spi.c

Lpc2103的小程序

/****************************************Copyright (c)**************************************************
**
**                                   北天星国际有限公司
**                                 http://www.po-star.com
**
**------------------------------------------------------------------------------------------------------

名称：SPI.C
功能：模拟SPI总线实现数码管显示
说明：跳线JP7跳到数码管这边
**********************************************************************************************************/
#include  "..\inc\config.h"


/* 数据码显示控制对应表，如下:
                a
             -------
           |	     |
          f|	     |b
           |    g    |				
             -------
           |	     |
          e|	     |c
           |    d    |				
             -------  。h

Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0   DAT   HEX		OUT
h  f  g  e  d  c  b  a
0  0  1  1  1  1  1  1     0    3f		C0
0  0  0  0  0  1  1  0     1    06		F9
0  1  0  1  1  0  1  1     2    5b		A4
0  1  0  0  1  1  1  1     3    4f              B0	
0  1  1  0  0  1  1  0     4    66		99	
0  1  1  0  1  1  0  1     5    6d		92	
0  1  1  1  1  1  0  1     6    7d		82	
0  0  0  0  0  1  1  1     7    07		F8
0  1  1  1  1  1  1  1     8    7f		80
0  1  1  0  1  1  1  1     9    6f		90
0  1  1  1  0  1  1  1     A    77		88
0  1  1  1  1  1  0  0     B    7c		83
0  0  1  1  1  0  0  1     C    39		C6
0  1  0  1  1  1  1  0     D    5e		A1
0  1  1  1  1  0  0  1     E    79		86
0  1  1  1  0  0  0  1     F    71		8E

－－注：请根据硬件的原理修改对应关系（Q0~Q7与a~h的关系)及输出值（OUT)*/

const U8  SEGMENT_DATA[16] = { 0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,
                                0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E };


/***************************** 延时子程序*******************/

void Delay(int ms)
{
   U16 k;
   while(ms--)
   {
     for(k=0; k<1000; k++);
   }
}

/*********************************初始化*********************************/

void SPI_Init()
{
  IO0DIR=SCLK|MOSI|RCK|LED_MASK;
  IO0CLR=SCLK|RCK;
}
/***************************向SPI总线上写一个字节的数据**************************/

void WriteByte(U8 data)
{
  U8 i;
  for(i=0;i<8;i++)
  {
    if(data&0x80)      IO0SET=MOSI;
    else      IO0CLR=MOSI;
    IO0SET=SCLK;
    data<<=1;
    IO0CLR=SCLK;
  }
}
void PLL_Init()
{
  PLLCON = 1;
	#if ((Fcclk / 4) / Fpclk) == 1
		VPBDIV = 0;
	#endif
	#if ((Fcclk / 4) / Fpclk) == 2
		VPBDIV = 2;
	#endif
	#if ((Fcclk / 4) / Fpclk) == 4
		VPBDIV = 1;
	#endif
	#if (Fcco / Fcclk) == 2
		PLLCFG = ((Fcclk / Fosc) - 1) | (0 << 5);
	#endif
	#if (Fcco / Fcclk) == 4
		PLLCFG = ((Fcclk / Fosc) - 1) | (1 << 5);
	#endif
	#if (Fcco / Fcclk) == 8
		PLLCFG = ((Fcclk / Fosc) - 1) | (2 << 5);
	#endif
	#if (Fcco / Fcclk) == 16
		PLLCFG = ((Fcclk / Fosc) - 1) | (3 << 5);
	#endif
		PLLFEED = 0xaa;
		PLLFEED = 0x55;
		while((PLLSTAT & (1 << 10)) == 0);
		PLLCON = 3;
		PLLFEED = 0xaa;
		PLLFEED = 0x55;
}

/******************主函数***************************************************/
void main( )
{
   U8 i;
   PINSEL0 = 0x00000000;                 // 设置I/O连接到UART0
   PINSEL1 = 0x00000000;
   IO0DIR =MOSI|RCK|SCLK;
   PLL_Init();
   IO0CLR=SCLK;
   IO0SET=RCK;
   SPI_Init();
   while(1)
  {
    for(i=0;i<100;i++)
    {
      WriteByte(SEGMENT_DATA[i/10]);
      WriteByte(SEGMENT_DATA[i%10]);
      IO0SET=RCK;
      IO0CLR=RCK;                          //发送两个字节以后发送一个RCK信号，实现一次传送16位数据，点亮两个数码管
      Delay(1000);
}}

}