/* most of this is taken from the file */ /* hal/powerpc/cogent/current/src/hal_diag.c in the */ /* Cygnus eCos source. Here is the copyright notice: */ /* */ /*============================================================================= */ /* */ /* hal_diag.c */ /* */ /* HAL diagnostic output code */ /* */ /*============================================================================= */ /*####COPYRIGHTBEGIN#### */ /* */ /* ------------------------------------------- */ /* The contents of this file are subject to the Cygnus eCos Public License */ /* Version 1.0 (the "License"); you may not use this file except in */ /* compliance with the License. You may obtain a copy of the License at */ /* http://sourceware.cygnus.com/ecos */ /* */ /* Software distributed under the License is distributed on an "AS IS" */ /* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the */ /* License for the specific language governing rights and limitations under */ /* the License. */ /* */ /* The Original Code is eCos - Embedded Cygnus Operating System, released */ /* September 30, 1998. */ /* */ /* The Initial Developer of the Original Code is Cygnus. Portions created */ /* by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. */ /* ------------------------------------------- */ /* */ /*####COPYRIGHTEND#### */ /*============================================================================= */ /*#####DESCRIPTIONBEGIN#### */ /* */ /* Author(s): nickg, jskov */ /* Contributors: nickg, jskov */ /* Date: 1999-03-23 */ /* Purpose: HAL diagnostic output */ /* Description: Implementations of HAL diagnostic output support. */ /* */ /*####DESCRIPTIONEND#### */ /* */ /*============================================================================= */ /*----------------------------------------------------------------------------- */ /* Cogent board specific LCD code */ #include <common.h> #include <stdarg.h> #include <board/cogent/lcd.h> static char lines[2][LCD_LINE_LENGTH+1]; static int curline; static int linepos; static int heartbeat_active; /* make the next two strings exactly LCD_LINE_LENGTH (16) chars long */ /* pad to the right with spaces if necessary */ static char init_line0[LCD_LINE_LENGTH+1] = "U-Boot Cogent "; static char init_line1[LCD_LINE_LENGTH+1] = "mjj, 11 Aug 2000"; static inline unsigned char lcd_read_status(cma_mb_lcd *clp) { /* read the Busy Status Register */ return (cma_mb_reg_read(&clp->lcd_bsr)); } static inline void lcd_wait_not_busy(cma_mb_lcd *clp) { /* * wait for not busy * Note: It seems that the LCD isn't quite ready to process commands * when it clears the BUSY flag. Reading the status address an extra * time seems to give it enough breathing room. */ while (lcd_read_status(clp) & LCD_STAT_BUSY) ; (void)lcd_read_status(clp); } static inline void lcd_write_command(cma_mb_lcd *clp, unsigned char cmd) { lcd_wait_not_busy(clp); /* write the Command Register */ cma_mb_reg_write(&clp->lcd_cmd, cmd); } static inline void lcd_write_data(cma_mb_lcd *clp, unsigned char data) { lcd_wait_not_busy(clp); /* write the Current Character Register */ cma_mb_reg_write(&clp->lcd_ccr, data); } static inline void lcd_dis(int addr, char *string) { cma_mb_lcd *clp = (cma_mb_lcd *)CMA_MB_LCD_BASE; int pos, linelen; linelen = LCD_LINE_LENGTH; if (heartbeat_active && addr == LCD_LINE0) linelen--; lcd_write_command(clp, LCD_CMD_ADD + addr); for (pos = 0; *string != '\0' && pos < linelen; pos++) lcd_write_data(clp, *string++); } void lcd_init(void) { cma_mb_lcd *clp = (cma_mb_lcd *)CMA_MB_LCD_BASE; int i; /* configure the lcd for 8 bits/char, 2 lines and 5x7 dot matrix */ lcd_write_command(clp, LCD_CMD_MODE); /* turn the LCD display on */ lcd_write_command(clp, LCD_CMD_DON); curline = 0; linepos = 0; for (i = 0; i < LCD_LINE_LENGTH; i++) { lines[0][i] = init_line0[i]; lines[1][i] = init_line1[i]; } lines[0][LCD_LINE_LENGTH] = lines[1][LCD_LINE_LENGTH] = 0; lcd_dis(LCD_LINE0, lines[0]); lcd_dis(LCD_LINE1, lines[1]); printf("HD44780 2 line x %d char display\n", LCD_LINE_LENGTH); } void lcd_write_char(const char c) { int i, linelen; /* ignore CR */ if (c == '\r') return; linelen = LCD_LINE_LENGTH; if (heartbeat_active && curline == 0) linelen--; if (c == '\n') { lcd_dis(LCD_LINE0, &lines[curline^1][0]); lcd_dis(LCD_LINE1, &lines[curline][0]); /* Do a line feed */ curline ^= 1; linelen = LCD_LINE_LENGTH; if (heartbeat_active && curline == 0) linelen--; linepos = 0; for (i = 0; i < linelen; i++) lines[curline][i] = ' '; return; } /* Only allow to be output if there is room on the LCD line */ if (linepos < linelen) lines[curline][linepos++] = c; } void lcd_flush(void) { lcd_dis(LCD_LINE1, &lines[curline][0]); } void lcd_write_string(const char *s) { char *p; for (p = (char *)s; *p != '\0'; p++) lcd_write_char(*p); } void lcd_printf(const char *fmt, ...) { va_list args; char buf[CONFIG_SYS_PBSIZE]; va_start(args, fmt); (void)vsprintf(buf, fmt, args); va_end(args); lcd_write_string(buf); } void lcd_heartbeat(void) { cma_mb_lcd *clp = (cma_mb_lcd *)CMA_MB_LCD_BASE; #if 0 static char rotchars[] = { '|', '/', '-', '\\' }; #else /* HD44780 Rom Code A00 has no backslash */ static char rotchars[] = { '|', '/', '-', '\315' }; #endif static int rotator_index = 0; heartbeat_active = 1; /* write the address */ lcd_write_command(clp, LCD_CMD_ADD + LCD_LINE0 + (LCD_LINE_LENGTH - 1)); /* write the next char in the sequence */ lcd_write_data(clp, rotchars[rotator_index]); if (++rotator_index >= (sizeof rotchars / sizeof rotchars[0])) rotator_index = 0; } #ifdef CONFIG_SHOW_ACTIVITY void board_show_activity (ulong timestamp) { #ifdef CONFIG_STATUS_LED if ((timestamp % (CONFIG_SYS_HZ / 2) == 0) lcd_heartbeat (); #endif } void show_activity(int arg) { } #endif