#include <msp430f5529.h>
#include <math.h>


#define   START            0x80         // P2.7
#define   PWDN             0xFE         // P2.0
#define   RESET_BT         0xBF         // P2.6
#define   DRDY_0           0x02         // P2.1
#define   CS_0             0xEF         // P4.4



char STAT0[3], RESU0[24], STAT1[3], RESU1[24], RES[24];
char LOFF_P0, LOFF_N0, LOFF_P1, LOFF_N1, header, rx_data, rx_on=0, tx_on=0;



void configure_uart(void)
{
  P3SEL |= BIT3 + BIT4;                     // P3.3,4 = USCI_A0 TXD/RXD
  UCA0CTL1 |= UCSWRST;                      // **Put state machine in reset**
  UCA0CTL1 |= UCSSEL_2;                     // SMCLK
  UCA0BR0 = 0x08;                           // 8MMHz 921600 (see User's Guide)
  UCA0BR1 = 0x00;                           // 8MMHz 921600
  UCA0MCTL |= UCBRS_6 + UCBRF_8;            // Modulation UCBRSx=1, UCBRFx=0
  UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**
  UCA0IE |= UCRXIE;                         // Enable USCI_A0 RX inter
}



void configure_spi(void)                    //在這邊設定port4(解多工器) P4DIR P4OUT  
{
                                            // P1DIR |= 0x80  P1.7 for RESET_ADS
  P2DIR |= 0XC1;                            // P2.0, 6, 7 for PWDN, RESET_BT, START
  P3SEL |= BIT0 + BIT1 + BIT2;              // P3.0, 1, 2 SPI option select
  P4DIR |= 0X1F;                            // P2OUT |= ~CS_0 + ~CS_1   
                                            // P4.0, 1, 2, 3, 4 for A0, A1, A2, A3, E*
  P4OUT |= ~CS_0 ;                          // Disable CS   解多工器 E* = 1  Y0 - Y15 =1  

  UCB0CTL1 |= UCSWRST;                      // **Put state machine in reset**
  UCB0CTL0 |= UCMST+UCSYNC+UCMSB;           // 3-pin, 8-bit SPI master, MSB
  UCB0CTL1 |= UCSSEL_2;                     // SMCLK
  UCB0BR0 = 0x02;                           // /2   8.192/2 =4.096 等於 4.096 = 2*2.048
  UCB0BR1 = 0x00;                           //
  UCB0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine*
}



void main(void)
{
  char i;
  
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  


  P5SEL |= BIT2+BIT3;                       // Port select XT2

  UCSCTL6 &= ~XT2OFF;                       // Enable XT2 
  UCSCTL3 |= SELREF_2;                      // FLLref = REFO
                                            // Since LFXT1 is not used,
                                            // sourcing FLL with LFXT1 can cause
                                            // XT1OFFG flag to set
  UCSCTL4 |= SELA_2;                        // ACLK=REFO,SMCLK=DCO,MCLK=DCO

  // Loop until XT1,XT2 & DCO stabilizes - in this case loop until XT2 settles
  do
  {
    UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + DCOFFG);
                                            // Clear XT2,XT1,DCO fault flags
    SFRIFG1 &= ~OFIFG;                      // Clear fault flags
  }while (SFRIFG1&OFIFG);                   // Test oscillator fault flag

  UCSCTL6 &= ~XT2DRIVE0;                    // Decrease XT2 Drive according to
                                            // expected frequency
  UCSCTL4 |= SELS_5 + SELM_5;               // SMCLK=MCLK=XT2



  configure_uart();
  configure_spi();                      // Setup SPI
  
  P2OUT &= PWDN;                           //PWDN = 0
  P2OUT &= RESET_BT;                     // P2.6  RESET_BT
  P2OUT &= ~START;                         //START = 0
  P2OUT |= ~PWDN;                          //PWDN = 1
                                           //P2OUT |= ~CLKSEL;             // CLKSEL Pin =1 (內部振盪器512KHZ) 
    
