test44x学习板里的实验程序.txt

主要是测试msp430x44x的读写

#include "msp430x44x.h"
//
// MSP430F449
// -----------------
// /|\| XIN|- 
// | | |
// --|RST XOUT|- ________
// | | | |
// | P6.0|-->| A |
// | P6.1| . | T |
// | P6.2| . | 4 |
// | P6.3| . | 5 |
// | P6.4| . | D |
// | P6.5| . | B |
// | P6.6|-->| 0 |
// | | | 4 | 
// | | | 1 |
// |________|
//
//本实验是将TAB中的数据写入AT45DB041中
//在将数据从AT45DB041读出，
//并将数据放入250为首地址的RAM中
int word;
int cmd_word;
int R_word;
int tab[16]={0x21,0x22,0x23,0x24,0x25,0x26};
int *Ram_addr;
int *Buff_addr;

void Send_Byte(void)
{
int i;
int Tamp;
for (i=0;i<8;i++)
{
P6OUT &= 0xDF;
Tamp = word;
Tamp &= 0x80;
if(!Tamp)
P6OUT &= 0xEF;
else
P6OUT |= 0x10;
P6OUT |= 0x20;
word = word << 1;
} 
} 

void Send_Start(void)
{
P6DIR |= 0X30;
P6OUT |= 0X20;
word = cmd_word;
Send_Byte();
}

void Stop(void)
{
P6DIR &= 0X00;
P6DIR |= 0X63;
P6OUT |= 0X63;
}

void Flash_B_Write(void)
{
int j;
P6DIR |= 0X40;
P6OUT &= 0XBF;
cmd_word = 0x84;
Send_Start();
word = 0x00;
Send_Byte();
word = 0x00;
Send_Byte();
word = 0x1A;
Send_Byte();
for(j=0;j<16;j++)
{
word = tab[j];
Send_Byte();
}
Buff_addr = (int *)0x1A;
Stop();
}

void Receive_Byte(void)
{
int i;
P6DIR |= 0X20;
P6DIR &= 0XF7;
R_word = 0x00;
P6OUT &= 0xBF;
for(i=0;i<8;i++)
{
P6OUT &= 0xDF;
P6OUT |= 0X20;
if(P6IN & 0x08)
R_word |= 0x01;
else
R_word &= 0xFE;
P6OUT &= 0xDF;
R_word = R_word << 1;
}
R_word = R_word >> 1;
}

void Flash_B_Read(void)
{
int j;
P6DIR |= 0X40;//CS out
P6OUT &= 0XBF;
cmd_word = 0x54;
Send_Start();
word = 0x00;
Send_Byte();
word = 0x00;
Send_Byte();
word = 0x1A;
Send_Byte();
word = 0xff;
Send_Byte();
for(j=0;j<16;j++)
{
Receive_Byte();
*Ram_addr++ = R_word;
}
Stop();
}

void main(void)
{
while(1){

int m = 0x7fff;
WDTCTL = WDTPW + WDTHOLD;
FLL_CTL1 = SELM_A + FLL_DIV_8;
P6DIR &= 0X00;
P6SEL &= 0X00;
P6DIR |= 0X63;
P6OUT |= 0X63;
Flash_B_Write();
while(m-- > 0);
Ram_addr = (int *)0x270;
Flash_B_Read();
}
}