-7;
int integer, fraction;
U8 IntLen, i, j;
int times;
if(floatnum>=EPS) //floatnum is positive
str[0] = ' '; //ASCII of 'space' is 32;
else //floatnum is minus
{
floatnum = (-1)*floatnum;
str[0] = '-';
}
integer = (int)floatnum;
IntLen = Digit_Integer(integer);
for(i=0; i<IntLen; i++)
{
times = 1;
for(j=0; j<IntLen-1-i; j++)
times *= 10;
str[i+1]='0'+(integer/times)%10;
}
str[IntLen+1]='.'; //dot of fraction
for(i=0; i<FracLen; i++)
times *= 10;
fraction = (int)((floatnum-integer)*times);
for(i=0; i<FracLen; i++)
{
times = 1;
for(j=0; j<FracLen-1-i; j++)
times *= 10;
str[i+IntLen+2]='0'+(fraction/times)%10;
}
str[IntLen+FracLen+2]='\0';
return address;
}
void Interrupt_Init(void)
{
//the waveform will be distorted while using rising edge triggerd!
rEXTINT0 = (rEXTINT0 & ~(7<<4))|(4<<4); //EINT1=rising edge triggered
//rEXTINT0 = (rEXTINT0 & ~(7<<4))|(2<<4); //EINT1=falling edge triggered
pISR_EINT1=(U32)Eint1Int;
pISR_TIMER0=(int)Timer0Done;
rSRCPND = (BIT_EINT1 | BIT_TIMER0); //to clear the previous pending states
rINTPND = (BIT_EINT1 | BIT_TIMER0);
rINTMSK =~(BIT_EINT1 | BIT_TIMER0);//enable external interrupt 1 and timer0
}
void Set_SamplingRate(int samp_freq)
{
samplingrate = samp_freq;
switch(samp_freq)
{
case SAMP_RATE_1KHZ:
rTCFG0 = rTCFG0 & ~(0xffffff) | 0x000fa8; //Dead zone=0,Prescaler1=15(0x0f),Prescaler0=168(0xa8)
rTCFG1 = rTCFG1 & ~(0xffffff) | 0x001230; //All interrupt,Mux4=1/2,Mux3=1/4,Mux2=1/8,Mux1=1/16,Mux0=1/2
rTCNTB0 = 150; //set timer0:1ms fs=50.7MHz/(168+1)/2/150=1kHz
rTCMPB0 = 75; //(H/L)duty 50%
break;
case SAMP_RATE_2KHZ:
rTCFG0 = rTCFG0 & ~(0xffffff) | 0x000fa8; //Dead zone=0,Prescaler1=15(0x0f),Prescaler0=168(0xa8)
rTCFG1 = rTCFG1 & ~(0xffffff) | 0x001230; //All interrupt,Mux4=1/2,Mux3=1/4,Mux2=1/8,Mux1=1/16,Mux0=1/2
rTCNTB0 = 75; //set timer0:0.5ms fs=50.7MHz/(168+1)/2/75=2kHz
rTCMPB0 = 38; //(H/L)duty 50%
break;
case SAMP_RATE_5KHZ:
rTCFG0 = rTCFG0 & ~(0xffffff) | 0x000fa8; //Dead zone=0,Prescaler1=15(0x0f),Prescaler0=168(0xa8)
rTCFG1 = rTCFG1 & ~(0xffffff) | 0x001230; //All interrupt,Mux4=1/2,Mux3=1/4,Mux2=1/8,Mux1=1/16,Mux0=1/2
rTCNTB0 = 30; //set timer0:0.2ms fs=50.7MHz/(168+1)/2/30=5kHz
rTCMPB0 = 15; //(H/L)duty 50%
case SAMP_RATE_10KHZ:
rTCFG0 = rTCFG0 & ~(0xffffff) | 0x000f10; //Dead zone=0,Prescaler1=15(0x0f),Prescaler0=16(0x10)
