' ********************************************************************** ' * File: uk_BASAVR_040.BAS * ' * Version: 1.1 * ' * Date: 31.01.11 * ' * Development Tools: Bascom-AVR Demo Ver. 1.11.9.1 + * ' * + AVR bootloader grifo(r) Ver. 1.2 * ' * Cards: GMM AM08 + GMM TST3 * ' * Developed by: GRIFO(r) Italian Technology * ' * via Dell'Artigiano 8/6 * ' * 40016 S. Giorgio di Piano (BO) * ' * Tel. +39 051 892052 Fax. +39 051 893661 * ' * http://www.grifo.com http://www.grifo.it * ' * Author: Gianluca Angelini * ' ********************************************************************** ' Example program 40 of BASCOM AVR course. ' Frequency meter. ' The program measures the frequency of the input signal of TIMER1 used as ' 16 bits counter. The frequency is calculated as number of occurred transitions ' in a time unit equal to 0.25 seconds, and it is continuously displayed on ' serial console. By pressing T12 button of a TIO 16, connected to CN4 connector ' of GMM TST3, it is changed the measured signal. ' The program describe its functionalities and uses a serial console provided ' of monitor and keyboard with a fixed physical protocol at 19200 Baud, 8 Bit ' x chr, 1 Stop bit, No parity. ' This console can be another system capable to support a serial RS 232 ' communication. In order to simplify the use it can be used a PC provided of ' one COMx line, that execute a terminal emulation program as HYPERTERMINAL or ' the homonym modality provided by BASCOM AVR (see IDE Configuration). ' The program works only when the GMM AM08 is mounted on Z2 socket of GMM TST3!! ' Inside the program the terms that identify the used signals refers to electric ' diagram and technical manual of GMM TST3!! ' ' Added instructions: none. ' ' 31/01/11: uk_BASAVR_040.BAS - Ver 1.1 - By G.A. ' First version. ' ' '**************************** IDE Configurations ******************************* ' NOTE: in order to coorectly use this demo program, please execute the following ' steps: ' 1) Check the availability of M8DEF.DAT file into the directory where the ' BASCOM AVR is installed and copy it if not present. ' 2) Into the window "Options | Compiler | Chip" set: ' Chip: m8def.dat ' XRAM: None ' HW Stack: 64 ' Soft Stack: 32 ' Framesize: 64 ' XRAM waitstate: disabled ' External Access Enable: disabled ' 3) Into the window "Options | Communication" set: ' COM port = the PC line connected to GMM AM08, through GMM TST3 ' Baudrate = 19200 ' Parity = None ' Databits = 8 ' Stopbit = 1 ' Handshake = None ' Emulation = TTY ' Font = Terminal, Normal, 12 points, white colour ' Backcolor = Navy ' 4) At the end of compilation, after the code is programmed on GMM AM08, open ' the terminal emulation window of BASCOM AVR with the option: Tools | ' Terminal emulator (Ctrl+T) and then reset or powen on the Mini Module. '************************* Compiler directives ********************************* $regfile "M8DEF.DAT" ' Definitions file for used microcontroller $romstart = &H0 ' Code start address on FLASH $crystal = 7372800 ' Microcontroller crystal frequency $hwstack = 64 ' Hardware stack space $swstack = 32 ' Software stack space $framesize = 64 ' Frame space $map ' Generate debug information $baud = 19200 ' Serial communication speed: 19200 Baud ' Other parameters fixed to: 8 bit x chr ' 1 Stop bit ' No parity '******************************* Definitions *********************************** ' The resources used by program are connected as described in following table. ' !!! Note: On GMM TST3 the jumpers must be set in following positions: ' J1 in 2-3 ; J2 in 1-2 ; J3 in 1-2 ; J5 in 2-3 ; J7 in 2-3 ; J8 in 2-3 ' J9 in 2-3 !!! ' ' TIO 16 GMM TST3 pin Z2 pin Signal Signal ' button resource GMM TST3 GMM AM08 GMM AM08 uP ' T12 CN4.14 22 16 PD5 T1 T1 ' ' Signal pin COMx pin CN5 pin Z1 pin Signal Signal ' PC DB9 GMM TST3 GMM TST3 GMM AM08 GMM AM08 uP ' TX 3 3 9 3 RxD RS232 PD0 ' RX 2 2 10 4 TxD RS232 PD1 ' GND 5 5 20 14 GND - ' This table shows that the connection cable between PC COM line and CN5 of ' GMM TST3 is a normal pin to pin cable