- #include <reg51.h>
- #include <intrins.h>
- #define NOP() _nop_() /* 定义空指令 */
-
- //SPI IO
- sbit MOSIO =P3^4;
- sbit R_CLK =P3^5;
- sbit S_CLK =P3^6;
-
-
-
- void delay(unsigned int i); //函数声名
- void HC595SendData(unsigned char SendVal);
-
- // 此表为 LED 的字模 // 0 1 2 3 4 5 6 7 8 9 A b c d E - L P U Hidden _ (20)
- unsigned char code Disp_Tab[] = { 0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0xbf,0xc7,0x8c,0xc1, 0xff, 0xf7 };
- unsigned char code LED7Code[] = {~0x3F,~0x06,~0x5B,~0x4F,~0x66,~0x6D,~0x7D,~0x07,~0x7F,~0x6F,~0x77,~0x7C,~0x39,~0x5E,~0x79,~0x71};
-
-
- main()
- { unsigned char HC595SendVal;
- unsigned int LedNumVal=1;
-
- while(1)
- {
- LedNumVal++;
- HC595SendVal = LED7Code[LedNumVal%16]; //LED7; 显示0-F LedNumVal%10 显示0-9
- HC595SendData(HC595SendVal);
-
- delay(200);
-
- }
- }
-
- void delay(unsigned int i)
- {
- unsigned int j;
- for(i; i > 0; i--)
- for(j = 300; j > 0; j--);
- }
-
-
- /*********************************************************************************************************
- ** 函数名称: HC595SendData
- ** 功能描述: 向SPI总线发送数据
- *********************************************************************************************************/
- void HC595SendData(unsigned char SendVal)
- {
- unsigned char i;
-
- for(i=0;i<8;i++)
- {
- if((SendVal<<i)&0x80) MOSIO=1; //set dataline high 0X80 最高位与SendVal左移的最高位 进行逻辑运算
- else MOSIO=0; // 如果为真 MOSIO = 1
-
- S_CLK=0;
- NOP();
- NOP();
- S_CLK=1;
- }
-
-
- R_CLK=0; //set dataline low
- NOP();
- NOP();
- R_CLK=1; //片选
-
- }
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