#include "adc.h"
int gain;
void Init_CLK(void)
{
    unsigned int i;
    //將寄存器的內容清零
    //XT2震蕩器開啟
    //LFTX1工作在低頻模式
    //ACLK的分頻因子為1
    BCSCTL1 = 0X00;			
					
					
    do 
    {
        // 清除OSCFault標志
	IFG1 &= ~OFIFG;                       
	for (i = 0x20; i > 0; i--);                
    }
    while ((IFG1 & OFIFG) == OFIFG);      // 如果OSCFault =1   
				
    //open XT2, LFTX2 選擇低頻率
    BCSCTL1 &= ~(XT2OFF + XTS);
    //DCO Rsel=7(Freq=3200k/25攝氏度）  
    BCSCTL1 |= RSEL0 + RSEL1 + RSEL2; 
    BCSCTL1 |= 0x07;
    //MCLK的時鐘源為TX2CLK，分頻因子為1
    BCSCTL2 += SELM1;		
    //SMCLK的時鐘源為TX2CLK，分頻因子為1
    BCSCTL2 += SELS;		
    
}
void Init_ADC(void)
{
    //設置P6.0為模擬輸入通道
    P6SEL = 0X01;       
    
    //設置ENC為0，從而修改ADC12寄存器的值
    ADC12CTL0 &= ~(ENC); 
    //轉換的起始地址為：ADCMEM0
    ADC12CTL1 |= CSTARTADD_0;

    //設置參考電壓分別為AVSS和AVCC，輸入通道為A0
    ADC12MCTL0 = INCH_0;    
            
    ADC12CTL0 |= ADC12ON;
    ADC12CTL0 |= MSC;
    
    //轉換模式為：單通道、單次轉換
    ADC12CTL1 |= CONSEQ_0;
    //時鐘源為SMCLK
    ADC12CTL1 |= ADC12SSEL_1;
    //時鐘分頻為1
    ADC12CTL1 |= ADC12DIV_0;
    //采樣脈沖由采用定時器產生
    ADC12CTL1 |= (SHP);
                
    //使能ADC轉換
    ADC12CTL0 |= ENC;
    return;
}
void Init_TimerA(void)
{
    // 選擇SMCLK，清除TAR
    TACTL = TASSEL1 + TACLR; 
    // CCR0 中斷允許
    CCTL0 = CCIE;	
    //200Hz
    CCR0 = 40000;	
    // 增記數模式 
    TACTL |= MC0;	     
}
void Init_Port(void)
{
    //將P1、P2、P3、P4、P5、P6口的管腳設置為一般I/O口
    P1SEL = 0;
    P2SEL = 0;
    P3SEL = 0;
    P4SEL = 0;
    P5SEL = 0;
    P6SEL = 0;
    
    //設置管腳為輸入管腳
    P1DIR = 0;
    P2DIR = 0;
    P3DIR = 0;
    P4DIR = 0;
    P5DIR = 0;
    P6DIR = 0;
    
    //設置P1.0、P1.1和P1.3為輸出管腳
    P1DIR |= BIT0;
    P1DIR |= BIT1;
    P1DIR |= BIT3;
    
    // 將中斷寄存器清零
    P1IE = 0;
    P1IES = 0;
    P1IFG = 0;
    
    // 管腳 START 使能中斷
    P1IE |= BIT2;	
    // 對應的管腳由高到低電平跳變使相應的標志置位
    P1IES |= BIT2;		
  
    return;
}
void Delay_us(unsigned long nValue)//微秒為單位，8MHz為主時鐘
{
    int nCount;
    int i;
    int j;
    nCount = 3;
    for(i = nValue;i > 0;i--)
    {
    	for(j = nCount;j > 0;j--);
    }
    return;
}
void setGain(unsigned int nValue)
{
    //增益為1
    if(nValue == 1)
    {
        P1OUT = 0x00;
    }
    //增益為10
    if(nValue == 10)
    {
        P1OUT = 0x00;
        P1OUT |= BIT0;
    }
    //增益為100
    if(nValue == 100)
    {
        P1OUT = 0x00;
        P1OUT |= BIT1;
    }
    //增益為1000
    if(nValue == 1000)
    {
        P1OUT = 0x00;
        P1OUT |= BIT0;
        P1OUT |= BIT1;
    }
    
    gain = nValue;
}
int getGain(void)
{
    return gain;
}