kopia lustrzana https://github.com/ArjanteMarvelde/uSDR-pico
Update lcd.c
ArjanteMarvelde
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lcd.c
215
lcd.c
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@ -4,29 +4,20 @@
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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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* Select LCD_TYPE:
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*
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* Grove 16x2 LCD HD44780, with integrated JHD1804 I2C bridge (@ 0x3E)
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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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* Available character Generator addresses are 0x00-0x07
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*
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* Standard 16x2 LCD HD44780, with backpack PCF8574 based I2C bridge (@ 0x27)
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* Same registers, but interface uses 4 bits for data/comand, in bits 3..7
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* bit 0 is unused
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* bit 1 is Register Select (0 for command, 1 for data)
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* bit 2 is Enable, data/command is transferred on falling edge
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* bit 3..6 data or command nibble (write high nibble first)
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* bit 8 is backlight (1 for on)
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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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@ -36,10 +27,16 @@
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#include "hardware/clocks.h"
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#include "lcd.h"
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/* Select LCD type matching your HW */
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#define LCD_1804 0
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#define LCD_8574 1
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#define LCD_TYPE LCD_1804
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/* I2C address */
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#define I2C_LCD 0x3E
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//#define I2C_LCD 0x27
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/* HD44780 interface */
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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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@ -78,17 +75,20 @@
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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_DELAY 100 // Delay for regular write
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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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/* 8574-based specific bitmasks */
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#define LCD2_BACKLIGHT 0x80
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#define LCD2_DATA 0x02
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#define LCD2_ENABLE 0x04
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/*
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* User defined characters
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* User defined (CGRAM) characters
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*/
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uint8_t cgram[8][8] = // Write CGRAM
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uint8_t cgram[8][8] =
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{
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{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // 0x00: blank
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{0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x00, 0x00}, // 0x01: Level 1
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@ -100,133 +100,129 @@ uint8_t cgram[8][8] = // Write CGRAM
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{0x04, 0x0e, 0x1f, 0x04, 0x04, 0x04, 0x00, 0x00} // 0x07: Transmit arrow up
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};
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/*
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* Transfer 1 byte to LCD
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* This function is interface dependent
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*/
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void lcd_sendbyte(uint8_t command, uint8_t data)
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{
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#if LCD_TYPE == LCD_1804
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uint8_t txdata[2];
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// Write command/data flag and data byte
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txdata[0] = (command?LCD_COMMAND:LCD_DATA);
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txdata[1] = data;
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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#elif LCD_TYPE == LCD_8574
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uint8_t txdata;
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// Write high nibble
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txdata = (command?0:LCD2_DATA)|LCD2_ENABLE|((data&0xf0)<<1)|LCD2_BACKLIGHT;
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i2c_write_blocking(i2c1, I2C_LCD, &txdata[0], 1, false);
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sleep_us(LCD_DELAY);
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tx_data &= ~LCD2_ENABLE;
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i2c_write_blocking(i2c1, I2C_LCD, &txdata[0], 1, false);
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sleep_us(LCD_DELAY);
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tx_data |= LCD2_ENABLE;
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sleep_us(LCD_DELAY);
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// Write low nibble
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txdata = (command?0:LCD2_DATA)|LCD2_ENABLE|((data&0xf0)>>3)|LCD2_BACKLIGHT;
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i2c_write_blocking(i2c1, I2C_LCD, &txdata[0], 1, false);
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sleep_us(LCD_DELAY);
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tx_data &= ~LCD2_ENABLE;
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i2c_write_blocking(i2c1, I2C_LCD, &txdata[0], 1, false);
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sleep_us(LCD_DELAY);
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tx_data |= LCD2_ENABLE;
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sleep_us(LCD_DELAY);
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#endif
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}
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void lcd_init(void)
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{
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uint8_t txdata[10];
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uint8_t i;
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sleep_ms(50);
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txdata[0] = LCD_COMMAND;
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sleep_ms(100);
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#if LCD_TYPE == LCD_1804
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/* Initialize function set (see datasheet fig 23)*/
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txdata[0] = LCD_COMMAND;
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txdata[1] = LCD_FUNCTIONSET | LCD_8BITMODE | LCD_2LINE | LCD_5x8DOTS;
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 2, false);
