Embedded FreeBSD Cookbook phần 7 pps

136 Embedded FreeBSD

Cookbook

}

else

{

printf(“illegal state\n”);

return;

}

if (dio_set_int(s) != 0)

{

printf(“set int failed\n”);

}

}

Listing 7-7

The int_handler function parses the user input looking for either the

enable or disable string to determine the interrupt setting. If the user input

is correct, dio_set_int is called to set the interrupt state.

The pciint_handler Function

The pciint_handler function is used to set pci interrupts. The pciint

command is entered using the following syntax,

> pciint value

where value is either the string enable or disable.

void

pciint_handler(char* args, uint8_t* p)

{

char state[32];

DIOintstate_t s;

sscanf(args, “%*s %s”, state);

if ((strcmp(state, “enable”) == 0) || (strcmp(state, “ENABLE”)

== 0))

{

s = enable;

}

else if ((strcmp(state, “disable”) == 0) || (strcmp(state,

“DISABLE”) == 0))

{

s = disable;

137 Chapter Seven

Remote Management

}

else

{

printf(“illegal state\n”);

return;

}

if (dio_set_pciint(s) != 0)

{

printf(“set pciint failed\n”);

}

}

Listing 7-8

The pciint_handler function parses the user input looking for either the

enable or disable string to determine the interrupt setting. If the user input

is correct, dio_set_pciint is called to set the interrupt state.

The setpolarity_handler Function

The setpolarity_handler function is used to set the interrupt polarity.

The set polarity command is entered using the following syntax:

> setpol value

where value is either high or low.

void

setpolarity_handler(char* args, uint8_t* p)

{

char state[32];

DIOpolarity_t polarity;

sscanf(args, “%*s %s”, state);

if ((strcmp(state, “hi”) == 0) || (strcmp(state, “HI”)) == 0)

{

polarity = activehi;

}

else if ((strcmp(state, “lo”) == 0) || (strcmp(state, “LO”))

== 0)

{

polarity = activelo;

}