add shift down sign, change GUI keys, bump version

src/lcd.c

@@ -201,6 +201,13 @@ void LCD_Open(void) {
 		LCD_OutChar(0x10);
 		LCD_OutChar(0x1c);
 	}
+	//program shift down sign
+	for (i = 0; i < 5; i++){
+		LCD_OutChar(0x0);
+	}
+	LCD_OutChar(0x1F);
+	LCD_OutChar(0x0E);
+	LCD_OutChar(0x04);
 
 	//clear display
 	LCD_Clear();

src/lcd.h

@@ -38,6 +38,7 @@ void LCD_ClearToEnd(uint8_t curr_row);
 //CGRAM character address
 #define CGRAM_EXP 0
 #define CGRAM_EXP_NEG 1
+#define CGRAM_DOWN 2
 
 #include "utils.h"
 #ifdef DESKTOP

src/lcd_emulator.c

@@ -131,6 +131,8 @@ short TERMIO_PutChar(unsigned char letter) {
 		lcd_buf[lcd_row][lcd_col] = 'E';
 	} else if (letter == CGRAM_EXP_NEG) {
 		lcd_buf[lcd_row][lcd_col] = '-';
+	} else if (letter == CGRAM_DOWN) {
+		lcd_buf[lcd_row][lcd_col] = 'V';
 	} else {
 		lcd_buf[lcd_row][lcd_col] = letter;
 	}

src/main.c

@@ -140,7 +140,7 @@ static void latch_on(void)
 
 __xdata char EntryBuf[MAX_CHARS_PER_LINE + 1];
 __xdata uint8_t ExpBuf[2];
-__code const char VER_STR[32+1] = "STC RPN         Calculator v1.10";
+__code const char VER_STR[32+1] = "STC RPN         Calculator v1.11";
 
 
 enum {
@@ -530,7 +530,7 @@ int main()
 			TERMIO_PutChar(' ');
 #endif
 		} else if (IsShiftedDown){
-			TERMIO_PutChar('v');
+			TERMIO_PutChar(CGRAM_DOWN);
 		}
 
 #ifdef DESKTOP