Configuration Items - Freescale Semiconductor DSP56800E User Manual

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Configuration Items

This section summarizes the symbols used in macro definitions for the static CMP_A and

CMP_B module configuration by the driver initialization routine. Configuration symbols are

intended for the application (project) specific configuration file appconfig.h.

CMP_x_CTRL_INIT

CMP_x_FILT_INIT

Note - The "x" specifies the CMP module. This may be either A or B.

API Specification

This section specifies the exact usage for each API function.

Function arguments for each routine are described as in, out, or inout.

1. in argument means that the parameter value is an input only to the function.

2. out argument means that the parameter value is an output only from the function.

3. inout argument means that a parameter value is an input to the function, but the same

parameter is also an output from the function.

Note: inout parameters are typically input pointer variables in which the caller passes the address

of a pre-allocated data structure to a function. The function stores its results within that data

structure. The actual value of the inout pointer parameter is not changed.

ioctl call(s):

The ioctl call is generally represented by one of the following forms:

UWord16 ioctl(const int *pModuleBase, void cmd, UWord16 param);

UWord16 ioctl(const int *pModuleBase, void cmd, void* pParam);

Description: The ioctl call "changes" the CMP device modes or accesses the CMP register(s).

The third ioctl parameter is either a value or a pointer, depending on the type of cmd.

Table 5-793. CMP Configuration Items for appconfig.h

Table 5-794. CMP Driver Arguments - ioctl

Targeting 56F8xxx Platform

The initial value of the Compar-

ator Control Register

Initial value of the Comparator

Filter Register

CMP module identifier. Use CMP_A or

Commands found in cmp.h which are

used to modify the CMP module status

and control registers. See Table 5-795.

FREESCALE SEMICONDUCTOR

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