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434 lines
8.6 KiB
434 lines
8.6 KiB
#include <stdbool.h>
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#include <stdint.h>
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#include <pico/stdlib.h>
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#include "lcd.h"
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#include "pinout.h"
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#define LCD_D7 PIN_LCD_D7
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#define LCD_D6 PIN_LCD_D6
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#define LCD_D5 PIN_LCD_D5
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#define LCD_D4 PIN_LCD_D4
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#define LCD_RS PIN_LCD_RS
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#define LCD_RW PIN_LCD_RW
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#define LCD_E PIN_LCD_E
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#define set_pin(num, val) gpio_put((num), (val))
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#define get_pin(num) gpio_get((num))
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#define pin_high(num) set_pin((num), 1)
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#define pin_low(num) set_pin((num), 0)
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#define get_bit(a, pos) (((a) >> (pos)) & 1)
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#define as_output(pin) gpio_set_dir((pin), 1)
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#define as_input_pu(pin) do { gpio_set_dir((pin), 0); gpio_pull_up((pin)); } while (0)
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#define _delay_ms(ms) sleep_ms((ms))
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#define _delay_us(us) sleep_us((us))
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#define _delay_ns(ns) sleep_us(1 + ((ns) / 1000)) // TODO
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// Start address of rows
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const uint8_t LCD_ROW_ADDR[] = {0x00, 0x40, 0x14, 0x54};
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// these are for the lcdbuf library
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#include "lcd/lcdbuf.h"
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/** Clear the entire screen (CGRAM can be left unchanged, but they will be written anew if needed) */
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void LcdBuffer_IO_Clear() {
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lcd_clear();
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}
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/** Write character data at position */
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void LcdBuffer_IO_WriteAt(lcdbuf_pos_t row, lcdbuf_pos_t col, const uint8_t *buf, lcdbuf_count_t len)
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{
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lcd_xy(col, row);
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lcd_putsn(buf, len);
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}
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/** Write CGRAM data. Data is always 8 bytes long. */
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void LcdBuffer_IO_WriteCGRAM(uint8_t position, const uint8_t* data)
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{
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lcd_glyph(position, data);
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}
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void LcdBuffer_IO_SetCursorPos(lcdbuf_pos_t cursor_row, lcdbuf_pos_t cursor_col)
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{
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lcd_xy(cursor_col, cursor_row);
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}
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void LcdBuffer_IO_SetCursorStyle(uint8_t cursor_style)
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{
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lcd_set_cursor(cursor_style & 0b11);
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}
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// Internal prototypes
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void _lcd_mode_r();
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void _lcd_mode_w();
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void _lcd_clk();
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void _lcd_wait_bf();
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void _lcd_write_byte(uint8_t bb);
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uint8_t _lcd_read_byte();
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void lcd_command(uint8_t bb);
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// Write utilities
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#define _lcd_write_low(bb) _lcd_write_nibble((bb) & 0x0F)
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#define _lcd_write_high(bb) _lcd_write_nibble(((bb) & 0xF0) >> 4)
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#define _lcd_write_nibble(nib) \
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gpio_put_masked((1 << PIN_LCD_D7) | (1 << PIN_LCD_D6) | (1 << PIN_LCD_D5) | (1 << PIN_LCD_D4), (nib) << PIN_LCD_D4)
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//#define _lcd_write_nibble(nib) do { \
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// set_pin(LCD_D7, get_bit((nib), 3)); \
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// set_pin(LCD_D6, get_bit((nib), 2)); \
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// set_pin(LCD_D5, get_bit((nib), 1)); \
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// set_pin(LCD_D4, get_bit((nib), 0)); \
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//} while(0)
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// --- Commands ---
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// Clear screen (reset)
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#define LCD_CLEAR 0b00000001
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// Move cursor to (0,0), unshift...
