' ****************************************************************
' * File:  uk_gmb_iot.pbas  -  Ver. 1.1                          *
' * Compiler: mikroBasic for PIC by mikroElektronica             *
' * IDE: mikroBasic for PIC by mikroElektronica                  *
' * Compiler Version: 1.1.5.0                                    *
' * Boards: GMM 4620 + GMB HR168                                 *
' *   GRIFO(R)   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  *
' * by Graziano Gaiba                          del 22.02.05      *
' ****************************************************************
'
' This demo allows to use immediatly TTL I/O digital lines available
' on CN7. The list of lines existing is printed. After selecting the
' line to use it can be managed as input (its status is shown
' continuously on console) or as output (setting it high or low).
' Should the line selected be associated to Real Time Clock, this
' peripheral manages it.
'
'
' Rel 1.1 - by Graziano Gaiba
' Demo program of TTL I/O digital lines of GMB HR168 driven by
' Mini Module GMM 4620
'
'
' ******************** Compiler definitions **********************
'
program uk_gmb_iot
'
' ******************* Constants declaration **********************
'
const ASC_5 = 53
const ASC_4 = 52
const ASC_3 = 51
const ASC_2 = 50
const ASC_1 = 49
const ASC_0 = 48
'
' ******************** Variables declaration *********************
'
' Generic variables
dim i as byte
dim scelta as byte
dim d_out as byte
'
'
'
' **************** Procedures definition ******************
'
'
' CPU and signals directions initialization
sub procedure Init_cpu
    ADCON1=$0f        ' Imposta come I/O digitale i pin AN0..12
    CMCON=$07         ' Imposta come I/O digitale RA0..4
' Optocoupled Inputs of CN1 are:
' IN1-1 <-> RA0
' IN2-1 <-> RA1
' IN3-1 <-> RB0
' IN4-1 <-> RB1
' IN5-1 <-> RA4
' IN6-1 <-> RC0
' IN7-1 <-> RC1
' IN8-1 <-> RC5
    trisa.0=1
    trisa.1=1
    trisa.4=1
    trisb.0=1
    trisb.1=1
    trisc.0=1
    trisc.1=1
    trisc.5=1
' Optocoupled Inputs of CN2 are:
' IN1-2 <-> RD0
' IN2-2 <-> RD1
' IN3-2 <-> RD2
' IN4-2 <-> RD3
' IN5-2 <-> RD4
' IN6-2 <-> RD5
' IN7-2 <-> RD6
' IN8-2 <-> RD7
    trisd=$ff
' Relay outputs of CN3 are:
' OUT A1 <-> RB4
' OUT A2 <-> RB5
' OUT B1 <-> RB6
' OUT B2 <-> RB7
' OUT C1 <-> RB3
' OUT C2 <-> RB2
    trisb=trisb and $03
' Relay outputs of CN4 are:
' OUT D1 <-> RA3
' OUT D2 <-> RC2 (J10 in position 3-4)
    trisa.3=0
    trisc.2=0
    ' Initialize module USART (8 bit, 19200 baud rate,
    ' no parity)
    Usart_init(19200)
end sub
'
'
' Send a string of characters to the serial port
sub procedure print_USART(dim byref txt as char[255])
    dim i as byte
    dim l as byte

    l = txt[0]
    for i = 1 to l
        USART_Write(txt[i])
    next i
end sub
'
'
' Send CR + LF
sub procedure print_CRLF
    USART_Write(10)
    USART_Write(13)
end sub
'
'
' Clear screen, sending 25 times CR + LF.
sub procedure clrscr
    for i = 0 to 24
    print_CRLF
    next i
end sub
'
'
' Asks for a key press
sub procedure wait_key
    dim c as byte

