manoj soorya
Member
HI all
I have a code for Frequency Meter... But I can't compile..
I am a newbe in Programming...
I am using Micro C for PIC..
Thank you in Advance
I have a code for Frequency Meter... But I can't compile..
I am a newbe in Programming...
I am using Micro C for PIC..
Code:
program freq628a
' FREQUENCY COUNTER 10Hz- 5.000MHZ; 5.000MHZ- 250.000MHZ with MB506 Prescaler
' Author: Alex Boguslavsky, RH Electronic http://rhelectronics.net
' mail: support@rhelectronics.net
' License: SHAREWARE. You can modify for your own personal needs.
' Commercial usage is restricted!
' You are responsible for any hardware or software modifications!
'-------------------------------------------------------------------------------
' PROJECT SETTINGS, CONFIG :$2007 : 0x2143
' navigate Project--> Edit project
'-------------------------------------------------------------------------------
' MCU: PIC16F628A
' Oscillator Frequency: 4.000000MHZ
' Oscillator Selection: I/O Function on RA6, CLKIN on RA7
' Watchgod Timer: disabled
' Power-Up Timer: enabled
' RA5/ MCLR: disabled
' Brown-Out Detect: enabled
' LV Programming: disabled
' EE Protection: disabled
' Flash protection: disabled
'-------------------------------------------------------------------------------
' RECONNENDED MODES:
' 1000ms for 0Hz-100KHz prescaler OFF
' 100ms for 100KHz-5MHz prescaler OFF
' 1000ms for 5MHz-16MHz prescaler ON
' 100ms for 16MHz-250MHz prescaler ON
'-------------------------------------------------------------------------------
' HF INPUT
' MB506 prescaler has 50 ohm input impedance and very sensitive for weak signals.
' with MB506 you can measure weak radio signals. When input is not connected,
' the prescaler will pick up radio frequency signals and LCD will
' display some values between 50Mhz-500MHz
'-------------------------------------------------------------------------------
' LF INPUT
' Low frequency input has good accuracy for signals up to 5MHz with minimum
' amplitude of 1V peak-to-peak.
'-------------------------------------------------------------------------------
' LCD MODULE CONNECTION
'-------------------------------------------------------------------------------
dim LCD_RS as sbit at RB1_bit
LCD_EN as sbit at RB0_bit
LCD_D4 as sbit at RA3_bit
LCD_D5 as sbit at RA2_bit
LCD_D6 as sbit at RA0_bit
LCD_D7 as sbit at RA1_bit
LCD_RS_Direction as sbit at TRISB1_bit
LCD_EN_Direction as sbit at TRISB0_bit
LCD_D4_Direction as sbit at TRISA3_bit
LCD_D5_Direction as sbit at TRISA2_bit
LCD_D6_Direction as sbit at TRISA0_bit
LCD_D7_Direction as sbit at TRISA1_bit
'-------------------------------------------------------------------------------
' GLOBAL VARIABLES
'-------------------------------------------------------------------------------
dim freq as word ' 16 bit variable for frequency 2^16
freq1 as longword ' 32 bit variable for frequency 2^32
cnt as word ' 16 bit variable for interrupt counter
ch as byte ' variable for extracting the frequency on LCD
ch1 as byte
ch2 as byte
n as longint ' 32 bit variable for delay counter
dim TIMER_START as byte ' Timer 1 start configuration byte
TIMER_STOP as byte ' Timer 1 stop configuration byte
prescaler as byte ' prescaler value
dim message as string[16] ' text variable for measuring window 100ms or 1000ms
'-------------------------------------------------------------------------------
' INTERRUPTS CONFIGURATION
'-------------------------------------------------------------------------------
sub procedure interrupt() ' Timer 1 interrupt subprocedure
if (TMR1IF_bit = 1) then
inc (cnt) ' increment cnt variable each time Timer 1 is overflow
TMR1IF_bit = 0
end if
end sub
'-------------------------------------------------------------------------------
' MAIN PROGRAM
'-------------------------------------------------------------------------------
main:
CMCON = %00000111 ' turn off comparator module
TRISA = %00100000 ' port A configuration
TRISB = %01001100 ' port B configuration. RB2, RB3, RB6 as input
T1CON = %00110110 ' Timer 1 control register, starting configuration: timer is stopped, external clock on RB6 not in sync with crystal oscillator, 1:8 prescale
PIE1 = %00000001 ' Periferal interrupt register. Enable Timer 1 overflow, all other interrupts are disabled
INTCON = %11000000 ' Global interrupt register. Enable allowed periferal interrupts.
