kopia lustrzana https://github.com/ArjanteMarvelde/uSDR-pico
243 wiersze
6.2 KiB
C
243 wiersze
6.2 KiB
C
/*
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* lcd.c
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*
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* Created: Mar 2021
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* Author: Arjan te Marvelde
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*
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* Grove 16x2 LCD, HD44780 chip with JHD1804 I2C interface
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* Display RAM addresses 0x00-0x1f for top row and 0x40-0x5f for bottom row
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* Character Generator addresses are 0x00-0x07
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*
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* Character 0x00:
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* +-+-+-+-+-+
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* 000000 | |1| | | |
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* +-+-+-+-+-+
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* 000001 |1| | | | |
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* +-+-+-+-+-+
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* 000010 | |1| | | |
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* +-+-+-+-+-+
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* 000011 |1| | | | |
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* +-+-+-+-+-+
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* 000100 | |1| | | |
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* +-+-+-+-+-+
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* 000101 |1| | | | |
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* +-+-+-+-+-+
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* 000110 | |1| | | |
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* +-+-+-+-+-+
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* 000111 | | | | | | <= do not use, cursor
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* +-+-+-+-+-+
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include "pico/stdlib.h"
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#include "hardware/i2c.h"
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#include "hardware/timer.h"
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#include "hardware/clocks.h"
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#include "lcd.h"
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// commands
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#define LCD_CLEARDISPLAY 0x01 // Note: LCD_ENTRYINC is set
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#define LCD_RETURNHOME 0x02
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#define LCD_ENTRYMODESET 0x04
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#define LCD_DISPLAYCONTROL 0x08
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#define LCD_CURSORSHIFT 0x10
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#define LCD_FUNCTIONSET 0x20
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#define LCD_SETCGRAMADDR 0x40
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#define LCD_SETDDRAMADDR 0x80
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// flags for display entry mode: LCD_ENTRYMODESET
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#define LCD_ENTRYSHIFT 0x01
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#define LCD_ENTRYNOSHIFT 0x00
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#define LCD_ENTRYINC 0x02 // Also applies to CGRAM writes
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#define LCD_ENTRYDEC 0x00 // Also applies to CGRAM writes
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// flags for display on/off control: LCD_DISPLAYCONTROL
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#define LCD_DISPLAYON 0x04
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#define LCD_DISPLAYOFF 0x00
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#define LCD_CURSORON 0x02
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#define LCD_CURSOROFF 0x00
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#define LCD_BLINKON 0x01
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#define LCD_BLINKOFF 0x00
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// flags for display/cursor shift: LCD_CURSORSHIFT
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#define LCD_DISPLAYMOVE 0x08
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#define LCD_CURSORMOVE 0x00
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#define LCD_MOVERIGHT 0x04
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#define LCD_MOVELEFT 0x00
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// flags for function set: LCD_FUNCTIONSET
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#define LCD_8BITMODE 0x10
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#define LCD_4BITMODE 0x00
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#define LCD_2LINE 0x08
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#define LCD_1LINE 0x00
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#define LCD_5x10DOTS 0x04
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#define LCD_5x8DOTS 0x00
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#define LCD_DELAY 100
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#define LCD_COMMAND 0x80
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#define LCD_DATA 0x40
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/* I2C address and pins */
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#define I2C_LCD 0x3E
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#define I2C0_SDA 16
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#define I2C0_SCL 17
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uint8_t cgram[65] = // Write CGRAM
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{ // 8x8 bytes
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0x80,
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0x08, 0x10, 0x08, 0x10, 0x08, 0x10, 0x08, 0x00,
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0x08, 0x10, 0x08, 0x10, 0x08, 0x10, 0x0b, 0x00,
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0x08, 0x10, 0x08, 0x10, 0x08, 0x13, 0x0b, 0x00,
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0x08, 0x10, 0x08, 0x10, 0x0b, 0x13, 0x0b, 0x00,
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0x08, 0x10, 0x08, 0x13, 0x0b, 0x13, 0x0b, 0x00,
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0x08, 0x10, 0x0b, 0x13, 0x0b, 0x13, 0x0b, 0x00,
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0x08, 0x13, 0x0b, 0x13, 0x0b, 0x13, 0x0b, 0x00,
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0x0b, 0x13, 0x0b, 0x13, 0x0b, 0x13, 0x0b, 0x00
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};
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void lcd_init(void)
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{
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uint8_t txdata[8];
