Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 98)

RPBASIC-52 PROGRAMMING GUIDE

2-79

PEEKF

Syntax: PEEKF(segment,ad dress)

Where: segment = 0 to 7, specifies a 64K segment

address = 0 to 65535, byte address in a segment

Function: Reads a floating point number from RAM. Floating point range is + /- 1E-127 to +/-

0.99999999E+127

Mode: Command, Run

Use: A = PEEK F(1,AD)

Cards: All

DESCRIPTION

This function is used in conjunction with POKE F. Data is retrieved from any memory location. PEEK F

retrieves a floating point number saved by POKE F.

PEEKF can access up to 512K of ram by selecting a segment and an address. A segment selects a 64K block

while the address selects a location within this block.

Each floating point num ber req uires 6 bytes. address must be increme nted in dexed 6 bytes for eac h value.

See POKEB and POKEF commands for addressing and segment info.

POKEF

ERRORS

BAD SYNTAX If B, segment, or address is missing.

BAD DATA If segment is > 7, or address > 65535

EXAMPLE

The following example reads the A -D port, multiplies it by a constant, and saves it to RAM. The values are

then retrieved and printed back.

10 FOR N=0 TO 500

20 A = AIN(1) * 0.2344

20 POKE F1,N*6,A

30 NEXT

40 FOR N=0 TO 500

50 A=PEEK F(1,N*6)

60 PRINT A,

70 NEXT

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 162 163

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Remote-processing BASIC 52 Uživatelský manuál Strana 98