Redefinable CALCB1_16MHZ.

[goodfet] / firmware / lib / msp430x2618.c

diff --git a/firmware/lib/msp430x2618.c b/firmware/lib/msp430x2618.c
index 02ee1c0..ed437d7 100644 (file)
--- a/firmware/lib/msp430x2618.c
+++ b/firmware/lib/msp430x2618.c
@@ -1,7 +1,6 @@
 //! MSP430F2618 clock and I/O definitions
 
-// Ought to be portable to other 2xx chips.
-// 2274 looks particularly appealing.
+// Included by other 2xx ports, such as the 2274.
 
 #include "platform.h"
 
@@ -25,40 +24,52 @@ unsigned char serial_rx(){
 //! Receive a byte.
 unsigned char serial1_rx(){
   //TODO
+  return 00;
 }
 
-
 //! Transmit a byte.
 void serial_tx(unsigned char x){
-  while ((IFG2 & UCA0TXIFG) == 0); //loop unti lbuffer is free
+  while ((IFG2 & UCA0TXIFG) == 0); //loop until buffer is free
+  UCA0TXBUF = x;       /* send the character */
+  while(!(IFG2 & UCA0TXIFG));
+}
+//! Transmit a byte.
+void serial_tx_old(unsigned char x){
+  while ((IFG2 & UCA0TXIFG) == 0); //loop until buffer is free
   UCA0TXBUF = x;       /* send the character */
   while(!(IFG2 & UCA0TXIFG));
 }
 
 //! Transmit a byte on the second UART.
 void serial1_tx(unsigned char x){
+
 }
 
 //! Set the baud rate.
 void setbaud(unsigned char rate){
   
-  //http://mspgcc.sourceforge.net/baudrate.html
+  //Table 15-4, page 481 of 2xx Family Guide
   switch(rate){
   case 1://9600 baud
-    
+    UCA0BR1 = 0x06;
+    UCA0BR0 = 0x82;
     break;
   case 2://19200 baud
-    
+    UCA0BR1 = 0x03;
+    UCA0BR0 = 0x41;
     break;
   case 3://38400 baud
-    
+    UCA0BR1 = 0xa0;
+    UCA0BR0 = 0x01;
     break;
   case 4://57600 baud
-    
+    UCA0BR1 = 0x1d;
+    UCA0BR0 = 0x01;
     break;
   default:
   case 5://115200 baud
-    
+    UCA0BR0 = 0x8a;
+    UCA0BR1 = 0x00;
     break;
   }
 }
@@ -72,7 +83,6 @@ void setbaud1(unsigned char rate){
     
     break;
   case 2://19200 baud
-    
     break;
   case 3://38400 baud
     
@@ -87,36 +97,58 @@ void setbaud1(unsigned char rate){
   }
 }
 
-
-//host.h says 0x2B for DCO=4.9MHZ
-//Divide by four for accuracy.
-
-//19200
 #define BAUD0EN 0x41
 #define BAUD1EN 0x03
 
-
 void msp430_init_uart(){
+
   // Serial on P3.4, P3.5
   P3SEL |= BIT4 + BIT5;
   P3DIR |= BIT4;
-  
+
   //UCA0CTL1 |= UCSWRST;                    /* disable UART */
 
   UCA0CTL0 = 0x00;
   //UCA0CTL0 |= UCMSB ;
+
   UCA0CTL1 |= UCSSEL_2;                     // SMCLK
-  UCA0BR0 = BAUD0EN;                        // 115200
-  UCA0BR1 = BAUD1EN;
+
+  //UCA0BR0 = BAUD0EN;                        // 115200
+  //UCA0BR1 = BAUD1EN;
+  setbaud(5);//default baud, 115200
+
   UCA0MCTL = 0;                             // Modulation UCBRSx = 5
   UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**
-  
-}
 
 
+  //Leave this commented!
+  //Interrupt is handled by target code, not by bootloader.
+  //IE2 |= UCA0RXIE;
+}
+
+//! Initialize the MSP430 clock.
 void msp430_init_dco() {
-  BCSCTL1 = CALBC1_16MHZ;
-  DCOCTL = CALDCO_16MHZ;
+  if(CALBC1_16MHZ!=0xFF){
+    //Info is intact, use it.
+    BCSCTL1 = CALBC1_16MHZ;
+    DCOCTL = CALDCO_16MHZ;
+  }else{
+    //Info is missing, guess at a good value.
+    switch(*((int*)0xff0)){
+    default:
+    case 0x6ff2:        //f26f, the MSP430F2618
+      DCOCTL = 0x00;
+      #ifndef DCOVAL
+      #define DCOVAL 0x8f
+      #endif
+      BCSCTL1 = DCOVAL;   //CALBC1_16MHZ at 0x10f9
+      /** Observed DCOCTL values:
+         2618: 7f, 97
+      */
+      DCOCTL = 0x83;    //CALDCO_16MHZ at 0x10f8
+      break;
+    }
+  }
   
   return;
 }