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PIC与MCP41010通讯问题
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新會員
 
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void spiinit()
{ PIR1 = 0; SSPCON = 0x20; //工作在主控下，无效为低电平 00100000 SSPSTAT = 0x00; //00000000 TRISC3 = 0; TRISC4 = 1; //sdo输出，sck输出，SDI输入,rc6.rc7输出 TRISC5 = 0; TRISC6 = 0; TRISC7 = 0 ; TRISA5 = 0; } 这里要往mcp41010数字电位器写数,mcp41010支持0.0 和1.1俩个模式,下面是数据发送函数之前cs已经拉低,在下面俩个函数后拉高,这里出现了一个奇怪问题,SSPBUF = 0x11,这里的赋值不起作用,在watch中观察始终为0x00,软件调试就没有这个问题.不知道那位老师能解答一下为什么? void spisetcom() { SSPBUF = 0x11; //mcp41010命令 do { ; } while(SSPIF==0); //等待发送完毕 SSPIF=0; } void spisetdata() { SSPBUF = data; data++; do { ; } while(SSPIF==0); //等待发送完毕 SSPIF=0; } 示波器上sdo引脚与cs引脚有输出
發表於: 2008/7/30 15:53
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