（基础外围设备）SPI

作者: 昨天剩下的一杯冷茶 | 来源:发表于2018-08-31 19:16 被阅读14次

（基础外围设备）SPI
（基础外围设备）软件SPI
9.28
2018.1.15
1.0 dubbo源码解析之@SPI
SPI分类
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#include "spi.h"



/* 
** CPOL     0
** CPHA     0
*/
void SPI_Init(void)
{
  // SPI Master Mode
  PERCFG |= 0x02;        // map USART1 to its alternative 2 location. P1_4: SSN, P1_5: SCK, P1_6: MOSI, P1_7: MISO
  P1SEL |= 0xE0;        // P1_5, P1_6, and P1_7 are peripherals
  P1SEL &= ~0x10;        // P1_4 is GPIO (SSN)
  P1DIR |= 0x10;        // SSN is set as output

  U1BAUD = 0x00; U1GCR |= 0x11;        // Set baud rate to max (system clock frequency / 8)
  U1CSR &= ~0xA0;        // SPI Master Mode
  //        U1CSR &= ~0x80; U1CSR |= 0x20;        // SPI Slave Mode
  
  U1GCR |= (1 << 6);                    // CPHA
  U1GCR |= (1 << 7);                    // CPOL
  U1GCR &= ~0xC0; U1GCR |= 0x20;        // MSB
}


unsigned char Spi0WrByte(unsigned char indata)
{
    unsigned char out;

    U1CSR &= 0xF9;
    U1DBUF = indata; 
    while (!(U1CSR&0x02)); 

    
    //while (!(U1CSR&0x04)); 
    out = U1DBUF;
    
    return out;
}

void DisableSpi0(void)
{

}

//头文件=========================================
#ifndef __SPI_H_
#define __SPI_H_

#include "all.h"

#define ACC_CS_LOW_N()  P1_4=0
#define ACC_CS_HIGH_N()   P1_4=1

void SPI_Init(void);
unsigned char Spi0WrByte(unsigned char indata);
void DisableSpi0(void);

#endif

//例子================================================

#include "all.h" 
#include "uart.h"
#include "delay.h"
#include "lis3dh_driver.h"


typedef unsigned char uint8;
typedef unsigned short int  uint16;


char buf[40];
AxesRaw_t axes[32];
GRaw_t gdata[32];
short xt,yt,zt;
char p_buf[]="hello world\r\n\r\n";
unsigned char get_data_item;

unsigned char i;

void main(void)
{   


  CLKCONCMD &= ~0x40;               //设置系统时钟源为32MHZ晶振
  while(CLKCONSTA & 0x40);          //等待晶振稳定
  CLKCONCMD &= ~0x47;               //设置系统主时钟频率为32MHZ   

  Uart_Init(UART_BAUDRATE_115200);
  Uart_String(p_buf);
  AccSensorConfig();
  SetAccPowerOff(false);            
  while(1)
  {
     
    get_data_item=GetData(axes,gdata);
    for(i = 0; i < get_data_item; i++)
    {
      xt=((short)axes[i].AXIS_X)>>4;
      yt=((short)axes[i].AXIS_Y)>>4;
      zt=((short)axes[i].AXIS_Z)>>4;
      sprintf(buf,"%d-%d-%d\r\n",xt,yt,zt);
      Uart_String(buf);
    }

     delay_ms(400);
    
  }

      
}

我需要硬件来验证我的SPI驱动是否写对了，我选择Li3dh模块，在转动LI3DH时，三个轴的数据不同。

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