or direct. Grifo(r) can supply it by ' requesting the CCR 9+9E code. Pint12 Alias Ddrd.5 ' Bit with diretion signal connected to yellow button T12 of TIO 16 Pinrx Alias Ddrd.0 ' Bit with direction signal connected to GMM AM08 RxD Pintx Alias Ddrd.1 ' Bit with direction signal connected to GMM AM08 TxD '************************* Constants declaration ******************************* Const Cret = &H0D ' Carriage Return ASCII code Const Dtfreq = 0.25 ' Time unit for frequency measure, in seconds Const Delfreq =(dtfreq * 1000) - 6 ' Delay for frequency measure, in milliseconds '************************* Variables declaration ******************************* Dim Count1 As Word ' Current variations counted by TIMER1 Dim Oldcount1 As Word ' Previous variations counted by TIMER1 Dim Dtcount1 As Word ' Variations number in the time unit Dim Freq As Single ' Variable for measured frequency '************************ Subroutines declaration ****************************** Declare Sub Get_cnt1() ' Acquire valid counter from TIMER1 '****************************** Main program *********************************** Main: Pinrx = 0 ' Initialize signals for serial communication Pintx = 0 ' as digital inputs Pint12 = 0 ' Initialize signal connected to T12 of TIO 16 as digital input Print ' Separate from previous visualization by showing an empty new line Print Print " Measure frequency of T1 input signal of TIMER1" Print "Mount Mini Module on Z2 of GMM TST3, connect TIO 16 to CN4 and press T12 button." ' Obtain and show on console the features of performed measure Freq = 1 / Dtfreq ' Obtain resolution of the frequency measure Print "The measure has a resolution=" ; Freq ; " Hz and F.max="; Freq = 65535 * Freq ' Obtain maximum measurable frequency Print Freq ; " Hz" Print "Measured frequency (Hz):" ' Arrange TIMER1 for the frequency measure Config Timer1 = Counter , Edge = Falling , Noise Cancel = 0 ' TIMER1 as 16 bit counter on falling edge without filter Counter1 = 0 ' Reset TIMER1 counter Oldcount1 = 0 ' Reset previous counter of TIMER1 Start Counter1 ' Start TIMER1 counter Do ' Begin endless loop ' The frequency measure is performed by counting the variations number of ' the signal occurred in a time unit, related to one second. When, for ' example, the time unit is 1/4=0,25 seconds and in this time the timer ' counts 100 variations, then the frequency will be 100/0,25=400 Hz. ' It is advantageous select a low time unit, in order to increase the ' maximum measurable frequency; this coincides with the 65.535 maximum ' variations of 16 bits counter in the same time unit. The previous ' instructions calculate and visualize either the resolution and maximum ' frequency, just obtained from the selected time unit, defined by the ' program constant Dtfreq. ' The time unit is performed with a delay that take into account even the ' processing time required to calculate the frequency, experimentally ' calibrated. Call Get_cnt1() ' Acquire valid counter from TIMER1 Dtcount1 = Count1 - Oldcount1 ' Obtain variation number in the time unit Oldcount1 = Count1 ' Update previous counter of TIMER1 Freq = Dtcount1 ' Obtain frequency from variation number Freq = Freq / Dtfreq ' in the time unit Print Freq ; " "; ' Show obtained frequency on console Printbin Cret ' Mantain visualization on same row Waitms 50 ' Delay between acquisition Loop ' End endless loop Stop Counter1 ' Stop TIMER1 counter End '*************************** End of main program ******************************* '*********************** Subroutines used by program *************************** ' Acuire current counter from TIMER1 by ensuring that read value has no aliasing ' problem caused by less significant byte overflow. ' This subroutine coincides with instruction Counter1 of BASCOM AVR and it has ' been developed for compatibility and code exchange with other Mini Modules. ' Input: None ' Output: Count1 = Current 16 bits value of TIMER1 Sub Get_cnt1() Count1 = Counter1 End Sub '******************* End of subroutines used by program ************************