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ADDS-2171-EZ-ICE

ADSP-2100 Family Development Tools

Analog Devices 

ADDS-21xx-TOOLS

C RUNTIME LIBRARY

The C Compiler comes with ANSI-standard functions and a set

of C-callable library routines commonly used in digital signal

processing to speed up development.

The ADSP-2100 Family C Runtime Library includes the ANSI-

standard and DSP-specific functions listed in Table I.

Table I. C Runtime Library Functions

Function Description

abs

acos

asin

atan

atan2

ceil

cos

cosh

exp

fabs

fir

floor

fmod

frexp

ifftN

iir

interrupt

isalpha

isdigit

labs

ldexp

log

log10

memcmp

memcpy

memset

modf

pow

raise

signal

sin

sinh

sqrt

strcat

strcmp

strcpy

strlen

strncat

strncmp

strncpy

tan

tanh

timer_off

timer_on

timer_set

va_arg

va_end

va_start

absolute value

arc cosine

arc sine

arc tangent

arc tangent of quotient

ceiling

cosine

hyperbolic cosine

exponential

absolute value

finite impulse response (FIR) filter

floor

floating-point modulus

separate fraction and exponent

N-point inverse fast Fourier transform (IFFT)

infinite impulse response (IIR) filter

define interrupt handling

detect alphabetic character

detect decimal digit

absolute value

multiply by power of 2

natural logarithm

base 10 logarithm

compare objects

copy characters from one object to another

set range of memory to a character

separate integral and fractional parts

raise to a power

force a signal

define signal handling

sine

hyperbolic sine

square root

concatenate strings

compare strings

copy from one string to another

string length

concatenate characters from one string to another

compare characters in strings

copy characters from one string to another

tangent

hyperbolic tangent

disable ADSP-21xx timer

enable ADSP-21xx timer

initialize ADSP-21xx timer

get next argument in variable list

reset variable list pointer

set variable list pointer

Interrupt Handling in C

The C environment supports hardware interrupts—a key feature

that facilitates programming. The signal handling functions of

the C library, signal, raise, and interrupt, process

ADSP-21xx interrupts such as serial port transmit and receive

interrupts, timer interrupts, and external interrupt request

signals.

The signal and raise functions direct execution to a specific

C interrupt service routine based on the type of interrupt that

occurs. This routing service allows the entire application to

be written in C without assembly language code. The signal

handling routines save and restore registers, and the overhead is

usually minimal compared to overall program execution time.

If you choose to write custom interrupt service routines in

assembly language, you can use the signal and raise

functions to set up service routines in the C environment.

ASSEMBLER

The Assembler reads source files containing ADSP-2100 Family

assembly language and generates a relocatable object file. The

Assembler includes a preprocessor that lets you use C

preprocessor directives such as #define, #include, #if,

#ifdef, and #else in assembly code.

Assembler directives define code modules, data buffers, data

variables, and memory-mapped I/O ports. Either assembler

directives or C preprocessor directives define and invoke

macros.

LINKER

The Linker processes separately assembled object files to create

a single executable program. It assigns memory locations to

code and data in accordance with the architecture file defined

by the System Builder.

The Linker also generates symbols (variable names and program

labels) in the processed files, which the simulator, emulator, and

the CBUG C Source-level debugger use to perform symbolic

debugging.

PROM SPLITTER AND HIP SPLITTER

The PROM Splitter translates an ADSP-21xx executable

program into a file used to program PROM memory devices.

The PROM Splitter’s output file can be generated in Motorola

S Record or Intel Hex Record format. Motorola S2 format is

supported for byte stream output.

The HIP Splitter utility generates ADSP-2111 and ADSP-2171

programs to be downloaded from a host processor through the

DSP’s Host Interface Port (HIP). The HIP Splitter’s output file

can be generated in Motorola S Record or Intel Hex Record

format.

Both the PROM Splitter and the HIP Splitter have a boot

loader option that enables loading of external memory.

–4–

REV. B

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