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在结合硬件的编程中,有些变量需要特定地址.<br /><br />一般可以采用指针变量.<br />例如:<br />unsigned int *LedReg = (unsigned int *)0x5f00;//发光二极管地址<br />*LedReg = 0xFF;<br /><br />但有些时候感觉不是太好时,可以像Keil那样<br /><br />unsigned int LedReg at 0x5f00;//发光二极管地址<br />LedReg = 0xFF;<br /><br />这样看着"比较顺眼"~~~<br />但在TIDSP的CCS环境下,不能采用at或__at等来定位地址.<br />不过CCS也提供了类似的手段,不过有些"麻烦".<br /><br />具体实现:<br /><br />1.在CMD文件中<br /><br />MEMORY<br />{<br /> PAGE 0: /* Program Memory */<br /><br /> PAGE 1: /* Data Memory */<br /> <br /> LED_REG : origin = 0x005f00, length = 0x00001 /*发光二极管地址*/<br /> LCD_ComL : origin = 0x005100, length = 0x00001 <br /> LCD_ComH : origin = 0x005200, length = 0x00001<br /> LCD_DatL : origin = 0x005300, length = 0x00001<br /> LCD_DatH : origin = 0x005400, length = 0x00001<br /> EINT_REG : origin = 0x005c00, length = 0x00001<br /> KEY_REG : origin = 0x005b00, length = 0x00001<br /> RCLK_REG : origin = 0x005500, length = 0x00001 /*数码管锁存地址*/<br />}<br /><br /> <br />SECTIONS<br />{<br /> LedDataRegsFile : > LED_REG, PAGE = 1<br /> LcdComlRegsFile : > LCD_ComL, PAGE = 1<br /> LcdComhRegsFile : > LCD_ComH, PAGE = 1<br /> LcdDatlRegsFile : > LCD_DatL, PAGE = 1<br /> LcdDathRegsFile : > LCD_DatH, PAGE = 1<br /> KeyRegsFile : > KEY_REG, PAGE = 1<br /> EintRegsFile : > EINT_REG, PAGE = 1<br /> RclkRegsFile : > RCLK_REG, PAGE = 1<br />}<br /><br />2.在C/C++文件中<br /><br /><br />#ifdef __cplusplus <br />#pragma DATA_SECTION("LedDataRegsFile") /*C++语言格式*/<br />#else <br />#pragma DATA_SECTION(LedRegs,"LedDataRegsFile");/*C语言格式*/<br />#endif<br />volatile unsigned int LedRegs;<br /><br />/*以下为C++语言格式*/<br /><br />#pragma DATA_SECTION("LcdComlRegsFile") <br />volatile unsigned int LcdComL;<br />#pragma DATA_SECTION("LcdComhRegsFile") <br />volatile unsigned int LcdComH;<br />#pragma DATA_SECTION("LcdDatlRegsFile") <br />volatile unsigned int LcdDatL;<br />#pragma DATA_SECTION("LcdDathRegsFile") <br />volatile unsigned int LcdDatH;<br /><br />#pragma DATA_SECTION("EintRegsFile") <br />volatile unsigned int EintRegs;<br /><br />#pragma DATA_SECTION("KeyRegsFile") <br />volatile unsigned char KeyRegs;<br /><br />#pragma DATA_SECTION("RclkRegsFile") <br />volatile bool SpiRclkRegs;<br /><br /><br />3.在应用程序中<br /><br />extern unsigned int LedRegs;<br />extern volatile unsigned int EintRegs;<br />extern volatile unsigned char KeyRegs;<br />extern volatile bool SpiRclkRegs;<br />//............<br />LedRegs = 0xff;//这样就不需要指针变量的写法了<br />//..................<br /><br />//HotPower@126.com 2008.4.17 1:34<br /> |
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