spi.c

ARM开发板,LPC2103功能部件SPI程序

/****************************************Copyright (c)**************************************************
**                               Guangzou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			main.c
** Last modified Date:  2004-09-16
** Last Version:		1.0
** Descriptions:		The main() function example template
**
**------------------------------------------------------------------------------------------------------
** Created by:			Chenmingji
** Created date:		2004-09-16
** Version:				1.0
** Descriptions:		The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
********************************************************************************************************/
#include "config.h"
#include "UART.h"
/************************************************************************************************
** Function name:
** Descriptions:    SPI主机模式初始化
** input parameters:  
** output parameters:   无
** Returned value:      无
************************************************************************************************/
void SPI_Init(void)
{
     PINSEL0 = PINSEL0 & 0xFFFF00FF | 
                       (0x00 << 14) |
                       (0x01 << 12) |
                       (0x01 << 10) |
                       (0x01 << 8);
     //P0.4-P0.7设置为SPI引脚
     SPI_SPCCR = 0x08;           //时钟分频
     SPI_SPCR = (0x00 << 2) |    //8位传输
              (0x00 << 3) |    //第一个跳变沿采样
              (0x00 << 4) |    //SCK高电平时钟有效
              (0x01 << 5) |    //主模式
              (0x00 << 6) |    //MSB传输时在前(SSP固定为MSB在前)
              (0x00 << 7) ;    //禁止中断
}

/************************************************************************************************
** Function name:
** Descriptions:     SSP从机模式初始化
** input parameters:  
** output parameters:   无
** Returned value:      无
************************************************************************************************/
void SSP_Init(void)
{
     PINSEL0 = PINSEL0 & (~(0x03 << 28)) | (0x02 << 28);   //P0.14为SCK
     PINSEL1 = PINSEL1 & 0xFFFFF54F;   //P0.19-21分别为MISO,MOSI,SSEL
     SSPCR0 = (0x07 << 0) |  //8位传输
              (0x00 << 4) |  //SPI格式  
              (0x00 << 6) |  //SCK高电平有效
              (0x00 << 8);   //位速率为默认值
     SSPCR1 = (0x00 << 0) |   //正常工作方式
              (0x01 << 1) |   //SSP使能
              (0x01 << 2) |   //从机模式
              (0x00 << 3);    //允许从机输出
              
}

/************************************************************************************************
** Function name:
** Descriptions:    SPI主发送程序
** input parameters:  
** output parameters:   无
** Returned value:      无
************************************************************************************************/
void SPI_SendData(uint8 sdata)
{
     IO0CLR = (0x01 << 13);   //P0.13接到SSEL片选SSP
     SPI_SPDR = sdata;
     while((SPI_SPSR & 0x80) == 0);  //等待传输完成
     IO0SET = (0x01 << 13);
}

/************************************************************************************************
** Function name:
** Descriptions:   SSP从接收程序
** input parameters:  
** output parameters:   无
** Returned value:      无
************************************************************************************************/
uint8 SSP_ReceiveData(void)
{
     while((SSPSR & 0x04) == 0);
     return(SSPDR);
}

/************************************************************************************************
** Function name:
** Descriptions:    main初始化,SPI,SSP引脚连接设置,初始化UART,SPI,SSP,SPI发送数据,SSP接收数据,
                    发送给PC显示.
** input parameters:  
** output parameters:   无
** Returned value:      无
************************************************************************************************/

int main (void)
{// add user source code 
     uint8 rdata,sdata = 0x06,j;
     PINSEL0 = PINSEL0 & (~(0x03 << 26));    //P0.13作IO端口输出,作SSEL片选
     IO0DIR = (0x01 << 13);
     IO0SET = (0x01 << 13);    //SSEL给高电平,总线空闲
     
     UARTInit();
     SPI_Init();
     SSP_Init();
     
     while(1)
     {
          SPI_SendData(sdata);  //发送'1'的显示码
          rdata = SSP_ReceiveData();
          for(j = 0;j < 8;j++)
			    PCDispChar (j,rdata);
	 }
     return 0;
}
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/