122 lines
2.6 KiB
C
122 lines
2.6 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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/**
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TODO list:
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- Implement display_set_cursor().
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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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Queue up a clear screen command. Cheap operation on this display.
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*/
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void display_clear(void) {
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display_writechar((uint8_t)low_code_clear);
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}
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/**
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Sets the cursor to the given position.
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\param line The vertical cursor position to set, in lines. First line is
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zero. Line height is character height, which is currently
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fixed to 8 pixels.
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\param column The horizontal cursor position to set, in pixels. First
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column is zero.
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Use this for debugging purposes, only. Regular display updates happen in
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display_clock().
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*/
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void display_set_cursor(uint8_t line, uint8_t column) {
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// Currently unimplemented.
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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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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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/**
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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;
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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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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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