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Re: 如何在PIC30f5015上使用c language的scanf
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版主
 
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實在看不懂你的程式，不過 Enter Key 的 ASCII Code 是 0x0D，我在你的程式並沒有看對 Enter Key 的檢查。
發表於: 2008/10/13 8:44
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如何在PIC30f5015上使用c language的scanf
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新會員
 
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各位好,
本人最近想使用scanf來讀取來自uart的輸入字元,從microchip文件讀到必須修改read.c 的檔案. 我把它放入MPLAB IDE project 裏,因為5015只有 一個UART, 我就修改成如下所示,我就在程式裡使用scanf來讀取我從PC上的hyper terminal輸入的字元,可是當我只按了一個字元scanf就執行完畢,理論上應該是我按下幾個字元再按 Enter後scanf才算執行完畢,一直百思不解,不知各位先進有何解答, 本人不甚感激 #include <p30f5015.h> #include <stdio.h> int __attribute__((__weak__, __section__(".libc"))) read(int handle, void *buffer, unsigned int len) { int i; volatile UxMODEBITS *umode = &U1MODEbits; volatile UxSTABITS *ustatus = &U1STAbits; volatile unsigned int *rxreg = &U1RXREG; volatile unsigned int *brg = &U1BRG; if (_Files[0]->_Lockno == 0) { for (i = len; i; --i) { while ((ustatus->URXDA) == 0); *(char*)buffer++ = *rxreg; } len -= i; } return(len); }
發表於: 2008/10/10 22:07
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