#include "msp430f149.h"
#include "my.h"
#define Number_of_Results 5
unsigned int results[Number_of_Results];
unsigned int average = 0;
unsigned char nADC_Flag = 0 ;
void main()
{
unsigned char i=0;
unsigned char buffer[6];
buffer[5] = '\0';
WDTCTL = WDTPW + WDTHOLD;
_DINT();
Init_CLK();
Init_ADC();
Init_TimerA();
Init_UART();
_EINT();
for(;;)
{
if(nADC_Flag==1)
{
nADC_Flag = 0 ;
Trans_val(average,buffer);
buffer[4]=0x3b-0x30;
buffer[3]= buffer[2];
buffer[2] = buffer[1];
buffer[1] = '.'-0x30;
for(i = 0; i < 4; i++)
buffer[i] += 0x30;
PutString(buffer);
break;
}
}
}
void Init_CLK(void)
{
unsigned char i;
//将寄存器的内容清零
//XT2振荡器开启
//LFTX1工作在低频模式
//ACLK的分频因子为1
BCSCTL1 = 0x00;
do
{
//清除标志
IFG1 &= ~OFIFG;
for( i = 0x3f ; i>0; i--);
}while((IFG1 & OFIFG) );
BCSCTL2 = 0x00;
//MCLK的时钟源为8MHZ，分频因子默认为1.
BCSCTL2 += SELM_2 + DIVM_3;
//SMCLK的时钟源为8MHZ,分频因子默认为1.
BCSCTL2 += SELS + DIVS_3 ;
return;
}
void Init_ADC(void)
{
//设置P6.0为模拟输入通道
P6SEL = 0x01;
//设置ENC为0，从而修改ADC12寄存器的值
ADC12CTL0 &= ~(ENC);
//转换的起始地址为：ADCMEM0
ADC12CTL1 |= CSTARTADD_0;
//选择通道为A0
ADC12MCTL0 = INCH_0 ;
//打开ADC12内核
ADC12CTL0 |= ADC12ON;
//ADC触发的首次SHI决定，然后，自动的。。
ADC12CTL0 |= MSC;
//单通道单次转换
ADC12CTL1 |= CONSEQ_0;
//时钟源为SMCLK
ADC12CTL1 |= ADC12SSEL_3;//选择时钟为SMCLK
ADC12CTL1 |= ADC12DIV_1;
ADC12CTL1 |= SHP;
//使能ADC
ADC12CTL0 |= ENC;
return ;
}
void Init_TimerA(void)
{
TACTL = SSEL1 + TACLR;
TACTL += ID1;
TACTL += ID0;
//CCR0允许中断
CCTL0 = CCIE;
//频率为250HZ;
CCR0 = 4000;
//计数模式
TACTL |= MC0;
return ;
}
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A(void)
{
static int index = 0;
ADC12CTL0 &= ~ENC;
results[index++] = ADC12MEM0;
if(index == Number_of_Results)
{
unsigned char i = 0;
for(i = 0 ; i < Number_of_Results ; i++)
{
average +=results[i];
}
average >>= 5 ;
index = 0;
nADC_Flag = 1;
}
ADC12CTL0 |= ENC + ADC12SC;
}
void Init_UART(void)
{
P3SEL |= 0x30; // P3.4,5 = USART0 TXD/RXD
ME1 |= URXE0 + UTXE0; // Enable USART0 T/RXD
UCTL0 |= CHAR; // 8-bit character
UTCTL0 |= SSEL1; // UCLK = SMCLK
UBR00 = 0x1A; // 38400 32k/9600 - 3.41
UBR10 = 0x00; //
UMCTL0 = 0x00; // Modulation
UCTL0 &= ~SWRST; // Initialize USART state machine
}
void Send1Char(unsigned char sendchar)
{
while (!(IFG1 & UTXIFG0)); //等待发送寄存器为空
TXBUF0 = sendchar;
}
void PutString0(unsigned char *ptr)
{
while(*ptr != '\0')
{
Send1Char(*ptr++); // 发送数据
}
}
void PutString(unsigned char*ptr)
{
while(*ptr != '\0')
{
Send1Char(*ptr++); // 发送数据
}
while (!(IFG1 & UTXIFG0));
//发送换行指令
}
void Trans_val( unsigned int Hex_Val, unsigned char *ptr)
{
unsigned long caltmp;
unsigned Curr_Volt;
unsigned t1;
caltmp = Hex_Val;
caltmp = (caltmp << 5) + Hex_Val; //caltmp = Hex_Val * 33
caltmp = (caltmp << 3) + (caltmp << 1); //caltmp = caltmp * 10
Curr_Volt = caltmp >> 12; //Curr_Volt = caltmp / 2^n
ptr[0] = Curr_Volt / 100; //Hex->Dec变换
t1 = Curr_Volt - (ptr[0] * 100);
ptr[1] = t1 / 10;
ptr[2] = t1 - (ptr[1] * 10);
return;
}
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