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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://chibios-gfx.com/license.html
*/
/**
* @file drivers/tdisp/HD44780/tdisp_lld.c
* @brief TDISP driver subsystem low level driver source for the HD44780 display
*
* @addtogroup TDISP
* @{
*/
#include "gfx.h"
#if GFX_USE_TDISP /*|| defined(__DOXYGEN__)*/
/* check first if the user has defined his/her own lowlevel-board file */
#if defined(TDISP_USE_CUSTOM_BOARD) && TDISP_USE_CUSTOM_BOARD
/* Include the user supplied board definitions */
#include "tdisp_lld_board.h"
#elif defined(BOARD_OLIMEX_STM32_E407)
#include "tdisp_lld_board_olimex_e407.h"
#elif defined(BOARD_ST_STM32F4_DISCOVERY)
#include "tdisp_lld_board_example.h"
#endif
/* Controller Specific Properties */
#define CUSTOM_CHAR_COUNT 8
#define CUSTOM_CHAR_XBITS 5
#define CUSTOM_CHAR_YBITS 8
/* Define the properties of our controller */
tdispStruct TDISP = {
TDISP_COLUMNS, TDISP_ROWS, /* cols, rows */
CUSTOM_CHAR_XBITS, CUSTOM_CHAR_YBITS, /* charBitsX, charBitsY */
CUSTOM_CHAR_COUNT /* maxCustomChars */
};
/* display control settings */
#define TDISP_DISPLAY_ON 0x04
#define TDISP_CURSOR_ON 0x02
#define TDISP_CURSOR_BLINK 0x01
/* cursor movement settings */
#define TDISP_SHIFT_ON 0x01
#define TDISP_CURSOR_INC 0x02
/* display scroll settings */
#define TDISP_SCROLL_DISPLAY 0x08
#define TDISP_SCROLL_RIGHT 0x04
static uint8_t displaycontrol;
static uint8_t cursorcontrol;
bool_t tdisp_lld_init(void) {
/* initialise hardware */
init_board();
/* The first part is the initialing code.
* In this part only the lower nibble of the
* byte is written directly to the display, thus
* without write_cmd, which sends both high and
* low nibble.
*/
/* Give the LCD a little time to wake up */
gfxSleepMilliseconds(15);
/* clear the RS-line to the display */
palClearPad(PORT_CTRL, PIN_RS);
// #if BUS_4BITS
/* write three times 0x03 to display (4-bit mode only)
* with RS = low.
*/
writeToLCD(0x03); // 1x
gfxSleepMilliseconds(20);
writeToLCD(0x03); // 2x
// gfxSleepMilliseconds(20);
writeToLCD(0x03); // 3x
// gfxSleepMilliseconds(20);
/* Put display in 4-bit mode by
* write 0x02 to display.
*/
writeToLCD(0x02); // 4bit-modus
// gfxSleepMilliseconds(20);
// #else
/* write three times 0x30 to display (8-bit mode only)
* with RS = low.
*/
// writeToLCD(0x30); // 1x
// writeToLCD(0x30); // 2x
// writeToLCD(0x30); // 3x
// #endif
/* From this point on, the LCD accepts
* bytes sent with highnibbel first and than
*the lownibble if working in 4-bit mode.
* In 8-bit mode bytes are written in 1 action.
*/
/* 4-bit modus, 2 lines en 5x7 characters */
write_cmd(0x28);
// gfxSleepMilliseconds(20);
/* set display on, cursor off and no blinking */
write_cmd(0x0C);
// gfxSleepMilliseconds(20);
/* set cursor increase and direction */
write_cmd(0x06);
// gfxSleepMilliseconds(20);
displaycontrol = TDISP_DISPLAY_ON;
cursorcontrol = TDISP_CURSOR_INC;
/* END OF INITIALISATION */
return TRUE;
}
/* Clears the display. The display needs
* a long time to process this command. So
* an extra delay is insterted.
*/
void tdisp_lld_clear(void) {
write_cmd(0x01);
}
/* Writes a character to the display */
void tdisp_lld_draw_char(char c) {
write_data(c);
}
/* Set cursor position */
void tdisp_lld_set_cursor(coord_t col, coord_t row) {
static const uint8_t row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
/*
* Short-cut:
*
* If x and y = 0 then use the home command.
*
* Note: There is probably no advantage as both commands are a single byte
*/
// if (col == 0 && row == 0) {
// write_cmd(0x02);
// return;
// }
write_cmd(0x80 | (col + row_offsets[row]));
// write_cmd(0x80 | (0x40 + col));
}
/* Create a custom character to the display */
void tdisp_lld_create_char(uint8_t address, uint8_t *charmap) {
int i;
write_cmd(0x40 | (address << 3));
for(i = 0; i < CUSTOM_CHAR_YBITS; i++) {
write_data(charmap[i]);
}
}
/* Write display control commands to the display */
void tdisp_lld_control(uint16_t what, uint16_t value) {
switch(what) {
case TDISP_CTRL_DISPLAY:
switch (value) {
case displayOff:
displaycontrol &= ~TDISP_DISPLAY_ON;
break;
case displayOn:
displaycontrol |= TDISP_DISPLAY_ON;
break;
}
write_cmd(0x08 | displaycontrol);
break;
case TDISP_CTRL_CURSOR:
switch (value) {
case cursorBlinkingBlock:
case cursorBlinkingUnderline:
case cursorBlinkingBar:
displaycontrol |= TDISP_CURSOR_ON + TDISP_CURSOR_BLINK;
break;
case cursorBlock:
case cursorUnderline:
case cursorBar:
displaycontrol = (displaycontrol | TDISP_CURSOR_ON) & ~TDISP_CURSOR_BLINK;
break;
case cursorOff:
default:
displaycontrol &= ~(TDISP_CURSOR_ON | TDISP_CURSOR_BLINK); // zet alleen de cursor uit. Bewaar de overige instellingen
break;
}
write_cmd(0x08 | displaycontrol);
break;
case TDISP_CTRL_MOVE:
switch (value) {
case cursorIncrease:
cursorcontrol |= TDISP_CURSOR_INC; // increase cursor position
break;
case cursorDecrease:
cursorcontrol &= ~TDISP_CURSOR_INC; // decrease cursor position
break;
}
write_cmd(0x04 | cursorcontrol);
break;
case TDISP_CTRL_SHIFT:
switch (value) {
case shiftOn:
cursorcontrol |= TDISP_SHIFT_ON;
break;
case shiftOff:
cursorcontrol &= ~TDISP_SHIFT_ON;
break;
}
write_cmd(0x04 | cursorcontrol);
break;
}
}
/* Scrolls the display in a particular direction with an amount of characters and delays the scroll between each scroll step */
void tdisp_lld_scroll(uint16_t direction, uint16_t amount, uint16_t delay) {
uint16_t scrollcontrol = 0;
uint16_t i;
switch (direction) {
case displayScrollLeft:
scrollcontrol = TDISP_SCROLL_DISPLAY;
break;
case displayScrollRight:
scrollcontrol = TDISP_SCROLL_DISPLAY | TDISP_SCROLL_RIGHT;
break;
}
for(i = 0; i < amount; i++) {
write_cmd(0x10 | scrollcontrol);
gfxSleepMilliseconds(delay);
}
}
#if TDISP_USE_BACKLIGHT
/* sets the brightness of the display backlight */
void tdisp_lld_set_backlight(uint16_t percentage) {
set_backlight(percentage);
}
#endif
#endif /* GFX_USE_TDISP */
/** @} */
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