Texas Instruments TMS34010 User Manual (English)

To Next Page

To Previous Page

TMS34010

Run-Time

Environment

An interrupt function may perform any task a normal function may perform:

access global variables,

allocate local variables,

call

other functions, etc.

Notes:

is your responsibility

handle any special masking

interrupts.

You

can

reenable the interrupts and

any masking required

without

corrupting the C environment.

An interrupt handler must

declared

with

no arguments.

de-

clared to have arguments, the interrupt handler

will

not

run correctly.

An interrupt handler may

not

be called by the user code. Because the

linkage

set up for handling interrupts, a C calling sequence

will

not

handled correctly, and the system could crash.

c-intOO

used

the system reset interrupt. This routine initializes the

system and calls the user's

main function. Note that when the user's

function

called, the interrupts

are

still disabled; thus,

the user's

responsibility

enable interrupts

they are.needed.

Any

interrupt handler can

used to handle any interrupt or multiple

interrupts. The codegen does

not

generate any code specific

the

particular interrupt,

with

the exception

the system reset interrupt

c-intOO,

which

must

used

system reset and cannot have any

local variables (since

assumed that at system reset the stack

has

not

yet been allocated).

To attach

interrupt handler to

interrupt, the address

the in-

terrupt must be placed in the proper interrupt vector. This

can

be done

with

the assembler and linker, creating a simple table

addresses and

linking

the proper location.

5.7

System

Initialization

5-12

Before any C code may

run, the C run-time environment must be created.

This environment is represented in the program stack and the system stack,

so these must be properly constructed and initialized.

addition, any vari-

ables

which

were declared to be automatically initialized at program entry

must

initialized before calling user code.

Two

stacks

are

used

manage the C run-time environment:

Program stack

(STK)

System

stack (SP)

These stacks must

initialized by the

boot

function before any user code is

executed. The stacks

are

located in the static array

SYS-STACK,

declared in

the module

BOOT.C, and share the space by

growing

toward each other from

opposite ends

the space .. A stack overflow occurs when the stacks overlap.

The size

SYS-STACK

may be changed by modifying source code and re-

compiling

BOOT.C. There

no protection in the run-time code against stack

overflows, so stack size should be chosen

with

care.

Other manuals for Texas Instruments TMS34010

Reference Guide181 pages

Need help?

Do you have a question about the Texas Instruments TMS34010 and is the answer not in the manual?

Texas Instruments TMS34010 Specifications

General

Manufacturer	Texas Instruments
Model	TMS34010
Data Bus Width	32-bit
Operating Voltage	5 V
Year Introduced	1986
Category	Graphics Processor Unit (GPU)
Clock Speed	40 MHz (Maximum)
Instruction Set	Custom
Graphics Capabilities	2D graphics
Package	PGA
Resolution Support	up to 1024x768
Architecture	32-bit RISC