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BASCOM AVR, help reference (2007).PDF

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Input	Z: SRAM-Address of buffer	X: Address of Long-variable with
	*)	sectornumber
Output	r25: Errorcode	C-Flag: Set on Error

This is not the address of wSRAMPointer, it is its content, which is the starting-address of the buffer.

Partial Example

Dim bError as Byte

Dim aBuffer(512)as Byte' Hold Sector to and from CF-Card

Dim wSRAMPointer as Word' Address-Pointer for write

Dim lSectorNumber as Long' Sector Number

'give Address of first Byte of the 512 Byte Buffer to Word-Variable wSRAMPointer =VarPtr(aBuffer(1))

'Set Sectornumber, sector 32 normally holds the Boot record sector of first partition lSectorNumber = 32

'Now read in sector 32 from CF-Card

bError = DriveReadSector( wSRAMPointer , lSectorNumber) ' Now Sector number 32 is in Byte-Array bBuffer

DriveWriteSector

Action

Write a Sector (512 Bytes) to the (Compact Flashcard-) Drive

Syntax

bErrorCode = DRIVEWRITESECTOR(wSRAMPointer, lSectorNumber)

Remarks

bErrorCode

A Byte Variable, which is assigned with the error code of the function

wSRAMPointer A Word Variable, which contains the SRAM address (pointer), from which the Sector to the Drive should be written

lSectorNumbe A Long Variable, which give the sector number on the drive to transfer. r

Writes a Sector (512 Bytes) from SRAM starting at the address, to which the content of the variable wSRAMPointer is pointing to the Drive to sector number lSectornumber. The functions returns 0 if no error occurred. For Error code see section Error codes.

For the meaning of wSRAMPointer see Note in DriveReadSector

DTMFOUT

Action

Sends a DTMF tone to the compare1 output pin of timer 1.

Syntax

DTMFOUT number, duration

DTMFOUT string , duration

Remarks

Number	A variable or numeric constant that is equivalent with the number of your
	phone keypad.
Duration	Time in mS the tone will be generated.
string	A string variable that holds the digits to be dialed.

The DTMFOUT statement is based on an Atmel application note (314).

It uses TIMER1 to generate the dual tones. As a consequence, timer1 can not be used in interrupt mode by your application. You may use it for other tasks.

page -472-

Since the TIMER1 is used in interrupt mode you must enable global interrupts with the statement ENABLE INTERRUPTS. The compiler could do this automatic but when you use other interrupts as well it makes more sense that you enable them at the point where you want them to be enabled.

The working range is from 4 MHz to 10 MHz system clock(xtal).

The DTMF output is available on the TIMER1 OCA1 pin. For a 2313 this is PORTB.3.

Take precautions when connecting the output to your telephone line.

Ring voltage can be dangerous!

System Resources used

TIMER1 in interrupt mode

See also

NONE

ASM

The following routine is called from mcs.lib : _DTMFOUT

R16 holds the number of the tone to generate, R24-R25 hold the duration time in mS. Uses R9,R10,R16-R23

The DTMF table is remarked in the source and shown for completeness, it is generated by the compiler however with taking the used crystal in consideration.

Example

'-----------------------------------------------------------------------------
------------	: dtmfout.bas
'name	: dtmfout.bas
'copyright	: (c) 1995-2005, MCS Electronics
'purpose	: demonstrates DTMFOUT statement based on AN 314
from Atmel	: Mega48
'micro	: Mega48
'suited for demo	: yes
'commercial addon needed	: no
'-----------------------------------------------------------------------------
------------
$regfile = "m48def.dat"	' specify the used
micro	' used crystal
$crystal = 8000000	' used crystal
frequency	' use baud rate
$baud = 19200	' use baud rate
$hwstack = 32	' default use 32
for the hardware stack	' default use 10
$swstack = 10	' default use 10
for the SW stack	' default use 40
$framesize = 40	' default use 40
for the frame space
	page -473-

'since the DTMFOUT statement uses the TIMER1 interrupt you must enable 'global interrupts

'This is not done by the compiler in case you have more ISRs

Enable Interrupts

'the first sample does dtmfout in a loop

Dim Btmp As Byte , Sdtmf As String * 10

Sdtmf = "12345678"		' number to dial
Do
Dtmfout Sdtmf , 50		' lets dial a
number	^ duration is 50 mS for each digit
'	^ duration is 50 mS for each digit	' wait for one
Waitms 1000		' wait for one
second

'As an alternative you can send single digits

'there are 16 dtmf tones

For Btmp = 0 To 15					' dtmf out on
	Dtmfout Btmp , 50				' dtmf out on
PORTB.3 for the 2313					for 500 mS
	'output is on the OC1A output pin
	Waitms 500				' wait 500 msec
Next
Loop
End
'the keypad of most phones looks like this :
'1	2	3	optional are A
'4	5	6			B
'7	8	9			C
'*	0	#			D
'the DTMFOUT translates a numeric value from 0-15 into :
' numeric value				phone key
'	0				0
'	1				1
'	2				2
'	3				3
' etc.					9
'	9				9
'	10				*
'	11				#
'	12				A
'	13				B
'	14				C
'	15				D

ECHO

Action

Turns the ECHO on or off while asking for serial INPUT.

Syntax

page -474-

ECHO value

Remarks

Value	ON to enable ECHO and OFF to disable ECHO.

When you use INPUT to retrieve values for variables, all info you type can be echoed back. In this case you will see each character you enter. When ECHO is OFF, you will not see the characters you enter.

In versions 1.11.6.2 and earlier the ECHO options were controlled by an additional parameter on the INPUT statement line like : INPUT "Hello " , var NOECHO

This would suppress the ECHO of the typed data. The new syntax works by setting ECHO ON and OFF. For backwards compatibility, using NOECHO on the INPUT statement line will also work. In effect it will turn echo off and on automatic.

By default, ECHO is always ON.

See also

INPUT

ASM

The called routines from mcs.lib are _ECHO_ON and _ECHO_OFF

The following ASM is generated when you turn ECHO OFF.

Rcall Echo_Off

This will set bit 3 in R6 that holds the ECHO state.

When you turn the echo ON the following code will be generated

Rcall Echo_On

Example

'-----------------------------------------------------------------------------
------------	: input.bas
'name	: input.bas
'copyright	: (c) 1995-2005, MCS Electronics
'purpose	: demo: INPUT, INPUTHEX
'micro	: Mega48
'suited for demo	: yes
'commercial addon needed	: no

'-----------------------------------------------------------------------------

------------

$regfile = "m48def.dat"	' specify the used
micro	' used crystal
$crystal = 4000000	' used crystal
frequency	' use baud rate
$baud = 19200	' use baud rate
$hwstack = 32	' default use 32
for the hardware stack	' default use 10
$swstack = 10	' default use 10
for the SW stack	' default use 40
$framesize = 40	' default use 40

page -475-

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Calls	_DriveWriteSector
Input	Z: SRAM-Address of buffer	X: Address of Long-variable with
	*)	sectornumber
Output	r25: Errorcode	C-Flag: Set on Error