Lcd_Init() ' Initialize Lcd
delay_ms(100) ' wait for the lcd module stabilization
Lcd_Cmd(_LCD_CLEAR) ' Clear display
Lcd_Cmd(_LCD_CURSOR_OFF) ' Cursor off
if PORTB.2 = 1 then ' check RB2 prescaler switch S2
prescaler = 64 ' select prescaler mode 1/64
LCD_OUT (2, 1, "1/64" )
PORTA.6 = 0 ' turn on MB506
else
prescaler = 1 ' select prescaler mode 1/1
PORTA.6 = 1 ' turn off MB506
end if
while(1) ' main program cycle
cnt = 0 ' zero cnt variable
TMR1H = 0x00 ' zero 16 bit Timer 1 values
TMR1L = 0x00
if PORTB.3 = 1 then ' if 100ms window selected on S1
message = " 100ms" ' display 100ms on LCD
TIMER_START = %00110111 ' Timer 1 start value: timer is started, external clock on RB6 not in sync with crystal oscillator, 1:8 prescale
TIMER_STOP = %00110110 ' Timer 1 stop value: timer is stopped, external clock on RB6 not in sync with crystal oscillator, 1:8 prescale
GIE_bit = 1 ' enable all interrupts
T1CON = TIMER_START ' start Timer 1
for n = 0 to 2435 ' create custom 100ms delay window
next n
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
T1CON = TIMER_STOP ' stop Timer 1
GIE_bit = 0 ' disable interrupts
else ' if 100ms window selected
TIMER_START = %00000111 ' Timer 1 start value: timer is started, external clock on RB6 not in sync with crystal oscillator, 1:1 prescale
TIMER_STOP = %00000110 ' Timer 1 stop value: timer is stopped, external clock on RB6 not in sync with crystal oscillator, 1:1 prescale
message = "1000ms" ' display 1000ms on LCD
GIE_bit = 1 ' enable all interrupts
T1CON = TIMER_START ' start Timer 1
delay_us(999999) ' create 1000ms delay window
T1CON = TIMER_STOP ' stop Timer 1
GIE_bit = 0 ' disable interrupts
end if
freq = TMR1L + TMR1H*256 ' calculate 16 bit frequency variable
if PORTB.3 = 1 then ' calculate frequency 32 bit variable
freq1 = freq*80*prescaler + 65536*80 * cnt * prescaler ' if window duration is 100ms
else
freq1 = freq * prescaler + 65536 * cnt * prescaler ' if window duartion is 1000ms
end if
' Extract frequency on LCD
tens_of_MHz: ' extract megahertz
ch = freq1 div 100000000
if ch>0 then
LCD_Chr(1, 1, 48+ch)
else
LCD_Chr(1, 1, " ")
end if
MHz:
ch1 = (freq1 div 10000000) mod 10
if ch1>0 then
LCD_Chr(1, 2, 48+ch1)
else
if ch>0 then
LCD_Chr(1, 2, "0")
else
LCD_Chr(1, 2, " ")
end if
end if
ch2 = (freq1 div 1000000) mod 10
if ch2>0 then
LCD_Chr_CP(48+ch2)
LCD_Chr_CP (".")
LCD_OUT(1, 14, "MHz")
goto hundred
else
if ch>0 then
LCD_Chr(1, 3, "0")
LCD_Chr_CP (".")
LCD_OUT(1, 14, "MHz")
goto hundred
end if
if ch1>0 then
LCD_Chr(1, 3, "0")
LCD_Chr_CP (".")
LCD_OUT(1, 14, "MHz")
goto hundred
end if
LCD_OUT(1, 14, "KHz")
end if
LCD_OUT(1, 3, " ")
LCD_OUT(1, 14, "KHz")
hundred: ' extract thousands
ch = (freq1 div 100000) mod 10
LCD_Chr (1, 5, 48+ch)
ch = (freq1 div 10000) mod 10
LCD_Chr_CP (48+ch)
ch = (freq1 div 1000) mod 10
LCD_Chr_CP (48+ch)
ten: ' extract tens
if prescaler > 1 then
goto message
end if
LCD_Chr_CP (".")
ch = (freq1 div 100) mod 10
LCD_Chr_CP (48+ch)
ch = (freq1 div 10) mod 10
LCD_Chr_CP (48+ch)
ch = freq1 mod 10
LCD_Chr_CP (48+ch)
message:
LCD_OUT(2,11, message)
delay_ms(100) ' wait 100ms before next loop for proper LCD update
wend
end.Thank you in Advance