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#define LCD_HOME 0b00000010
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// Set mode: Increment + NoShift
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#define LCD_MODE_INC 0b00000110
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// Set mode: Increment + Shift
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#define LCD_MODE_INC_SHIFT 0b00000111
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// Set mode: Decrement + NoShift
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#define LCD_MODE_DEC 0b00000100
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// Set mode: Decrement + Shift
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#define LCD_MODE_DEC_SHIFT 0b00000101
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// Disable display (data remains untouched)
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#define LCD_DISABLE 0b00001000
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// Disable cursor
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#define LCD_CURSOR_NONE 0b00001100
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// Set cursor to still underscore
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#define LCD_CURSOR_BAR 0b00001110
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// Set cursor to blinking block
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#define LCD_CURSOR_BLINK 0b00001101
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// Set cursor to both of the above at once
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#define LCD_CURSOR_BOTH (LCD_CURSOR_BAR | LCD_CURSOR_BLINK)
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// Move cursor
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#define LCD_MOVE_LEFT 0b00010000
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#define LCD_MOVE_RIGHT 0b00010100
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// Shift display
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#define LCD_SHIFT_LEFT 0b00011000
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#define LCD_SHIFT_RIGHT 0b00011100
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// Set iface to 5x7 font, 1-line
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#define LCD_IFACE_4BIT_1LINE 0b00100000
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#define LCD_IFACE_8BIT_1LINE 0b00110000
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// Set iface to 5x7 font, 2-line
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#define LCD_IFACE_4BIT_2LINE 0b00101000
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#define LCD_IFACE_8BIT_2LINE 0b00111000
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// 0 W, 1 R
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static bool lcd_mode;
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static struct {
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uint8_t x;
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uint8_t y;
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} lcd_pos;
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static enum {
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TEXT = 0,
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CG = 1
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} lcd_addrtype;
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static uint8_t lcd_old_cursor = CURSOR_NONE;
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static bool lcd_enabled = false;
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/** Initialize the display */
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void lcd_init()
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{
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// configure pins as output
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as_output(LCD_E);
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as_output(LCD_RW);
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as_output(LCD_RS);
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lcd_mode = 1; // force data pins to output
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_lcd_mode_w();
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// Magic sequence to invoke Cthulhu (or enter 4-bit mode)
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_delay_ms(16);
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_lcd_write_nibble(0b0011);
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_lcd_clk();
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_delay_ms(5);
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_lcd_clk();
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_delay_ms(5);
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_lcd_clk();
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_delay_ms(5);
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_lcd_write_nibble(0b0010);
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_lcd_clk();
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_delay_us(100);
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// Configure the display
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lcd_command(LCD_IFACE_4BIT_2LINE);
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lcd_command(LCD_DISABLE);
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lcd_command(LCD_CLEAR);
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lcd_command(LCD_MODE_INC);
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// mark as enabled
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lcd_enable();
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lcd_pos.x = 0;
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lcd_pos.y = 0;
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lcd_addrtype = TEXT;
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}
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/** Send a pulse on the ENABLE line */
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void _lcd_clk()
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{
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pin_high(LCD_E);
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_delay_ns(450);
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pin_low(LCD_E);
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_delay_ns(450);
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}
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/** Enter READ mode */
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void _lcd_mode_r()
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{
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if (lcd_mode == 1) { return; } // already in R mode
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pin_high(LCD_RW);
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as_input_pu(LCD_D7);
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as_input_pu(LCD_D6);
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as_input_pu(LCD_D5);
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as_input_pu(LCD_D4);
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lcd_mode = 1;
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}
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/** Enter WRITE mode */
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void _lcd_mode_w()
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{
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if (lcd_mode == 0) { return; } // already in W mode
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pin_low(LCD_RW);
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as_output(LCD_D7);
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as_output(LCD_D6);
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as_output(LCD_D5);
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as_output(LCD_D4);
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lcd_mode = 0;
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}
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/** Read a byte */
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uint8_t _lcd_read_byte()
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{
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_lcd_mode_r();
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uint8_t res = 0;
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_lcd_clk();
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res = (get_pin(LCD_D7) << 7) | (get_pin(LCD_D6) << 6) | (get_pin(LCD_D5) << 5) | (get_pin(LCD_D4) << 4);
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_lcd_clk();
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res |= (get_pin(LCD_D7) << 3) | (get_pin(LCD_D6) << 2) | (get_pin(LCD_D5) << 1) | (get_pin(LCD_D4) << 0);
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return res;
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}
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/** Write an instruction byte */
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void lcd_command(uint8_t bb)
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{
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_lcd_wait_bf();
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pin_low(LCD_RS); // select instruction register
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_lcd_write_byte(bb); // send instruction byte
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}
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/** Write a data byte */
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void lcd_write(uint8_t bb)
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{
