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請問各位有使用過ccompiler來讀取825416bit計數值得問題嗎
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新會員
 
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請問各位,小弟最近在使用16f877控制兩顆兩輪車馬達,
配合了8254計數器0,1,使用16bit方式,MODE4的讀取編碼器 發現實際上有在計數 但是卻不知為何似乎無法 使用16bit讀出值 8bit卻可.. 是否小弟在撰寫8254寫入16bit時產生錯誤呢? void A8254_Init() { TRISD=0X00; // write 8254 data Chip_Select(0x03);//for set 8254 control register; Delay(); PORTE=WRITE_COMMAND_E;//8254 WRITE ENABLE Delay(); //control register: SC1 SC0 RW1 RW0 8: TO USE MODE 4 PORTD=0X38; // 3:to count 0,use 16bit 8: TO USE MODE 4 Delay(); PORTD=0X78; // 7:to count 1,use 16bit 8: TO USE MODE 4 Delay(); PORTD=0XB8; // B:to count 2,use 16bit 8: TO USE MODE 4 Delay(); PORTE=WRITE_COMMAND_D; // 8254 WRITE DISABLE Chip_Select(0x01);// enable COUNT1 FFFF Delay(); PORTE=WRITE_COMMAND_E; Delay(); PORTD=0XFF; // load low 8 bit Delay(); PORTD=0XFF; // load high 8 bit Delay(); PORTE=WRITE_COMMAND_D; Chip_Select(0x02);// enable COUNT2 FFFF Delay(); PORTE=WRITE_COMMAND_E; Delay(); PORTD=0XFF; // load low 8 bit Delay(); PORTD=0XFF; // load high 8 bit Delay(); PORTE=WRITE_COMMAND_D; Chip_Select(0x00);// enable COUNT0 FFFF Delay(); PORTE=WRITE_COMMAND_E; Delay(); PORTD=0XFF; // load low 8 bit Delay(); PORTD=0XFF; // load high 8 bit Delay(); PORTE=WRITE_COMMAND_D; Chip_Select(0x07); }
發表於: 2005/2/3 12:33
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