rTCFG1 = rTCFG1 & ~(0xffffff) | 0x001230; //All interrupt,Mux4=1/2,Mux3=1/4,Mux2=1/8,Mux1=1/16,Mux0=1/2
rTCNTB0 = 150; //set timer0:0.1ms fs=50.7MHz/(16+1)/2/150=0.9941kHz
rTCMPB0 = 75; //(H/L)duty 50%
break;
case SAMP_RATE_20KHZ:
rTCFG0 = rTCFG0 & ~(0xffffff) | 0x000f10; //Dead zone=0,Prescaler1=15(0x0f),Prescaler0=16(0x10)
rTCFG1 = rTCFG1 & ~(0xffffff) | 0x001230; //All interrupt,Mux4=1/2,Mux3=1/4,Mux2=1/8,Mux1=1/16,Mux0=1/2
rTCNTB0 = 75; //set timer0:0.05ms fs=50.7MHz/(16+1)/2/75=1.9882kHz
rTCMPB0 = 38; //(H/L)duty 50%
break;
case SAMP_RATE_50KHZ:
rTCFG0 = rTCFG0 & ~(0xffffff) | 0x000f10; //Dead zone=0,Prescaler1=15(0x0f),Prescaler0=16(0x10)
rTCFG1 = rTCFG1 & ~(0xffffff) | 0x001230; //All interrupt,Mux4=1/2,Mux3=1/4,Mux2=1/8,Mux1=1/16,Mux0=1/2
rTCNTB0 = 30; //set timer0:0.02ms fs=50.7MHz/(16+1)/2/30=49.7059kHz
rTCMPB0 = 15; //(H/L)duty 50%
break;
case SAMP_RATE_100KHZ:
rTCFG0 = rTCFG0 & ~(0xffffff) | 0x000f02; //Dead zone=0,Prescaler1=15(0x0f),Prescaler0=2(0x02)
rTCFG1 = rTCFG1 & ~(0xffffff) | 0x001230; //All interrupt,Mux4=1/2,Mux3=1/4,Mux2=1/8,Mux1=1/16,Mux0=1/2
rTCNTB0 = 85; //set timer0:10us fs=50.7MHz/(2+1)/2/85=99.4118kHz
rTCMPB0 = 43; //(H/L)duty 50%
break;
case SAMP_RATE_200KHZ:
rTCFG0 = rTCFG0 & ~(0xffffff) | 0x000f02; //Dead zone=0,Prescaler1=15(0x0f),Prescaler0=2(0x02)
rTCFG1 = rTCFG1 & ~(0xffffff) | 0x001230; //All interrupt,Mux4=1/2,Mux3=1/4,Mux2=1/8,Mux1=1/16,Mux0=1/2
rTCNTB0 = 42; //set timer0:5us fs=50.7MHz/(2+1)/2/42=201.1905kHz
rTCMPB0 = 21; //(H/L)duty 50%
break;
default:
break;
}
}
void Main(void)
{
int j;
int max, min, sum;
int zero_cnt, zero_index[]={0};
char buffer[20] = "\0";
double freq, avg, peak;
ChangeClockDivider(1, 1);
ChangeMPllValue(0xa1, 0x3, 0x1);
Port_Init();
Uart_Init(0,115200);
Uart_Select(0);
rBWSCON =rBWSCON & 0xffffffcf|(1<<4); //set bus width of BANK1 to 16 bit
while(1)
{
Timer_Port_Init();
Interrupt_Init();
//Uart_Printf("Timer Interrupt Start.\n");
ADC_Index = 0;
Conversion_Complete = 0;
Set_SamplingRate(SAMP_RATE_100KHZ);
rTCON = rTCON & ~(0xf) | 0xa; //stop timer0
rTCON = rTCON & ~(0xf) | 0x9; //start timer0,enbale auto-reload
while(!Conversion_Complete); //waiting for interrupts
rTCON = rTCON & ~(0xf) | 0x0; //stop timer0,very important!
