Closer to harmonizing different platforms.

[goodfet] / firmware / lib / msp430x2618.c

diff --git a/firmware/lib/msp430x2618.c b/firmware/lib/msp430x2618.c
index 02ee1c0..dcdafd5 100644 (file)
--- a/firmware/lib/msp430x2618.c
+++ b/firmware/lib/msp430x2618.c
@@ -1,17 +1,17 @@
 //! 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"
 
+#include "dco_calib.h"
+
 #include <signal.h>
 #include <io.h>
 #include <iomacros.h>
 
-
 //! Receive a byte.
-unsigned char serial_rx(){
+unsigned char serial0_rx(){
   char c;
   
   while(!(IFG2&UCA0RXIFG));//wait for a byte
@@ -25,40 +25,52 @@ 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
+void serial0_tx(unsigned char x){
+  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){
+void setbaud0(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;
   }
 }
@@ -66,57 +78,82 @@ void setbaud(unsigned char rate){
 //! Set the baud rate of the second uart.
 void setbaud1(unsigned char rate){
   
-  //http://mspgcc.sourceforge.net/baudrate.html
-  switch(rate){
-  case 1://9600 baud
-    
-    break;
-  case 2://19200 baud
-    
-    break;
-  case 3://38400 baud
-    
-    break;
-  case 4://57600 baud
-    
-    break;
-  default:
-  case 5://115200 baud
-    
-    break;
-  }
 }
 
-
-//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;
 }
 
 
+//! Initialization is correct.
+void msp430_init_dco_done(){
+  char *choice=(char *) 0x200; //First word of RAM.
+  choice[0]--;
+}
+
+//! Initialize the MSP430 clock.
 void msp430_init_dco() {
-  BCSCTL1 = CALBC1_16MHZ;
-  DCOCTL = CALDCO_16MHZ;
+  int i=1000;
+  char *choice=(char *) 0x200; //First word of RAM.
+  
+  #ifdef __MSP430_HAS_PORT8__
+  P8SEL = 0; // disable XT2 on P8.7/8
+  #endif
+  
+  //Set P2.6 mode for MSP430F2274
+  #ifndef __MSP430_HAS_PORT5__
+  P2SEL = 0; //disable XIN on 2274
+  #endif
+  
+  
+  if(CALBC1_16MHZ!=0xFF){
+    //Info is intact, use it.
+    BCSCTL1 = CALBC1_16MHZ;
+    DCOCTL = CALDCO_16MHZ;
+  }else{
+    /*
+      Info is missing, guess at a good value.
+      
+      A list of correct calibrations in included as dco_calib.c,
+      generated by script.
+    */
+    DCOCTL = 0x00; //clear DCO
+    
+    BCSCTL1 =  dco_calibrations[2*choice[0]+1];
+    DCOCTL  =  dco_calibrations[2*choice[0]];
+    choice[0]++;
+    choice[0]%=dco_calibrations_count;
+  }
+  
+  //Minor delay.
+  while(i--);
+  
+  
   
   return;
 }