    print_usart("Press a key...")
    do
        nop
    loop until USART_Data_Ready = 1
    c = USART_Read
end sub
'
'
' Procedure to set the status of the relays on connectors CN3 and CN4.
' According to the bits of port_val, each relay is turned ON
' (contact closed) or OFF (contact open).
' Bits of port_val have this meanging:
' -- CN3
' port_val.0 drives relay OUT A1
' port_val.1 drives relay OUT A2
' port_val.2 drives relay OUT B1
' port_val.3 drives relay OUT B2
' port_val.4 drives relay OUT C1
' port_val.5 drives relay OUT C2
' -- CN4
' port_val.6 drives relay OUT D1
' port_val.7 drives relay OUT D2
'
' Each bit has the following meaning:
'   bit              Meaning
'    0    Relay turned OFF (contact open)
'    1    Relay turned ON (contact closed)
sub procedure set_relays(dim port_val as byte)
' Relays are driven in complemented logic, so port_val must be
' complemented too
    port_val=port_val xor $ff
    portb.4=port_val.0
    portb.5=port_val.1
    portb.6=port_val.2
    portb.7=port_val.3
    portb.3=port_val.4
    portb.2=port_val.5

    porta.3=port_val.6

    portc.2=port_val.7
end sub
'
'
' Inputs a positive decimal vale of up to five digits.
' Input parameter is number of digits, it returns a word
' containing the value input by te user.
' It can manage backspace (ASCII 08) and accepts digits from
' '0' to '9'.
' It sends a bell character (ASCII 07) when receives a character
' not acceptable for input, or user tries to input or delete out
' of possible range.
sub function inputDEC(dim n_char as byte) as word
    dim str_input as byte[6]
    dim idx as byte
    dim chr_input as byte
    dim pow_of_10 as word[5]
    dim value as word

