131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
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/** \file
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\brief Code specific to the HD44780 display.
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*/
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#include "display.h"
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#if defined TEACUP_C_INCLUDE && defined DISPLAY_TYPE_HD44780
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#include "displaybus.h"
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#include "delay.h"
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#include "sendf.h"
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#include "dda.h"
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/**
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* Initializes the display's controller configuring the way of
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* displaying data.
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*/
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void display_init(void) {
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// Minimum initialisation time after power up.
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delay_ms(15);
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displaybus_init(0);
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// Write left to right, no display shifting.
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displaybus_write(0x06, parallel_4bit_instruction);
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// Display ON, cursor not blinking.
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displaybus_write(0x0C, parallel_4bit_instruction);
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}
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/**
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Show a nice greeting. Pure eye candy.
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*/
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void display_greeting(void) {
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display_clear();
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// We have only 16 characters at our disposal ...
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display_writestr_P(PSTR("Welcome @ Teacup"));
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// Forward this to the display immediately.
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while (buf_canread(display)) {
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display_tick();
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}
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// Allow the user to worship our work for a moment :-)
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delay_ms(5000);
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}
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/**
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Regular update of the display. Typically called once a second from clock.c.
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*/
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void display_clock(void) {
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static uint8_t pos = 0;
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display_clear();
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update_current_position();
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sendf_P(display_writechar, PSTR("X:%lq Y:%lq"),
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current_position.axis[X], current_position.axis[Y]);
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/**
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This is a tiny demo showing how cursor positioning works. The
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four-character text should move along the second display line.
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*/
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display_set_cursor(1, pos);
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display_writestr_P(PSTR("ick!"));
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pos++;
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if (pos >= DISPLAY_SYMBOLS_PER_LINE) {
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pos = 0;
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}
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}
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/**
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Forwards a character or a control command from the display queue to display
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bus. As this is a character based display it's easy.
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*/
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void display_tick() {
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uint8_t data, command;
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if (displaybus_busy()) {
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return;
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}
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if (buf_canread(display)) {
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buf_pop(display, data);
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switch (data) {
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case low_code_clear:
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displaybus_write(0x01, parallel_4bit_instruction);
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break;
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case low_code_set_cursor:
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/**
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Set the cursor to the given position.
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This is a three-byte control command, so we fetch additional bytes
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from the queue and cross fingers they're actually there.
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*/
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command = 0x80; // "Set DDRAM Address" base command.
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/**
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Add address of line.
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As we have two lines only, this can be "calculated" without
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a multiplication.
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*/
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buf_pop(display, data);
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if (data) {
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command += 0x40;
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}
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// Add column address.
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buf_pop(display, data);
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command += data;
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displaybus_write(command, parallel_4bit_instruction);
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break;
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default:
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// Should be a printable character.
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displaybus_write(data, parallel_4bit_data);
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break;
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}
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}
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}
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#endif /* TEACUP_C_INCLUDE && DISPLAY_TYPE_HD44780 */
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