example for #2191
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kraus
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/*
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I2CLCDBoard.ino
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
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Copyright (c) 2023, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Arduino.h>
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#include <U8g2lib.h>
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#include <Wire.h>
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/*
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Example for the I2C GFX Board https://github.com/olikraus/u8g2/issues/2191
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Control Signal List for I2C Port Expander @0x3e:
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Bit 0: C/D
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Bit 1: R/W
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Bit 2: E
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Bit 3: E2
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Bit 4: /CS
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Bit 5: /RD
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Bit 6: /Reset
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Bit 7: LED
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*/
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#define I2C_LCD_CD 1
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#define I2C_LCD_RW 2
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#define I2C_LCD_E 4
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#define I2C_LCD_E2 8
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#define I2C_LCD_CS 16
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#define I2C_LCD_RD 32
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#define I2C_LCD_RESET 64
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#define I2C_LCD_LED 128
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/* default value for the LED control gpio line */
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#define I2C_LCD_LED_DEFAULT I2C_LCD_LED
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#define I2C_LCD_CTRL_ADR 0x3e
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#define I2C_LCD_DATA_ADR 0x3f
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/*
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set a bit in the internal register and in the i2c control gpio
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only update operation will be u8x8_set_ctrl_bit(u8x8, 0, 1);
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typically the second argument will be one of the I2C_LCD_xxx macros
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reusing the i2c_started member, which is not used by the i2c lcd board software (i2c_started is only used by sw emulated i2c)
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*/
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void u8x8_set_ctrl_bit(u8x8_t *u8x8, uint8_t bit, uint8_t is_set) U8X8_NOINLINE;
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void u8x8_set_ctrl_bit(u8x8_t *u8x8, uint8_t bit, uint8_t is_set)
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{
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if ( is_set )
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u8x8->i2c_started |= (uint8_t)bit; // reused i2c_started to store the gpio state
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else
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u8x8->i2c_started &= ~(uint8_t)bit; // reused i2c_started to store the gpio state
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Wire.beginTransmission(I2C_LCD_CTRL_ADR);
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Wire.write(u8x8->i2c_started); // Sends value byte
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Wire.endTransmission(); // Stop transmitting
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}
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/*
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The new gpio&delay procedure extents the existing arduino procedure and adds proper reset handling
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*/
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uint8_t u8x8_gpio_and_delay_i2c_lcd_board(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, U8X8_UNUSED void *arg_ptr)
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{
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uint8_t i;
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switch(msg)
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{
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case U8X8_MSG_GPIO_RESET:
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u8x8_set_ctrl_bit(u8x8, I2C_LCD_RESET, arg_int);
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return 1;
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case U8X8_MSG_GPIO_AND_DELAY_INIT:
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u8x8->i2c_started = I2C_LCD_CS|I2C_LCD_RD|I2C_LCD_RESET|I2C_LCD_LED_DEFAULT; // reused i2c_started to store the gpio state
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u8x8_set_ctrl_bit(u8x8, 0, 1); // just transmit the control byte
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return 1;
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}
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return u8x8_gpio_and_delay_arduino(u8x8, msg, arg_int, arg_ptr);
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}
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/*
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This is an example byte level procedure for my T6963 board.
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Chips select and write strobe signals may differ.
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*/
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uint8_t u8x8_byte_i2c_lcd_board(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
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{
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/* usually only the following two varibables need to be modified */
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uint8_t write_strobe = I2C_LCD_RW; /* T6963 in 8080mode */
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uint8_t chip_select = I2C_LCD_CS;
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uint8_t *data;
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switch(msg)
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{
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case U8X8_MSG_BYTE_SEND:
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data = (uint8_t *)arg_ptr;
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while( arg_int > 0 )
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{
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Wire.beginTransmission(I2C_LCD_DATA_ADR);
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Wire.write(*data);
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Wire.endTransmission();
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data++;
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arg_int--;
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//u8x8_gpio_Delay(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->data_setup_time_ns);
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u8x8_set_ctrl_bit(u8x8, write_strobe, 0); // in 8080 mode, the RW signal is the /WR signal
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//u8x8_gpio_Delay(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->write_pulse_width_ns);
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u8x8_set_ctrl_bit(u8x8, write_strobe, 1); // in 8080 mode, the RW signal is the /WR signal
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}
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break;
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case U8X8_MSG_BYTE_INIT:
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Wire.begin();
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Wire.setClock(400000);
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/* disable chipselect */
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u8x8_set_ctrl_bit(u8x8, chip_select, u8x8->display_info->chip_disable_level); // disable display controller
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/* ensure that the enable signal is high */
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u8x8_set_ctrl_bit(u8x8, write_strobe, 1); // in 8080 mode, the RW signal is the /WR signal
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break;
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case U8X8_MSG_BYTE_SET_DC:
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u8x8_set_ctrl_bit(u8x8, I2C_LCD_CD, arg_int); // command/data data/command
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break;
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case U8X8_MSG_BYTE_START_TRANSFER:
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u8x8_set_ctrl_bit(u8x8, chip_select, u8x8->display_info->chip_enable_level); // command/data data/command
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u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->post_chip_enable_wait_ns, NULL);
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break;
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case U8X8_MSG_BYTE_END_TRANSFER:
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u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->pre_chip_disable_wait_ns, NULL);
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u8x8_set_ctrl_bit(u8x8, chip_select, u8x8->display_info->chip_disable_level); // command/data data/command
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break;
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default:
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return 0;
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}
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return 1;
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}
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U8G2 u8g2; // create a plain U8g2 object
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void setup(void) {
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/*
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Do a manual update of the plain U8g2 object with the C API for the display.
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Use a special byte function, which includes the support for the I2C GFX boad.
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*/
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u8g2_Setup_t6963_240x128_1(u8g2.getU8g2(), U8G2_R0, u8x8_byte_i2c_lcd_board, u8x8_gpio_and_delay_i2c_lcd_board);
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u8g2.begin();
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}
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uint8_t x = 0;
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long t = 0;
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long tt = 0;
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void loop(void) {
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t = millis();
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u8g2.firstPage();
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do {
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u8g2.setFont(u8g2_font_ncenB24_tr);
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u8g2.drawStr(x*2,32,"Hello World!");
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u8g2.drawStr(x*2,64,"U8g2");
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u8g2.setCursor(x*2, 96);
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u8g2.print(tt, DEC);
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} while ( u8g2.nextPage() );
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x++;
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x &= 15;
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tt = millis() - t;
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}
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