Echelon Neuron C Manual de usuario descargar pdf (Pagina 107)

Neuron C Reference Guide 87

go_unconfigured( ) Function

The go_unconfigured( ) function puts the device into an unconfigured state. It

also overwrites all the domain information, which clears authentication keys as

well.

The go_unconfigured( ) function can be used after detecting and logging a serious,

unrecoverable error. Some security devices also call this function when they

detect a attempt to tamper with the device, and thus render the device

inoperational and erase the secret authentication keys.

Syntax

#include <control.h>

void go_unconfigured (void);

Example

void f() {

...

if (unrecoverable) {

error_log(MY_UNRECOVERABLE_ERROR);

go_unconfigured();

}

high_byte( ) Built-in Function

The high_byte( ) built-in function extracts the upper single-byte value from the

double-byte operand. This function operates without regard to signedness. See

also low_byte( ), make_long( ), and swap_bytes( ).

Syntax

unsigned short high_byte (unsigned long

);

Example

short b;

long a;

void f(void)

{

a = 258; // Hex value 0x0102

b = high_byte(a); // b now contains the value 0x01

}

interrupt_control( ) Built-in Function

The interrupt_control( ) built-in function enables or disables interrupts. You can

call the interrupt_control( ) function at any time to enable or disable one or more

of the three interrupt types: I/O interrupts, timer/counter interrupts, or periodic

system timer interrupts. This function applies only to the hardware interrupts

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Echelon Neuron C Manual de usuario Pagina 107