lesson11.lst

PIC单片机内部SPI通信接口的使用方法（与93c46EEPROM接口）

     1: #include<pic.h>
     2: #define uchar unsigned char
     3: #define uint  unsigned int
     4: #define cs RC2
     5: #define dout RC4
     6: #define nop() asm("nop")
     7: __CONFIG(0x3B31);
     8: const uchar table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
     9:                         0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
    10: uchar data_temp;
    11: void delay(uint x);
    12: void init();
    13: void didi(uchar num);
    14: void disp(uchar num1,uchar num2,uchar num3,uchar num4,uchar num5,uchar num6);
    15: void comm(uchar data);
    16: uchar read(uchar add);
    17: void write(uchar add,uchar wdata);
    18: void write_enable();
    19: void main()
    20: {
    21:         uchar a1,a2,a3,a4,a5,a6,i;
    22:         init();
    23: //      write_enable();
    24: //      for(i=6;i>0;i--)
    25: //      {
    26:         //      write_enable();
    27: //              write(i,i);
    28: //      }
    29:         a1=read(1);
    30:         a2=read(2);
    31:         a3=read(3);
    32:         a4=read(4);
    33:         a5=read(5);
    34:         a6=read(6);
    35:         while(1)
    36:         {
    37:                 disp(a1,a2,a3,a4,a5,a6);
    38:         }       
    39: }
    40: void delay(uint x)
    41: {
    42:         uint a,b;
    43:         for(a=x;a>0;a--)
    44:                 for(b=110;b>0;b--);
    45: }
    46: void init()
    47: {
    48:         TRISD=0;
    49:         TRISA=0;
    50:         TRISC=0x10;//00010000
    51:         TRISE0=0;
    52:         SSPSTAT=0x80;
    53:         SSPCON=0x32;
    54:         cs=0;
    55: }
    56: 
    57: void write_enable()
    58: {
    59:         cs=1;
    60:         nop();
    61:         comm(0x02);
    62:         comm(0x60);
    63:         cs=0;   nop();  nop();
    64: }
    65: 
    66: void write(uchar add,uchar wdata)
    67: {
    68:         cs=1;
    69:         nop();
    70:         comm(0x02);
    71:         comm(add|0x80);
    72:         comm(wdata);
    73:         cs=0;
    74:         nop();  nop();
    75:         cs=1;   nop();  nop();
    76:         while(!dout);
    77:         cs=0;   nop();  nop();
    78: //      PORTD = 0Xff;
    79: //      PORTA = 0Xff;
    80: }
    81: 
    82: uchar read(uchar add)
    83: {
    84:         uchar rtemp;
    85:         cs=1;
    86:         nop();
    87:         comm(0x03);
    88:         comm(add);
    89:         comm(0);
    90:         cs=0;
    91:         rtemp=data_temp;
    92:         return (rtemp);
    93: }
    94: void comm(uchar data)
    95: {
    96:         SSPBUF=data;
    97:         while(!SSPIF);
    98:         SSPIF=0;
    99:         data_temp=SSPBUF;
   100: }
   101: 
   102: void didi(uchar num)
   103: {
   104:         uchar di_num;
   105:         for(di_num=num;di_num>0;di_num--)
   106:         {
   107:                 RE0=1;
   108:                 delay(50);
   109:                 RE0=0;
   110:                 delay(20);
   111:         }
   112: }
   113: 
   114: void disp(uchar num1,uchar num2,uchar num3,uchar num4,uchar num5,uchar num6)
   115: {
   116:         PORTD=table[num1];//显示第一个数码管
   117:         PORTA=0x20;//0010 0000
   118:         delay(2);
   119:         PORTD=table[num2];//显示第二个数码管
   120:         PORTA=0x10;//0001 0000
   121:         delay(2);
   122:         PORTD=table[num3];//显示第三个数码管
   123:         PORTA=0x08;//0000 1000
   124:         delay(2);
   125:         PORTD=table[num4];//显示第四个数码管
   126:         PORTA=0x04;//0000 0100
   127:         delay(2);
   128:         PORTD=table[num5];//显示第五个数码管
   129:         PORTA=0x02;//0000 0010
   130:         delay(2);
   131:         PORTD=table[num6];//显示第六个数码管
   132:         PORTA=0x01;//0000 0001
   133:         delay(2);
   134: }