  P4OUT &= CS_0;                        // CS=0 CS Enable
  
  while (!(UCB0IFG&UCTXIFG));            // SDATAC
  UCB0TXBUF = 0x11;
  
  
  while (!(UCB0IFG & UCTXIFG)); // RREG starting at address 0  00100001  00h 開始讀
UCB0TXBUF = 0x20;

while (!(UCB0IFG & UCTXIFG)); // 讀1個  Registers
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCTXIFG)); // first dummy data
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCTXIFG)); // another dummy data
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCRXIFG));
RES[0] = UCB0RXBUF;

    
  while (!(UCB0IFG&UCTXIFG));             //從01h開始寫 
  UCB0TXBUF = 0x41;
  
  for (i = 0; i < 10; i++);
 
  while (!(UCB0IFG&UCTXIFG));             //寫1個暫存器
  UCB0TXBUF = 0x00;

  for (i = 0; i < 10; i++);
  
  while (!(UCB0IFG&UCTXIFG));       // WREG CONFIG1 0x03   00000011  continuous mode, Data rate = 1KSPS
  UCB0TXBUF = 0x03;

  for (i = 0; i < 10; i++);
  
  
  
  while (!(UCB0IFG&UCTXIFG));             //從09h開始寫 
  UCB0TXBUF = 0x49;
  
  for (i = 0; i < 10; i++);
 
  while (!(UCB0IFG&UCTXIFG));             //寫1個暫存器
  UCB0TXBUF = 0x00;

  for (i = 0; i < 10; i++);
  
  while (!(UCB0IFG&UCTXIFG));       // WREG RESP1 0x02   00000010  
  UCB0TXBUF = 0x02;

  for (i = 0; i < 10; i++);
  
  
  
  while (!(UCB0IFG&UCTXIFG));             //從02h開始寫 
  UCB0TXBUF = 0x42;
  
  for (i = 0; i < 10; i++);
 
  while (!(UCB0IFG&UCTXIFG));             //寫2個暫存器
  UCB0TXBUF = 0x01;

  for (i = 0; i < 10; i++);
   
  
  while (!(UCB0IFG&UCTXIFG));             // WREG CONFIG2 0xA0   10100000  internal reference 2.4 V
  UCB0TXBUF = 0xA0;
  
  while (!(UCB0IFG&UCTXIFG));             // WREG Lead-Off Control Register 0x10   00010000
  UCB0TXBUF = 0x10;
  
  while (!(UCB0IFG&UCTXIFG));            //從04h開始寫
  UCB0TXBUF = 0x44;
  
  while (!(UCB0IFG&UCTXIFG));            //寫兩個暫存器
  UCB0TXBUF = 0x01;
   
  while (!(UCB0IFG&UCTXIFG));             // WREG CH1     0x10   00010000    
  UCB0TXBUF = 0x10;

  while (!(UCB0IFG&UCTXIFG));             // WREG CH2     0x81   10000001   power down CH2  
  UCB0TXBUF = 0x81;

  while (!(UCB0IFG&UCTXIFG));             //從08h開始寫 
  UCB0TXBUF = 0x48;

  while (!(UCB0IFG&UCTXIFG));            //寫一個暫存器
  UCB0TXBUF = 0x00;

  while (!(UCB0IFG&UCTXIFG));            //    01000000   CLK_DIV = 1 , CLK = 2.048MHZ    
  UCB0TXBUF = 0x40;
  
  while(UCB0STAT & UCBUSY);

 while (!(UCB0IFG & UCTXIFG)); // RREG starting at address 1  00100001  01h 開始讀
UCB0TXBUF = 0x21;

while (!(UCB0IFG & UCTXIFG)); // 讀9個  Registers
UCB0TXBUF = 0x08;
while (!(UCB0IFG & UCTXIFG)); // first dummy data
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCTXIFG)); // another dummy data
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCRXIFG));
RES[1] = UCB0RXBUF;
while (!(UCB0IFG & UCTXIFG));
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCRXIFG));
RES[2] = UCB0RXBUF;
while (!(UCB0IFG & UCTXIFG));
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCRXIFG));
RES[3] = UCB0RXBUF;
while (!(UCB0IFG & UCTXIFG));
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCRXIFG));
RES[4] = UCB0RXBUF;
while (!(UCB0IFG & UCTXIFG));
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCRXIFG));
RES[5] = UCB0RXBUF;
while (!(UCB0IFG & UCTXIFG));
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCRXIFG));
RES[6] = UCB0RXBUF;
while (!(UCB0IFG & UCTXIFG));
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCRXIFG));
RES[7] = UCB0RXBUF;
while (!(UCB0IFG & UCTXIFG));
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCRXIFG));
RES[8] = UCB0RXBUF;
UCB0TXBUF = 0x00;
while (!(UCB0IFG & UCRXIFG));
RES[9] = UCB0RXBUF;




