2440驱动MMA7455L源程序 - - Powered by Discuz!

/****************************************************************
文件名：Main.c
功能描述：主程序
****************************************************************/
#define GLOBAL_CLK 1
#include <stdlib.h>
#include <string.h>
#include "def.h"
#include "option.h"
#include "2440addr.h"
#include "2440lib.h"
#include "2440slib.h"
#include "Uart.h"
void SPI_Init(void);
void WriteByte_MMA7455L(U8 addr,U8 dat);
U8 ReadByte_MMA7455L(U8 addr);
static U32 cpu_freq;
static U32 UPLL;
static void cal_cpu_bus_clk(void)
{
U32 val;
U8 m, p, s;
val = rMPLLCON; 　　//MPLLCON上电初始值为0x00096030
m = (val>>12)&0xff; //结果为0x96=150
p = (val>>4)&0x3f; //结果为0x03=3
s = val&3; 　　//结果为0
//(m+8)*FIN*2 不要超出32位数!
FCLK = ((m+8)*(FIN/100)*2)/((p+2)*(1<<s))*100;//"1<<s"表示令1左移s位，即可得2^s
val = rCLKDIVN;
m = (val>>1)&3;
p = val&1;
val = rCAMDIVN;
s = val>>8;
switch (m) {
case 0:
HCLK = FCLK;
break;
case 1:
HCLK = FCLK>>1;
break;
case 2:
if(s&2)
HCLK = FCLK>>3;
else
HCLK = FCLK>>2;
break;
case 3:
if(s&1)
HCLK = FCLK/6;
else
HCLK = FCLK/3;
break;
}
if(p)
PCLK = HCLK>>1;
else
PCLK = HCLK;
if(s&0x10)
cpu_freq = HCLK;
else
cpu_freq = FCLK;
val = rUPLLCON;
m = (val>>12)&0xff;
p = (val>>4)&0x3f;
s = val&3;
UPLL = ((m+8)*FIN)/((p+2)*(1<<s));
UCLK = (rCLKDIVN&8)?(UPLL>>1):UPLL;
}
void Main(void)
{
U8 key,sta;
int i;
U32 mpll_val = 0;
i = 2 ;
switch ( i ) {
case 0: //200
key = 12;
mpll_val = (92<<12)|(4<<4)|(1);
break;
case 1: //300
key = 13;
mpll_val = (67<<12)|(1<<4)|(1);
break;
case 2: //400M
key = 14;
mpll_val = (92<<12)|(1<<4)|(1);
break;
case 3: //440!!!
key = 14;
mpll_val = (102<<12)|(1<<4)|(1);
break;
default:
key = 14;
mpll_val = (92<<12)|(1<<4)|(1);
break;
}
//rMPLLCON赋值0x5c011
ChangeMPllValue((mpll_val>>12)&0xff, (mpll_val>>4)&0x3f, mpll_val&3);
ChangeClockDivider(key, 12); //key=14
cal_cpu_bus_clk();
Port_Init(); //IO端口初始化
SPI_Init();//SPI初始化
MMA7455L_INIT();//MMA7455L初始化
Uart_Init();//串口初始化
Uart_Select(0);
Delay(5); //延时10ms让IIC和SPI准备就绪
Uart_Printf("CLKCON=%x!",rCLKCON);
Uart_Printf("开始发送数据!\n\n");
//对MMA7455L的0x16寄存器写配置数据0x05
WriteByte_MMA7455L(0x16,0x05);
//读回0x16寄存器的配置值,判断SPI通信是否成功.
sta=ReadByte_MMA7455L(0x16);
Uart_Printf("sta=0x%x",sta);
while(1)
{
}
}
void WriteByte_MMA7455L(U8 addr,U8 dat)
{
int n;
//片选CS置低,使能MMA7455为SPI模式
rGPFDAT &= 0xef;
Delay(1);
Uart_Printf("SPI状态寄存器的数据为0x%x!\n",rSPSTA0);
while(!(rSPSTA0&0x01==0x01)) ;
//高位置1写操作
rSPTDAT0 = 0x80|((addr & 0x3f)<<1);
Uart_Printf("SPI状态寄存器的数据为0x%x!\n",rSPSTA0);
Uart_Printf("写操作地址发送成功!\n");
for(n=0;n<20;n++);
Uart_Printf("SPI状态寄存器的数据为0x%x!\n",rSPSTA0);
while(!(rSPSTA0&0x01==0x01)) ;
rSPTDAT0 = dat; //写数据
Uart_Printf("SPI状态寄存器的数据为0x%x!\n",rSPSTA0);
Uart_Printf("写操作数据发送成功!\n");
for(n=0;n<20;n++);
//片选CS置高电平,结束SPI通信
rGPFDAT |= 0xff;
Delay(1);
}
U8 ReadByte_MMA7455L(U8 addr)
{
int n;
U8 Re_Dat;
//片选CS置低电平,使能MMA7455L为SPI模式
rGPFDAT &= 0xef;
Delay(1);
Uart_Printf("SPI状态寄存器的数据为0x%x!\n",rSPSTA0);
while(!(rSPSTA0&0x01==0x01)) ;
//读操作高位清0
rSPTDAT0 = (addr & 0x3f)<<1;
Uart_Printf("SPI状态寄存器的数据为0x%x!\n",rSPSTA0);
Uart_Printf("读操作地址发送成功!\n");
for(n=0;n<20;n++);
Uart_Printf("SPI状态寄存器的数据为0x%x!\n",rSPSTA0);
while(!(rSPSTA0&0x01==0x01));
Re_Dat = rSPRDAT0;
Uart_Printf("SPI状态寄存器的数据为0x%x!\n",rSPSTA0);
for(n=0;n<20;n++);
//片选CS置高电平,结束SPI通信
rGPFDAT |= 0xff;
Delay(1);
//返回读取数据
return Re_Dat;
}
//MMA7455L初始化
void MMA7455L_INIT(void )
{
MMA_QUEUE.MMA_HEAD=0;
MMA_QUEUE.MMA_CUR=0;
SPI_WriteREG(0x16,0x05);//级别模式
delay_nus(10);
SPI_WriteREG(0x18,0x20);
delay_nus(10);
SPI_WriteREG(0x19,0x00);
delay_nus(10);
SPI_WriteREG(0x1a,0x00);
delay_nus(10);
}
//SPI初始化
void SPI_Init(void)
{
//激活时钟控制器的SPI位
rCLKCON |= 1 <<18;
rSPCON0 = (0<<6)|(0<<5)|(1<<4)|(1<<3)|(0<<2)|(0<<1)|1;
//查询模式;SCK使能;主机模式;时钟低电平有效;格式A;普通模式;
//MMA7455的SPI的传输波特率在工作电压小于2.4V时最高可达4MHz,大于2.4V时可达8MHz
//SPI波特率为50MHz/2/(24+1)=1MHz
rSPPRE0 = 24;
}

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