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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM7_LPC2368_Rowley/] [LCD/] [portlcd.c] - Rev 592
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/***************************************************************************** * * Project : lwIP Web * Subproject : * Name : portlcd.c * Function : Routines for LCD * Designer : K. Sterckx * Creation date : 22/01/2007 * Compiler : GNU ARM * Processor : LPC2368 * Last update : * Last updated by : * History : * based on example code from NXP * ************************************************************************ * * This code is used to place text on the LCD. * ************************************************************************/ #include <targets/LPC2368.h> #include "portlcd.h" #include "FreeRTOS.h" #include "task.h" /* Please note, on old MCB2300 board, the LCD_E bit is p1.30, on the new board it's p1.31, please check the schematic carefully, and change LCD_CTRL and LCD_E accordingly if you have a different board. */ /* LCD IO definitions */ #define LCD_E 0x80000000 /* Enable control pin */ #define LCD_RW 0x20000000 /* Read/Write control pin */ #define LCD_RS 0x10000000 /* Data/Instruction control */ #define LCD_CTRL 0xB0000000 /* Control lines mask */ #define LCD_DATA 0x0F000000 /* Data lines mask */ /* Local variables */ static unsigned int lcd_ptr; /* 8 user defined characters to be loaded into CGRAM (used for bargraph) */ static const unsigned char UserFont[8][8] = { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, { 0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10 }, { 0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18 }, { 0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C }, { 0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E }, { 0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F }, { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 } }; /* Local Function Prototypes */ static void lcd_write( unsigned int c ); static void lcd_write_4bit( unsigned int c ); static unsigned int lcd_read_stat( void ); static void lcd_write_cmd( unsigned int c ); static void lcd_write_data( unsigned int d ); static void lcd_wait_busy( void ); /****************************************************************************** ** Function name: lcd_write_4bit ** ** Descriptions: ** ** parameters: four bits to write ** Returned value: None ** ******************************************************************************/ static void lcd_write_4bit(unsigned int c) { /* Write a 4-bit command to LCD controller. */ FIO1DIR |= LCD_DATA | LCD_CTRL; FIO1CLR = LCD_RW | LCD_DATA; FIO1SET = (c & 0xF) << 24; FIO1SET = LCD_E; vTaskDelay(0); FIO1CLR = LCD_E; vTaskDelay(0); return; } /****************************************************************************** ** Function name: lcd_write ** ** Descriptions: ** ** parameters: word to write ** Returned value: None ** ******************************************************************************/ static void lcd_write(unsigned int c) { /* Write data/command to LCD controller. */ lcd_write_4bit (c >> 4); lcd_write_4bit (c); return; } /****************************************************************************** ** Function name: lcd_read_stat ** ** Descriptions: ** ** parameters: None ** Returned value: status ** ******************************************************************************/ static unsigned int lcd_read_stat(void) { /* Read status of LCD controller (ST7066) */ unsigned int stat; FIO1DIR &= ~LCD_DATA; FIO1CLR = LCD_RS; FIO1SET = LCD_RW; vTaskDelay( 0 ); FIO1SET = LCD_E; vTaskDelay( 0 ); stat = (FIO1PIN >> 20) & 0xF0; FIO1CLR = LCD_E; vTaskDelay( 0 ); FIO1SET = LCD_E; vTaskDelay( 0 ); stat |= (FIO1PIN >> 24) & 0xF; FIO1CLR = LCD_E; return (stat); } /****************************************************************************** ** Function name: lcd_wait_busy ** ** Descriptions: ** ** parameters: None ** Returned value: None ** ******************************************************************************/ static void lcd_wait_busy(void) { /* Wait until LCD controller (ST7066) is busy. */ unsigned int stat; do { stat = lcd_read_stat(); } while (stat & 0x80); /* Wait for busy flag */ return; } /****************************************************************************** ** Function name: lcd_write_cmd ** ** Descriptions: ** ** parameters: command word ** Returned value: None ** ******************************************************************************/ static void lcd_write_cmd(unsigned int c) { /* Write command to LCD controller. */ lcd_wait_busy(); FIO1CLR = LCD_RS; lcd_write(c); return; } /****************************************************************************** ** Function name: lcd_write_data ** ** Descriptions: ** ** parameters: data word ** Returned value: None ** ******************************************************************************/ static void lcd_write_data(unsigned int d) { /* Write data to LCD controller. */ lcd_wait_busy(); FIO1SET = LCD_RS; lcd_write(d); return; } /****************************************************************************** ** Function name: LCD_init ** ** Descriptions: ** ** parameters: None ** Returned value: None ** ******************************************************************************/ void LCD_init(void) { /* Initialize the ST7066 LCD controller to 4-bit mode. */ PINSEL3 = 0x00000000; #if USE_FIO SCS |= 0x00000001;/* set GPIOx to use Fast I/O */ #endif FIO1DIR |= LCD_CTRL | LCD_DATA; FIO1CLR = LCD_RW | LCD_RS | LCD_DATA; lcd_write_4bit(0x3); /* Select 4-bit interface */ vTaskDelay(100); lcd_write_4bit(0x3); vTaskDelay(100); lcd_write_4bit(0x3); lcd_write_4bit(0x2); lcd_write_cmd(0x28); /* 2 lines, 5x8 character matrix */ lcd_write_cmd(0x0e); /* Display ctrl:Disp/Curs/Blnk=ON */ lcd_write_cmd(0x06); /* Entry mode: Move right, no shift */ LCD_load( (unsigned char *)&UserFont, sizeof (UserFont) ); LCD_cls(); return; } /****************************************************************************** ** Function name: LCD_load ** ** Descriptions: ** ** parameters: pointer to the buffer and counter ** Returned value: None ** ******************************************************************************/ void LCD_load(unsigned char *fp, unsigned int cnt) { /* Load user-specific characters into CGRAM */ unsigned int i; lcd_write_cmd( 0x40 ); /* Set CGRAM address counter to 0 */ for (i = 0; i < cnt; i++, fp++) { lcd_write_data( *fp ); } return; } /****************************************************************************** ** Function name: LCD_gotoxy ** ** Descriptions: ** ** parameters: pixel X and Y ** Returned value: None ** ******************************************************************************/ void LCD_gotoxy(unsigned int x, unsigned int y) { /* Set cursor position on LCD display. Left corner: 1,1, right: 16,2 */ unsigned int c; c = --x; if (--y) { c |= 0x40; } lcd_write_cmd (c | 0x80); lcd_ptr = y*16 + x; return; } /****************************************************************************** ** Function name: LCD_cls ** ** Descriptions: ** ** parameters: None ** Returned value: None ** ******************************************************************************/ void LCD_cls(void) { /* Clear LCD display, move cursor to home position. */ lcd_write_cmd (0x01); LCD_gotoxy (1,1); return; } /****************************************************************************** ** Function name: LCD_cur_off ** ** Descriptions: ** ** parameters: None ** Returned value: None ** ******************************************************************************/ void LCD_cur_off(void) { /* Switch off LCD cursor. */ lcd_write_cmd(0x0c); return; } /****************************************************************************** ** Function name: LCD_on ** ** Descriptions: ** ** parameters: None ** Returned value: None ** ******************************************************************************/ void LCD_on(void) { /* Switch on LCD and enable cursor. */ lcd_write_cmd (0x0e); return; } /****************************************************************************** ** Function name: LCD_putc ** ** Descriptions: ** ** parameters: unsigned char character ** Returned value: None ** ******************************************************************************/ void LCD_putc(unsigned char c) { /* Print a character to LCD at current cursor position. */ if (lcd_ptr == 16) { lcd_write_cmd (0xc0); } lcd_write_data(c); lcd_ptr++; return; } /****************************************************************************** ** Function name: LCD_puts ** ** Descriptions: ** ** parameters: pointer to the buffer ** Returned value: None ** ******************************************************************************/ void LCD_puts(unsigned char *sp) { /* Print a string to LCD display. */ while (*sp) { LCD_putc (*sp++); } return; } /****************************************************************************** ** Function name: LCD_bargraph ** ** Descriptions: ** ** parameters: value and size ** Returned value: None ** ******************************************************************************/ void LCD_bargraph(unsigned int val, unsigned int size) { /* Print a bargraph to LCD display. */ /* - val: value 0..100 % */ /* - size: size of bargraph 1..16 */ unsigned int i; val = val * size / 20; /* Display matrix 5 x 8 pixels */ for (i = 0; i < size; i++) { if (val > 5) { LCD_putc(5); val -= 5; } else { LCD_putc(val); break; } } return; }
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