Proper getchar() routine, keypad arrangement. Close #2.

firmware/Makefile

@@ -5,7 +5,7 @@ CC = msp430-gcc -mmcu=cc430f6137 -Wall
 BSL = ../bin/cc430-bsl.py
 
 
-modules=main.o lcd.o lcdtext.o rtc.o
+modules=main.o lcd.o lcdtext.o rtc.o keypad.o
 
 all: goodwatch.hex
 

firmware/keypad.c

@@ -0,0 +1,127 @@
+#include <msp430.h>
+
+//Initializes the keypad pin directions.
+void key_init(){
+  /* The keypad uses P1.7 and all of Port 2.  Pins are bridged
+     together by rows and columns, which requires active scanning for
+     a read but can allow for an initial wakeup on an interrupt. */
+
+  P2SEL=0x00;  //All of port 2 are IO.
+  P2DIR=0x00;  //All are input.
+  P2REN|=0xFF; //All resistor.
+  P2OUT=0x00; //Pull all of them down.
+
+  P1SEL&=~0x80; //P1.7 is IO.
+  P1DIR&=~0x80; //P1.7 is input.
+  P1REN|=0x80;
+  P1OUT&=~0x80;  //Output low.
+}
+
+//! Bitfields indicate pressed rows.
+int key_row(){
+  int row;
+  P1DIR|=0x80; //P1.7 out.
+  P1OUT|=0x80; //P1.7 high.
+  P2DIR= 0x07;  //P2.0, 2.1, 2.2 out.
+  P2OUT= 0x07;  //P2.0, 2.1, 2.2 high.
+
+  //We'll return this result, but after cleaning up.
+  row=(P2IN>>3)&0x0F;
+
+  
+  P1DIR&=~0x80; //All input.
+  P2DIR=0x00; 
+  P1OUT&=~0x80; //All down.
+  P2OUT=0x00; 
+  
+  return row;
+}
+
+//! Bitfields indicate pressed columns.
+int key_col(){
+  int col;
+  P1DIR&=~0x80; //Input
+  P1OUT&=~0x80; //Low
+  P2DIR= 0xF8;  //P2.1.3, 2.4, 2.5, 2.6 out
+  P2OUT= 0xF8;  //P2.1.3, 2.4, 2.5, 2.6 high
+
+  //We'll return this result, but after cleaning up.
+  col=((P2IN&0x7)<<1) | ((P2IN&0x80)>>7);
+
+  P1DIR&=~0x80; //All input.
+  P2DIR=0x00; 
+  P1OUT&=~0x80; //All down.
+  P2OUT=0x00;
+
+  //Temporary workaround for what I think is hardware damage in my
+  //prototype.
+  if(col&~1)
+    return col&0xFE;
+
+  return col;
+}
+
+
+//! Returns the key code of the currently pressed button.
+unsigned int key_scan(){
+  /* This is the key matrix.  P2.7 isn't used, which would've been
+     nice to know earlier.
+
+      2.2  2.1  2.0  1.7
+       |    |    |    |
+2.3----+----+----+----+--10
+       |    |    |    |
+2.4----+----+----+----+--20
+       |    |    |    |
+2.5----+----+----+----+--40
+       |    |    |    |
+2.6----+----+----+----+--80
+       |    |    |    |
+      08   04   02   01
+  */
+
+  unsigned int scan=(key_row()<<4)|key_col();
+
+  if(scan&0xF0)
+    return scan;
+  else
+    return 0;
+}
+
+/* //! Map of presses to buttons. */
+/* const int keymap[4][4]={ */
+/*   //Lowest row has highest bitmask, so it comes first. */
+/*   {0, '.', '=', '+'}, */
+/*   {1, 2, 3, '-'}, */
+/*   {4, 5, 6, '*'}, */
+/*   {7, 8, 9, '%'} */
+/* }; */
+
+//! Map of presses to buttons.
+const unsigned int keymap[]={
+  /* Upper nybble is the scan code, lower nybble is the byte in ASCII.
+   */
+  0x1837, 0x1438,     0x1239,     0x1100|'%',
+  0x2834, 0x2435,     0x2236,     0x2100|'*',
+  0x4831, 0x4432,     0x4233,     0x4100|'-',
+  0x8830, 0x8400|'.', 0x8200|'=', 0x8100|'+',
+  0x0000 //End on a null byte.
+};
+
+//! Returns a character of the current scan code.
+unsigned int key_chr(code){
+  /* Row is the upper nybble, column is the lower nybble.*/
+  unsigned int i=0;
+  for(i=0;keymap[i];i++){
+    if(keymap[i]>>8==code)
+      return keymap[i]&0xFF;
+  }
+  
+  //Return null for all unknown codes.
+  return 00;
+}
+
+//! Gets a character as ASCII.
+char getchar(){
+  return key_chr(key_scan());
+}

firmware/keypad.h

@@ -0,0 +1,5 @@
+
+
+void key_init();
+char getchar();
+

firmware/lcd.c

@@ -47,34 +47,27 @@ void lcd_init() {
   lcd_zero();
   for(i=0;i<13;i++)
     lcdbm[i]=0xFF;
-
-  //Seems unwired?
-  lcdm[2]^=0x40;
-  //Weird top-right thingys.
-  //lcdm[9]|=0x04;
-  //lcdm[0x0a]|=0x40;
-  //lcdm[0x0c]|=0x01;
-
-  //Beyond the range.
-  //lcdm[0x0c]|=0x10;
 }
 