rINTMSK |= BIT_TIMER0; //disable Timer0 interrupt
//display the waveform of acquisited data on the LCD panel
Lcd_Port_Init();
Lcd_Init();
Lcd_EnvidOnOff(1);
ClearScreen(BLACK);
//Uart_Printf("Timer Interrupt Return.\n");
//Uart_Printf("AD7892 digital output:\n");
for(j=0; j<SAMP_NUM; j++)
{
result[j] >>= 4;
result[j] &= 0xfff;
if (result[j]&0x800)
result[j] -= 4096;
//Uart_Printf("%d\n",result[j]);
//if((j+1)%20==0)
//Uart_Printf("\n");
}
Uart_Printf("\n");
Uart_Printf("Sampling Rate of AD7892: %d kSPS\n", samplingrate);
Uart_Printf("Sampling Number of AD7892: %d\n", ADC_Index);
//acquisited signal filtering
for(j=2; j<SAMP_NUM; j++)
result[j] = (result[j-2]+result[j-1]+result[j])/3; //Slip-average filtering with a 3-point window
//acquisited data processing
max = min = 0;
sum = 0;
for(j=0; j<SAMP_NUM; j++)
{
sum += result[j];
if(result[j]>max)
max = result[j];
if(result[j]<min)
min = result[j];
}
//[-2048, +2047]==>[-5V, +5V]
peak = (max-min)/2048.0*5.0;//peak-to-peak value
sum /= SAMP_NUM;
avg = sum/2048.0*5.0; //average value
Uart_Printf("Average: %d\n", sum);
Uart_Printf("Maximum: %d\n", max);
Uart_Printf("Minimum: %d\n", min);
//Find index of front-direction zero-crossings to calculate period of original signal
zero_cnt = 0;
for(j=0; j<(SAMP_NUM-1); j++)
{
if( (result[j] <sum) && (result[j+1]>sum) || (result[j]==sum) )
{
zero_index[zero_cnt] = j;
zero_cnt++;
}
}
//Uart_Printf("Index of zero-crossings:");
//for(j=0; j<zero_cnt; j++)
//Uart_Printf(" %d,", zero_index[j]);
sum = 0;
//consider two special circumstances: no front-direction zero-crossing, only one front-direction zero-crossing
for(j=0; j<(zero_cnt-1); j++)
{
zero_index[j] = zero_index[j+1] - zero_index[j]; //sampling point number per period
sum += zero_index[j];
}
sum /= (zero_cnt-1);
Uart_Printf("Point per period: %d\n", sum+1);
freq = samplingrate*1000.0/(sum+1); //kSPS==>Hz
for(j=0; j<SAMP_NUM; j++)
PutPixel((result[j]>>XSCALE)+90, (int)(j/YSCALE), YELLOW);
//horizontally display waveform with yellow color
Draw_Line(90, 0, 90, 319, BLUE);
Draw_Rectangle(20, 0, 220, 319, SKYBLUE);
Draw_Line(160, 0, 160, 319, PURPLE);
//Fill_Rectangle(238, 39, 222, 55, RED);
//Postscript
Display_Ascii_Clockwise90("Dec 2006, Lab615 of NUAA, GNU GPL", 0, 40, GREEN);
//Title: 8-channel analog input
Display_Ascii_Clockwise90("8", 222, 60, RED);
for (j=0; j<7; j++)
Display_Chinese_Clockwise90(&analog16S[j*32], 16, 222, 68+j*16, RED);
//(timing acquisition)
Display_Ascii_Clockwise90("(", 222, 180, RED);
for (j=0; j<2; j++)
Display_Chinese_Clockwise90(&timing16K[j*32], 16, 222, 188+j*16, RED);
for (j=0; j<2; j++)
