' ********************************************************************** ' * File: uk_BASAVR_060.BAS * ' * Version: 1.1 * ' * Date: 26.02.12 * ' * 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 060 of BASCOM AVR course. ' A/D converter: perform averaged conversion for each key pressure. ' The program compute the average of 8 conversions, of one analog input of Mini ' Module, in corrispondence of a key pressure and then it shows the result ' either under numeric combination and voltage formats. ' The conversion is executed with the A/D converter section of microcontroller, ' that has the following features: ' - 10 bits maximum resolution; ' - programmable conversion time up to a minimum value of 13 usec; ' - successive approximation conversion technique; ' - analog sample & hold that reduce conversions noise; ' - 8 different inputs, multiplexed; ' - voltage applicable to analog inputs: 0÷Vref; ' - internal or external reference voltage Vref, variable in the 0÷5.0 V range; ' This program converts only one of the 8 analog inputs available on GMM AM08 ' Mini Module, as described in following definitions. The program uses the ' internally generated reference voltage Vref, as it is more stable than those ' supplied by GMM TST3 (resistor divider on power supply voltage). ' The program describes its functionalities and shows conversions on 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!! ' ' Added instructions: None. ' ' 26.02.12: uk_BASAVR_060.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, copy it if not present and then restart the IDE. ' 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 configured as below described: ' J1 N.C. ; J2 in 1-2 ; J3 in 1-2 ; J5 in 2-3 ; J7 in 2-3 ; J8 in 2-3 ' J9 in 2-3 !!! ' ' GMM TST3 pin Z2 pin Signal Used uP ' resource GMM TST3 GMM AM08 GMM AM08 signal ' CN4.2 33 27 ADC7 ADC7 ' CN4.17 20 14 GND GND ' ' 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. 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 Qadc = 2.56 / 1023 ' A/D converter resolution with full scale voltage=Vref=2.56 V '************************* Variables declaration ******************************* Dim Choice As Byte ' Operation selected on console Dim Chadc As Byte ' Channel of A/D converter section Dim Cmbadc As Word ' Combination obtained from A/D converter Dim Ncnv As Byte ' A/D conversions number for average Dim Idxadc As Byte ' A/D conversions index for average Dim Avgshift As Byte ' Number of bits to shift in order to obtain conversions average Dim Sumadc As Word ' A/D conversions sum for average Dim Avgadc As Word ' Averaged combination obtained from A/D converter Dim Voltadc As Single ' Voltage acquired from A/D converter Dim Gstr As String * 6 ' String used to visualize formatted voltage '************************ Subroutines declaration ****************************** Declare Sub Ini_adc() ' Initialize A/D converter section Declare Sub Getavg_adc(byval Chadc As Byte , Byval Ncnv As Byte) ' Acquire A/D converter input with average '****************************** Main program *********************************** Main: Pinrx = 0 ' Initialize signals for serial communication Pintx = 0 ' as digital inputs Ncnv = 8 ' Conversion number for A/D average (multiple of 2, <=64) Print ' Separate from previous visualization by showing 2 empty new line on console Print Print " Averaged conversion of GMM AM08 analog input with key pressure" Print "Mount Mini Module on Z2 of GMM TST3, connect analog input to convert" Print "between pins 17 (GND) and 2 (ADC7) on CN4 of GMM TST3." Print "When a key is pressed on the console, the analog input is converted " ; Ncnv Print "times and the obtained averaged combination is displayed on the console" Print "together with relative voltage." Print Print "Acquired combination from ADC7 (points = voltage)" Call Ini_adc() ' Initialize lines and A/D converter section, used by program Do ' Begin endless loop Choice = Waitkey() ' Wait key pressure on console Call Getavg_adc(7 , Ncnv) ' Acquire ADC7 channel of A/D converter with average on Ncnv conversions Print Avgadc; ' Show averaged combination obtained by conversion Voltadc = Avgadc ' Obtain voltage from averaged combination Voltadc = Voltadc * Qadc ' Through resolution Gstr = Fusing(voltadc , "0.###") ' Format voltage with one integer digits and three decimals Print " = " ; Gstr ; " V " ' Show formatted voltage and measure unit Loop ' End endless loop End '*************************** End of main program ******************************* '*********************** Subroutines used by program *************************** ' Initialize resources, variables and peripheral devices used for A/D conversion. ' Input: None ' Output: None Sub Ini_adc() ' The used A/D signal (ADC7) doesn't have multifunctions and thus it must not ' be set as input without pull up ' Define conversion on request, Prescaler=64 (50% of clock A/D), internal Vref=2,56V Config Adc = Single , Prescaler = 64 , Reference = Internal_2.56 Start Adc ' Enable A/D converter section End Sub ' Perform a serie of conversions on one A/D converter input, in polling modality ' and it returns the obtained 10 bits averaged combination. ' Input: Chadc = channel to convert ' Ncnv = number of conversion for average (multiple of 2, <=64) ' Output: Avgadc = combination obtained from conversion Sub Getavg_adc(byval Chadc As Byte , Byval Ncnv As Byte) ' Calculate number of bits to shift, in order to obtain averaged conversions Avgshift = 0 ' Reset number of bits to shift Idxadc = Ncnv ' Copy number of conversions for average Do Incr Avgshift ' Increase number of bits to shift Shift Idxadc , Right , 1 ' Shift copy number of conversion for average Loop Until Idxadc <= 1 ' Repeat until conversions completed Sumadc = 0 ' Clear sum of A/D converter combinations for average For Idxadc = 1 To Ncnv ' Repeat cycle for average conversion number Cmbadc = Getadc(chadc) ' Convert A/D converter channel for average Sumadc = Sumadc + Cmbadc ' Update sum of A/D converter combinations for average Next Idxadc Avgadc = Sumadc ' Obtain average from sum of A/D converter combinations Shift Avgadc , Right , Avgshift ' by shifting the sum of the calculated number of bits (=divide End Sub ' for the average conversions number) '******************* End of subroutines used by program ************************