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lcd_sendbyte(true, LCD_FUNCTIONSET | LCD_8BITMODE | LCD_2LINE | LCD_5x8DOTS);
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sleep_us(4500);
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(100);
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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lcd_sendbyte(true, LCD_FUNCTIONSET | LCD_8BITMODE | LCD_2LINE | LCD_5x8DOTS);
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lcd_sendbyte(true, LCD_FUNCTIONSET | LCD_8BITMODE | LCD_2LINE | LCD_5x8DOTS);
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lcd_sendbyte(true, LCD_FUNCTIONSET | LCD_8BITMODE | LCD_2LINE | LCD_5x8DOTS);
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#elif LCD_TYPE == LCD_8574
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lcd_sendbyte(true, LCD_FUNCTIONSET | LCD_4BITMODE | LCD_2LINE | LCD_5x8DOTS);
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sleep_us(4500);
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lcd_sendbyte(true, LCD_FUNCTIONSET | LCD_4BITMODE | LCD_2LINE | LCD_5x8DOTS);
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lcd_sendbyte(true, LCD_FUNCTIONSET | LCD_4BITMODE | LCD_2LINE | LCD_5x8DOTS);
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lcd_sendbyte(true, LCD_FUNCTIONSET | LCD_4BITMODE | LCD_2LINE | LCD_5x8DOTS);
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#endif
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/* Initialize display control */
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txdata[0] = LCD_COMMAND;
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txdata[1] = LCD_DISPLAYCONTROL | LCD_DISPLAYOFF | LCD_CURSOROFF | LCD_BLINKOFF;
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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lcd_sendbyte(true, LCD_DISPLAYCONTROL | LCD_DISPLAYOFF | LCD_CURSOROFF | LCD_BLINKOFF);
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/* Display clear */
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txdata[0] = LCD_COMMAND;
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txdata[1] = LCD_CLEARDISPLAY;
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(1530);
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lcd_sendbyte(true, LCD_CLEARDISPLAY);
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sleep_ms(2);
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/* Initialize entry mode set */
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txdata[0] = LCD_COMMAND;
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txdata[1] = LCD_ENTRYMODESET | LCD_ENTRYINC | LCD_ENTRYNOSHIFT;
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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lcd_sendbyte(true, LCD_ENTRYMODESET | LCD_ENTRYINC | LCD_ENTRYNOSHIFT);
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/* Load CGRAM */
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for (i=0; i<8; i++)
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{
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txdata[0] = LCD_COMMAND;
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txdata[1] = LCD_SETCGRAMADDR | (i<<3); //Set CGRAM address
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i2c_write_blocking(i2c1, 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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for (int j=0; j<8; j++) txdata[1+j] = cgram[i][j];
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 9, false);
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sleep_us(LCD_DELAY);
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lcd_sendbyte(true, LCD_SETCGRAMADDR | (i<<3)); //Set CGRAM address
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for (int j=0; j<8; j++)
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lcd_sendbyte(false, cgram[i][j]); // One byte at a time
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}
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/* Initialize display control */
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txdata[0] = LCD_COMMAND;
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txdata[1] = LCD_DISPLAYCONTROL | LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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lcd_sendbyte(true, LCD_DISPLAYCONTROL | LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF);
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/* Display clear once more */
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txdata[0] = LCD_COMMAND;
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txdata[1] = LCD_CLEARDISPLAY;
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i2c_write_blocking(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(1530);
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lcd_sendbyte(true, LCD_CLEARDISPLAY);
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sleep_ms(2);
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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(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(1530);
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lcd_sendbyte(true, LCD_CLEARDISPLAY);
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sleep_ms(2);
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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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x &= 0x0f; // Clip range
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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(i2c1, 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(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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lcd_sendbyte(true, (x | 0x80 | (y==1?0x40:0x00)));
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lcd_sendbyte(true, LCD_DISPLAYCONTROL | LCD_DISPLAYON | (on?LCD_CURSORON:LCD_CURSOROFF) | LCD_BLINKOFF);
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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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x &= 0x0f; // Clip range
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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(i2c1, 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(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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lcd_sendbyte(true, (x | 0x80 | (y==1?0x40:0x00)));
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lcd_sendbyte(false, c);
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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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x &= 0x0f; // Clip range
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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(i2c1, I2C_LCD, txdata, 2, false);
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sleep_us(LCD_DELAY);
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lcd_sendbyte(true, (x | 0x80 | (y==1?0x40:0x00)));
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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(i2c1, I2C_LCD, txdata, len+1, false);
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sleep_us(LCD_DELAY);
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len = (len>(16-x))?(16-x):len; // Clip range
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for(i=0; i<len; i++)
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lcd_sendbyte(false, s[i]);
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}
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@ -239,7 +235,8 @@ void lcd_test(void)
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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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for(j=0; j<16; j++)
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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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