AN3350 datasheet(181/185 Pages) STMICROELECTRONICS

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AN3350

eTPU specific features

Doc ID 018512 Rev 2

181/185

23.11

Fractional types

fract8, fract16, and fract24 types represent fractional numbers of the specified size in bits.

Unsigned and signed modifiers can be applied to them. Unsigned fract can represent

numbers between 0 and 1. Signed fract can represent numbers between -1 and 1.

23.12

Inline assembly

The inline assembly statement syntax is:

asm{"<assembly instructions>"};

Both multi line and single line assembly instructions may be omitted using this statement.

The <assembly instruction> would be according to the new assembly language which shall

be defined by DevTech.

23.12.1

Inline assembler usage

Use the inline assembler in order to write assembler code that is eTPU specific and cannot

be expressed using the C language:

asm{" add.f p, p, diob"};

23.12.2

Specifying variables and labels

You may also use local variable names and labels inside inline assembly statements to

reference variables of a C function or targets for change of flow directly.

In the example below, a local variable name needs a @Rn suffix to be recognized. Do not

replace @Rn with an actual register number. It has to be the verbatim text made of the

letters @, R, and n:

asm{" add x@Rn,p,diob"}; // x is a local variable

asm{" jmp label_name"};

asm{" ld p, glob_var"}; // glob_var is a global variable

asm{" ldm p, chan_var"}; // chan_var is a variable allocated on the

channel parameter ram

Finally, you can also declare labels using the inline assembler to, for example, mark the

beginning for a special assembly loop or branch target:

asm{__mysmstart: jmp __mysmstart};

23.12.3

Using datatype sizes

You might want to reference the size of a structure from the inline assembler:

asm {addi x@Rn, x@Rn, myStruct@sizeof};

23.13

#pragma write

#pragma write char, (text);

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