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if (lcd_addrtype == TEXT) {
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if (bb == '\r') {
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// CR
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lcd_pos.x = 0;
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lcd_xy(lcd_pos.x, lcd_pos.y);
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return;
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}
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if (bb == '\n') {
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// LF
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lcd_pos.y++;
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lcd_xy(lcd_pos.x, lcd_pos.y);
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return;
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}
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lcd_pos.x++;
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}
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_lcd_wait_bf();
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pin_high(LCD_RS); // select data register
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_lcd_write_byte(bb); // send data byte
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}
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/** Read BF & Address */
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uint8_t lcd_read_bf_addr()
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{
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pin_low(LCD_RS);
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return _lcd_read_byte();
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}
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/** Read CGRAM or DDRAM */
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uint8_t lcd_read()
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{
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if (lcd_addrtype == TEXT) { lcd_pos.x++; }
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pin_high(LCD_RS);
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return _lcd_read_byte();
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}
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/** Write a byte using the 4-bit interface */
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void _lcd_write_byte(uint8_t bb)
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{
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_lcd_mode_w(); // enter W mode
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_lcd_write_high(bb);
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_lcd_clk();
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_lcd_write_low(bb);
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_lcd_clk();
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}
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/** Wait until the device is ready */
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void _lcd_wait_bf()
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{
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uint8_t d = 0;
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while (d++ < 200 && lcd_read_bf_addr() & (1 << 7))
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_delay_us(1);
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}
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/** Send a string to LCD */
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void lcd_puts(const char *str_p)
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{
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char c;
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while ((c = *str_p++)) {
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lcd_putc(c);
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}
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}
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/** Send a string to LCD, N characters long */
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void lcd_putsn(const char *str_p, size_t len)
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{
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while(len--) {
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lcd_putc(*str_p++);
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}
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}
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/** Sedn a char to LCD */
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void lcd_putc(const char c)
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{
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lcd_write(c);
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}
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/** Set cursor position */
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void lcd_xy(const uint8_t x, const uint8_t y)
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{
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lcd_pos.x = x;
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lcd_pos.y = y;
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lcd_addr(LCD_ROW_ADDR[y] + (x));
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}
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/** Set LCD cursor. If not enabled, only remember it. */
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void lcd_set_cursor(uint8_t type)
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{
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lcd_old_cursor = (type & CURSOR_BOTH);
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if (lcd_enabled) { lcd_command(LCD_CURSOR_NONE | lcd_old_cursor); }
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}
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/** Display display (preserving cursor) */
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void lcd_disable()
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{
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lcd_command(LCD_DISABLE);
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lcd_enabled = false;
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}
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/** Enable display (restoring cursor) */
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void lcd_enable()
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{
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lcd_enabled = true;
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lcd_set_cursor(lcd_old_cursor);
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}
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/** Go home */
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void lcd_home()
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{
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lcd_command(LCD_HOME);
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lcd_pos.x = 0;
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lcd_pos.y = 0;
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lcd_addrtype = TEXT;
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}
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/** Clear the screen */
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void lcd_clear()
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{
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lcd_command(LCD_CLEAR);
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lcd_pos.x = 0;
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lcd_pos.y = 0;
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lcd_addrtype = TEXT;
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_delay_ms(1); // it tends to lose the first character otherwise!
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}
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/** Define a glyph */
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void lcd_glyph(const uint8_t index, const uint8_t *array)
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{
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lcd_addr_cg(index * 8);
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for (uint8_t i = 0; i < 8; ++i) {
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lcd_write(array[i]);
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}
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// restore previous position
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lcd_xy(lcd_pos.x, lcd_pos.y);
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lcd_addrtype = TEXT;
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}
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/** Set address in CGRAM */
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void lcd_addr_cg(const uint8_t acg)
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{
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lcd_addrtype = CG;
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lcd_command(0b01000000 | ((acg) & 0b00111111));
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}
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/** Set address in DDRAM */
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void lcd_addr(const uint8_t add)
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{
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lcd_addrtype = TEXT;
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lcd_command(0b10000000 | ((add) & 0b01111111));
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}
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