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/* I2C0 initialisation at 400Khz. */
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i2c_init(i2c0, 400*1000);
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gpio_set_function(I2C0_SDA, GPIO_FUNC_I2C);
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gpio_set_function(I2C0_SCL, GPIO_FUNC_I2C);
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gpio_pull_up(I2C0_SDA);
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gpio_pull_up(I2C0_SCL);
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sleep_ms(50);
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txdata[0] = LCD_COMMAND;
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/* Initialize function set (see datasheet fig 23)*/
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txdata[1] = LCD_FUNCTIONSET | LCD_8BITMODE | LCD_2LINE | LCD_5x8DOTS;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(4500);
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(100);
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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/* Initialize display control */
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txdata[1] = LCD_DISPLAYCONTROL | LCD_DISPLAYOFF | LCD_CURSOROFF | LCD_BLINKOFF;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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/* Display clear */
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txdata[1] = LCD_CLEARDISPLAY;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(1530);
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/* Initialize entry mode set */
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txdata[1] = LCD_ENTRYMODESET | LCD_ENTRYINC | LCD_ENTRYNOSHIFT;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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/* Load CGRAM */
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txdata[1] = 0x40; //Set CGRAM address 0
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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i2c_write_blocking(i2c0, I2C_LCD, cgram, 65, false);
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sleep_us(LCD_DELAY);
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/* Initialize display control */
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txdata[1] = LCD_DISPLAYCONTROL | LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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/* Display clear once more */
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txdata[1] = LCD_CLEARDISPLAY;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(1530);
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}
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void lcd_clear(void)
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{
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uint8_t txdata[3];
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txdata[0] = LCD_COMMAND;
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txdata[1] = LCD_CLEARDISPLAY;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(1530);
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}
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void lcd_curxy(uint8_t x, uint8_t y, bool on)
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{
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uint8_t txdata[3];
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x &= 0x0f;
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y &= 0x01;
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txdata[0] = LCD_COMMAND;
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txdata[1] = x | 0x80 | (y==1?0x40:0x00);
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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txdata[0] = LCD_COMMAND;
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txdata[1] = LCD_DISPLAYCONTROL | LCD_DISPLAYON | (on?LCD_CURSORON:LCD_CURSOROFF) | LCD_BLINKOFF;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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}
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void lcd_putxy(uint8_t x, uint8_t y, uint8_t c)
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{
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uint8_t txdata[3];
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x &= 0x0f;
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y &= 0x01;
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txdata[0] = LCD_COMMAND;
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txdata[1] = x | 0x80 | (y==1?0x40:0x00);
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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txdata[0] = LCD_DATA;
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txdata[1] = c;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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}
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void lcd_writexy(uint8_t x, uint8_t y, uint8_t *s)
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{
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uint8_t i, len;
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uint8_t txdata[18];
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x &= 0x0f;
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y &= 0x01;
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txdata[0] = LCD_COMMAND;
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txdata[1] = x | 0x80 | ((y==1)?0x40:0x00);
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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len = strlen(s);
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len = (len>(16-x))?(16-x):len;
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txdata[0] = LCD_DATA;
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for(i=0; i<len; i++) txdata[i+1]=s[i];
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i2c_write_blocking(i2c0, I2C_LCD, txdata, len+1, false);
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sleep_us(LCD_DELAY);
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}
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void lcd_test(void)
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{
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uint8_t chr[17];
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int i, j;
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chr[16] = 0;
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lcd_clear();
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for (i=0; i<16; i++)
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{
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for(j=0; j<16; j++) chr[j] = (uint8_t)(16*i+j);
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lcd_writexy(0, 0, chr);
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sleep_ms(800);
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lcd_writexy(0, 1, chr);
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}
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lcd_clear();
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} |