  while(UCB0STAT & UCBUSY);           //SPI 如果UCBUSY=0 閒置  如果UCBUSY=1 USCI 正在接受或傳輸

  
  _EINT();
  
  P2OUT |= ~RESET_BT;
  
  while(1)                              //把 NOSTOP 和 STOP_AD 包含住
  { 
   while(rx_on==0);                     //rx_on=0 留在迴圈  rx_on不等於0 離開迴圈
   rx_on = 0;
   if(rx_data==0xff) goto NOSTOP;       //電腦透過RS232 UART 傳開始字元 FF 給UART RX BUFFER 
   goto STOP_AD;
     
NOSTOP:
   header = 0;
   P2OUT |= START;                       //START=1 開始做ADC轉換
  
   while (!(UCB0IFG&UCTXIFG));           // RDATAC
   UCB0TXBUF = 0x10;
  
   while(1)                       //進入NOSTOP迴圈後 便一值讀出ADC資料 直到UART 中斷為止(STOP_AD)
   { 
    while((P2IN & DRDY_0));       //P2.1 DRDY_0 是否為LOW ?   如果為LOW 則跳出迴圈(ADC資料準備好了)
  
    for (i = 0; i < 3; i++)      // Read Status register  會先傳狀態暫存器  總共三筆 3*8=24BITS
    { 
     while (!(UCB0IFG&UCTXIFG));                   
     UCB0TXBUF = 0x00;
  
     if(UCB0STAT & UCOE)
     {
      while (!(UCB0IFG&UCRXIFG));
      STAT0[0] = UCB0RXBUF;
     }
  
     while (!(UCB0IFG&UCRXIFG));
     STAT0[i] = UCB0RXBUF;                //i=0,1,2 三筆狀態資料
    }
  
    for (i = 0; i < 6; i++)       // Read Channel data  再傳CH值 ADS1291 2CH *24BITS=48BITS 一次傳8BITS
    { 
     while (!(UCB0IFG&UCTXIFG));            
     UCB0TXBUF = 0x00;
  
     while (!(UCB0IFG&UCRXIFG));         //ADS:MSB  UART:LSB SPI:MSB
     RESU0[i] = UCB0RXBUF;
    }
    
    RESU0[2]=RESU0[2] & 0xFE;            // RESU0[2]存第一個CH 第 7-0 個BIT?  &  11111110           
    RESU0[2]=RESU0[2] | header;          // 這邊看不太懂 為甚麼要 & 0xFE? | header? header 作用是?
    header++;                      //BIT0 =0,1,0,1,0,1    是否為UART傳輸?(起始0 結束1) 1-0 開始傳送 
    if ( header == 2 ) header = 0;
    
    for (i = 0; i < 3; i++)              // Send Channel data to BT  傳一個CH的DATA  只有傳CH1 DATA
    {
     while (!(UCA0IFG&UCTXIFG));         // USCI_A0 TX buffer ready?
     UCA0TXBUF = RESU0[i];               // i=0,1,2
     if(rx_on>0 && rx_data==0x00) goto STOP_AD;    //如果發生UART中斷 命令停止ADC取樣 則rx_on大於0 且 rx_data=0x00
    }
    while(UCA0STAT & UCBUSY);
    rx_on = 0;
   }                                              //繼續 NOSTOP While(1) 迴圈
STOP_AD:
   rx_on = 0;                           
  }
  
}

#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)    //P997 UART 中斷   猜想是電腦透過RS232 UART傳資料給RX Buffer 造成RX中斷
{
   rx_data = UCA0RXBUF;               //UART 使用 FF當作開始字元  00當作結束字元
   rx_on++;
}