关于DSP281X变量地址定位问题

2万 · 2008-4-17 01:37

在结合硬件的编程中,有些变量需要特定地址.

一般可以采用指针变量.
例如:
unsigned int *LedReg   = (unsigned int *)0x5f00;//发光二极管地址
*LedReg = 0xFF;

但有些时候感觉不是太好时,可以像Keil那样

unsigned int LedReg at 0x5f00;//发光二极管地址
LedReg = 0xFF;

这样看着"比较顺眼"~~~
但在TIDSP的CCS环境下,不能采用at或__at等来定位地址.
不过CCS也提供了类似的手段,不过有些"麻烦".

具体实现:

1.在CMD文件中

MEMORY
{
PAGE 0:    /* Program Memory */

PAGE 1:    /* Data Memory */

   LED_REG     : origin = 0x005f00, length = 0x00001 /*发光二极管地址*/
   LCD_ComL    : origin = 0x005100, length = 0x00001
   LCD_ComH    : origin = 0x005200, length = 0x00001
   LCD_DatL    : origin = 0x005300, length = 0x00001
   LCD_DatH    : origin = 0x005400, length = 0x00001
   EINT_REG    : origin = 0x005c00, length = 0x00001
   KEY_REG     : origin = 0x005b00, length = 0x00001
   RCLK_REG    : origin = 0x005500, length = 0x00001 /*数码管锁存地址*/
}

SECTIONS
{
   LedDataRegsFile   : > LED_REG,     PAGE = 1
   LcdComlRegsFile   : > LCD_ComL,    PAGE = 1
   LcdComhRegsFile   : > LCD_ComH,    PAGE = 1
   LcdDatlRegsFile   : > LCD_DatL,    PAGE = 1
   LcdDathRegsFile   : > LCD_DatH,    PAGE = 1
   KeyRegsFile       : > KEY_REG,     PAGE = 1
   EintRegsFile      : > EINT_REG,    PAGE = 1
   RclkRegsFile      : > RCLK_REG,    PAGE = 1
}

2.在C/C++文件中

#ifdef __cplusplus
#pragma DATA_SECTION("LedDataRegsFile") /*C++语言格式*/
#else
#pragma DATA_SECTION(LedRegs,"LedDataRegsFile");/*C语言格式*/
#endif
volatile unsigned int LedRegs;

/*以下为C++语言格式*/

#pragma DATA_SECTION("LcdComlRegsFile")
volatile unsigned int LcdComL;
#pragma DATA_SECTION("LcdComhRegsFile")
volatile unsigned int LcdComH;
#pragma DATA_SECTION("LcdDatlRegsFile")
volatile unsigned int LcdDatL;
#pragma DATA_SECTION("LcdDathRegsFile")
volatile unsigned int LcdDatH;

#pragma DATA_SECTION("EintRegsFile")
volatile unsigned int EintRegs;

#pragma DATA_SECTION("KeyRegsFile")
volatile unsigned char KeyRegs;

#pragma DATA_SECTION("RclkRegsFile")
volatile bool SpiRclkRegs;

3.在应用程序中

extern unsigned int LedRegs;
extern volatile unsigned int EintRegs;
extern volatile unsigned char KeyRegs;
extern volatile bool SpiRclkRegs;
//............
LedRegs = 0xff;//这样就不需要指针变量的写法了
//..................

//HotPower@126.com 2008.4.17 1:34