--- /dev/null
+/***********************************************************************************\r
+Filename: lcd.c\r
+DESCRIPTION LCD Module utility functions.\r
+ Written for KS0066u compatible LCD Module.\r
+ (8 characters by 2 lines)\r
+\r
+Copyright : 2006 Renesas Technology Europe Ltd.\r
+Copyright : 2006 Renesas Technology Corporation.\r
+All Rights Reserved\r
+\r
+***********************************************************************************/\r
+\r
+/***********************************************************************************\r
+Revision History\r
+DD.MM.YYYY OSO-UID Description\r
+26.07.2006 RTE-MBA First Release\r
+***********************************************************************************/\r
+\r
+/**********************************************************************************\r
+System Includes\r
+***********************************************************************************/\r
+#include <machine.h>\r
+\r
+/**********************************************************************************\r
+User Includes\r
+***********************************************************************************/\r
+/* iodefine.h provides a structure to access all of the device registers. */\r
+#include "iodefine.h"\r
+/* rsk1664def.h provides common defines for widely used items. */\r
+#include "rskrx210def.h"\r
+#include "lcd.h"\r
+\r
+/*****************************************************************************\r
+Name: InitDisplay \r
+Parameters: none \r
+Returns: none\r
+Description: Intializes the LCD display. \r
+*****************************************************************************/\r
+void InitialiseDisplay( void )\r
+{\r
+ /* Power Up Delay for LCD Module */\r
+ EN_PIN = SET_BIT_HIGH;\r
+ DisplayDelay(7000);\r
+ EN_PIN = SET_BIT_LOW;\r
+ \r
+ /* Display initialises in 8 bit mode - so send one write (seen as 8 bit)\r
+ to set to 4 bit mode. */\r
+\r
+ /* Function Set */\r
+ LCD_nibble_write(CTRL_WR,0x03);\r
+ LCD_nibble_write(CTRL_WR,0x03);\r
+ DisplayDelay(39);\r
+ \r
+ /* Configure display */\r
+ LCD_nibble_write(CTRL_WR,0x03);\r
+ LCD_nibble_write(CTRL_WR,0x02);\r
+ LCD_nibble_write(CTRL_WR,(LCD_DISPLAY_ON | LCD_TWO_LINE ));\r
+ LCD_nibble_write(CTRL_WR,(LCD_DISPLAY_ON | LCD_TWO_LINE ));\r
+ DisplayDelay(39);\r
+\r
+ /* Display ON/OFF control */\r
+ LCD_write(CTRL_WR,LCD_CURSOR_OFF);\r
+ DisplayDelay(39);\r
+\r
+ /* Display Clear */\r
+ LCD_write(CTRL_WR,LCD_CLEAR);\r
+ DisplayDelay(1530);\r
+\r
+ /* Entry Mode Set */\r
+ LCD_write(CTRL_WR,0x06);\r
+ LCD_write(CTRL_WR,LCD_HOME_L1);\r
+}\r
+/**********************************************************************************\r
+End of function InitialiseDisplay\r
+***********************************************************************************/ \r
+\r
+/*****************************************************************************\r
+Name: DisplayString \r
+Parameters: position Line number of display\r
+ string Pointer to data to be written to display.\r
+ Last character should be null.\r
+Returns: none\r
+\r
+Description: This function controls LCD writes to line 1 or 2 of the LCD.\r
+ You need to use the defines LCD_LINE1 and LCD_LINE2 in order\r
+ to specify the starting position.\r
+ For example, to start at the 2nd position on line 1...\r
+ DisplayString(LCD_LINE1 + 1, "Hello")\r
+*****************************************************************************/\r
+void DisplayString(unsigned char position, char * string)\r
+{\r
+ static unsigned char next_pos = 0xFF;\r
+\r
+ /* Set line position if needed. We don't want to if we don't need \r
+ to because LCD control operations take longer than LCD data\r
+ operations. */\r
+ if( next_pos != position)\r
+ {\r
+ if(position < LCD_LINE2)\r
+ {\r
+ /* Display on Line 1 */\r
