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/*
* This source code form is a part of the ChibiOS/GFX project and stands
* under the terms of the GFX License v1.0. 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 "ch.h"
#include "hal.h"
#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
/* The user may override the default display size */
#ifndef TDISP_COLUMNS
#define TDISP_COLUMNS 16
#endif
#ifndef TDISP_ROWS
#define TDISP_ROWS 2
#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 */
};
/* Our display control */
#define TDISP_DISPLAY_ON 0x04
#define TDISP_CURSOR_ON 0x02
#define TDISP_CURSOR_BLINK 0x01
static uint8_t displaycontrol;
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 */
chThdSleepMilliseconds(15);
/* write three times 0x03 to display
* with RS = low.
*/
palClearPad(PORT_CTRL, PIN_RS);
#if BUS_4BITS
writeToLCD(0x03); // 1x
writeToLCD(0x03); // 2x
writeToLCD(0x03); // 3x
/* Put display in 4-bit mode by
* write 0x02 to display.
*/
writeToLCD(0x02); // 4bit-modus
#else
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.
*/
/* 4-bit modus, 2 lines en 5x7 characters */
write_cmd(0x28);
displaycontrol = TDISP_DISPLAY_ON;
/* set display on, cursor off and no blinking */
write_cmd(0x0C);
/* set cursor move direction */
write_cmd(0x06);
/* END OF INITIALISATION */
// /* wait some time */
// chThdSleepMilliseconds(50);
//
// write_cmd(0x38);
// chThdSleepMilliseconds(64);
//
// displaycontrol = DISPLAY_ON | CURSOR_ON | CURSOR_BLINK; // The default displaycontrol
// write_cmd(0x08 | displaycontrol);
// chThdSleepMicroseconds(50);
//
// write_cmd(0x01); // Clear the screen
// chThdSleepMilliseconds(5);
//
// write_cmd(0x06);
// chThdSleepMicroseconds(50);
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);
// chThdSleepMilliseconds(LONG_DELAY_MS);
}
void tdisp_lld_draw_char(char c) {
write_data(c);
}
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]));
}
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]);
}
}
void tdisp_lld_control(uint16_t what, uint16_t value) {
switch(what) {
case TDISP_CTRL_BACKLIGHT:
if ((uint8_t)value)
displaycontrol |= DISPLAY_ON;
else
displaycontrol &= ~DISPLAY_ON;
write_cmd(0x08 | displaycontrol);
break;
case TDISP_CTRL_CURSOR:
switch((uint8_t)value) {
case cursorOff:
displaycontrol &= ~CURSOR_ON;
break;
case cursorBlock:
case cursorUnderline:
case cursorBar:
displaycontrol = (displaycontrol | CURSOR_ON) & ~CURSOR_BLINK;
break;
case cursorBlinkingBlock:
case cursorBlinkingUnderline:
case cursorBlinkingBar:
default:
displaycontrol |= (CURSOR_ON | CURSOR_BLINK);
break;
}
write_cmd(0x08 | displaycontrol);
break;
}
}
#endif /* GFX_USE_TDISP */
/** @} */
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