请教： #pragma segment="FLASHCODE" 和 #pragma vector = PORT1_VECT
//******************************************************************************//MSP430x54x Demo - Block Write and Memory Erase @ 0x10000 Executed from RAM
//
//Description: This program first copies write_block_int function to RAM.
//Copying to RAM requires a custom made .xcl command linker file. This file is
//attached as part of the project called custom_lnk_msp430f5438.xcl. This
//program then erases Flash address 0x10000 - 0x1FFFF which is executed from
//RAM. Then, it writes to Bank 1 from 0x10000 to 0x1003F. This write shows the
//advantage of block writing in which 2 consecutive word can be written.
//
//Important Notes:
//
//1. Copy a new linker file (custom_lnk_msp430f5438.xcl) before modifying it.
// See the zip file for the modified linker file. 1 line was added and 2
// line was changed. Goto Project Options --> Linker --> Config. Overide the
// linker command file and insert the new .xcl file.
//
// -QRAMCODE=FLASHCODE // Needed to tell compiler that user
// will copy flash code to ram code
// -Z(DATA)RAMCODE,DATA16_I,DATA16_Z,DATA16_N,DATA16_HEAP+_DATA16_HEAP_SIZE=1C00-5BFF
// // Add RAMCODE into Flash segment
// -P(CODE)FLASHCODE,CODE=5C00-FF7F,10000-45BFF
// // Add FLASHCODE into Flash segment
//
//2. Define the allocated memory area that will be copied from FLASH to RAM.
// In this case, user has to manually define the start address of FLASH and
// RAM. These memory addresses has to be the same as defined in the linker
// file origin address of FLASH_MEM and RAM_MEM. The FLASH_MEM_LENGTH can be
// changed to however much the final compiled code size is.
//
// WRITE_LENGTH EQU 64
// FLASH_MEM_BEGIN EQU 0x5C00 ; Flash code starting address
// FLASH_MEM_LENGTHEQU 0x0200 ; Function segment size to be copied
// RAM_MEM_BEGIN EQU 0x1C00 ; RAM code starting address
// WRITE_ADDR EQU 0x10000 ; Flash write address
//
//RESET the device to re-execute code. This is implemented to prevent
//stressing of Flash unintentionally.
//ACLK = REFO = 32kHz, MCLK = SMCLK = default DCO 1048576Hz
//
// MSP430x54x
// -----------------
// /|\| XIN|-
// | | |
// --|RST XOUT|-
// | |
//
// W. Goh
// Texas Instruments Inc.
// April 2009
// Built with IAR Embedded Workbench Version: 4.11B
//******************************************************************************
#include "msp430x54x.h"
#include "string.h"
#pragma segment="FLASHCODE" // Define flash segment code
#pragma segment="RAMCODE" /////？？？？？？？？？？？？？？？？？？？？？？？？？？问题在这里？这两句的意思是什么？
// Function prototypes
void copy_flash_to_RAM(void);
void write_block_int(void);
unsigned long value;
void main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Stop WDT
copy_flash_to_RAM(); // Copy flash to RAM function
value = 0x12340000; // initialize Value
write_block_int(); // This portion of code is executed
// in RAM
while(1); // Loop forever, SET BREAKPOINT HERE
}
//------------------------------------------------------------------------------
// Copy flash function to RAM.
//------------------------------------------------------------------------------
void copy_flash_to_RAM(void)
{
unsigned char *flash_start_ptr; // Initialize pointers
unsigned char *flash_end_ptr;
unsigned char *RAM_start_ptr;
//Initialize flash and ram start and end address
flash_start_ptr = (unsigned char *)__segment_begin("FLASHCODE");
flash_end_ptr = (unsigned char *)__segment_end("FLASHCODE");
RAM_start_ptr = (unsigned char *)__segment_begin("RAMCODE");
//calculate function size
unsigned long function_size = (unsigned long)(flash_end_ptr) - (unsigned long)(flash_start_ptr);
// Copy flash function to RAM
memcpy(RAM_start_ptr,flash_start_ptr,function_size);
}
#pragma location="RAMCODE"
//------------------------------------------------------------------------------
// This portion of the code is first stored in Flash and copied to RAM then
// finally executes from RAM.
//-------------------------------------------------------------------------------
void write_block_int(void)
{
unsigned int i;
unsigned long * Flash_ptr;
Flash_ptr = (unsigned long *)0x10000; // Initialize write address
__disable_interrupt(); // 5xx Workaround: Disable global
// interrupt while erasing. Re-Enable
// GIE if needed
// Erase Flash
while(BUSY & FCTL3); // Check if Flash being used
FCTL3 = FWKEY; // Clear Lock bit
FCTL1 = FWKEY+ERASE; // Set Erase bit
*Flash_ptr = 0; // Dummy write to erase Flash seg
while(BUSY & FCTL3); // Check if Erase is done
// Write Flash
FCTL1 = FWKEY+BLKWRT+WRT; // Enable block write
for(i = 0; i < 64; i++)
{
*Flash_ptr++ = value++; // Write long int to Flash
while(!(WAIT & FCTL3)); // Test wait until ready for next byte
}
FCTL1 = FWKEY; // Clear WRT, BLKWRT
while(BUSY & FCTL3); // Check for write completion
FCTL3 = FWKEY+LOCK; // Set LOCK
} IAR帮助文档里有，你找找看。 回复【1楼】ljmdzyx
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文档 确实 是有。
不过 看的实在是累人。
兄弟 要是懂的话， 就交流指导一下吧。。 http://cache.amobbs.com/bbs_upload782111/files_46/ourdev_684887MOW21T.png
(原文件名:11111.png)
在文档 里面有该语句的解释， 不过貌视 我还是看不太懂！！！
哪位知道的能分享 一些经验吗？
还有 那个 例子是什么意思呢？ 唉，msp低功耗的方式太多了，很多都很难搞明白的 #pragma vector=数值 表示一个中断向量
紧接着就是中断函数，为了区分，中断函数前面加__interrupt关键字 JJ，在函数前加#pragma segment="RAMCODE"就是存储在ram里
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