嵌入式io端口ppt課件(編輯修改稿)
2025-02-01 10:08 本頁面
【文章內(nèi)容簡介】 (*(volatile unsigned *)0x56000050) //Port F control ? define rGPFDAT (*(volatile unsigned *)0x56000054) //Port F data ? define rGPFUP (*(volatile unsigned *)0x56000058) //Pullup control F ? define rGPGCON (*(volatile unsigned *)0x56000060) //Port G control ? define rGPGDAT (*(volatile unsigned *)0x56000064) //Port G data ? define rGPGUP (*(volatile unsigned *)0x56000068) //Pullup control G ? define rGPHCON (*(volatile unsigned *)0x56000070) //Port H control ? define rGPHDAT (*(volatile unsigned *)0x56000074) //Port H data ? define rGPHUP (*(volatile unsigned *)0x56000078) //Pullup control H ? define rGPJCON (*(volatile unsigned *)0x560000d0) //Port J control ? define rGPJDAT (*(volatile unsigned *)0x560000d4) //Port J data ? define rGPJUP (*(volatile unsigned *)0x560000d8) //Pullup control define rGPFCON (*(volatile unsigned *)0x56000050)//Port F control define rGPFDAT (*(volatile unsigned *)0x56000054) //Port F data define rGPFUP (*(volatile unsigned *)0x56000058) //Pullup control F 21 ***關(guān)于 volatile的說明 *** ? volatile的本意是“易變的” ；由于訪問寄存器的速度要快過 RAM,所以編譯器一般都會作減少存取外部 RAM的優(yōu)化。比如： static int i=0。 int main(void) { ... while (1) { if (i) dosomething()。 } } /* Interrupt service routine. */ void ISR_2(void) { i=1。 } 22 ***關(guān)于 volatile的說明 *** ? 程序的本意是希望 ISR_2中斷產(chǎn)生時(shí) ,在 main當(dāng)中調(diào)用 dosomething
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