87 lines
2.6 KiB
Arduino
87 lines
2.6 KiB
Arduino
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/*
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MAX7219_U8g2.ino
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A special example for the MAX7219 based LED display matrix
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
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Copyright (c) 2016, 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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#ifdef U8X8_HAVE_HW_SPI
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#include <SPI.h>
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#endif
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#ifdef U8X8_HAVE_HW_I2C
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#include <Wire.h>
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#endif
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U8G2_MAX7219_32X8_F_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 11, /* data=*/ 12, /* cs=*/ 10, /* dc=*/ U8X8_PIN_NONE, /* reset=*/ U8X8_PIN_NONE);
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uint16_t pos;
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uint16_t len;
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char *str = " Hello from U8g2... Arduino monochrome graphics library ";
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void setup(void) {
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u8g2.begin();
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u8g2.setFont(u8g2_font_victoriabold8_8r); // choose a 8x8 u8g2 font
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pos = 0;
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len = strlen(str)*8;
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}
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#define BUF_LEN 12
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void draw_string_at_bitpos(const char *str, uint16_t bitpos)
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{
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char buf[BUF_LEN];
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uint16_t start = bitpos / 8;
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uint16_t i;
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for( i = 0; i < BUF_LEN-1; i++)
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{
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buf[i] = str[start+i];
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if ( str[start+i] == '\0' )
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break;
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}
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buf[BUF_LEN-1] = '\0';
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u8g2.drawStr( -(bitpos & 7), 7, buf); // write buffer
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}
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void loop(void) {
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u8g2.clearBuffer(); // clear the internal memory
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draw_string_at_bitpos(str, pos);
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u8g2.sendBuffer(); // transfer internal memory to the display
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pos++;
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if ( pos >= len )
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pos = 0;
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delay(50);
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}
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