X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=boards%2Fat91sam7s-ek%2Fhw%2Fhw_lcd.h;fp=boards%2Fat91sam7s-ek%2Fhw%2Fhw_lcd.h;h=3a206a0f5df48e0ef69fdd3d3935b6357142c204;hb=a22efc8dcc90c5fcb3811cf2667efb8a4e448134;hp=0000000000000000000000000000000000000000;hpb=bc0bd1c2cc28c168f9518cf6a4b11f09d39052fb;p=bertos.git diff --git a/boards/at91sam7s-ek/hw/hw_lcd.h b/boards/at91sam7s-ek/hw/hw_lcd.h new file mode 100644 index 00000000..3a206a0f --- /dev/null +++ b/boards/at91sam7s-ek/hw/hw_lcd.h @@ -0,0 +1,156 @@ +/** + * \file + * + * + * \brief LCD low-level hardware macros + * + * \version $Id$ + * + * \author Bernie Innocenti + * \author Stefano Fedrigo + * + */ + +#ifndef HW_LCD_H +#define HW_LCD_H + +#include "cfg/cfg_lcd.h" /* CONFIG_LCD_4BIT */ +#include /* BV() */ +#include + +#include +#include +#include + +#warning TODO:This is an example implementation, you must implement it! + +/** + * \name LCD I/O pins/ports + * @{ + */ +#define LCD_RS /* Implement me! */ +#define LCD_RW /* Implement me! */ +#define LCD_E /* Implement me! */ +#define LCD_DB0 /* Implement me! */ +#define LCD_DB1 /* Implement me! */ +#define LCD_DB2 /* Implement me! */ +#define LCD_DB3 /* Implement me! */ +#define LCD_DB4 /* Implement me! */ +#define LCD_DB5 /* Implement me! */ +#define LCD_DB6 /* Implement me! */ +#define LCD_DB7 /* Implement me! */ +/*@}*/ + +/** + * \name DB high nibble (DB[4-7]) + * @{ + */ + +#if CONFIG_LCD_4BIT + #define LCD_MASK (LCD_DB7 | LCD_DB6 | LCD_DB5 | LCD_DB4) + #define LCD_SHIFT 4 +#else + #define LCD_MASK (uint8_t)0xff + #define LCD_SHIFT 0 +#endif +/*@}*/ + +/** + * \name LCD bus control macros + * @{ + */ +#define LCD_CLR_RS /* Implement me! */ +#define LCD_SET_RS /* Implement me! */ +#define LCD_CLR_RD /* Implement me! */ +#define LCD_SET_RD /* Implement me! */ +#define LCD_CLR_E /* Implement me! */ +#define LCD_SET_E /* Implement me! */ + +#if CONFIG_LCD_4BIT + #define LCD_WRITE_H(x) ((void)x)/* Implement me! */ + #define LCD_WRITE_L(x) ((void)x)/* Implement me! */ + #define LCD_READ_H ( 0 /* Implement me! */ ) + #define LCD_READ_L ( 0 /* Implement me! */ ) +#else + #define LCD_WRITE(x) ((void)x)/* Implement me! */ + #define LCD_READ (0 /* Implement me! */ ) +#endif +/*@}*/ + +/** Set data bus direction to output (write to display) */ +#define LCD_DB_OUT /* Implement me! */ + +/** Set data bus direction to input (read from display) */ +#define LCD_DB_IN /* Implement me! */ + +/** Delay for write (Enable pulse width, 220ns) */ +#define LCD_DELAY_WRITE \ + do { \ + NOP; \ + NOP; \ + NOP; \ + NOP; \ + NOP; \ + } while (0) + +/** Delay for read (Data ouput delay time, 120ns) */ +#define LCD_DELAY_READ \ + do { \ + NOP; \ + NOP; \ + NOP; \ + NOP; \ + } while (0) + + +INLINE void lcd_bus_init(void) +{ + cpu_flags_t flags; + IRQ_SAVE_DISABLE(flags); + + /* + * Here set bus pin! + * to init a lcd device. + * + */ + + /* + * Data bus is in output state most of the time: + * LCD r/w functions assume it is left in output state + */ + LCD_DB_OUT; + + + IRQ_RESTORE(flags); +} + +#endif /* HW_LCD_H */