Add light LCD position computation.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@817 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/drv/lcd_hd44.c b/drv/lcd_hd44.c
index 0bd7b3440e115640727afe24f48ef52f7fd6c7b8..01bd423d26214906c932785e4c6beef23814da75 100755 (executable)
--- a/drv/lcd_hd44.c
+++ b/drv/lcd_hd44.c
@@ -14,6 +14,9 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.4  2007/10/01 10:46:09  batt
+ *#* Add light LCD position computation.
+ *#*
  *#* Revision 1.3  2006/09/20 19:55:01  marco
  *#* Added CONFIG_LCD_4BIT.
  *#*
@@ -44,9 +47,19 @@
 #include <cfg/arch_config.h>
 #include <drv/timer.h>
 
+#if defined(LCD_READ_H) && defined(LCD_READ_L) && defined(LCD_WRITE_H) && defined(LCD_WRITE_L)
+       #define CONFIG_LCD_4BIT 1
+#elif defined(LCD_READ) && defined(LCD_WRITE)
+       #define CONFIG_LCD_4BIT 0
+#else
+       #error Incomplete or missing LCD_READ/LCD_WRITE macros
+#endif
+
 /** Flag di stato del display */
 #define LCDF_BUSY  BV(7)
 
+#if CONFIG_LCD_ADDRESS_FAST == 1
+#define lcd_address(x) lcd_address[x]
 /**
  * Addresses of LCD display character positions, expanded
  * for faster access (DB7 = 1).
@@ -94,6 +107,26 @@ static const uint8_t lcd_address[] =
 };
 
 STATIC_ASSERT(countof(lcd_address) == LCD_ROWS * LCD_COLS);
+#else  /* CONFIG_LCD_ADDRESS_FAST == 0 */
+
+static uint8_t col_address[] =
+{
+       0x80,
+       0xC0,
+#if LCD_ROWS > 2
+       0x94,
+       0xD4
+#endif
+};
+
+/**
+ * Addresses of LCD display character positions, calculated runtime to save RAM
+ */
+static uint8_t lcd_address(uint8_t addr)
+{
+       return col_address[addr / LCD_COLS] + addr % LCD_COLS;
+}
+#endif /* CONFIG_LCD_ADDRESS_FAST */
 
 /**
  * Current display position. We remember this to optimize
@@ -280,7 +313,7 @@ void lcd_moveTo(uint8_t addr)
        if (addr != lcd_current_addr)
        {
                lcd_waitBusy();
-               lcd_regWrite(lcd_address[addr]);
+               lcd_regWrite(lcd_address(addr));
                lcd_current_addr = addr;
        }
 }
@@ -306,7 +339,7 @@ void lcd_setReg(uint8_t val)
 void lcd_putc(uint8_t addr, uint8_t c)
 {
        if (addr != lcd_current_addr)
-               lcd_setReg(lcd_address[addr]);
+               lcd_setReg(lcd_address(addr));
 
        lcd_waitBusy();
        lcd_dataWrite(c);
@@ -318,7 +351,7 @@ void lcd_putc(uint8_t addr, uint8_t c)
 
        /* If we are at the end of a row put the cursor at the beginning of the next */
        if (!(lcd_current_addr % LCD_COLS))
-               lcd_setReg(lcd_address[lcd_current_addr]);
+               lcd_setReg(lcd_address(lcd_current_addr));
 }
 
 
@@ -343,7 +376,7 @@ void lcd_remapChar(const char *glyph, char code)
        }
 
        /* Move back to original address */
-       lcd_setReg(lcd_address[lcd_current_addr]);
+       lcd_setReg(lcd_address(lcd_current_addr));
 }