MSP430F149单片机对SDRAM控制程序设计

#include

void Init(void);

void Send(char* Data, unsigned int Length);

void SendAddress(unsigned int Address);

void SendData(unsigned int Data);

unsigned int ReceiveData(void);

char ReadData[20], Buffer[20];

unsigned char i=0, j, k, flag=0;

unsigned int Data;

unsigned int DisplayData;

char DisplayString[20];

void main(void)

{

WDTCTL = WDTPW + WDTHOLD; // Stop WDT

Init(); // UART1 inition

_EINT(); // enable interrupt

while(1)

{

DisplayData = ReceiveData();

if (DisplayData == 0)

{

k = 0;

if (DisplayData != 0)

{

DisplayString[k] = '0' + DisplayData % 10;

DisplayData = DisplayData / 10;

k++;

}

Send(DisplayString, k);

}

}

}

void Init(void)

{

UCTL1 &= ~SWRST; // reset swrst and usart1 enable

UCTL1 = 0x10; // 8-bit character

UBR01 = 0x03; // 8MHz 38400

UBR11 = 0x00; // 8MHz 38400

UMCTL1 = 0x4A; // U1CLK = SMCLK=TX2

UTCTL1 = 0x10;

ME2 |= 0x30; // Enable USART1 TXD/RXD

P3SEL= 0xC0; // enable P3.6,7 USART1 TXD/RXD

P3DIR= 0x40; // P3.6 output direction

IE2 |= URXIE1; // Enable USART1 RX interrupt

}

interrupt [UART1RX_VECTOR] void UART1RX(void) // read data

{

if (flag == 0) // wait for strat char of "0xAA" or "0xDD"

{

if (RXBUF1 == 0xAA) // alter flag

{

flag = 1;

}

else if (RXBUF1 == 0xDD) // alter flag

{

flag = 2;

}

i = 0;

}

else

{

ReadData[i] = RXBUF1;

if (ReadData[i++] == 0xFF) // end char of "0xFF"

{

Data = 0;

for (j=i-1; j!=0; j--)

{

Data = Data * 10 + (ReadData[j] - '0');

}

if (flag == 1) // send address

{

SendAddress(Data);

}

else if (flag == 2) // send data

{

SendData(Data);

}

flag = 0;

}

}

}

void Send(char* Data, unsigned int Length) // send data

{

unsigned int i;

UCTL1 |= TXWAKE;

TXBUF1 = 0x01;

while ((UTCTL1&0x01) == 0);

UCTL1 &= ~TXWAKE;

for(i=0; i<=Length; i++)

{

TXBUF1 = Data[i];

while ((UTCTL1&0x01) == 0);

}

}

void SendAddress(unsigned int Address) // send address

{

// address buses

P1DIR |= 0xE0; // P1.5-1.7 address buses

P2DIR = 0xFF; // P2.0-2.7 address buses

P3DIR |= 0x1F; // P3.0-3.5 address buses

P4DIR |= 0x1F; // P4.0-4.5 address buses

P1OUT |= (Address & 0x07);

P2OUT |= (Address & 0x7F8) >> 3;

P3OUT |= (Address & 0x1F800) >> 11;

P4OUT |= (Address & 0x7E0000) >> 17;

}

void SendData(unsigned int Data) // send data

{

// data buses

P4DIR |= 0xC0; // P4.6-4.7 data buses

P5DIR |= 0x1F; // P5.0-5.5 data buses

P4OUT |= (Data & 0x03);

P5OUT |= (Data & 0xFC) >> 2;

}

unsigned int ReceiveData(void) // send data

{

unsigned int Data;

// data buses

P4DIR &= 0x3F; // P4.6-4.7 data buses

P5DIR &= 0xE0; // P5.0-5.5 data buses

Data = ((P5IN & 0x1F) << 2) | ((P4IN & 0xC0) >> 6);

return Data;

}