    pow_of_10[1] = 1
    pow_of_10[2] = 10
    pow_of_10[3] = 100
    pow_of_10[4] = 1000
    ' Index must start from 1
    idx = 1
    Inc(n_char)
    ' No character in input
    chr_input = 0
    ' Starting value
    value = 0
    ' Loop until CR is received
    while chr_input <> 13
        ' If a data is ready
        if usart_data_ready = 1 then
            ' Read it
            chr_input = USART_Read
            ' If backspace (ASCII BS)
            if chr_input = 8 then
                ' and buffer is not empty
                if idx > 1 then
                    ' Send data read
                    USART_Write(chr_input)
                    ' Delete character
                    USART_Write(32)
                    USART_Write(chr_input)
                    ' delete last input data
                    Dec(idx)
                else
                    ' Bell to indicate an error
                    USART_Write(7)
                end if
            end if
            ' If CR received, elaborate the value and return it
            if chr_input = 13 then
                n_char = 0
                while idx > 1
                    Dec(idx)
                    Inc(n_char)
                    value = value + (str_input[n_char] - 48) * pow_of_10[idx]
                wend
            else
                ' If character can be input
                if idx < n_char then
                    ' If data received is in valid range:
                    ' 0..9
                    if (chr_input >= 48) or(chr_input <= 57) then
                        ' Send data read
                        USART_Write(chr_input)
                        ' Store it in input buffer
                        str_input[idx] = chr_input
                        ' Point to next position
                        Inc(idx)
                    end if
                else
                    ' Bell to indicate an error
                    USART_Write(7)
                end if
            end if
        end if
    wend
    print_CRLF
    Result = value
end sub
'
'************************** Main Program *******************************
'
main:
    Init_cpu
    ' Turn OFF relays
    set_relays(0)
for_ever:
    clrscr
    print_USART("TTL I/O on CN7 demo Rel 1.1 for GMM 4620 rel 120304 and GMB HR168 rel 110104")
    print_CRLF
    print_CRLF
    print_USART("If selected as input, its status in shown continuously, press a key to exit")
    print_CRLF
    print_USART("If selected as output, press 1 to set, 0 to reset, any other number to exit")
    print_CRLF
    print_CRLF
    print_USART("1) pin 2 of CN7") ' RE0
    print_CRLF
    print_USART("2) pin 3 of CN7") ' RE1
    print_CRLF
    print_USART("3) pin 4 of CN7") ' /INTRTC
    print_CRLF
    print_USART("4) pin 6 of CN7") ' RC2
    print_CRLF
    print_USART("5) pin 8 of CN7") ' RA5
    print_CRLF
    print_CRLF
    print_USART("Choice: ")
input_scelta:
    do
        nop
    loop until USART_Data_Ready = 1
    scelta = USART_Read
    if (scelta < ASC_1) or (scelta > ASC_5) then
        goto input_scelta
    end if
    print_CRLF
    print_CRLF
    print_USART("1) Input")
    print_CRLF
    print_USART("2) Output")
    print_CRLF
input_scelta_dir:
    do
        nop
    loop until USART_Data_Ready = 1
    i = USART_Read
    if (i < ASC_1) or (i > ASC_2) then
        goto input_scelta_dir
    end if
    print_CRLF
    if i = 1 then
        print_USART("Input")
    else
        print_USART("Output")
    end if
    print_CRLF
scelta_loop:
    ' pin 2 of CN7 - RE0
    if scelta = ASC_1 then
        if i = ASC_1 then
            trise.0 = 1
            do
                print_USART("Status: ")
                if porte.0 = 0 then
                    USART_Write(ASC_0)
                else
                    USART_Write(ASC_1)
                end if
                USART_Write(13)
            loop until USART_Data_Ready = 1
            i = USART_Read
        else
            trise.0 = 0
            do
                print_USART("Status: ")
                d_out = inputDEC(1)
                if (d_out = 0) or (d_out = 1) then
                    porte.0 = d_out.0
                end if
            loop until (d_out <> 0) and (d_out <> 1)
        end if
    end if
    ' pin 3 of CN7 - RE1
    if scelta = ASC_2 then
        if i = ASC_1 then
            trise.1 = 1
            do
                print_USART("Status: ")
                if porte.1 = 0 then
                    USART_Write(ASC_0)
                else
                    USART_Write(ASC_1)
                end if
                USART_Write(13)
            loop until USART_Data_Ready = 1
            i = USART_Read
        else
            trise.1 = 0
            do
                print_USART("Status: ")
                d_out = inputDEC(1)
                if (d_out = 0) or (d_out = 1) then
                    porte.1 = d_out.0
                end if
            loop until (d_out <> 0) and (d_out <> 1)
        end if
    end if
    ' pin 4 of CN7 - /INTRTC
    if scelta = ASC_3 then
       print_USART("Pin 4 is connected to Real Time Clock interrupt. It can:")
       print_CRLF
       print_USART("generate square waves; activate every enth,second,minute,hour,day")
       print_CRLF
       print_USART("or at a preset time.")
       print_CRLF
       print_USART("LED LD28 shows its status.")
       print_CRLF
       wait_key
    end if
    ' pin 6 of CN7 - RC2
    if scelta = ASC_4 then
        if i = ASC_1 then
            trisc.2 = 1
            do
                print_USART("Status: ")
                if portc.2 = 0 then
                    USART_Write(ASC_0)
                else
                    USART_Write(ASC_1)
                end if
                USART_Write(13)
            loop until USART_Data_Ready = 1
            i = USART_Read
        else
            trisc.2 = 0
            do
                print_USART("Status: ")
                d_out = inputDEC(1)
                if (d_out = 0) or (d_out = 1) then
                    portc.2 = d_out.0
                end if
            loop until (d_out <> 0) and (d_out <> 1)
        end if
    end if
    ' pin 8 of CN7 - RA5
    if scelta = ASC_5 then
        if i = ASC_1 then
            trisa.5 = 1
            do
                print_USART("Status: ")
                if porta.5 = 0 then
                    USART_Write(ASC_0)
                else
                    USART_Write(ASC_1)
                end if
                USART_Write(13)
            loop until USART_Data_Ready = 1
            i = USART_Read
        else
            trisa.5 = 0
            do
                print_USART("Status: ")
                d_out = inputDEC(1)
                if (d_out = 0) or (d_out = 1) then
                    porta.5 = d_out.0
                end if
            loop until (d_out <> 0) and (d_out <> 1)
        end if
    end if

    goto for_ever
end.