MSP430F149單片機對SDRAM控制程序設計
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#include <msp430x14x.h>
本文引用地址：http://www.104case.com/article/201611/320795.htmvoid 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;
}
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