 //! Moved the LCD memory to the blink memory, then displays the backup.
 void lcd_predraw(){
-  //Copy the LCD memory to the blink memory, then display blink memory.
+  //Switch to the backup of the previous frame.
-  memcpy((char*) lcdbm,(char*) lcdm,13);
   LCDBMEMCTL |= LCDDISP; // Enable blink memory
 }
 
 //! Reverts to the main display.
 void lcd_postdraw(){
-  //Now swap back the buffer.
+  //Now swap back the buffer and copy it to blink memory for the next round.
   LCDBMEMCTL &= ~LCDDISP; // Return to main display memory.
+  memcpy((char*) lcdbm,(char*) lcdm,13);
 }
 
 //! LCD callback when the CPU wakes.
 void lcd_wdt(){
   lcd_predraw();
+  
+  //lcd_zero();
   draw_time();
+
   lcd_postdraw();
 }

firmware/lcdtext.c

@@ -18,7 +18,7 @@
 
 //This maps the segments of each digit.
 // A,      B,      C,      D,      E,      F,      G,     dp         digit
-const int map[10][8]={
+const int lcdmap[10][8]={
   {0x0b04, 0x0b40, 0x0b20, 0x0b01, 0x0a10, 0x0a20, 0x0b02, 0x0b10}, //0
   {0x0940, 0x0a04, 0x0a02, 0x0910, 0x0901, 0x0902, 0x0920, 0x0a01}, //1
   {0x0804, 0x0840, 0x0820, 0x0801, 0x0710, 0x0720, 0x0802, 0x0810}, //2
@@ -29,7 +29,11 @@ const int map[10][8]={
   {0x0040, 0x0104, 0x0102, 0x0010, 0x0001, 0x0002, 0x0020, 0x0201}, //7
 };
 
-enum mappos {A=1, B=2, C=4, D=8, E=0x10, F=0x20, G=0x40, DP=0x80};
+//These are the fragments of the day of the week: 0x0904, 0x0a40, 0x0c01
+//0x0c10 is beyond the screen.
+//0x0240 seems not to be wired to any visible segment.
+
+enum lcdmappos {A=1, B=2, C=4, D=8, E=0x10, F=0x20, G=0x40, DP=0x80};
 const int numfont[]={
   A|B|C|D|E|F,   //0
   B|C,           //1
@@ -50,15 +54,13 @@ const int numfont[]={
 };
 
 #define DRAWPOINT(todraw) lcdm[todraw>>8]|=todraw&0xFF
-#define DRAWPOINTB(todraw) lcdbm[todraw>>8]|=todraw&0xFF
 //! Draws one LCD digit.
 void lcd_digit(int pos, int digit){
   int segments=numfont[digit];
   int bit;
   for(bit=0;bit<8;bit++){
     if(segments&(1<<bit)){
-      DRAWPOINT(map[pos][bit]);
+      DRAWPOINT(lcdmap[pos][bit]);
-      //DRAWPOINTB(map[pos][bit]);
     }
   }
 }

firmware/main.c

@@ -8,6 +8,7 @@
 
 #include "lcd.h"
 #include "rtc.h"
+#include "keypad.h"
 
 //Initialize the XT1 crystal, and stabilize it.
 void xtal_init(){
@@ -34,6 +35,7 @@ int main(void) {
   lcd_init();
   xtal_init();
   rtc_init();
+  key_init();
 
   // Setup and enable WDT 250ms, ACLK, interval timer
   WDTCTL = WDT_ADLY_250;

firmware/rtc.c

@@ -64,9 +64,9 @@ void rtc_init(){
 
 void __attribute__ ((interrupt(RTC_VECTOR))) RTC_ISR (void){
   //Display the hex value if we ever drop here.
-  lcd_hex(0xC1000000|RTCIV);
+  //lcd_hex(0xC1000000|RTCIV);
   
-  //switch(__even_in_range(RTCIV,16))
+  //We don't really handly these, but might want to in the future.
   switch(RTCIV&~1){
     case 0: break;                          // No interrupts
     case 2: break;                          // RTCRDYIFG