+ LCD_write(CTRL_WR, (unsigned char)(LCD_HOME_L1 + position) );\r
+ }\r
+ else\r
+ {\r
+ /* Display on Line 2 */\r
+ LCD_write(CTRL_WR, (unsigned char)(LCD_HOME_L2 + position - LCD_LINE2) );\r
+ }\r
+ /* set position index to known value */\r
+ next_pos = position; \r
+ }\r
+\r
+ do\r
+ {\r
+ LCD_write(DATA_WR,*string++);\r
+ /* increment position index */\r
+ next_pos++; \r
+ }\r
+ while(*string);\r
+}\r
+/**********************************************************************************\r
+End of function DisplayString\r
+***********************************************************************************/ \r
+\r
+/*****************************************************************************\r
+Name: LCD_write\r
+Parameters: value - the value to write\r
+ data_or_ctrl - To write value as DATA or CONTROL\r
+ 1 = DATA\r
+ 0 = CONTROL\r
+Returns: none\r
+\r
+Description: Writes data to display. Sends command to display. \r
+*****************************************************************************/\r
+void LCD_write(unsigned char data_or_ctrl, unsigned char value)\r
+{\r
+ /* Write upper nibble first */\r
+ LCD_nibble_write(data_or_ctrl, (value & 0xF0) >> 4);\r
+\r
+ /* Write lower nibble second */\r
+ LCD_nibble_write(data_or_ctrl, (value & 0x0F));\r
+}\r
+/**********************************************************************************\r
+End of function LCD_write\r
+***********************************************************************************/ \r
+\r
+/*****************************************************************************\r
+Name: LCD_nibble_write\r
+Parameters: value - the value to write\r
+ data_or_ctrl - To write value as DATA or CONTROL\r
+ 1 = DATA\r
+ 0 = CONTROL\r
+Returns: none\r
+\r
+Description: Writes data to display. Sends command to display. \r
+*****************************************************************************/\r
+void LCD_nibble_write(unsigned char data_or_ctrl, unsigned char value)\r
+{\r
+ unsigned char ucStore;\r
+ if (data_or_ctrl == DATA_WR)\r
+ {\r
+ RS_PIN = SET_BIT_HIGH;\r
+ }\r
+ else\r
+ {\r
+ RS_PIN = SET_BIT_LOW;\r
+ }\r
+ /* There must be 40ns between RS write and EN write */\r
+ DisplayDelay(1);\r
+ /* EN enable chip (HIGH) */\r
+ EN_PIN = SET_BIT_HIGH;\r
+ /* Tiny delay */ \r
+ DisplayDelay(1);\r
+ /* Clear port bits used */ \r
+ /* Set upper lower 4 bits of nibble on port pins. */\r
+ ucStore = DATA_PORT;\r
+ ucStore &= ~DATA_PORT_MASK;\r
+ /* OR in data */ \r
+ ucStore |= ((value << DATA_PORT_SHIFT) & DATA_PORT_MASK );\r
+ /* Write lower 4 bits of nibble */\r
+ DATA_PORT = ucStore;\r
+\r
+ /* write delay while En High */\r
+ DisplayDelay(20);\r
+ /* Latch data by dropping EN */ \r
+ EN_PIN = SET_BIT_LOW;\r
+ /* Data hold delay */ \r
+ DisplayDelay(20); \r
+\r
+ if(data_or_ctrl == CTRL_WR)\r
+ {\r
+ /* Extra delay needed for control writes */\r
+ DisplayDelay(40); \r
+ } \r
+}\r
+/**********************************************************************************\r
+End of function LCD_nibble_write\r
+***********************************************************************************/ \r
+\r
+/*****************************************************************************\r
+Name: DisplayDelay \r
+Parameters: units - Approximately in microseconds \r
+Returns: none \r
+\r
+Description: Delay routine for LCD display.\r
+*****************************************************************************/\r
+void DisplayDelay(unsigned long int units)\r
+{\r
+ unsigned long counter = units * DELAY_TIMING;\r
+ while(counter--)\r
+ {\r
+ nop(); // ~ 10ns\r
+ }\r
+}\r
+/**********************************************************************************\r
+End of function DisplayDelay\r
+***********************************************************************************/ \r
+\r
+\r
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