参数资料
型号: SW006015
厂商: Microchip Technology
文件页数: 69/120页
文件大小: 0K
描述: C COMPILER MPLAB C32
标准包装: 1
类型: 编译器
适用于相关产品: PIC32
产品目录页面: 659 (CN2011-ZH PDF)
Compiler Runtime Environment
FIGURE 5-7:
INITIALIZED DATA
5.7.2.7
COPY RAM FUNCTIONS FROM PROGRAM FLASH TO DATA MEMORY
RAM functions are similar to initialized data, except that the data that exists in the
program flash represents functions instead of initial values for symbols. Similar to the
way that initialized data is copied from program flash to data memory, the linker script
must initialize three variables—one for the start address of the image in program flash,
one for the start address of the section in data memory and one for the end address of
the section in data memory. The startup code copies the memory locations from the
program flash image to the data memory using these variables. These variables are
named _ramfunc_image_begin , _ramfunc_begin , and _ramfunc_end ,
respectively.
FIGURE 5-8:
RAM FUNCTIONS
5.7.2.8
INITIALIZE BUS MATRIX REGISTERS
The bus matrix registers ( BMXDKPBA , BMXDUDBA , BMXDUPBA ) should be initialized by
the startup code if any RAM functions exist, otherwise, these registers should not be
modified. To determine whether any RAM functions exist in the application, the linker
script provides a variable that contains the length of the .ramfunc section 1 . This
1. All functions attributed with __ramfunc__ or __longramfunc__ are placed in the .ramfunc section.
? 2007 Microchip Technology Inc.
DS51686A-page 65
相关PDF资料
PDF描述
SW300003-EVAL LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL SOFTWARE LIBR ENC/DEC EVAL ONLY
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