kopia lustrzana https://github.com/ArjanteMarvelde/uSDR-pico
125 wiersze
2.9 KiB
C
125 wiersze
2.9 KiB
C
/*
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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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*
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*/
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#include <stdio.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
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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_ENTRYRIGHT 0x00
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#define LCD_ENTRYLEFT 0x02
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#define LCD_ENTRYSHIFTINC 0x01
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#define LCD_ENTRYSHIFTDEC 0x00
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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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/* I2C address and pins */
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#define I2C_LCD 0x3E
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#define I2C0_SDA 8
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#define I2C0_SCL 9
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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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txdata[0] = 0x80;
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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(39);
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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(39);
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}
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void lcd_ctrl(uint8_t cmd, uint8_t x, uint8_t y)
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{
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uint8_t txdata[8];
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txdata[0] = 0x80;
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switch(cmd)
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{
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case LCD_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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break;
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case LCD_HOME:
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txdata[1] = LCD_RETURNHOME;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(39);
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break;
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case LCD_GOTO: // 2-row is 0x00-0x27 per row, only 0x00-0x1F are visible
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if (y==1)
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txdata[1] = x | 0xc0;
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else
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txdata[1] = x | 0x80;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(39);
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break;
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}
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}
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void lcd_write(uint8_t *s, uint8_t len)
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{
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uint8_t i;
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uint8_t *p;
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uint8_t txdata[8];
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txdata[0] = 0x40;
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p=s;
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for (i=0; i<len; i++)
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{
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txdata[1] = *p++;
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i2c_write_blocking(i2c0, I2C_LCD, txdata, 2, false);
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sleep_us(43);
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}
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} |