Display_Chinese_Clockwise90(&acquisition16K[j*32], 16, 222, 188+(j+2)*16, RED);
Display_Ascii_Clockwise90(")", 222, 252, RED);
//frequency
for (j=0; j<2; j++)
Display_Chinese_Clockwise90(&frequency16K[j*32], 16, 200, 10+j*16, YELLOW);
Display_Ascii_Clockwise90(":", 200, 10+32, YELLOW);
memset(buffer, 0, 20);
Float2String(freq, buffer, 4);
Display_Ascii_Clockwise90(buffer, 200, 10+32+8, ORANGE);
Display_Ascii_Clockwise90(" Hz", 200, 10+32+8*10, YELLOW);
//period
for (j=0; j<2; j++)
Display_Chinese_Clockwise90(&period16K[j*32], 16, 182, 10+j*16, YELLOW);
Display_Ascii_Clockwise90(":", 182, 10+32, YELLOW);
memset(buffer, 0, 20);
Float2String(1000/freq, buffer, 4);
Display_Ascii_Clockwise90(buffer, 182, 10+32+8, ORANGE);
Display_Ascii_Clockwise90(" ms", 182, 10+32+8*10, YELLOW);
//sampling rate
for (j=0; j<2; j++)
{
Display_Chinese_Clockwise90(&sample16K[j*32], 16, 164, 10+j*16, YELLOW);
Display_Chinese_Clockwise90(&frequency16K[j*32], 16, 164, 10+(j+2)*16, YELLOW);
}
Display_Ascii_Clockwise90(":", 164, 10+64, YELLOW);//':' and 'space'
memset(buffer, 0, 20);
Integer2String(samplingrate, buffer);
Display_Ascii_Clockwise90(buffer, 164, 10+64+8, ORANGE);
Display_Ascii_Clockwise90(" kSPS", 164, 10+64+8*6, YELLOW);
//peak-value
for (j=0; j<2; j++)
Display_Chinese_Clockwise90(&peak16K[0], 16, 200, 180+j*16, YELLOW);
Display_Chinese_Clockwise90(&value16K[0], 16, 200, 180+2*16, YELLOW);
Display_Ascii_Clockwise90(":", 200, 180+48, YELLOW);
memset(buffer, 0, 20);
Float2String(peak, buffer, 4);
Display_Ascii_Clockwise90(buffer, 200, 180+48+8, ORANGE);
Display_Ascii_Clockwise90(" V", 200, 180+48+8*8, YELLOW);
//average value
for (j=0; j<2; j++)
Display_Chinese_Clockwise90(&average16K[j*32], 16, 182, 180+j*16, YELLOW);
Display_Chinese_Clockwise90(&value16K[0], 16, 182, 180+2*16, YELLOW);
Display_Ascii_Clockwise90(":", 182, 180+48, YELLOW);
memset(buffer, 0, 20);
Float2String(avg, buffer, 4);
Display_Ascii_Clockwise90(buffer, 182, 180+48+8, ORANGE);
Display_Ascii_Clockwise90(" V", 182, 180+48+8*8, YELLOW);
//sampling point
for (j=0; j<2; j++)
{
Display_Chinese_Clockwise90(&sample16K[j*32], 16, 164, 180+j*16, YELLOW);
Display_Chinese_Clockwise90(&pointnum16K[j*32], 16, 164, 180+(j+2)*16, YELLOW);
}
Display_Ascii_Clockwise90(":", 164, 180+64, YELLOW);
memset(buffer, 0, 20);
Integer2String(ADC_Index, buffer);
Display_Ascii_Clockwise90(buffer, 164, 180+64+8*2, ORANGE);
Uart_Printf("\nPress any key to next loop.\n");
Uart_Getch();
Lcd_EnvidOnOff(0);
Lcd_Port_Return();
Timer_Port_Return();
Uart_Printf("\nPress any key to continue...\n");
Uart_Getch();
}
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