kopia lustrzana https://github.com/ArjanteMarvelde/uSDR-pico
ArjanteMarvelde
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bf8a944875
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lcd.c
128
lcd.c
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@ -4,20 +4,35 @@
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* Created: Mar 2021
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* Author: Arjan te Marvelde
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*
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* Select LCD_TYPE:
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* --> Set I2C address below!
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* --> Select LCD_TYPE below!
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*
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* LCD_1804:
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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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* Available character Generator addresses are 0x00-0x07
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* 2 byte interface,
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* byte0 contains coomand/data,
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* byte1 contains 8-bit command or data word
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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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* LCD_8574_ADA:
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* Standard 16x2 LCD HD44780, with PCF8574 based Adafruit backpack I2C bridge (@ 0x27)
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* Same registers, but interface uses 4-bit transfers for data/comand, in bits 3..6
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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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* bit 7 is backlight (1 for on)
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*
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* LCD_8574_GEN:
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* Standard 16x2 LCD HD44780, with PCF8574 based Generic backpack I2C bridge (@ 0x27)
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* Same registers, but interface uses 4-bit transfers for data/comand, in bits 4..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 is backlight (1 for on)
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* bit 4..7 data or command nibble (write high nibble first)
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*
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* Note: There may be other bit-mappings, code needs to be adjusted to that...
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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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@ -27,16 +42,19 @@
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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_8574
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/** User selectable definitions **/
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// Set I2C address
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#define I2C_LCD 0x27
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//#define I2C_LCD 0x3E
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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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// Select LCD type matching your HW
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#define LCD_1804 0 // Seeed / Grove
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#define LCD_8574_ADA 1 // Adafruit I2C backpack
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#define LCD_8574_GEN 2 // Generic I2C backpack
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#define LCD_TYPE LCD_8574_GEN
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/* HD44780 interface */
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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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@ -75,18 +93,40 @@
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#define LCD_5x10DOTS 0x04
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#define LCD_5x8DOTS 0x00
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#define LCD_DELAY 100 // Delay for regular write
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/** I2C interface specific mappings **/
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// 1804-based specific bitmasks
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#define LCD_COMMAND 0x80
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#define LCD_DATA 0x40
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#define LCD_INIT_1804 (LCD_FUNCTIONSET | LCD_8BITMODE | LCD_2LINE | LCD_5x8DOTS)
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// 8574-based specific bitmasks
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#define LCD_COMMAND_BIT 0x00
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#define LCD_DATA_BIT 0x02
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#define LCD_ENABLE_BIT 0x04
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#define LCD_BACKLIGHT_ADA 0x80
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#define LCD_BACKLIGHT_GEN 0x08
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#define LCD_INIT_ADA (LCD_FUNCTIONSET | LCD_4BITMODE | LCD_2LINE | LCD_5x8DOTS)
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#define LCD_INIT_GEN (LCD_FUNCTIONSET | LCD_4BITMODE | LCD_2LINE | LCD_5x8DOTS)
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#if (LCD_TYPE == LCD_1804)
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#define LCD_INIT_FUNCTION LCD_INIT_1804
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#elif (LCD_TYPE == LCD_8574_ADA)
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#define LCD_INIT_FUNCTION LCD_INIT_ADA
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#elif (LCD_TYPE == LCD_8574_GEN)
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#define LCD_INIT_FUNCTION LCD_INIT_GEN
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#endif
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/** Other definitions **/
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#define LCD_DELAY 100 // Delay for regular write
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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 (CGRAM) characters
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* Display RAM addresses 0x00-0x1f for top row and 0x40-0x5f for bottom row
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* Available character Generator addresses are 0x00-0x07
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*/
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uint8_t cgram[8][8] =
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{
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@ -102,36 +142,50 @@ uint8_t cgram[8][8] =
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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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* --> 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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#endif
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#elif LCD_TYPE == LCD_8574
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#if LCD_TYPE == LCD_8574_ADA
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uint8_t high, low;
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high = (command?0:LCD2_DATA)|LCD2_ENABLE|((data&0xf0)>>1)|LCD2_BACKLIGHT;
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low = (command?0:LCD2_DATA)|LCD2_ENABLE|((data&0x0f)<<3)|LCD2_BACKLIGHT;
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high = (command?LCD_COMMAND_BIT:LCD_DATA_BIT)|LCD_ENABLE_BIT|((data>>1)&0x78))|LCD_BACKLIGHT_ADA;
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low = (command?LCD_COMMAND_BIT:LCD_DATA_BIT)|LCD_ENABLE_BIT|((data<<3)&0x78)<<3)|LCD_BACKLIGHT_ADA;
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// Write high nibble
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i2c_write_blocking(i2c1, I2C_LCD, &high, 1, false); sleep_us(LCD_DELAY);
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high &= ~LCD2_ENABLE;
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high &= ~LCD_ENABLE_BIT;
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i2c_write_blocking(i2c1, I2C_LCD, &high, 1, false); sleep_us(LCD_DELAY);
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// Write low nibble
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i2c_write_blocking(i2c1, I2C_LCD, &low, 1, false); sleep_us(LCD_DELAY);
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low &= ~LCD2_ENABLE;
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low &= ~LCD_ENABLE_BIT;
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i2c_write_blocking(i2c1, I2C_LCD, &low, 1, false); sleep_us(LCD_DELAY);
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#endif
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#if LCD_TYPE == LCD_8574_GEN
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uint8_t high, low;
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high = (command?LCD_COMMAND_BIT:LCD_DATA_BIT)|LCD_ENABLE_BIT|((data )&0xf0)|LCD_BACKLIGHT_GEN;
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low = (command?LCD_COMMAND_BIT:LCD_DATA_BIT)|LCD_ENABLE_BIT|((data<<4)&0xf0)|LCD_BACKLIGHT_GEN;
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// Write high nibble
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i2c_write_blocking(i2c1, I2C_LCD, &high, 1, false); sleep_us(LCD_DELAY);
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high &= ~LCD_ENABLE_BIT;
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i2c_write_blocking(i2c1, I2C_LCD, &high, 1, false); sleep_us(LCD_DELAY);
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// Write low nibble
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i2c_write_blocking(i2c1, I2C_LCD, &low, 1, false); sleep_us(LCD_DELAY);
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low &= ~LCD_ENABLE_BIT;
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i2c_write_blocking(i2c1, I2C_LCD, &low, 1, false); sleep_us(LCD_DELAY);
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#endif
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}
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@ -141,20 +195,12 @@ void lcd_init(void)
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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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lcd_sendbyte(true, LCD_FUNCTIONSET | LCD_8BITMODE | LCD_2LINE | LCD_5x8DOTS);
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/* Initialize function set */
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lcd_sendbyte(true, LCD_INIT_FUNCTION);
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sleep_us(4500);
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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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lcd_sendbyte(true, LCD_INIT_FUNCTION);
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lcd_sendbyte(true, LCD_INIT_FUNCTION);
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lcd_sendbyte(true, LCD_INIT_FUNCTION);
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/* Initialize display control */
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lcd_sendbyte(true, LCD_DISPLAYCONTROL | LCD_DISPLAYOFF | LCD_CURSOROFF | LCD_BLINKOFF);
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